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/*
 * Copyright (c) 2007 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package com.fitbur.mockito.internal.configuration;

import com.fitbur.mockito.configuration.IMockitoConfiguration;
import com.fitbur.mockito.exceptions.misusing.MockitoConfigurationException;
import com.fitbur.mockito.plugins.MockMaker;


/**
 * Loads configuration or extension points available in the classpath.
 *
 * 
 * 

 *     
 *         Can load the mockito configuration. The user who want to provide his own mockito configuration
 *         should write the class com.fitbur.mockito.configuration.MockitoConfiguration that implements
 *         {@link IMockitoConfiguration}. For example :
 *         
 * package com.fitbur.mockito.configuration;
 *
 * //...
 *
 * public class MockitoConfiguration implements IMockitoConfiguration {
 *     boolean enableClassCache() { return false; }
 *
 *     // ...
 * }
 *     
 *     
 *     
 *         Can load available mockito extensions. Currently Mockito only have one extension point the
 *         {@link MockMaker}. This extension point allows a user to provide his own bytecode engine to build mocks.
 *         
Suppose you wrote an extension to create mocks with some Awesome library, in order to tell
 *         Mockito to use it you need to put in your classpath
 *         
 *             The implementation itself, for example org.awesome.mockito.AwesomeMockMaker.
 *             A file named com.fitbur.mockito.plugins.MockMaker in a folder named
 *             mockito-extensions, the content of this file need to have one line with
 *             the qualified name org.awesome.mockito.AwesomeMockMaker.
 *         
 *     
 * 
 * 
 */
public class ClassPathLoader {

    public static final String MOCKITO_CONFIGURATION_CLASS_NAME = "com.fitbur.mockito.configuration.MockitoConfiguration";

    /**
     * @return configuration loaded from classpath or null
     */
    @SuppressWarnings({"unchecked"})
    public IMockitoConfiguration loadConfiguration() {
        // Trying to get config from classpath
        Class configClass;
        try {
            configClass = Class.forName(MOCKITO_CONFIGURATION_CLASS_NAME);
        } catch (ClassNotFoundException e) {
            //that's ok, it means there is no global config, using default one.
            return null;
        }

        try {
            return (IMockitoConfiguration) configClass.newInstance();
        } catch (ClassCastException e) {
            throw new MockitoConfigurationException("MockitoConfiguration class must implement " + IMockitoConfiguration.class.getName() + " interface.", e);
        } catch (Exception e) {
            throw new MockitoConfigurationException("Unable to instantiate " + MOCKITO_CONFIGURATION_CLASS_NAME +" class. Does it have a safe, no-arg constructor?", e);
        }
    }
}