Source Code Cross Referenced for StreamReadWrite.java in  » EJB-Server-resin-3.1.5 » quercus » com » caucho » quercus » resources » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » quercus » com.caucho.quercus.resources 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.quercus.resources;
031:
032:        import com.caucho.quercus.QuercusException;
033:        import com.caucho.quercus.env.Env;
034:        import com.caucho.quercus.env.EnvCleanup;
035:        import com.caucho.quercus.env.StringValue;
036:        import com.caucho.quercus.env.UnicodeValueImpl;
037:        import com.caucho.vfs.ReadStream;
038:        import com.caucho.vfs.WriteStream;
039:
040:        import java.io.IOException;
041:
042:        /**
043:         * Represents read/write stream
044:         */
045:        public class StreamReadWrite extends StreamResource implements 
046:                EnvCleanup {
047:            private Env _env;
048:            private ReadStream _is;
049:            private WriteStream _os;
050:
051:            public StreamReadWrite(Env env) {
052:                _env = env;
053:
054:                _env.addCleanup(this );
055:            }
056:
057:            public StreamReadWrite(Env env, ReadStream is, WriteStream os) {
058:                this (env);
059:
060:                init(is, os);
061:            }
062:
063:            protected void init(ReadStream is, WriteStream os) {
064:                _is = is;
065:                _os = os;
066:            }
067:
068:            /**
069:             * Reads the next byte, returning -1 on eof.
070:             */
071:            public int read() throws IOException {
072:                if (_is != null)
073:                    return _is.read();
074:                else
075:                    return -1;
076:            }
077:
078:            /**
079:             * Reads a buffer, returning -1 on eof.
080:             */
081:            public int read(byte[] buffer, int offset, int length)
082:                    throws IOException {
083:                if (_is != null)
084:                    return _is.read(buffer, offset, length);
085:                else
086:                    return -1;
087:            }
088:
089:            /**
090:             * Reads the optional linefeed character from a \r\n
091:             */
092:            public boolean readOptionalLinefeed() throws IOException {
093:                if (_is != null) {
094:                    int ch = _is.read();
095:
096:                    if (ch == '\n') {
097:                        return true;
098:                    } else {
099:                        _is.unread();
100:                        return false;
101:                    }
102:                } else
103:                    return false;
104:            }
105:
106:            /**
107:             * Reads a line from the buffer.
108:             */
109:            public StringValue readLine() throws IOException {
110:                if (_is != null)
111:                    return _env.createString(_is.readLineNoChop());
112:                else
113:                    return _env.createEmptyString();
114:            }
115:
116:            /**
117:             * Reads a line from the stream into a buffer.
118:             */
119:            public int readLine(char[] buffer) {
120:                try {
121:                    if (_is != null)
122:                        return _is.readLine(buffer, buffer.length, false);
123:                    else
124:                        return -1;
125:                } catch (IOException e) {
126:                    return -1;
127:                }
128:            }
129:
130:            /**
131:             * Writes to a buffer.
132:             */
133:            public int write(byte[] buffer, int offset, int length)
134:                    throws IOException {
135:                if (_os != null) {
136:                    _os.write(buffer, offset, length);
137:
138:                    return length;
139:                } else {
140:                    return -1;
141:                }
142:            }
143:
144:            /**
145:             * prints
146:             */
147:            public void print(char ch) throws IOException {
148:                print(String.valueOf(ch));
149:            }
150:
151:            /**
152:             * prints
153:             */
154:            public void print(String s) throws IOException {
155:                if (_os != null)
156:                    _os.print(s);
157:            }
158:
159:            /**
160:             * Returns true on the end of file.
161:             */
162:            public boolean isEOF() {
163:                return true;
164:            }
165:
166:            /**
167:             * Flushes the output
168:             */
169:            public void flush() {
170:                try {
171:                    if (_os != null)
172:                        _os.flush();
173:                } catch (IOException e) {
174:                    throw new QuercusException(e);
175:                }
176:            }
177:
178:            /**
179:             * Returns the current location in the file.
180:             */
181:            public long getPosition() {
182:                return 0;
183:            }
184:
185:            /**
186:             * Closes the stream for reading.
187:             */
188:            public void closeRead() {
189:                ReadStream is = _is;
190:                _is = null;
191:
192:                if (is != null)
193:                    is.close();
194:            }
195:
196:            /**
197:             * Closes the stream for writing
198:             */
199:            public void closeWrite() {
200:                WriteStream os = _os;
201:                _os = null;
202:
203:                try {
204:                    if (os != null)
205:                        os.close();
206:                } catch (IOException e) {
207:                }
208:            }
209:
210:            /**
211:             * Closes the stream.
212:             */
213:            public void close() {
214:                _env.removeCleanup(this );
215:
216:                cleanup();
217:            }
218:
219:            /**
220:             * Implements the EnvCleanup interface.
221:             */
222:            public void cleanup() {
223:                ReadStream is = _is;
224:                _is = null;
225:
226:                WriteStream os = _os;
227:                _os = null;
228:
229:                if (is != null)
230:                    is.close();
231:
232:                try {
233:                    if (os != null)
234:                        os.close();
235:                } catch (IOException e) {
236:                }
237:            }
238:
239:        }
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