001/*
002 * (C) Copyright 2006-2011 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 *     bstefanescu
018 */
019package org.nuxeo.ecm.core.event.script;
020
021import java.io.File;
022import java.io.IOException;
023import java.io.InputStreamReader;
024import java.io.Reader;
025import java.net.URL;
026
027/**
028 * Script that comes from a JAR.
029 *
030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
031 */
032public class JARFileScript extends Script {
033
034    protected final URL url;
035
036    protected final File jar;
037
038    public JARFileScript(File jar, URL url) {
039        this.url = url;
040        this.jar = jar;
041    }
042
043    @Override
044    public String getExtension() {
045        return getExtension(url.getPath());
046    }
047
048    @Override
049    public String getLocation() {
050        return url.toExternalForm();
051    }
052
053    @Override
054    public Reader getReader() throws IOException {
055        return new InputStreamReader(url.openStream());
056    }
057
058    @Override
059    public Reader getReaderIfModified() throws IOException {
060        long tm = jar.lastModified();
061        if (tm > lastModified) {
062            synchronized (this) {
063                if (tm > lastModified) {
064                    lastModified = tm;
065                    return new InputStreamReader(url.openStream());
066                }
067            }
068        }
069        return null;
070    }
071
072}