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/*******************************************************************************
 * Copyright (C) 2022-2023 WaveMaker, 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.wavemaker.commons.classloader;

import java.io.InputStream;

import com.wavemaker.commons.WMRuntimeException;
import com.wavemaker.commons.util.TypeConversionUtils;

/**
 * @author Simon Toens
 * @author Jeremy Grelle
 */
public class ClassLoaderUtils {
    private ClassLoaderUtils() {
    }

    /**
     * Loads class specified by className from the ContextClassLoader.
     */
    public static Class loadClass(String className) {
        return loadClass(className, getClassLoader());
    }

    /**
     * Loads class specified by className from the ContextClassLoader.
     */
    public static Class loadClass(String className, boolean initialize) {
        return loadClass(className, initialize, getClassLoader());
    }

    /**
     * Loads class specified by className, using passed ClassLoader, and initializing the class.
     */
    public static Class loadClass(String className, ClassLoader loader) {
        return loadClass(className, true, loader);
    }

    /**
     * Loads class specified by className, using passed ClassLoader.
     */
    public static Class loadClass(String className, boolean initialize, ClassLoader loader) {
        try {
            Class rtn = TypeConversionUtils.primitiveForName(className);
            if (rtn == null) {
                // On Windows, if the class has been loaded from a jar, this
                // may hold an open reference to the jar.
                rtn = Class.forName(className, initialize, loader);
            }
            return rtn;
        } catch (ClassNotFoundException ex) {
            String s = ex.getMessage();
            if (s == null || s.equals("")) {
                s = "Cannot find class " + className;
            }
            throw new WMRuntimeException(s, ex);
        }
    }

    /**
     * Returns the context ClassLoader.
     */
    public static ClassLoader getClassLoader() {
        return Thread.currentThread().getContextClassLoader();
    }

    public static InputStream getResourceAsStream(String path) {
        return getClassLoader().getResourceAsStream(path);
    }
}