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/*
 * 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 org.jboss.marshalling;

import java.io.EOFException;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.BufferOverflowException;
import java.nio.ByteBuffer;
import java.nio.ReadOnlyBufferException;

/**
 * An {@code OutputStream} implementing {@code ByteOutput} which writes to a {@code ByteBuffer}.
 */
public class ByteBufferOutput extends OutputStream implements ByteOutput {

    private static EOFException writePastEnd() {
        return new EOFException("Write past end of buffer");
    }

    private static IOException readOnlyBuffer() {
        return new IOException("Read only buffer");
    }

    private final ByteBuffer buffer;

    /**
     * Create a new instance.
     *
     * @param buffer the buffer to write to
     */
    public ByteBufferOutput(final ByteBuffer buffer) {
        this.buffer = buffer;
    }

    /** {@inheritDoc} */
    public void write(final int b) throws IOException {
        try {
            buffer.put((byte)b);
        } catch (BufferOverflowException e) {
            throw writePastEnd();
        } catch (ReadOnlyBufferException e) {
            throw readOnlyBuffer();
        }
    }

    /** {@inheritDoc} */
    public void write(final byte[] b) throws IOException {
        try {
            buffer.put(b);
        } catch (BufferOverflowException e) {
            throw writePastEnd();
        } catch (ReadOnlyBufferException e) {
            throw readOnlyBuffer();
        }
    }

    /** {@inheritDoc} */
    public void write(final byte[] b, final int off, final int len) throws IOException {
        try {
            buffer.put(b, off, len);
        } catch (BufferOverflowException e) {
            throw writePastEnd();
        } catch (ReadOnlyBufferException e) {
            throw readOnlyBuffer();
        }
    }

    /** {@inheritDoc} */
    public void close() throws IOException {
    }

    /** {@inheritDoc} */
    public void flush() throws IOException {
    }
}