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/*
 * JBoss, Home of Professional Open Source
 *
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.xnio.sasl;

import java.io.IOException;
import java.nio.ByteBuffer;
import org.xnio.Buffers;
import org.xnio.conduits.AbstractMessageSinkConduit;
import org.xnio.conduits.Conduits;
import org.xnio.conduits.MessageSinkConduit;

/**
 * @author David M. Lloyd
 */
public final class SaslUnwrappingConduit extends AbstractMessageSinkConduit implements MessageSinkConduit {
    private final SaslWrapper wrapper;
    private ByteBuffer buffer;

    public SaslUnwrappingConduit(final MessageSinkConduit next, final SaslWrapper wrapper) {
        super(next);
        this.wrapper = wrapper;
    }

    public boolean send(final ByteBuffer src) throws IOException {
        if (! doSend()) {
            return false;
        }
        ByteBuffer wrapped = ByteBuffer.wrap(wrapper.unwrap(src));
        if (! next.send(wrapped)) {
            buffer = wrapped;
        }
        return true;
    }

    public boolean send(final ByteBuffer[] srcs, final int offs, final int len) throws IOException {
        if (! doSend()) {
            return false;
        }
        final byte[] bytes = Buffers.take(srcs, offs, len);
        final ByteBuffer wrapped = ByteBuffer.wrap(wrapper.unwrap(bytes));
        if (! next.send(wrapped)) {
            this.buffer = wrapped;
        }
        return true;
    }

    @Override
    public boolean sendFinal(ByteBuffer src) throws IOException {
        return Conduits.sendFinalBasic(this, src);
    }

    @Override
    public boolean sendFinal(ByteBuffer[] srcs, int offs, int len) throws IOException {
        return Conduits.sendFinalBasic(this, srcs, offs, len);
    }

    private boolean doSend() throws IOException {
        final ByteBuffer buffer = this.buffer;
        if (buffer != null && next.send(buffer)) {
            this.buffer = null;
            return true;
        }
        return false;
    }

    public boolean flush() throws IOException {
        return doSend() && next.flush();
    }
}