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.IOException;
022import java.io.InputStreamReader;
023import java.io.Reader;
024import java.net.URL;
025import java.net.URLConnection;
026
027import org.osgi.framework.Bundle;
028
029/**
030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
031 */
032public class URLScript extends Script {
033
034    protected final URL url;
035
036    protected URLConnection conn;
037
038    public URLScript(URL url) throws IOException {
039        this.url = url;
040        conn = url.openConnection();
041    }
042
043    public URLScript(String location) throws IOException {
044        this(new URL(location));
045    }
046
047    public URLScript(Bundle bundle, String path) throws IOException {
048        this(bundle.getEntry(path));
049    }
050
051    @Override
052    public String getExtension() {
053        return getExtension(url.getPath());
054    }
055
056    @Override
057    public String getLocation() {
058        return url.toExternalForm();
059    }
060
061    @Override
062    public Reader getReaderIfModified() throws IOException {
063        URLConnection conn = url.openConnection();
064        long tm = conn.getLastModified();
065        if (tm > lastModified) {
066            synchronized (this) {
067                if (tm > lastModified) {
068                    lastModified = tm;
069                    return new InputStreamReader(conn.getInputStream());
070                }
071            }
072        }
073        return null;
074    }
075
076    @Override
077    public Reader getReader() throws IOException {
078        return new InputStreamReader(conn.getInputStream());
079    }
080
081}