Source Code Cross Referenced for OSFileSystem.java in  » Apache-Harmony-Java-SE » org-package » org » apache » harmony » luni » platform » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » org package » org.apache.harmony.luni.platform 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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:         */
017:
018:        package org.apache.harmony.luni.platform;
019:
020:        import java.io.FileDescriptor;
021:        import java.io.FileNotFoundException;
022:        import java.io.IOException;
023:
024:        /**
025:         * This is the portable implementation of the file system interface.
026:         * 
027:         */
028:        class OSFileSystem extends OSComponent implements  IFileSystem {
029:
030:            /**
031:             * 
032:             */
033:            public OSFileSystem() {
034:                super ();
035:            }
036:
037:            private final void validateLockArgs(int type, long start,
038:                    long length) {
039:                if ((type != IFileSystem.SHARED_LOCK_TYPE)
040:                        && (type != IFileSystem.EXCLUSIVE_LOCK_TYPE)) {
041:                    throw new IllegalArgumentException(
042:                            "Illegal lock type requested."); //$NON-NLS-1$
043:                }
044:
045:                // Start position
046:                if (start < 0) {
047:                    throw new IllegalArgumentException(
048:                            "Lock start position must be non-negative"); //$NON-NLS-1$
049:                }
050:
051:                // Length of lock stretch
052:                if (length < 0) {
053:                    throw new IllegalArgumentException(
054:                            "Lock length must be non-negative"); //$NON-NLS-1$
055:                }
056:            }
057:
058:            private native int lockImpl(long fileDescriptor, long start,
059:                    long length, int type, boolean wait);
060:
061:            /**
062:             * Returns the granularity for virtual memory allocation.
063:             * Note that this value for Windows differs from the one for the
064:             * page size (64K and 4K respectively).
065:             */
066:            public native int getAllocGranularity() throws IOException;
067:
068:            public boolean lock(long fileDescriptor, long start, long length,
069:                    int type, boolean waitFlag) throws IOException {
070:                // Validate arguments
071:                validateLockArgs(type, start, length);
072:                int result = lockImpl(fileDescriptor, start, length, type,
073:                        waitFlag);
074:                return result != -1;
075:            }
076:
077:            private native int unlockImpl(long fileDescriptor, long start,
078:                    long length);
079:
080:            public void unlock(long fileDescriptor, long start, long length)
081:                    throws IOException {
082:                // Validate arguments
083:                validateLockArgs(IFileSystem.SHARED_LOCK_TYPE, start, length);
084:                int result = unlockImpl(fileDescriptor, start, length);
085:                if (result == -1) {
086:                    throw new IOException();
087:                }
088:            }
089:
090:            private native int fflushImpl(long fd, boolean metadata);
091:
092:            public void fflush(long fileDescriptor, boolean metadata)
093:                    throws IOException {
094:                int result = fflushImpl(fileDescriptor, metadata);
095:                if (result == -1) {
096:                    throw new IOException();
097:                }
098:            }
099:
100:            /*
101:             * File position seeking.
102:             */
103:
104:            private native long seekImpl(long fd, long offset, int whence);
105:
106:            public long seek(long fileDescriptor, long offset, int whence)
107:                    throws IOException {
108:                long pos = seekImpl(fileDescriptor, offset, whence);
109:                if (pos == -1) {
110:                    throw new IOException();
111:                }
112:                return pos;
113:            }
114:
115:            /*
116:             * Direct read/write APIs work on addresses.
117:             */
118:            private native long readDirectImpl(long fileDescriptor,
119:                    long address, int offset, int length);
120:
121:            public long readDirect(long fileDescriptor, long address,
122:                    int offset, int length) throws IOException {
123:                long bytesRead = readDirectImpl(fileDescriptor, address,
124:                        offset, length);
125:                if (bytesRead < -1) {
126:                    throw new IOException();
127:                }
128:                return bytesRead;
129:            }
130:
131:            private native long writeDirectImpl(long fileDescriptor,
132:                    long address, int offset, int length);
133:
134:            public long writeDirect(long fileDescriptor, long address,
135:                    int offset, int length) throws IOException {
136:                long bytesWritten = writeDirectImpl(fileDescriptor, address,
137:                        offset, length);
138:                if (bytesWritten < 0) {
139:                    throw new IOException();
140:                }
141:                return bytesWritten;
142:            }
143:
144:            /*
145:             * Indirect read/writes work on byte[]'s
146:             */
147:            private native long readImpl(long fileDescriptor, byte[] bytes,
148:                    int offset, int length);
149:
150:            public long read(long fileDescriptor, byte[] bytes, int offset,
151:                    int length) throws IOException {
152:                if (bytes == null) {
153:                    throw new NullPointerException();
154:                }
155:                long bytesRead = readImpl(fileDescriptor, bytes, offset, length);
156:                if (bytesRead < -1) {
157:                    /*
158:                     * TODO: bytesRead is never less than -1 so this code
159:                     * does nothing?
160:                     * The native code throws an exception in only one case
161:                     * so perhaps this should be 'bytesRead < 0' to handle
162:                     * any other cases.  But the other cases have been
163:                     * ignored until now so fixing this could break things
164:                     */
165:                    throw new IOException();
166:                }
167:                return bytesRead;
168:            }
169:
170:            private native long writeImpl(long fileDescriptor, byte[] bytes,
171:                    int offset, int length);
172:
173:            public long write(long fileDescriptor, byte[] bytes, int offset,
174:                    int length) throws IOException {
175:                long bytesWritten = writeImpl(fileDescriptor, bytes, offset,
176:                        length);
177:                if (bytesWritten < 0) {
178:                    throw new IOException();
179:                }
180:                return bytesWritten;
181:            }
182:
183:            /*
184:             * Scatter/gather calls.
185:             */
186:            public long readv(long fileDescriptor, long[] addresses,
187:                    int[] offsets, int[] lengths, int size) throws IOException {
188:                long bytesRead = readvImpl(fileDescriptor, addresses, offsets,
189:                        lengths, size);
190:                if (bytesRead < -1) {
191:                    throw new IOException();
192:                }
193:                return bytesRead;
194:            }
195:
196:            private native long readvImpl(long fileDescriptor,
197:                    long[] addresses, int[] offsets, int[] lengths, int size);
198:
199:            public long writev(long fileDescriptor, long[] addresses,
200:                    int[] offsets, int[] lengths, int size) throws IOException {
201:                long bytesWritten = writevImpl(fileDescriptor, addresses,
202:                        offsets, lengths, size);
203:                if (bytesWritten < 0) {
204:                    throw new IOException();
205:                }
206:                return bytesWritten;
207:            }
208:
209:            private native long writevImpl(long fileDescriptor,
210:                    long[] addresses, int[] offsets, int[] lengths, int size);
211:
212:            private native int closeImpl(long fileDescriptor);
213:
214:            /*
215:             * (non-Javadoc)
216:             * 
217:             * @see org.apache.harmony.luni.platform.IFileSystem#close(long)
218:             */
219:            public void close(long fileDescriptor) throws IOException {
220:                int rc = closeImpl(fileDescriptor);
221:                if (rc == -1) {
222:                    throw new IOException();
223:                }
224:            }
225:
226:            public void truncate(long fileDescriptor, long size)
227:                    throws IOException {
228:                int rc = truncateImpl(fileDescriptor, size);
229:                if (rc < 0) {
230:                    throw new IOException();
231:                }
232:            }
233:
234:            private native int truncateImpl(long fileDescriptor, long size);
235:
236:            public long open(byte[] fileName, int mode)
237:                    throws FileNotFoundException {
238:                if (fileName == null) {
239:                    throw new NullPointerException();
240:                }
241:                long handler = openImpl(fileName, mode);
242:                if (handler < 0) {
243:                    throw new FileNotFoundException(new String(fileName));
244:                }
245:                return handler;
246:            }
247:
248:            private native long openImpl(byte[] fileName, int mode);
249:
250:            public long transfer(long fileHandler,
251:                    FileDescriptor socketDescriptor, long offset, long count)
252:                    throws IOException {
253:                long result = transferImpl(fileHandler, socketDescriptor,
254:                        offset, count);
255:                if (result < 0)
256:                    throw new IOException();
257:                return result;
258:            }
259:
260:            private native long transferImpl(long fileHandler,
261:                    FileDescriptor socketDescriptor, long offset, long count);
262:
263:            public long ttyAvailable() throws IOException {
264:                long nChar = ttyAvailableImpl();
265:                if (nChar < 0) {
266:                    throw new IOException();
267:                }
268:                return nChar;
269:            }
270:
271:            private native long ttyAvailableImpl();
272:
273:            public long ttyRead(byte[] bytes, int offset, int length)
274:                    throws IOException {
275:                long nChar = ttyReadImpl(bytes, offset, length);
276:                if (nChar < 0) {
277:                    throw new IOException();
278:                }
279:                return nChar;
280:            }
281:
282:            private native long ttyReadImpl(byte[] bytes, int offset, int length);
283:        }
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