/*
 * Copyright 2016 Cisco Systems, Inc.
 *
 * 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 com.cisco.gerrit.plugins.slack.util;

import java.io.IOException;
import java.io.InputStream;

/**
 * Simple helper class to load resources via the current classloader.
 */
public final class ResourceHelper
{
    // Made private to prevent instantiation.
    private ResourceHelper() { }

    /**
     * Loads the named resource as an InputStream from the current
     * classloader.
     *
     * @param name The named resource.
     *
     * @return The named resource as an InputStream, null if not found.
     *
     * @throws IOException In the event of an IO error
     */
    public static InputStream loadNamedResourceAsStream(String name)
            throws IOException
    {
        InputStream result;
        result = null;

        if (name != null)
        {
            ClassLoader classLoader;
            classLoader = ResourceHelper.class.getClassLoader();

            result = classLoader.getResourceAsStream(name);
        }

        return result;
    }

    /**
     * Loads the named resource as a String from the current classloader.
     *
     * @param name The named resource.
     *
     * @return The named resource as a String, null if not found.
     *
     * @throws IOException In the event of an IO error
     */
    public static String loadNamedResourceAsString(String name)
            throws IOException
    {
        String result;
        result = null;

        InputStream inputStream;
        inputStream = ResourceHelper.loadNamedResourceAsStream(name);

        if (inputStream != null)
        {
            StringBuffer buffer;
            buffer = new StringBuffer();

            byte[] b;
            b = new byte[4096];

            for (int n; (n = inputStream.read(b)) != -1; )
            {
                buffer.append(new String(b, 0, n));
            }

            result = buffer.toString();
        }

        return result;
    }
}