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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2009, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.shrinkwrap.impl.base.asset;

import org.jboss.shrinkwrap.api.ArchivePath;
import org.jboss.shrinkwrap.impl.base.path.BasicPath;

/**
 * AssetUtil
 * 
 * Util class to help extract name/paths from Assets.
 *
 * @author Aslak Knutsen
 * @version $Revision: $
 */
public final class AssetUtil {
    // -------------------------------------------------------------------------------------||
    // Class Members ----------------------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * The delimiter used for classes.
     */
    public static final String DELIMITER_CLASS_NAME_PATH = "\\.";

    /**
     * The delimiter used for classes represented in resource form.
     */
    public static final String DELIMITER_RESOURCE_PATH = "/";

    /**
     * Extension applied to .class files
     */
    private static final String EXTENSION_CLASS = ".class";

    // -------------------------------------------------------------------------------------||
    // Constructor ------------------------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * Private constructor for util class, should never be created.
     */
    private AssetUtil() {
    }

    // -------------------------------------------------------------------------------------||
    // External helpers -------------------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * Helper to extract a ClassloaderResources path information. 

     * 

     * ie: /user/test/file.properties = /user/test/
     *
     * @param resourceName
     *            The name of the resource
     * @return A Path representation of the give resource
     */
    public static ArchivePath getPathForClassloaderResource(String resourceName) {
        String extractedPath = null;
        if (resourceName.lastIndexOf('/') != -1) {
            extractedPath = resourceName.substring(0, resourceName.lastIndexOf('/'));
        }
        return new BasicPath(extractedPath);
    }

    /**
     * Helper to convert from java package name to class loader package name 

     * 

     * i.e.: javax.test + my.txt = javax/test/ + my.txt
     *
     * @param resourcePackage
     *            The base package
     * @param resourceName
     *            The resource inside the package.
     * @return {@link ClassLoader} resource location
     */
    public static String getClassLoaderResourceName(Package resourcePackage, String resourceName) {
        String resourcePackageName = resourcePackage.getName().replaceAll(DELIMITER_CLASS_NAME_PATH,
            DELIMITER_RESOURCE_PATH);

        return resourcePackageName + DELIMITER_RESOURCE_PATH + resourceName;
    }

    /**
     * Helper to extract a ClassloaderResources name. 

     * 

     * ie: /user/test/file.properties = file.properties
     *
     * @param resourceName
     *            The name of the resource
     * @return The name of the given resource
     */
    public static String getNameForClassloaderResource(String resourceName) {
        String fileName = resourceName;
        if (resourceName.indexOf('/') != -1) {
            fileName = resourceName.substring(resourceName.lastIndexOf('/') + 1, resourceName.length());
        }
        return fileName;
    }

    /**
     * Helper to extract a ClassResources full path. 

     * 

     * ie: package.MyClass = package/MyClass.class
     *
     * @param clazz
     *            The class whose resource path is to be extracted.
     * @return
     *            An {@link ArchivePath} representing the full path of the class resource.
     */
    public static ArchivePath getFullPathForClassResource(Class clazz) {
        String classResourceDelimiter = clazz.getName().replaceAll(DELIMITER_CLASS_NAME_PATH, DELIMITER_RESOURCE_PATH);
        String classFullPath = classResourceDelimiter + EXTENSION_CLASS;
        return new BasicPath(classFullPath);
    }

    /**
     * Helper to extract a ClassResources full path. 

     * 

     *
     * ie: package.MyClass = package/MyClass.class
     *
     * @param className
     *            The name of the class whose resource path is to be extracted.
     * @return
     *            An {@link ArchivePath} representing the full path of the class resource.
     */
    public static ArchivePath getFullPathForClassResource(String className) {
        String classResourceDelimiter = className.replaceAll(DELIMITER_CLASS_NAME_PATH, DELIMITER_RESOURCE_PATH);
        String classFullPath = classResourceDelimiter + EXTENSION_CLASS;
        return new BasicPath(classFullPath);
    }
}