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 1997-2007 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
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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
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040: */
041:
042: package org.netbeans.modules.ruby.rubyproject.queries;
043:
044: import java.beans.PropertyChangeEvent;
045: import java.beans.PropertyChangeListener;
046: import java.nio.charset.Charset;
047: import java.nio.charset.IllegalCharsetNameException;
048: import org.netbeans.modules.ruby.rubyproject.ui.customizer.RubyProjectProperties;
049: import org.netbeans.spi.queries.FileEncodingQueryImplementation;
050: import org.netbeans.modules.ruby.spi.project.support.rake.PropertyEvaluator;
051: import org.openide.filesystems.FileObject;
052:
053: /**
054: *
055: * @author Tomas Zezula
056: */
057: public class RubyProjectEncodingQueryImpl extends
058: FileEncodingQueryImplementation implements
059: PropertyChangeListener {
060:
061: private final PropertyEvaluator eval;
062: private Charset cache;
063:
064: /** Creates a new instance of J2SEProjectEncodingQueryImpl */
065: public RubyProjectEncodingQueryImpl(final PropertyEvaluator eval) {
066: assert eval != null;
067: this .eval = eval;
068: this .eval.addPropertyChangeListener(this );
069: }
070:
071: public Charset getEncoding(FileObject file) {
072: assert file != null;
073: synchronized (this ) {
074: if (cache != null) {
075: return cache;
076: }
077: }
078: String enc = eval
079: .getProperty(RubyProjectProperties.SOURCE_ENCODING);
080: synchronized (this ) {
081: if (cache == null) {
082: try {
083: //From discussion with K. Frank the project returns Charset.defaultCharset ()
084: //for older projects (no encoding property). The old project used system encoding => Charset.defaultCharset ()
085: //should work for most users.
086: cache = enc == null ? Charset.defaultCharset()
087: : Charset.forName(enc);
088: } catch (IllegalCharsetNameException exception) {
089: return null;
090: }
091: }
092: return cache;
093: }
094: }
095:
096: public void propertyChange(PropertyChangeEvent event) {
097: String propName = event.getPropertyName();
098: if (propName == null
099: || propName
100: .equals(RubyProjectProperties.SOURCE_ENCODING)) {
101: synchronized (this) {
102: cache = null;
103: }
104: }
105: }
106:
107: }
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