001/*
002 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Jean-Marc Orliaguet, Chalmers
018 *
019 * $Id$
020 */
021
022package org.nuxeo.theme.html;
023
024import java.io.ByteArrayInputStream;
025import java.io.ByteArrayOutputStream;
026import java.io.IOException;
027import java.io.InputStream;
028import java.io.OutputStream;
029
030import org.apache.commons.logging.Log;
031import org.apache.commons.logging.LogFactory;
032import org.nuxeo.theme.html.JSMin.UnterminatedCommentException;
033import org.nuxeo.theme.html.JSMin.UnterminatedRegExpLiteralException;
034import org.nuxeo.theme.html.JSMin.UnterminatedStringLiteralException;
035import org.nuxeo.theme.themes.ThemeException;
036
037public final class JSUtils {
038
039    static final Log log = LogFactory.getLog(JSUtils.class);
040
041    public static String compressSource(final String source) throws ThemeException {
042        String compressedSource = source;
043        InputStream in = null;
044        OutputStream out = null;
045
046        try {
047            in = new ByteArrayInputStream(source.getBytes());
048            out = new ByteArrayOutputStream();
049
050            JSMin compressor = new JSMin(in, out);
051            try {
052                compressor.jsmin();
053            } catch (UnterminatedRegExpLiteralException e) {
054                throw new ThemeException("Could not compress javascript", e);
055            } catch (UnterminatedCommentException e) {
056                throw new ThemeException("Could not compress javascript", e);
057            } catch (UnterminatedStringLiteralException e) {
058                throw new ThemeException("Could not compress javascript", e);
059            }
060            compressedSource = out.toString();
061        } catch (IOException e) {
062            throw new ThemeException("Could not compress javascript", e);
063        } finally {
064            if (out != null) {
065                try {
066                    out.close();
067                } catch (IOException e) {
068                    log.error(e, e);
069                } finally {
070                    out = null;
071                }
072            }
073        }
074        if (in != null) {
075            try {
076                in.close();
077            } catch (IOException e) {
078                log.error(e, e);
079            } finally {
080                in = null;
081            }
082        }
083
084        return compressedSource;
085    }
086
087}