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Groovy example source code file (ParserPluginFactory.java)

This example Groovy source code file (ParserPluginFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

antlrparserpluginfactory, antlrparserpluginfactory, class, classloader, classnotfoundexception, classnotfoundexception, could, exception, parserplugin, parserpluginfactory, parserpluginfactory, runtimeexception, string, string

The Groovy ParserPluginFactory.java source code

/*
 * 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 org.codehaus.groovy.control;

import org.codehaus.groovy.antlr.AntlrParserPluginFactory;

/**
 * A factory of parser plugin instances
 *
 * @version $Revision: 6778 $
 */
public abstract class ParserPluginFactory {
    public static ParserPluginFactory newInstance(boolean useNewParser) {
        if (useNewParser) {
            Class type = null;
            String name = "org.codehaus.groovy.antlr.AntlrParserPluginFactory";
            try {
                type = Class.forName(name);
            }
            catch (ClassNotFoundException e) {
                try {
                    type = ParserPluginFactory.class.getClassLoader().loadClass(name);
                }
                catch (ClassNotFoundException e1) {
                    ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
                    if (contextClassLoader != null) {
                        try {
                            type = contextClassLoader.loadClass(name);
                        }
                        catch (ClassNotFoundException e2) {
                            // ignore
                        }
                    }
                }
            }

            if (type != null) {
                try {
                    return (ParserPluginFactory) type.newInstance();
                }
                catch (Exception e) {
                    throw new RuntimeException("Could not create AntlrParserPluginFactory: " + e, e);
                }
            }
            // can't find Antlr parser, so lets use the Classic one
        }
        return new AntlrParserPluginFactory();
    }

    public abstract ParserPlugin createParserPlugin();
}

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