php/php.project/src/org/netbeans/modules/php/project/PhpProjectEncodingQueryImpl.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.netbeans.modules.php.project;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import org.netbeans.modules.php.project.ui.customizer.PhpProjectProperties;
import org.netbeans.spi.project.support.ant.PropertyEvaluator;
import org.netbeans.spi.queries.FileEncodingQueryImplementation;
import org.openide.filesystems.FileObject;

/**
 * Copied from ruby project.
 * @author Tomas Zezula
 */
public class PhpProjectEncodingQueryImpl extends FileEncodingQueryImplementation implements PropertyChangeListener {

    private final PropertyEvaluator eval;
    private Charset cache;

    public PhpProjectEncodingQueryImpl(final PropertyEvaluator eval) {
        assert eval != null;
        this.eval = eval;
        this.eval.addPropertyChangeListener(this);
    }

    @Override
    public Charset getEncoding(FileObject file) {
        assert file != null;
        synchronized (this) {
            if (cache != null) {
                return cache;
            }
        }
        String enc = eval.getProperty(PhpProjectProperties.SOURCE_ENCODING);
        synchronized (this) {
            if (cache == null) {
                try {
                    //From discussion with K. Frank the project returns Charset.defaultCharset ()
                    //for older projects (no encoding property). The old project used system encoding => Charset.defaultCharset ()
                    //should work for most users.
                    cache = enc == null ? Charset.defaultCharset() : Charset.forName(enc);
                } catch (IllegalCharsetNameException exception) {
                    return null;
                }
            }
            return cache;
        }
    }

    @Override
    public void propertyChange(PropertyChangeEvent event) {
        String propName = event.getPropertyName();
        if (propName == null || propName.equals(PhpProjectProperties.SOURCE_ENCODING)) {
            synchronized (this) {
                cache = null;
            }
        }
    }
}