org.apache.shindig.common.util.ResourceLoader.java Source code

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Here is the source code for org.apache.shindig.common.util.ResourceLoader.java

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/*
 * 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.shindig.common.util;

import org.apache.commons.io.IOUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Handles loading contents from resource and file system files.
 */
public final class ResourceLoader {
    private ResourceLoader() {
    }

    /**
     * Opens a given path as either a resource or a file, depending on the path
     * name.
     *
     * If path starts with res://, we interpret it as a resource.
     * Otherwise we attempt to load it as a file.
     * @param path
     * @return The opened input stream
     */
    public static InputStream open(String path) throws IOException {
        if (path.startsWith("res://")) {
            return openResource(path.substring(6));
        }
        File file = new File(path);
        return new FileInputStream(file);
    }

    /**
     * @param resource
     * @return An input stream for the given named resource
     * @throws FileNotFoundException
     */
    public static InputStream openResource(String resource) throws IOException {
        ClassLoader cl = ResourceLoader.class.getClassLoader();
        InputStream is = cl.getResourceAsStream(resource.trim());
        if (is == null) {
            throw new FileNotFoundException("Can not locate resource: " + resource);
        }
        return is;
    }

    /**
     * Reads the contents of a resource as a string.
     *
     * @param resource
     * @return Contents of the resource.
     * @throws IOException
     */
    public static String getContent(String resource) throws IOException {
        InputStream is = openResource(resource);
        try {
            return IOUtils.toString(is, "UTF-8");
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

    /**
     * @param file
     * @return The contents of the file (assumed to be UTF-8).
     * @throws IOException
     */
    public static String getContent(File file) throws IOException {
        InputStream is = new FileInputStream(file);
        try {
            return IOUtils.toString(is, "UTF-8");
        } finally {
            IOUtils.closeQuietly(is);
        }
    }
}