001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package org.netbeans.editor.ext;
043:
044: import java.io.File;
045: import java.io.IOException;
046: import java.io.RandomAccessFile;
047:
048: /**
049: * DataAccessor for Code Completion DB files via RandomAccessFile implementation
050: *
051: * @author Martin Roskanin
052: */
053: public class FileAccessor implements DataAccessor {
054:
055: private File f;
056: private RandomAccessFile file;
057:
058: /** Creates a new instance of FileAccessor */
059: public FileAccessor(File file) {
060: f = file;
061: }
062:
063: /** Appends exactly <code>len</code> bytes, starting at <code>off</code> of the buffer pointer
064: * to the end of file resource.
065: * @param buffer the buffer from which the data is appended.
066: * @param off the start offset of the data in the buffer.
067: * @param len the number of bytes to append.
068: * @return the actual file offset before appending.
069: */
070: public void append(byte[] buffer, int off, int len)
071: throws IOException {
072: file.write(buffer, off, len);
073: }
074:
075: /** Reads up to len bytes of data from this file resource into an array of bytes.
076: * @param buffer the buffer into which the data is read.
077: * @param off the start offset of the data.
078: * @param len the maximum number of bytes read.
079: */
080:
081: public void read(byte[] buffer, int off, int len)
082: throws IOException {
083: file.readFully(buffer, off, len);
084: }
085:
086: /** Opens DataAccessor file resource
087: * @param requestWrite if true, file is opened for read/write operation.
088: */
089: public void open(boolean requestWrite) throws IOException {
090: file = new RandomAccessFile(f, requestWrite ? "rw" : "r"); //NOI18N
091: if (!f.exists()) {
092: f.createNewFile();
093: }
094: }
095:
096: /** Closes DataAccessor file resource */
097: public void close() throws IOException {
098: if (file != null) {
099: file.close();
100: }
101: }
102:
103: /**
104: * Returns the current offset in this file.
105: *
106: * @return the offset from the beginning of the file, in bytes,
107: * at which the next read or write occurs.
108: */
109: public long getFilePointer() throws IOException {
110: return file.getFilePointer();
111: }
112:
113: /** Clears the file and sets the offset to 0 */
114: public void resetFile() throws IOException {
115: file.setLength(0);
116: }
117:
118: public void seek(long pos) throws IOException {
119: file.seek(pos);
120: }
121:
122: public int getFileLength() {
123: return (int) f.length();
124: }
125:
126: public String toString() {
127: return f.getAbsolutePath();
128: }
129:
130: }
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