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/*
 * Copyright 2012 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 io.netty.util.internal.PlatformDependent;

/**
 * Simplistic {@link ByteBufAllocator} implementation that does not pool anything.
 */
public final class UnpooledByteBufAllocator extends AbstractByteBufAllocator {

    private final boolean disableLeakDetector;

    /**
     * Default instance which uses leak-detection for direct buffers.
     */
    public static final UnpooledByteBufAllocator DEFAULT =
            new UnpooledByteBufAllocator(PlatformDependent.directBufferPreferred());

    /**
     * Create a new instance which uses leak-detection for direct buffers.
     *
     * @param preferDirect {@code true} if {@link #buffer(int)} should try to allocate a direct buffer rather than
     *                     a heap buffer
     */
    public UnpooledByteBufAllocator(boolean preferDirect) {
        this(preferDirect, false);
    }

    /**
     * Create a new instance
     *
     * @param preferDirect {@code true} if {@link #buffer(int)} should try to allocate a direct buffer rather than
     *                     a heap buffer
     * @param disableLeakDetector {@code true} if the leak-detection should be disabled completely for this
     *                            allocator. This can be useful if the user just want to depend on the GC to handle
     *                            direct buffers when not explicit released.
     */
    public UnpooledByteBufAllocator(boolean preferDirect, boolean disableLeakDetector) {
        super(preferDirect);
        this.disableLeakDetector = disableLeakDetector;
    }

    @Override
    protected ByteBuf newHeapBuffer(int initialCapacity, int maxCapacity) {
        return PlatformDependent.hasUnsafe() ? new UnpooledUnsafeHeapByteBuf(this, initialCapacity, maxCapacity)
                : new UnpooledHeapByteBuf(this, initialCapacity, maxCapacity);
    }

    @Override
    protected ByteBuf newDirectBuffer(int initialCapacity, int maxCapacity) {
        ByteBuf buf = PlatformDependent.hasUnsafe() ?
                UnsafeByteBufUtil.newUnsafeDirectByteBuf(this, initialCapacity, maxCapacity) :
                new UnpooledDirectByteBuf(this, initialCapacity, maxCapacity);

        return disableLeakDetector ? buf : toLeakAwareBuffer(buf);
    }

    @Override
    public CompositeByteBuf compositeHeapBuffer(int maxNumComponents) {
        CompositeByteBuf buf = new CompositeByteBuf(this, false, maxNumComponents);
        return disableLeakDetector ? buf : toLeakAwareBuffer(buf);
    }

    @Override
    public CompositeByteBuf compositeDirectBuffer(int maxNumComponents) {
        CompositeByteBuf buf = new CompositeByteBuf(this, true, maxNumComponents);
        return disableLeakDetector ? buf : toLeakAwareBuffer(buf);
    }

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