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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2011-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
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package org.glassfish.grizzly.http.io;

import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.memory.HeapBuffer;
import org.glassfish.grizzly.memory.MemoryManager;

/**
 * {@link HeapBuffer} implementation, which might be reset to reference another
 * byte[] at any moment.
 * 
 * @author Alexey Stashok
 */
final class TemporaryHeapBuffer extends HeapBuffer {

    boolean isDisposed;
    
    /**
     * Reset the byte[] this Buffer wraps.
     */
    void reset(final byte[] heap, final int offset, final int len) {
        this.heap = heap;
        this.offset = offset;
        this.cap = len;
        this.lim = len;
        this.pos = 0;
        byteBuffer = null;
        isDisposed = false;
    }

    Buffer cloneContent() {
//        final byte[] clonedBytes = Arrays.copyOfRange(heap,
//                offset + pos, offset + lim);
        final int length = remaining();
        
        final Buffer buffer = MemoryManager.DEFAULT_MEMORY_MANAGER.allocate(length);
        buffer.allowBufferDispose(true);
        buffer.put(heap, offset + pos, length);
        buffer.flip();

        // reset the mutable buffer content with the cloned array
//        reset(clonedBytes, 0, clonedBytes.length);
        
        dispose();
        
        return buffer;
    }

    @Override
    public void dispose() {
        isDisposed = true;
        
        super.dispose();
    }
    
    boolean isDisposed() {
        return isDisposed;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof TemporaryHeapBuffer)) return false;
        if (!super.equals(o)) return false;

        TemporaryHeapBuffer that = (TemporaryHeapBuffer) o;

        return (isDisposed == that.isDisposed);

    }

    @Override
    public int hashCode() {
        int result = super.hashCode();
        result = 31 * result + (isDisposed ? 1 : 0);
        return result;
    }

    public void recycle() {
        reset(null, 0, 0);
    }
}