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Apache Commons VFS is a Virtual File System library.
There is a newer version: 2.9.0
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.vfs2.provider.ram;

import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.vfs2.FileSystemException;

/**
 * OutputStream to a RamFile.
 */
public class RamFileOutputStream extends OutputStream {

    /**
     * File.
     */
    protected RamFileObject file;

    /**
     * buffer.
     */
    protected byte[] buffer1 = new byte[1];

    /** File is open or closed */
    protected boolean closed = false;

    private IOException exception;

    /**
     * @param file The base file.
     */
    public RamFileOutputStream(final RamFileObject file) {
        super();
        this.file = file;
    }

    /*
     * (non-Javadoc)
     *
     * @see java.io.DataOutput#write(byte[], int, int)
     */
    @Override
    public void write(final byte[] b, final int off, final int len) throws IOException {
        final RamFileData data = this.file.getData();
        final int size = data.size();
        final int newSize = size + len;
        // Store the Exception in order to notify the client again on close()
        try {
            this.file.resize(newSize);
        } catch (final IOException e) {
            this.exception = e;
            throw e;
        }
        System.arraycopy(b, off, data.getContent(), size, len);
    }

    /*
     * (non-Javadoc)
     *
     * @see java.io.DataOutput#write(int)
     */
    @Override
    public void write(final int b) throws IOException {
        buffer1[0] = (byte) b;
        this.write(buffer1);
    }

    @Override
    public void flush() throws IOException {
    }

    @Override
    public void close() throws IOException {
        if (closed) {
            return;
        }
        // Notify on close that there was an IOException while writing
        if (exception != null) {
            throw exception;
        }
        try {
            this.closed = true;
            // Close the
            this.file.endOutput();
        } catch (final Exception e) {
            throw new FileSystemException(e);
        }
    }

}