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/*--------------------------------------------------------------------------
 *  Copyright 2009 Taro L. Saito
 *
 *  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.
 *--------------------------------------------------------------------------*/
// --------------------------------------
// sqlite-jdbc Project
//
// ResourceFinder.java
// Since: Apr 28, 2009
//
// $URL$
// $Author$
// --------------------------------------
package org.sqlite.util;

import java.net.URL;

/**
 * Resource address finder for files inside the jar file
 *
 * @author leo
 */
public class ResourceFinder {
    /**
     * Gets the {@link URL} of the file resource
     *
     * @param referenceClass the base class for finding resources files. This method will search the
     *     package containing the given referenceClass.
     * @param resourceFileName the resource file name relative to the package of the referenceClass
     * @return the URL of the file resource
     */
    public static URL find(Class referenceClass, String resourceFileName) {
        return find(referenceClass.getClassLoader(), referenceClass.getPackage(), resourceFileName);
    }

    /**
     * Finds the {@link URL} of the resource
     *
     * @param basePackage the base package to find the resource
     * @param resourceFileName the resource file name relative to the package folder
     * @return the URL of the specified resource
     */
    public static URL find(ClassLoader classLoader, Package basePackage, String resourceFileName) {
        return find(classLoader, basePackage.getName(), resourceFileName);
    }

    /**
     * Finds the {@link URL} of the resource
     *
     * @param packageName the base package name to find the resource
     * @param resourceFileName the resource file name relative to the package folder
     * @return the URL of the specified resource
     */
    public static URL find(ClassLoader classLoader, String packageName, String resourceFileName) {
        String packagePath = packagePath(packageName);
        String resourcePath = packagePath + resourceFileName;
        if (!resourcePath.startsWith("/")) resourcePath = "/" + resourcePath;

        return classLoader.getResource(resourcePath);
    }

    @SuppressWarnings("unused")
    private static String packagePath(Class referenceClass) {
        return packagePath(referenceClass.getPackage());
    }

    /**
     * @param basePackage Package object
     * @return Package path String in the unix-like format.
     */
    private static String packagePath(Package basePackage) {
        return packagePath(basePackage.getName());
    }

    /**
     * @param packageName Package name string
     * @return Package path String in the unix-like format.
     */
    private static String packagePath(String packageName) {
        String packageAsPath = packageName.replaceAll("\\.", "/");
        return packageAsPath.endsWith("/") ? packageAsPath : packageAsPath + "/";
    }
}