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Groovy: A powerful, dynamic language for the JVM
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/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 groovy.lang;

import org.codehaus.groovy.plugin.GroovyRunner;
import org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl;
import org.codehaus.groovy.util.ReferenceBundle;
import org.codehaus.groovy.util.ReleaseInfo;

import java.util.HashMap;
import java.util.Map;

public final class GroovySystem {
    //
    //  TODO: make this initialization able to set useReflection true
    //  TODO: have some way of specifying another MetaClass Registry implementation
    //
    static {
        USE_REFLECTION = true;
        META_CLASS_REGISTRY = new MetaClassRegistryImpl();
    }
    
    /**
     * The MetaClass for java.lang.Object
     */
    private static MetaClass objectMetaClass;
    /**
     * If true then the MetaClass will only use reflection for method dispatch, property access, etc.
     */
    private static final boolean USE_REFLECTION;

    /**
     * Reference to the MetaClass Registry to be used by the Groovy run-time system to map classes to MetaClasses
     */
    private static final MetaClassRegistry META_CLASS_REGISTRY;

    /**
     * Reference to the Runtime Registry to be used by the Groovy run-time system to find classes capable of running scripts
     */
    public static final Map RUNNER_REGISTRY = new HashMap();

    private static boolean keepJavaMetaClasses=false;
    
    private GroovySystem() {
        // Do not allow this class to be instantiated
    }

    public static boolean isUseReflection() {
        return USE_REFLECTION;
    }

    public static MetaClassRegistry getMetaClassRegistry() {
        return META_CLASS_REGISTRY;
    }
    
    public static void setKeepJavaMetaClasses(boolean keepJavaMetaClasses) {
        GroovySystem.keepJavaMetaClasses = keepJavaMetaClasses;
    }
    
    public static boolean isKeepJavaMetaClasses() {
        return keepJavaMetaClasses;
    }
    
    /**
     * This method can be used to ensure that no threaded created
     * by a reference manager will be active. This is useful if the Groovy
     * runtime itself is loaded through a class loader which should be disposed
     * off. Without calling this method and if a threaded reference manager is
     * active the class loader cannot be unloaded!
     * 
     * Per default no threaded manager will be used.
     * 
     * @since 1.6
     */
    public static void stopThreadedReferenceManager() {
        ReferenceBundle.getSoftBundle().getManager().stopThread();
        ReferenceBundle.getWeakBundle().getManager().stopThread();
    }

    /**
     * Returns the groovy version
     */
    public static String getVersion() {
        return ReleaseInfo.getVersion();
    }
}