java: adds DefaultTemplate

java/src/main/java/org/msgpack/template/DefaultTemplate.java

@@ -0,0 +1,93 @@
+//
+// MessagePack for Java
+//
+// Copyright (C) 2009-2010 FURUHASHI Sadayuki
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+package org.msgpack.template;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+import org.msgpack.*;
+
+public class DefaultTemplate implements Template {
+	private Class<?> targetClass;
+	private Type lookupType;
+	private boolean messagePackable;
+	private boolean messageUnpackable;
+	private boolean messageConvertable;
+
+	public DefaultTemplate(Class<?> targetClass) {
+		this(targetClass, (Type)targetClass);
+	}
+
+	public DefaultTemplate(Class<?> targetClass, Type lookupType) {
+		this.targetClass = targetClass;
+		this.lookupType = lookupType;
+		this.messagePackable = MessagePackable.class.isAssignableFrom(targetClass);
+		this.messageUnpackable = MessageUnpackable.class.isAssignableFrom(targetClass);
+		this.messageConvertable = MessageConvertable.class.isAssignableFrom(targetClass);
+	}
+
+	public void pack(Packer pk, Object target) throws IOException {
+		if(messagePackable) {
+			((MessagePackable)target).messagePack(pk);
+			return;
+		}
+		Template tmpl = TemplateRegistry.tryLookup(lookupType);
+		if(tmpl == this || tmpl == null) {
+			throw new MessageTypeException();
+		}
+		tmpl.pack(pk, target);
+	}
+
+	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {
+		if(messageUnpackable) {
+			if(to == null) {
+				try {
+					to = targetClass.newInstance();
+				} catch (Exception e) {
+					throw new MessageTypeException(e);
+				}
+			}
+			((MessageUnpackable)to).messageUnpack(pac);
+			return to;
+		}
+		Template tmpl = TemplateRegistry.tryLookup(lookupType);
+		if(tmpl == this || tmpl == null) {
+			throw new MessageTypeException();
+		}
+		return tmpl.unpack(pac, to);
+	}
+
+	public Object convert(MessagePackObject from, Object to) throws MessageTypeException {
+		if(messageConvertable) {
+			if(to == null) {
+				try {
+					to = targetClass.newInstance();
+				} catch (Exception e) {
+					throw new MessageTypeException(e);
+				}
+			}
+			((MessageConvertable)to).messageConvert(from);
+			return from;
+		}
+		Template tmpl = TemplateRegistry.tryLookup(lookupType);
+		if(tmpl == this || tmpl == null) {
+			throw new MessageTypeException();
+		}
+		return tmpl.convert(from, to);
+	}
+}
+