JarResource.java

/**
 * jetbrick-template
 * http://subchen.github.io/jetbrick-template/
 *
 * Copyright 2010-2014 Guoqiang Chen. All rights reserved.
 * Email: subchen@gmail.com
 *
 * Licensed 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 jetbrick.template.resource;

import java.io.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import jetbrick.template.utils.ExceptionUtils;
import jetbrick.template.utils.IoUtils;

/**
 * 存放在 jar 中的资源.
 *
 * @since 1.1.3
 * @author Guoqiang Chen
 */
public class JarResource extends Resource {
    public static final String JAR_FILE_SEPARATOR = "!/";

    private final File jar;
    private final String entry;

    public JarResource(String name, File jar, String entry, String encoding) {
        super(name, encoding);
        this.jar = jar;
        this.entry = entry;
    }

    @Override
    public String getAbsolutePath() {
        return jar + JAR_FILE_SEPARATOR + entry;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        @SuppressWarnings("resource")
        JarFile jarFile = new JarFile(jar);
        JarEntry jarEntry = jarFile.getJarEntry(entry);
        if (jarEntry == null) return null;
        return jarFile.getInputStream(jarEntry);
    }

    @Override
    public char[] getSource(String encoding) {
        JarFile jarFile = null;
        try {
            jarFile = new JarFile(jar);
            JarEntry jarEntry = jarFile.getJarEntry(entry);
            if (jarEntry == null) return null;
            InputStream is = jarFile.getInputStream(jarEntry);
            try {
                return IoUtils.toCharArray(is, encoding);
            } finally {
                IoUtils.closeQuietly(is);
            }
        } catch (IOException e) {
            throw ExceptionUtils.uncheck(e);
        } finally {
            IoUtils.closeQuietly(jarFile);
        }
    }

    @Override
    public long lastModified() {
        return jar.lastModified();
    }
}