package org.atriasoft.pngencoder;

import java.util.LinkedList;
import java.util.Queue;

class PngEncoderDeflaterBufferPool {
	private final int bufferMaxLength;
	protected final Queue<PngEncoderDeflaterBuffer> buffers;
	
	PngEncoderDeflaterBufferPool(final int bufferMaxLength) {
		this.bufferMaxLength = bufferMaxLength;
		this.buffers = new LinkedList<>();
	}
	
	PngEncoderDeflaterBuffer borrow() {
		PngEncoderDeflaterBuffer buffer = this.buffers.poll();
		if (buffer == null) {
			buffer = new PngEncoderDeflaterBuffer(this, this.bufferMaxLength);
		}
		return buffer;
	}
	
	public int getBufferMaxLength() {
		return this.bufferMaxLength;
	}
	
	void giveBack(final PngEncoderDeflaterBuffer buffer) {
		buffer.length = 0;
		this.buffers.offer(buffer);
	}
	
	int size() {
		return this.buffers.size();
	}
}