/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 io.undertow.websockets.core.function;

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

/**
 * @author <a href="mailto:nmaurer@redhat.com">Norman Maurer</a>
 */
public class ChannelFunctionReadableByteChannel implements ReadableByteChannel {

    private final ChannelFunction[] functions;
    private final ReadableByteChannel channel;

    public ChannelFunctionReadableByteChannel(ReadableByteChannel channel, ChannelFunction... functions) {
        this.channel = channel;
        this.functions = functions;
    }

    @Override
    public int read(ByteBuffer dst) throws IOException {
        int pos = dst.position();
        int r = 0;
        try {
            r = channel.read(dst);
            return r;
        } finally {
            if (r > 0) {
                for (ChannelFunction func: functions) {
                    func.afterRead(dst, pos, r);
                }
            }
        }
    }

    @Override
    public boolean isOpen() {
        return channel.isOpen();
    }

    @Override
    public void close() throws IOException {
        channel.close();
    }
}
