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.util;
018
019import java.io.IOException;
020import java.io.InputStream;
021
022import org.apache.commons.vfs2.RandomAccessContent;
023
024/**
025 * A RandomAccessContent that provides end-of-stream monitoring.
026 */
027public class MonitorRandomAccessContent implements RandomAccessContent {
028    private final RandomAccessContent content;
029    private boolean finished;
030
031    public MonitorRandomAccessContent(final RandomAccessContent content) {
032        this.content = content;
033    }
034
035    /**
036     * Called after this stream is closed.
037     *
038     * @throws IOException if subclass throws it.
039     */
040    @SuppressWarnings("unused") // IOException is needed because subclasses may need to throw it
041    protected void onClose() throws IOException {
042    }
043
044    /**
045     * Closes this content.
046     *
047     * @throws IOException if an error occurs.
048     */
049    @Override
050    public void close() throws IOException {
051        if (finished) {
052            return;
053        }
054
055        // Close the output stream
056        IOException exc = null;
057        try {
058            content.close();
059        } catch (final IOException ioe) {
060            exc = ioe;
061        }
062
063        // Notify of end of output
064        exc = null;
065        try {
066            onClose();
067        } catch (final IOException ioe) {
068            exc = ioe;
069        }
070
071        finished = true;
072
073        if (exc != null) {
074            throw exc;
075        }
076    }
077
078    @Override
079    public long getFilePointer() throws IOException {
080        return content.getFilePointer();
081    }
082
083    @Override
084    public void seek(final long pos) throws IOException {
085        content.seek(pos);
086    }
087
088    @Override
089    public long length() throws IOException {
090        return content.length();
091    }
092
093    @Override
094    public void write(final int b) throws IOException {
095        content.write(b);
096    }
097
098    @Override
099    public void write(final byte[] b) throws IOException {
100        content.write(b);
101    }
102
103    @Override
104    public void write(final byte[] b, final int off, final int len) throws IOException {
105        content.write(b, off, len);
106    }
107
108    @Override
109    public void writeBoolean(final boolean v) throws IOException {
110        content.writeBoolean(v);
111    }
112
113    @Override
114    public void writeByte(final int v) throws IOException {
115        content.writeByte(v);
116    }
117
118    @Override
119    public void writeShort(final int v) throws IOException {
120        content.writeShort(v);
121    }
122
123    @Override
124    public void writeChar(final int v) throws IOException {
125        content.writeChar(v);
126    }
127
128    @Override
129    public void writeInt(final int v) throws IOException {
130        content.writeInt(v);
131    }
132
133    @Override
134    public void writeLong(final long v) throws IOException {
135        content.writeLong(v);
136    }
137
138    @Override
139    public void writeFloat(final float v) throws IOException {
140        content.writeFloat(v);
141    }
142
143    @Override
144    public void writeDouble(final double v) throws IOException {
145        content.writeDouble(v);
146    }
147
148    @Override
149    public void writeBytes(final String s) throws IOException {
150        content.writeBytes(s);
151    }
152
153    @Override
154    public void writeChars(final String s) throws IOException {
155        content.writeChars(s);
156    }
157
158    @Override
159    public void writeUTF(final String str) throws IOException {
160        content.writeUTF(str);
161    }
162
163    @Override
164    public void readFully(final byte[] b) throws IOException {
165        content.readFully(b);
166    }
167
168    @Override
169    public void readFully(final byte[] b, final int off, final int len) throws IOException {
170        content.readFully(b, off, len);
171    }
172
173    @Override
174    public int skipBytes(final int n) throws IOException {
175        return content.skipBytes(n);
176    }
177
178    @Override
179    public void setLength(final long newLength) throws IOException {
180        content.setLength(newLength);
181    }
182
183    @Override
184    public boolean readBoolean() throws IOException {
185        return content.readBoolean();
186    }
187
188    @Override
189    public byte readByte() throws IOException {
190        return content.readByte();
191    }
192
193    @Override
194    public int readUnsignedByte() throws IOException {
195        return content.readUnsignedByte();
196    }
197
198    @Override
199    public short readShort() throws IOException {
200        return content.readShort();
201    }
202
203    @Override
204    public int readUnsignedShort() throws IOException {
205        return content.readUnsignedShort();
206    }
207
208    @Override
209    public char readChar() throws IOException {
210        return content.readChar();
211    }
212
213    @Override
214    public int readInt() throws IOException {
215        return content.readInt();
216    }
217
218    @Override
219    public long readLong() throws IOException {
220        return content.readLong();
221    }
222
223    @Override
224    public float readFloat() throws IOException {
225        return content.readFloat();
226    }
227
228    @Override
229    public double readDouble() throws IOException {
230        return content.readDouble();
231    }
232
233    @Override
234    public String readLine() throws IOException {
235        return content.readLine();
236    }
237
238    @Override
239    public String readUTF() throws IOException {
240        return content.readUTF();
241    }
242
243    @Override
244    public InputStream getInputStream() throws IOException {
245        return content.getInputStream();
246    }
247
248}