org.codehaus.mojo.antlr.proxy.Helper Maven / Gradle / Ivy

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Maven Plugin for Antlr v2
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package org.codehaus.mojo.antlr.proxy;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.net.URLClassLoader;
import java.net.URL;
import java.net.MalformedURLException;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.plugin.MojoExecutionException;

/**
 * TODO : javadoc
 * 
 * @author Steve Ebersole
 */
public class Helper {
    public static final Class[] NO_ARG_SIGNATURE = new Class[0];

    public static final Class[] STRING_ARG_SIGNATURE = new Class[] { String.class };

    public static final Object[] NO_ARGS = new Object[0];

    private final URLClassLoader antlrClassLoader;

    private final Class antlrToolClass;
    private final Class antlrPreprocessorToolClass;
    private final Class antlrHierarchyClass;
    private final Class antlrGrammarFileClass;
    private final Class antlrGrammarClass;
    private final Class antlrOptionClass;
    private final Class antlrIndexedVectorClass;

    public Helper(Artifact antlrArtifact) throws MojoExecutionException {
        try {
            this.antlrClassLoader = new URLClassLoader(new URL[] { antlrArtifact.getFile().toURL() }, ClassLoader.getSystemClassLoader());
        } catch (MalformedURLException e) {
            throw new MojoExecutionException("Unable to resolve antlr:antlr artifact url", e);
        }

        antlrToolClass = loadAntlrClass("antlr.Tool");
        antlrPreprocessorToolClass = loadAntlrClass("antlr.preprocessor.Tool");
        antlrHierarchyClass = loadAntlrClass("antlr.preprocessor.Hierarchy");
        antlrGrammarFileClass = loadAntlrClass("antlr.preprocessor.GrammarFile");
        antlrGrammarClass = loadAntlrClass("antlr.preprocessor.Grammar");
        antlrOptionClass = loadAntlrClass("antlr.preprocessor.Option");
        antlrIndexedVectorClass = loadAntlrClass("antlr.collections.impl.IndexedVector");
    }

    private Class loadAntlrClass(String className) throws MojoExecutionException {
        try {
            return antlrClassLoader.loadClass(className);
        } catch (ClassNotFoundException e) {
            throw new MojoExecutionException("could not load Antlr class :" + className, e);
        }
    }

    public Class getAntlrToolClass() {
        return antlrToolClass;
    }

    public Class getAntlrPreprocessorToolClass() {
        return antlrPreprocessorToolClass;
    }

    public Class getAntlrHierarchyClass() {
        return antlrHierarchyClass;
    }

    public Class getAntlrGrammarFileClass() {
        return antlrGrammarFileClass;
    }

    public Class getAntlrGrammarClass() {
        return antlrGrammarClass;
    }

    public Class getAntlrOptionClass() {
        return antlrOptionClass;
    }

    public Class getAntlrIndexedVectorClass() {
        return antlrIndexedVectorClass;
    }
}