01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * The contents of this file are subject to the terms of either the GNU
07: * General Public License Version 2 only ("GPL") or the Common
08: * Development and Distribution License("CDDL") (collectively, the
09: * "License"). You may not use this file except in compliance with the
10: * License. You can obtain a copy of the License at
11: * http://www.netbeans.org/cddl-gplv2.html
12: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
13: * specific language governing permissions and limitations under the
14: * License. When distributing the software, include this License Header
15: * Notice in each file and include the License file at
16: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
17: * particular file as subject to the "Classpath" exception as provided
18: * by Sun in the GPL Version 2 section of the License file that
19: * accompanied this code. If applicable, add the following below the
20: * License Header, with the fields enclosed by brackets [] replaced by
21: * your own identifying information:
22: * "Portions Copyrighted [year] [name of copyright owner]"
23: *
24: * Contributor(s):
25: *
26: * The Original Software is NetBeans. The Initial Developer of the Original
27: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
28: * Microsystems, Inc. All Rights Reserved.
29: *
30: * If you wish your version of this file to be governed by only the CDDL
31: * or only the GPL Version 2, indicate your decision by adding
32: * "[Contributor] elects to include this software in this distribution
33: * under the [CDDL or GPL Version 2] license." If you do not indicate a
34: * single choice of license, a recipient has the option to distribute
35: * your version of this file under either the CDDL, the GPL Version 2 or
36: * to extend the choice of license to its licensees as provided above.
37: * However, if you add GPL Version 2 code and therefore, elected the GPL
38: * Version 2 license, then the option applies only if the new code is
39: * made subject to such option by the copyright holder.
40: */
41:
42: package org.netbeans.modules.java.source.engine;
43:
44: import java.io.CharArrayReader;
45: import java.io.IOException;
46:
47: /**
48: * Utility class for reading source files.
49: */
50: public class SourceReader extends CharArrayReader {
51:
52: /**
53: * Create a new SourceReader instance.
54: *
55: * @param src the array of characters which are the source file's contents.
56: */
57: public SourceReader(char[] src) {
58: super (src);
59: }
60:
61: /**
62: * Set position to specified array offset.
63: */
64: public long seek(int offset) throws IOException {
65: return skip(offset - pos);
66: }
67:
68: /**
69: * Returns the chars between the current position and a
70: * specified offset.
71: *
72: * @param offset the ending offset of the text range to return.
73: * @throws IOException if the current position is greater
74: * than the offset, or if the offset is outside the
75: * range of the SourceReader's character array.
76: */
77: public char[] getCharsTo(int offset) throws IOException {
78: int len = offset - pos;
79: if (len < 0 || offset > super .count)
80: throw new IOException("invalid offset: " + offset);
81: char[] buf = new char[len];
82: read(buf);
83: return buf;
84: }
85:
86: /**
87: * Returns current reader position.
88: *
89: * @return reader position
90: */
91: public int getPos() {
92: return pos;
93: }
94: }
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