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Paint Upload is an asynchronous file upload library for servlets.

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/*
 * Copyright (C) 2015 Adam Forgacs
 *
 * 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 com.elopteryx.paint.upload.internal;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;

/**
 * A channel implementation which discards the data supplied.
 * Used by the parser if it doesn't have a channel to write to.
 * The purpose of this is to make the {@link com.elopteryx.paint.upload.OnPartBegin} callback
 * optional, which is useful for testing.
 */
public class NullChannel implements WritableByteChannel {

    /**
     * Flag to determine whether the channel is closed or not.
     */
    private boolean open = true;

    @Override
    public int write(ByteBuffer src) throws IOException {
        int dataCount = src.remaining();
        byte[] buf = new byte[dataCount];
        src.get(buf, 0, dataCount);
        return dataCount;
    }

    @Override
    public boolean isOpen() {
        return open;
    }

    @Override
    public void close() throws IOException {
        open = false;
    }
}