Refactor memory management for schemas and constraints to improve API and allow for future improvements

examples/custom_schema.cpp

@@ -74,6 +74,7 @@ using std::endl;
 
 using valijson::Schema;
 using valijson::SchemaParser;
+using valijson::Subschema;
 using valijson::Validator;
 using valijson::ValidationResults;
 using valijson::adapters::RapidJsonAdapter;
@@ -90,49 +91,64 @@ void addPropertiesConstraint(Schema &schema)
 {
 
     PropertiesConstraint::PropertySchemaMap propertySchemaMap;
-    PropertiesConstraint::PropertySchemaMap patternPropertiesSchemaMap;
 
     {
-        // Create a child schema for the 'category' property that requires one
+        // Prepare an enum constraint requires a document to be equal to at
-        // of several possible values.
+        // least one of a set of possible values
-        Schema &propertySchema = propertySchemaMap["category"];
         EnumConstraint::Values enumConstraintValues;
         enumConstraintValues.push_back(new RapidJsonFrozenValue("album"));
         enumConstraintValues.push_back(new RapidJsonFrozenValue("book"));
         enumConstraintValues.push_back(new RapidJsonFrozenValue("other"));
         enumConstraintValues.push_back(new RapidJsonFrozenValue("video"));
-        propertySchema.addConstraint(new EnumConstraint(enumConstraintValues));
+
+        // Create a subschema, owned by the root schema, with a constraint
+        const Subschema *subschema = schema.createSubschema();
+        schema.addConstraintToSubschema(EnumConstraint(enumConstraintValues),
+                subschema);
+
+        // Include subschema in properties constraint
+        propertySchemaMap["category"] = subschema;
     }
 
     {
         // Create a child schema for the 'description' property that requires
         // a string, but does not enforce any length constraints.
-        Schema &propertySchema = propertySchemaMap["description"];
+        const Subschema *subschema = schema.createSubschema();
-        propertySchema.addConstraint(new TypeConstraint(TypeConstraint::kString));
+        schema.addConstraintToSubschema(TypeConstraint(TypeConstraint::kString),
+                subschema);
+
+        // Include subschema in properties constraint
+        propertySchemaMap["description"] = subschema;
     }
 
     {
         // Create a child schema for the 'price' property, that requires a
         // number with a value greater than zero.
-        Schema &propertySchema = propertySchemaMap["price"];
+        const Subschema *subschema = schema.createSubschema();
-        propertySchema.addConstraint(new MinimumConstraint(0.0, true));
+        schema.addConstraintToSubschema(MinimumConstraint(0.0, true), subschema);
-        propertySchema.addConstraint(new TypeConstraint(TypeConstraint::kNumber));
+        schema.addConstraintToSubschema(TypeConstraint(TypeConstraint::kNumber),
+                subschema);
+
+        // Include subschema in properties constraint
+        propertySchemaMap["price"] = subschema;
     }
 
     {
         // Create a child schema for the 'title' property that requires a string
         // that is between 1 and 200 characters in length.
-        Schema &propertySchema = propertySchemaMap["title"];
+        const Subschema *subschema = schema.createSubschema();
-        propertySchema.addConstraint(new MaxLengthConstraint(200));
+        schema.addConstraintToSubschema(MaxLengthConstraint(200), subschema);
-        propertySchema.addConstraint(new MinLengthConstraint(1));
+        schema.addConstraintToSubschema(MinLengthConstraint(1), subschema);
-        propertySchema.addConstraint(new TypeConstraint(TypeConstraint::kString));
+        schema.addConstraintToSubschema(TypeConstraint(TypeConstraint::kString),
+                subschema);
+
+        // Include subschema in properties constraint
+        propertySchemaMap["title"] = subschema;
     }
 
     // Add a PropertiesConstraint to the schema, with the properties defined
-    // above, no pattern properties, and with additional property schemas
+    // above, no pattern properties or additional property schemas
-    // prohibited.
+    schema.addConstraint(PropertiesConstraint(propertySchemaMap));
-    schema.addConstraint(new PropertiesConstraint(
-        propertySchemaMap, patternPropertiesSchemaMap));
 }
 
 void addRequiredConstraint(Schema &schema)
@@ -176,10 +192,10 @@ int main(int argc, char *argv[])
     addTypeConstraint(schema);
 
     // Perform validation
-    Validator validator(schema);
+    Validator validator;
     ValidationResults results;
     RapidJsonAdapter targetDocumentAdapter(targetDocument);
-    if (!validator.validate(targetDocumentAdapter, &results)) {
+    if (!validator.validate(schema, targetDocumentAdapter, &results)) {
         std::cerr << "Validation failed." << endl;
         ValidationResults::Error error;
         unsigned int errorNum = 1;

examples/external_schema.cpp

@@ -60,11 +60,10 @@ int main(int argc, char *argv[])
     }
 
     // Perform validation
-    Validator validator(schema);
+    Validator validator(Validator::kWeakTypes);
-    validator.setStrict(false);
     ValidationResults results;
     RapidJsonAdapter targetDocumentAdapter(targetDocument);
-    if (!validator.validate(targetDocumentAdapter, &results)) {
+    if (!validator.validate(schema, targetDocumentAdapter, &results)) {
         std::cerr << "Validation failed." << endl;
         ValidationResults::Error error;
         unsigned int errorNum = 1;

include/valijson/constraints/concrete_constraints.hpp

@@ -16,14 +16,14 @@
 #ifndef __VALIJSON_CONSTRAINTS_CONCRETE_CONSTRAINTS_HPP
 #define __VALIJSON_CONSTRAINTS_CONCRETE_CONSTRAINTS_HPP
 
+#include <boost/ptr_container/ptr_vector.hpp>
+#include <boost/variant.hpp>
+
 #include <limits>
+#include <map>
 #include <set>
 #include <string>
-
+#include <vector>
-#include <boost/ptr_container/ptr_map.hpp>
-#include <boost/ptr_container/ptr_vector.hpp>
-#include <boost/scoped_ptr.hpp>
-#include <boost/shared_ptr.hpp>
 
 #include <valijson/adapters/frozen_value.hpp>
 #include <valijson/constraints/basic_constraint.hpp>
@@ -44,7 +44,7 @@ namespace constraints {
  */
 struct AllOfConstraint: BasicConstraint<AllOfConstraint>
 {
-    typedef boost::ptr_vector<Schema> Schemas;
+    typedef std::vector<const Subschema *> Schemas;
 
     AllOfConstraint(const Schemas &schemas)
       : schemas(schemas) { }
@@ -62,7 +62,7 @@ struct AllOfConstraint: BasicConstraint<AllOfConstraint>
  */
 struct AnyOfConstraint: BasicConstraint<AnyOfConstraint>
 {
-    typedef boost::ptr_vector<Schema> Schemas;
+    typedef std::vector<const Subschema *> Schemas;
 
     AnyOfConstraint(const Schemas &schemas)
       : schemas(schemas) { }
@@ -84,7 +84,8 @@ struct DependenciesConstraint: BasicConstraint<DependenciesConstraint>
     typedef std::map<std::string, Dependencies> PropertyDependenciesMap;
 
     // A mapping from property names to dependent schemas
-    typedef boost::ptr_map<std::string, Schema> PropertyDependentSchemasMap;
+    typedef std::map<std::string, const Subschema *>
+            PropertyDependentSchemasMap;
 
     DependenciesConstraint(const PropertyDependenciesMap &dependencies,
                            const PropertyDependentSchemasMap &dependentSchemas)
@@ -117,7 +118,7 @@ struct EnumConstraint: BasicConstraint<EnumConstraint>
  */
 struct ItemsConstraint: BasicConstraint<ItemsConstraint>
 {
-    typedef boost::ptr_vector<Schema> Schemas;
+    typedef std::vector<const Subschema *> Schemas;
 
     /**
      * @brief  Construct a singular item constraint that allows no additional
@@ -125,8 +126,9 @@ struct ItemsConstraint: BasicConstraint<ItemsConstraint>
      *
      * @param  itemSchema
      */
-    ItemsConstraint(const Schema &itemSchema)
+    ItemsConstraint(const Subschema *itemSchema)
-      : itemSchema(new Schema(itemSchema)) { }
+      : itemSchema(itemSchema),
+        additionalItemsSchema(NULL) { }
 
     /**
      * @brief  Construct a singular item schema that allows additional items
@@ -134,10 +136,10 @@ struct ItemsConstraint: BasicConstraint<ItemsConstraint>
      * @param  itemSchema
      * @param  additionalItemsSchema
      */
-    ItemsConstraint(const Schema &itemSchema,
+    ItemsConstraint(const Subschema *itemSchema,
-                    const Schema &additionalItemsSchema)
+                    const Subschema *additionalItemsSchema)
-      : itemSchema(new Schema(itemSchema)),
+      : itemSchema(itemSchema),
-        additionalItemsSchema(new Schema(additionalItemsSchema)) { }
+        additionalItemsSchema(additionalItemsSchema) { }
 
     /**
      * @brief  Construct a plural items constraint that does not allow for
@@ -146,7 +148,9 @@ struct ItemsConstraint: BasicConstraint<ItemsConstraint>
      * @param  itemSchemas  collection of item schemas
      */
     ItemsConstraint(const Schemas &itemSchemas)
-      : itemSchemas(new Schemas(itemSchemas)) { }
+      : itemSchema(NULL),
+        itemSchemas(itemSchemas),
+        additionalItemsSchema(NULL) { }
 
     /**
      * @brief  Construct a plural items constraint that allows additional items
@@ -155,21 +159,22 @@ struct ItemsConstraint: BasicConstraint<ItemsConstraint>
      * @param  additionalItemsSchema
      */
     ItemsConstraint(const Schemas &itemSchemas,
-                    const Schema &additionalItemsSchema)
+                    const Subschema *additionalItemsSchema)
-      : itemSchemas(new Schemas(itemSchemas)),
+      : itemSchema(NULL),
-        additionalItemsSchema(new Schema(additionalItemsSchema)) { }
+        itemSchemas(itemSchemas),
+        additionalItemsSchema(additionalItemsSchema) { }
 
     /**
      * @brief  Copy constructor
      */
     ItemsConstraint(const ItemsConstraint &other)
-      : itemSchema(other.itemSchema ? new Schema(*other.itemSchema.get()) : NULL),
+      : itemSchema(other.itemSchema),
-        itemSchemas(other.itemSchemas ? new Schemas(*other.itemSchemas.get()) : NULL),
+        itemSchemas(other.itemSchemas),
-        additionalItemsSchema(other.additionalItemsSchema ? new Schema(*other.additionalItemsSchema.get()) : NULL) { }
+        additionalItemsSchema(other.additionalItemsSchema) { }
 
-    const boost::scoped_ptr<const Schema> itemSchema;
+    const Subschema* itemSchema;
-    const boost::scoped_ptr<const Schemas> itemSchemas;
+    const Schemas itemSchemas;
-    const boost::scoped_ptr<const Schema> additionalItemsSchema;
+    const Subschema* additionalItemsSchema;
 };
 
 /**
@@ -265,25 +270,17 @@ struct MinPropertiesConstraint: BasicConstraint<MinPropertiesConstraint>
 };
 
 /**
- * @brief  Represents a 'multipleOf' or 'divisibleBy' constraint for decimals
+ * @brief  Represents a 'multipleOf' or 'divisibleBy' constraint
  */
-struct MultipleOfDecimalConstraint: BasicConstraint<MultipleOfDecimalConstraint>
+struct MultipleOfConstraint: BasicConstraint<MultipleOfConstraint>
 {
-    MultipleOfDecimalConstraint(double multipleOf)
+    explicit MultipleOfConstraint(int64_t value)
-      : multipleOf(multipleOf) { }
+      : value(value) { }
 
-    const double multipleOf;
+    explicit MultipleOfConstraint(double value)
-};
+      : value(value) { }
 
-/**
+    const boost::variant<double, int64_t> value;
- * @brief  Represents a 'multipleOf' or 'divisibleBy' constraint for int64_t
- */
-struct MultipleOfIntegerConstraint: BasicConstraint<MultipleOfIntegerConstraint>
-{
-    MultipleOfIntegerConstraint(int64_t multipleOf)
-      : multipleOf(multipleOf) { }
-
-    const int64_t multipleOf;
 };
 
 /**
@@ -291,13 +288,13 @@ struct MultipleOfIntegerConstraint: BasicConstraint<MultipleOfIntegerConstraint>
  */
 struct NotConstraint: BasicConstraint<NotConstraint>
 {
-    NotConstraint(const Schema &schema)
+    NotConstraint(const Subschema *schema)
-      : schema(new Schema(schema)) { }
+      : schema(schema) { }
 
     NotConstraint(const NotConstraint &other)
-      : schema(other.schema ? new Schema(*other.schema) : NULL) { }
+      : schema(other.schema) { }
 
-    const boost::scoped_ptr<const Schema> schema;
+    const Subschema *schema;
 };
 
 /**
@@ -305,7 +302,7 @@ struct NotConstraint: BasicConstraint<NotConstraint>
  */
 struct OneOfConstraint: BasicConstraint<OneOfConstraint>
 {
-    typedef boost::ptr_vector<Schema> Schemas;
+    typedef std::vector<const Subschema *> Schemas;
 
     OneOfConstraint(const Schemas &schemas)
       : schemas(schemas) { }
@@ -331,29 +328,33 @@ struct PatternConstraint: BasicConstraint<PatternConstraint>
  */
 struct PropertiesConstraint: BasicConstraint<PropertiesConstraint> {
 
-    typedef boost::ptr_map<std::string, Schema> PropertySchemaMap;
+    typedef std::map<std::string, const Subschema *> PropertySchemaMap;
+
+    PropertiesConstraint(const PropertySchemaMap &properties)
+      : properties(properties),
+        additionalProperties(NULL) { }
 
     PropertiesConstraint(const PropertySchemaMap &properties,
                          const PropertySchemaMap &patternProperties)
       : properties(properties),
-        patternProperties(patternProperties) { }
+        patternProperties(patternProperties),
+        additionalProperties(NULL) { }
 
     PropertiesConstraint(const PropertySchemaMap &properties,
                          const PropertySchemaMap &patternProperties,
-                         const Schema &additionalProperties)
+                         const Subschema *additionalProperties)
       : properties(properties),
         patternProperties(patternProperties),
-        additionalProperties(new Schema(additionalProperties)) { }
+        additionalProperties(additionalProperties) { }
 
     PropertiesConstraint(const PropertiesConstraint &other)
       : properties(other.properties),
         patternProperties(other.patternProperties),
-        additionalProperties(other.additionalProperties ?
+        additionalProperties(other.additionalProperties) {}
-                 new Schema(*other.additionalProperties.get()) : NULL) {}
 
     const PropertySchemaMap properties;
     const PropertySchemaMap patternProperties;
-    const boost::scoped_ptr<const Schema> additionalProperties;
+    const Subschema *additionalProperties;
 
 };
 
@@ -391,15 +392,15 @@ struct TypeConstraint: BasicConstraint<TypeConstraint>
 
     typedef std::set<JsonType> JsonTypes;
 
-    typedef boost::ptr_vector<Schema> Schemas;
+    typedef std::vector<const Subschema *> Schemas;
 
     TypeConstraint(const JsonType jsonType)
       : jsonTypes(makeJsonTypes(jsonType)) { }
 
-    TypeConstraint(const JsonTypes jsonTypes)
+    TypeConstraint(const JsonTypes &jsonTypes)
       : jsonTypes(jsonTypes) { }
 
-    TypeConstraint(const JsonTypes jsonTypes,
+    TypeConstraint(const JsonTypes &jsonTypes,
                    const Schemas &schemas)
       : jsonTypes(jsonTypes),
         schemas(schemas) { }

include/valijson/constraints/constraint_visitor.hpp

@@ -19,8 +19,7 @@ struct MinimumConstraint;
 struct MinItemsConstraint;
 struct MinLengthConstraint;
 struct MinPropertiesConstraint;
-struct MultipleOfDecimalConstraint;
+struct MultipleOfConstraint;
-struct MultipleOfIntegerConstraint;
 struct NotConstraint;
 struct OneOfConstraint;
 struct PatternConstraint;
@@ -48,8 +47,7 @@ protected:
     typedef constraints::MinItemsConstraint MinItemsConstraint;
     typedef constraints::MinLengthConstraint MinLengthConstraint;
     typedef constraints::MinPropertiesConstraint MinPropertiesConstraint;
-    typedef constraints::MultipleOfDecimalConstraint MultipleOfDecimalConstraint;
+    typedef constraints::MultipleOfConstraint MultipleOfConstraint;
-    typedef constraints::MultipleOfIntegerConstraint MultipleOfIntegerConstraint;
     typedef constraints::NotConstraint NotConstraint;
     typedef constraints::OneOfConstraint OneOfConstraint;
     typedef constraints::PatternConstraint PatternConstraint;
@@ -73,8 +71,7 @@ public:
     virtual bool visit(const MinItemsConstraint &) = 0;
     virtual bool visit(const MinLengthConstraint &) = 0;
     virtual bool visit(const MinPropertiesConstraint &) = 0;
-    virtual bool visit(const MultipleOfDecimalConstraint &) = 0;
+    virtual bool visit(const MultipleOfConstraint &) = 0;
-    virtual bool visit(const MultipleOfIntegerConstraint &) = 0;
     virtual bool visit(const NotConstraint &) = 0;
     virtual bool visit(const OneOfConstraint &) = 0;
     virtual bool visit(const PatternConstraint &) = 0;

include/valijson/schema.hpp

@@ -21,7 +21,8 @@ public:
     /**
      * @brief  Construct a new Schema instance with no constraints
      */
-    Schema() {}
+    Schema()
+      : sharedEmptySubschema(newSubschema()) { }
 
     /**
      * @brief  Clean up and free all memory managed by the Schema
@@ -31,11 +32,14 @@ public:
      */
     virtual ~Schema()
     {
+        sharedEmptySubschema->~Subschema();
+        ::operator delete((void*)(sharedEmptySubschema));
+        sharedEmptySubschema = NULL;
+
         try {
-            while (!subschemaSet.empty()) {
+            for (std::set<Subschema *>::iterator itr = subschemaSet.begin();
-                std::set<Subschema*>::iterator itr = subschemaSet.begin();
+                    itr != subschemaSet.end(); ++itr) {
                 Subschema *subschema = *itr;
-                subschemaSet.erase(itr);
                 subschema->~Subschema();
                 // TODO: Replace with custom free function
                 ::operator delete(subschema);
@@ -60,20 +64,9 @@ public:
     void addConstraintToSubschema(const Constraint &constraint,
             const Subschema *subschema)
     {
-        if (subschema == this) {
-            addConstraint(constraint);
-            return;
-        }
-
-        Subschema *noConst = const_cast<Subschema*>(subschema);
-        if (subschemaSet.find(noConst) == subschemaSet.end()) {
-            throw std::runtime_error(
-                    "Subschema pointer is not owned by this Schema instance");
-        }
-
         // TODO: Check heirarchy for subschemas that do not belong...
 
-        noConst->addConstraint(constraint);
+        mutableSubschema(subschema)->addConstraint(constraint);
     }
 
     /**
@@ -83,25 +76,7 @@ public:
      */
     const Subschema * createSubschema()
     {
-        // TODO: Replace with custom malloc function
+        Subschema *subschema = newSubschema();
-        void *ptr = ::operator new(sizeof(Subschema));
-        if (!ptr) {
-            throw std::runtime_error(
-                    "Failed to allocate memory for sub-schema");
-        }
-
-        Subschema *subschema = NULL;
-        try {
-            subschema = new (ptr) Subschema();
-            if (!subschema) {
-                throw std::runtime_error("Failed to construct sub-schema");
-            }
-            ptr = NULL;
-        } catch (...) {
-            // TODO: Replace with custom free function
-            ::operator delete(ptr);
-            throw;
-        }
 
         try {
             if (!subschemaSet.insert(subschema).second) {
@@ -111,13 +86,21 @@ public:
         } catch (...) {
             subschema->~Subschema();
             // TODO: Replace with custom free function
-            ::operator delete(ptr);
+            ::operator delete(subschema);
             throw;
         }
 
         return subschema;
     }
 
+    /**
+     * @brief  Return a pointer to the shared empty schema
+     */
+    const Subschema * emptySubschema() const
+    {
+        return sharedEmptySubschema;
+    }
+
     /**
      * @brief  Get a pointer to the root sub-schema of this Schema instance
      */
@@ -126,10 +109,102 @@ public:
         return this;
     }
 
+    /**
+     * @brief  Update the description for one of the sub-schemas owned by this
+     *         Schema instance
+     *
+     * @param  subschema    sub-schema to update
+     * @param  description  new description
+     */
+    void setSubschemaDescription(const Subschema *subschema,
+            const std::string &description)
+    {
+        mutableSubschema(subschema)->setDescription(description);
+    }
+
+    /**
+     * @brief  Update the ID for one of the sub-schemas owned by this Schema
+     *         instance
+     *
+     * @param  subschema  sub-schema to update
+     * @param  id         new ID
+     */
+    void setSubschemaId(const Subschema *subschema, const std::string &id)
+    {
+        mutableSubschema(subschema)->setId(id);
+    }
+
+    /**
+     * @brief  Update the title for one of the sub-schemas owned by this Schema
+     *         instance
+     *
+     * @param  subschema  sub-schema to update
+     * @param  title      new title
+     */
+    void setSubschemaTitle(const Subschema *subschema, const std::string &title)
+    {
+        mutableSubschema(subschema)->setTitle(title);
+    }
+
 private:
 
+    // Disable copy construction
+    Schema(const Schema &);
+
+    // Disable copy assignment
+    Schema & operator=(const Schema &);
+
+    static Subschema *newSubschema()
+    {
+        // TODO: Replace with custom alloc function
+        void *ptr = ::operator new(sizeof(Subschema));
+        if (!ptr) {
+            throw std::runtime_error(
+                    "Failed to allocate memory for shared empty sub-schema");
+        }
+
+        Subschema *subschema = NULL;
+        try {
+            subschema = new (ptr) Subschema();
+            if (!subschema) {
+                throw std::runtime_error(
+                        "Failed to construct shared empty sub-schema");
+            }
+            ptr = NULL;
+        } catch (...) {
+            // TODO: Replace with custom free function
+            ::operator delete(ptr);
+            throw;
+        }
+
+        return subschema;
+    }
+
+    Subschema * mutableSubschema(const Subschema *subschema)
+    {
+        if (subschema == this) {
+            return this;
+        }
+
+        if (subschema == sharedEmptySubschema) {
+            throw std::runtime_error(
+                    "Cannot modify the shared empty sub-schema");
+        }
+
+        Subschema *noConst = const_cast<Subschema*>(subschema);
+        if (subschemaSet.find(noConst) == subschemaSet.end()) {
+            throw std::runtime_error(
+                    "Subschema pointer is not owned by this Schema instance");
+        }
+
+        return noConst;
+    }
+
     /// Set of Subschema instances owned by this schema
     std::set<Subschema*> subschemaSet;
+
+    /// Empty schema that can be reused by multiple constraints
+    const Subschema *sharedEmptySubschema;
 };
 
 } // namespace valijson

include/valijson/subschema.hpp

@@ -2,10 +2,11 @@
 #ifndef __VALIJSON_SUBSCHEMA_HPP
 #define __VALIJSON_SUBSCHEMA_HPP
 
+#include <vector>
+
 #include <boost/foreach.hpp>
 #include <boost/function.hpp>
 #include <boost/optional.hpp>
-#include <boost/ptr_container/ptr_vector.hpp>
 
 #include <valijson/constraints/constraint.hpp>
 
@@ -51,6 +52,24 @@ public:
       : constraints(subschema.constraints),
         title(subschema.title) { }
 
+    /**
+     * @brief  Clean up and free all memory managed by the Subschema
+     */
+    virtual ~Subschema()
+    {
+        try {
+            for (std::vector<const Constraint *>::iterator itr =
+                    constraints.begin(); itr != constraints.end(); ++itr) {
+                const Constraint *constraint = *itr;
+                delete constraint;
+            }
+            constraints.clear();
+        } catch (const std::exception &e) {
+            fprintf(stderr, "Caught an exception in Subschema destructor: %s",
+                    e.what());
+        }
+    }
+
     /**
      * @brief  Add a constraint to this sub-schema
      *
@@ -94,8 +113,8 @@ public:
     bool apply(ApplyFunction &applyFunction) const
     {
         bool allTrue = true;
-        BOOST_FOREACH( const Constraint &constraint, constraints ) {
+        BOOST_FOREACH( const Constraint *constraint, constraints ) {
-            allTrue = allTrue && applyFunction(constraint);
+            allTrue = allTrue && applyFunction(*constraint);
         }
 
         return allTrue;
@@ -113,8 +132,8 @@ public:
      */
     bool applyStrict(ApplyFunction &applyFunction) const
     {
-        BOOST_FOREACH( const Constraint &constraint, constraints ) {
+        BOOST_FOREACH( const Constraint *constraint, constraints ) {
-            if (!applyFunction(constraint)) {
+            if (!applyFunction(*constraint)) {
                 return false;
             }
         }
@@ -238,7 +257,7 @@ public:
 private:
 
     /// List of pointers to constraints that apply to this schema.
-    boost::ptr_vector<Constraint> constraints;
+    std::vector<const Constraint *> constraints;
 
     /// Schema description (optional)
     boost::optional<std::string> description;

include/valijson/validation_visitor.hpp

@@ -6,6 +6,7 @@
 
 #include <boost/lexical_cast.hpp>
 #include <boost/regex.hpp>
+#include <boost/variant/get.hpp>
 
 #include <valijson/constraints/concrete_constraints.hpp>
 #include <valijson/constraints/constraint_visitor.hpp>
@@ -64,18 +65,18 @@ public:
      *
      * @return  true if validation passes, false otherwise
      */
-    bool validateSchema(const Schema &schema)
+    bool validateSchema(const Subschema &subschema)
     {
         // Wrap the validationCallback() function below so that it will be
         // passed a reference to a constraint (_1), and a reference to the
         // visitor (*this).
-        Schema::ApplyFunction fn(boost::bind(validationCallback, _1, *this));
+        Subschema::ApplyFunction fn(boost::bind(validationCallback, _1, *this));
 
         // Perform validation against each constraint defined in the schema
         if (results == NULL) {
             // The applyStrict() function will return immediately if the
             // callback function returns false
-            if (!schema.applyStrict(fn)) {
+            if (!subschema.applyStrict(fn)) {
                 return false;
             }
         } else {
@@ -83,7 +84,7 @@ public:
             // schema, even if the callback function returns false. Once
             // iteration is complete, the apply() function will return true
             // only if all invokations of the callback function returned true.
-            if (!schema.apply(fn)) {
+            if (!subschema.apply(fn)) {
                 return false;
             }
         }
@@ -116,10 +117,10 @@ public:
 
         // Validate against each child schema
         unsigned int index = 0;
-        BOOST_FOREACH( const Schema &schema, constraint.schemas ) {
+        BOOST_FOREACH( const Subschema *subschema, constraint.schemas ) {
 
             // Ensure that the target validates against child schema
-            if (!validateSchema(schema)) {
+            if (!validateSchema(*subschema)) {
                 if (results) {
                     validated = false;
                     results->pushError(context,
@@ -161,8 +162,8 @@ public:
         // visitor (*this).
         Schema::ApplyFunction fn(boost::bind(validationCallback, _1, *this));
 
-        BOOST_FOREACH( const Schema &schema, constraint.schemas ) {
+        BOOST_FOREACH( const Subschema *subschema, constraint.schemas ) {
-            if (schema.apply(fn)) {
+            if (subschema->apply(fn)) {
                 return true;
             }
         }
@@ -231,8 +232,8 @@ public:
             // dependent schema.
             PDSM::const_iterator depSchemasItr = depSchemas.find(m.first);
             if (depSchemasItr != depSchemas.end()) {
-                const Schema *schema = depSchemasItr->second;
+                const Subschema *subschema = depSchemasItr->second;
-                if (!validateSchema(*schema)) {
+                if (!validateSchema(*subschema)) {
                     if (results) {
                         results->pushError(context, "Failed to validate against dependent schema.");
                         validated = false;
@@ -326,14 +327,14 @@ public:
                 ++index;
             }
 
-        } else if (constraint.itemSchemas) {
+        } else if (!constraint.itemSchemas.empty()) {
 
             // Get access to the target as an object
             const typename AdapterType::Array arr = target.asArray();
 
             if (!constraint.additionalItemsSchema) {
                 // Check that the array length is <= length of the itemsSchema list
-                if (arr.size() > constraint.itemSchemas->size()) {
+                if (arr.size() > constraint.itemSchemas.size()) {
                     if (results) {
                         results->pushError(context, "Array contains more items than allowed by items constraint.");
                         validated = false;
@@ -351,7 +352,7 @@ public:
                 newContext.push_back("[" + boost::lexical_cast<std::string>(index) + "]");
                 ValidationVisitor<AdapterType> v(arrayItem,
                     newContext, strictTypes, results);
-                if (index >= constraint.itemSchemas->size()) {
+                if (index >= constraint.itemSchemas.size()) {
                     if (constraint.additionalItemsSchema) {
                         if (!v.validateSchema(*constraint.additionalItemsSchema)) {
                             if (results) {
@@ -367,7 +368,7 @@ public:
                             boost::lexical_cast<std::string>(index) + " in array due to missing schema.");
                         validated = false;
                     }
-                } else if (!v.validateSchema(constraint.itemSchemas->at(index))) {
+                } else if (!v.validateSchema(*constraint.itemSchemas.at(index))) {
                     if (results) {
                         results->pushError(context, "Failed to validate item #" +
                             boost::lexical_cast<std::string>(index) + " against corresponding item schema.");
@@ -653,71 +654,17 @@ public:
 
     /**
      * @brief   Validate against the multipleOf or divisibleBy constraints
-     *          represented by a MultipleOfDecimalConstraint object.
+     *          represented by a MultipleOfConstraint object.
      *
      * @param   constraint  Constraint that the target must validate against.
      *
      * @return  true if the constraint is satisfied, false otherwise.
      */
-    virtual bool visit(const MultipleOfDecimalConstraint &constraint)
+    virtual bool visit(const MultipleOfConstraint &constraint)
     {
-        double d = 0.;
+        const int64_t *multipleOfInteger = boost::get<int64_t>(&constraint.value);
-
+        if (multipleOfInteger) {
-        if (target.maybeDouble()) {
-            if (!target.asDouble(d)) {
-                if (results) {
-                    results->pushError(context, "Value could not be converted "
-                        "to a number to check if it is a multiple of " +
-                        boost::lexical_cast<std::string>(
-                                constraint.multipleOf));
-                }
-                return false;
-            }
-        } else if (target.maybeInteger()) {
             int64_t i = 0;
-            if (!target.asInteger(i)) {
-                if (results) {
-                    results->pushError(context, "Value could not be converted "
-                        "to a number to check if it is a multiple of " +
-                        boost::lexical_cast<std::string>(
-                                constraint.multipleOf));
-                }
-                return false;
-            }
-            d = static_cast<double>(i);
-        } else {
-            return true;
-        }
-
-        if (d == 0) {
-            return true;
-        }
-
-        const double r = remainder(d, constraint.multipleOf);
-
-        if (fabs(r) > std::numeric_limits<double>::epsilon()) {
-            if (results) {
-                results->pushError(context, "Value should be a multiple of " +
-                    boost::lexical_cast<std::string>(constraint.multipleOf));
-            }
-            return false;
-        }
-
-        return true;
-    }
-
-    /**
-     * @brief   Validate against the multipleOf or divisibleBy constraints
-     *          represented by a MultipleOfIntegerConstraint object.
-     *
-     * @param   constraint  Constraint that the target must validate against.
-     *
-     * @return  true if the constraint is satisfied, false otherwise.
-     */
-    virtual bool visit(const MultipleOfIntegerConstraint &constraint)
-    {
-        int64_t i = 0;
-
             if (target.maybeInteger()) {
                 if (!target.asInteger(i)) {
                     if (results) {
@@ -744,10 +691,10 @@ public:
                 return true;
             }
 
-        if (i % constraint.multipleOf != 0) {
+            if (i % *multipleOfInteger != 0) {
                 if (results) {
                     results->pushError(context, "Value should be a multiple of " +
-                    boost::lexical_cast<std::string>(constraint.multipleOf));
+                        boost::lexical_cast<std::string>(*multipleOfInteger));
                 }
                 return false;
             }
@@ -755,6 +702,53 @@ public:
             return true;
         }
 
+        const double *multipleOfDouble = boost::get<double>(&constraint.value);
+        if (multipleOfDouble) {
+            double d = 0.;
+            if (target.maybeDouble()) {
+                if (!target.asDouble(d)) {
+                    if (results) {
+                        results->pushError(context, "Value could not be converted "
+                            "to a number to check if it is a multiple of " +
+                            boost::lexical_cast<std::string>(*multipleOfDouble));
+                    }
+                    return false;
+                }
+            } else if (target.maybeInteger()) {
+                int64_t i = 0;
+                if (!target.asInteger(i)) {
+                    if (results) {
+                        results->pushError(context, "Value could not be converted "
+                            "to a number to check if it is a multiple of " +
+                            boost::lexical_cast<std::string>(*multipleOfDouble));
+                    }
+                    return false;
+                }
+                d = static_cast<double>(i);
+            } else {
+                return true;
+            }
+
+            if (d == 0) {
+                return true;
+            }
+
+            const double r = remainder(d, *multipleOfDouble);
+
+            if (fabs(r) > std::numeric_limits<double>::epsilon()) {
+                if (results) {
+                    results->pushError(context, "Value should be a multiple of " +
+                        boost::lexical_cast<std::string>(*multipleOfDouble));
+                }
+                return false;
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
     /**
      * @brief   Validate against the not constraint represented by a
      *          NotConstraint object.
@@ -791,9 +785,9 @@ public:
         ValidationResults newResults;
         ValidationResults *childResults = (results) ? &newResults : NULL;
 
-        BOOST_FOREACH( const Schema &schema, constraint.schemas ) {
+        BOOST_FOREACH( const Subschema *subschema, constraint.schemas ) {
             ValidationVisitor<AdapterType> v(target, context, strictTypes, childResults);
-            if (v.validateSchema(schema)) {
+            if (v.validateSchema(*subschema)) {
                 numValidated++;
             }
         }
@@ -1033,8 +1027,8 @@ public:
             }
         }
 
-        BOOST_FOREACH( const Schema &schema, constraint.schemas ) {
+        BOOST_FOREACH( const Subschema *subschema, constraint.schemas ) {
-            if (validateSchema(schema)) {
+            if (validateSchema(*subschema)) {
                 return true;
             }
         }

include/valijson/validator.hpp

@@ -14,38 +14,30 @@ class Schema;
 class ValidationResults;
 
 /**
- * @brief  Class that wraps a schema and provides validation functionality.
+ * @brief  Class that provides validation functionality.
- *
- * This class wraps a Schema object, and encapsulates the logic required to
- * validate rapidjson values aginst the schema.
  */
 class Validator
 {
 public:
-
+    enum TypeCheckingMode
-    /**
-     * @brief  Construct a validator using the specified schema.
-     *
-     * The schema that is provided will be copied.
-     *
-     * @param  schema       A schema to use for validation
-     */
-    Validator(const Schema &schema)
-      : schema(new Schema(schema)),
-        strictTypes(true) { }
-
-    /**
-     * @brief  Set flag to use strict comparison during validation.
-     *
-     * The default value is true, but this can be changed at any time. Future
-     * invokations of validate() will make use of the new value.
-     *
-     * @param  strictTypes  whether or not to use strict comparison
-     */
-    void setStrict(bool strictTypes)
     {
-        this->strictTypes = strictTypes;
+        kStrongTypes,
-    }
+        kWeakTypes
+    };
+
+    /**
+     * @brief  Construct a Validator that uses strong type checking by default
+     */
+    Validator()
+      : strictTypes(true) { }
+
+    /**
+     * @brief  Construct a Validator using a specific type checking mode
+     *
+     * @param  typeCheckingMode  choice of strong or weak type checking
+     */
+    Validator(TypeCheckingMode typeCheckingMode)
+      : strictTypes(typeCheckingMode == kStrongTypes) { }
 
     /**
      * @brief  Validate a JSON document and optionally return the results.
@@ -58,30 +50,29 @@ public:
      * will only continue for as long as the constraints are validated
      * successfully.
      *
-     * @param  target   A rapidjson::Value to be validated.
+     * @param  schema   The schema to validate against
+     * @param  target   A rapidjson::Value to be validated
      *
      * @param  results  An optional pointer to a ValidationResults instance that
-     *                  will be used to report validation errors.
+     *                  will be used to report validation errors
      *
-     * @returns  true if validation succeeds, false otherwise.
+     * @returns  true if validation succeeds, false otherwise
      */
     template<typename AdapterType>
-    bool validate(const AdapterType &target, ValidationResults *results)
+    bool validate(const Subschema &schema, const AdapterType &target,
+            ValidationResults *results)
     {
         // Construct a ValidationVisitor to perform validation at the root level
-        ValidationVisitor<AdapterType> v(target, std::vector<std::string>(1, "<root>"),
+        ValidationVisitor<AdapterType> v(target,
-            strictTypes, results);
+                std::vector<std::string>(1, "<root>"), strictTypes, results);
 
-        return v.validateSchema(*schema);
+        return v.validateSchema(schema);
     }
 
 private:
 
-    /// Pointer to an internal copy of a schema to use for validation
-    boost::scoped_ptr<const Schema> schema;
-
     /// Flag indicating that strict type comparisons should be used
-    bool strictTypes;
+    const bool strictTypes;
 
 };
 

tests/test_fetch_document_callback.cpp

@@ -70,12 +70,12 @@ TEST_F(TestFetchDocumentCallback, Basics)
     rapidjson::Document validDocument;
     validDocument.SetObject();
     validDocument.AddMember("test", "valid", allocator);
-    Validator validator(schema);
+    Validator validator;
-    EXPECT_TRUE(validator.validate(RapidJsonAdapter(validDocument), NULL));
+    EXPECT_TRUE(validator.validate(schema, RapidJsonAdapter(validDocument), NULL));
 
     // Test resulting schema with an invalid document
     rapidjson::Document invalidDocument;
     invalidDocument.SetObject();
     invalidDocument.AddMember("test", 123, allocator);
-    EXPECT_FALSE(validator.validate(RapidJsonAdapter(invalidDocument), NULL));
+    EXPECT_FALSE(validator.validate(schema, RapidJsonAdapter(invalidDocument), NULL));
 }

tests/test_validation_errors.cpp

@@ -46,9 +46,9 @@ TEST_F(TestValidationErrors, AllOfConstraintFailure)
     ASSERT_TRUE( loadDocument(TEST_DATA_DIR "/documents/array_doubles_1_2_3.json", testDocument) );
     RapidJsonAdapter testAdapter(testDocument);
 
-    Validator validator(schema);
+    Validator validator;
     ValidationResults results;
-    EXPECT_FALSE( validator.validate(testAdapter, &results) );
+    EXPECT_FALSE( validator.validate(schema, testAdapter, &results) );
 
     ValidationResults::Error error;
 

tests/test_validator.cpp

@@ -96,10 +96,10 @@ protected:
 
                     testItr = testObject.find("data");
                     ASSERT_NE( testObject.end(), testItr );
-                    Validator validator(schema);
+                    Validator validator(strict ?
-                    validator.setStrict(strict);
+                            Validator::kStrongTypes : Validator::kWeakTypes);
 
-                    EXPECT_EQ( shouldValidate, validator.validate(testItr->second, NULL) )
+                    EXPECT_EQ( shouldValidate, validator.validate(schema, testItr->second, NULL) )
                         << "Failed while testing validate() function in '"
                         << currentTest << "' of test case '"
                         << currentTestCase << "' with adapter '"