/*
 * 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.apache.catalina.webresources;

import java.io.IOException;
import java.io.InputStream;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

import org.apache.catalina.WebResourceRoot;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;

/**
 * Represents a single resource (file or directory) that is located within a
 * JAR.
 */
public class JarResource extends AbstractArchiveResource {

    private static final Log log = LogFactory.getLog(JarResource.class);

    public JarResource(WebResourceRoot root, String webAppPath, String base,
            String baseUrl, JarEntry jarEntry, String internalPath) {
        super(root, webAppPath, base, "jar:" + baseUrl, jarEntry, internalPath);
    }

    @Override
    public InputStream getInputStream() {
        try {
            JarFile jarFile = new JarFile(getBase());
            InputStream is = jarFile.getInputStream(getResource());
            return new JarInputStreamWrapper(jarFile, is);
        } catch (IOException e) {
            if (log.isDebugEnabled()) {
                log.debug(sm.getString("fileResource.getInputStreamFail",
                        getResource().getName(), getBaseUrl()), e);
            }
            return null;
        }
    }

    @Override
    protected Log getLog() {
        return log;
    }
}