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Java example source code file (UnreleasableByteBuf.java)

This example Java source code file (UnreleasableByteBuf.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytebuf, nio, nullpointerexception, override, swappedbytebuf, unreleasablebytebuf, wrappedbytebuf

The UnreleasableByteBuf.java Java example source code

/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.buffer;

import java.nio.ByteOrder;

/**
 * A {@link ByteBuf} implementation that wraps another buffer to prevent a user from increasing or decreasing the
 * wrapped buffer's reference count.
 */
final class UnreleasableByteBuf extends WrappedByteBuf {

    private SwappedByteBuf swappedBuf;

    UnreleasableByteBuf(ByteBuf buf) {
        super(buf);
    }

    @Override
    public ByteBuf order(ByteOrder endianness) {
        if (endianness == null) {
            throw new NullPointerException("endianness");
        }
        if (endianness == order()) {
            return this;
        }

        SwappedByteBuf swappedBuf = this.swappedBuf;
        if (swappedBuf == null) {
            this.swappedBuf = swappedBuf = new SwappedByteBuf(this);
        }
        return swappedBuf;
    }

    @Override
    public ByteBuf asReadOnly() {
        return new UnreleasableByteBuf(buf.asReadOnly());
    }

    @Override
    public ByteBuf readSlice(int length) {
        return new UnreleasableByteBuf(buf.readSlice(length));
    }

    @Override
    public ByteBuf readRetainedSlice(int length) {
        return new UnreleasableByteBuf(buf.readRetainedSlice(length));
    }

    @Override
    public ByteBuf slice() {
        return new UnreleasableByteBuf(buf.slice());
    }

    @Override
    public ByteBuf retainedSlice() {
        return new UnreleasableByteBuf(buf.retainedSlice());
    }

    @Override
    public ByteBuf slice(int index, int length) {
        return new UnreleasableByteBuf(buf.slice(index, length));
    }

    @Override
    public ByteBuf retainedSlice(int index, int length) {
        return new UnreleasableByteBuf(buf.retainedSlice(index, length));
    }

    @Override
    public ByteBuf duplicate() {
        return new UnreleasableByteBuf(buf.duplicate());
    }

    @Override
    public ByteBuf retainedDuplicate() {
        return new UnreleasableByteBuf(buf.retainedDuplicate());
    }

    @Override
    public ByteBuf retain(int increment) {
        return this;
    }

    @Override
    public ByteBuf retain() {
        return this;
    }

    @Override
    public ByteBuf touch() {
        return this;
    }

    @Override
    public ByteBuf touch(Object hint) {
        return this;
    }

    @Override
    public boolean release() {
        return false;
    }

    @Override
    public boolean release(int decrement) {
        return false;
    }
}

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