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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common
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* Development and Distribution License("CDDL") (collectively, the
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* "License"). You may not use this file except in compliance with the
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* License. You can obtain a copy of the License at
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* http://www.netbeans.org/cddl-gplv2.html
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* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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* specific language governing permissions and limitations under the
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* nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the GPL Version 2 section of the License file that
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* License Header, with the fields enclosed by brackets [] replaced by
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* your own identifying information:
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* "Portions Copyrighted [year] [name of copyright owner]"
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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
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package org.netbeans.modules.versioning.diff;
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import java.nio.charset.Charset;
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import java.util.List;
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import java.util.WeakHashMap;
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import org.netbeans.api.queries.FileEncodingQuery;
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import org.netbeans.spi.queries.FileEncodingQueryImplementation;
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import org.openide.ErrorManager;
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import org.openide.filesystems.FileObject;
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import org.openide.filesystems.FileUtil;
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* A FileEncodingQueryImplementation which allows to register a reference files encoding
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* for another files, so that a getEncoding call for a file actualy returns the reference
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* @author Tomas Stupka
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public class DiffFileEncodingQueryImpl extends FileEncodingQueryImplementation {
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private Map<File, Charset> fileToCharset;
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public Charset getEncoding(FileObject fo) {
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if(fileToCharset == null || fileToCharset.isEmpty() || fo == null || fo.isFolder()) {
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File file = FileUtil.toFile(fo);
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synchronized(fileToCharset) {
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return fileToCharset.get(file);
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} catch (Throwable t) {
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ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, t);
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* Retrieves the Charset for the referenceFile and associates it with
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* all files from the given list. A following getEncoding() call for
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* any file from the list will then return the referenceFile-s Charset.
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* @param referrenceFile the file which charset has to be used when encoding the files from the given list
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* @param files files to be encoded with the refernceFile-s charset
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void associateEncoding(File referenceFile, List<File> files) {
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FileObject fo = FileUtil.toFileObject(referenceFile);
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if(fo == null || fo.isFolder()) {
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Charset c = FileEncodingQuery.getEncoding(fo);
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if(fileToCharset == null) {
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fileToCharset = new WeakHashMap<File, Charset>();
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synchronized(fileToCharset) {
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for(File file : files) {
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fileToCharset.put(file, c);
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* Resets the asociation to a charset for every given file
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* @param files the files which have to be deregistered
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void resetEncodingForFiles(List<File> files) {
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if(fileToCharset == null || files == null || files.size() == 0) {
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synchronized(fileToCharset) {
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for(File file : files) {
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fileToCharset.remove(file);