/*******************************************************************************
 *
 * Copyright (c) 2010-2011 Sonatype, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *
 *
 *
 *
 *******************************************************************************/ 

package org.hudsonci.utils.io;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * I usually put these into something like "ResourceManager" and use it to do
 * all the loading. This manager can then cope with the exceptions and logging
 * so each part of the application doesn't have to.
 *
 * Having a separate manager for it also makes it easier to mock in tests to
 * verify interactions.
 *
 * @author Jamie Whitehouse
 * @since 2.1.0
 */
public class FileUtil {

    public static File canonicalize(final File file) {
        checkNotNull(file);
        try {
            return file.getCanonicalFile();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static URL getResource(String resource) {
        return Thread.currentThread().getContextClassLoader().getResource(resource);
    }

    public static File getResourceAsFile(String resource) {
        return new File(getResource(resource).getFile());
    }

    /**
     * Gets a resource relative to the given class.
     */
    public static File getResourceAsFile(Class clazz, String resource) {
        return new File(clazz.getResource(resource).getFile());
    }

    /**
     * Gets a resource using the current threads classloader.
     */
    public static InputStream getResourceAsStream(String resource) {
        return Thread.currentThread().getContextClassLoader().getResourceAsStream(resource);
    }

    /**
     * Gets a resource using the given classes classloader.
     */
    public static InputStream getResourceAsStream(Class clazz, String resource) {
        return clazz.getClassLoader().getResourceAsStream(resource);
    }
}