001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.vfs2.provider.ram;
018
019import java.io.IOException;
020import java.io.OutputStream;
021
022/**
023 * OutputStream to a RamFile.
024 */
025public class RamFileOutputStream extends OutputStream {
026
027    /**
028     * File.
029     */
030    protected RamFileObject file;
031
032    /**
033     * buffer.
034     */
035    protected byte[] buffer1 = new byte[1];
036
037    /** File is open or closed */
038    protected boolean closed;
039
040    private IOException exception;
041
042    /**
043     * Constructs a new instance.
044     *
045     * @param file The base file.
046     */
047    public RamFileOutputStream(final RamFileObject file) {
048        this.file = file;
049    }
050
051    @Override
052    public void close() throws IOException {
053        if (closed) {
054            return;
055        }
056        // Notify on close that there was an IOException while writing
057        if (exception != null) {
058            throw exception;
059        }
060        closed = true;
061    }
062
063    @Override
064    public void flush() throws IOException {
065    }
066
067    /*
068     * (non-Javadoc)
069     *
070     * @see java.io.DataOutput#write(byte[], int, int)
071     */
072    @Override
073    public void write(final byte[] b, final int off, final int len) throws IOException {
074        final RamFileData data = file.getData();
075        final int size = data.size();
076        final int newSize = size + len;
077        // Store the Exception in order to notify the client again on close()
078        try {
079            file.resize(newSize);
080        } catch (final IOException e) {
081            exception = e;
082            throw e;
083        }
084        System.arraycopy(b, off, data.getContent(), size, len);
085    }
086
087    /*
088     * (non-Javadoc)
089     *
090     * @see java.io.DataOutput#write(int)
091     */
092    @Override
093    public void write(final int b) throws IOException {
094        buffer1[0] = (byte) b;
095        this.write(buffer1);
096    }
097
098}