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Groovy example source code file (JavaStubCompilationUnit.java)

This example Groovy source code file (JavaStubCompilationUnit.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

compilationfailedexception, compilationunit, compilerconfiguration, compilerconfiguration, file, file, groovyclassloader, io, javastubcompilationunit, javastubcompilationunit, javastubgenerator, net, network, override, override, sourceunit, string, util

The Groovy JavaStubCompilationUnit.java source code

/*
 * Copyright (C) 2006-2007 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.tools.javac;

import groovy.lang.GroovyClassLoader;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.classgen.GeneratorContext;
import org.codehaus.groovy.control.CompilationFailedException;
import org.codehaus.groovy.control.CompilationUnit;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.control.Phases;
import org.codehaus.groovy.control.SourceUnit;

import java.io.File;
import java.io.FileNotFoundException;
import java.net.URL;
import java.util.Map;

/**
 * Compilation unit to only generate stubs.
 *
 * @author <a href="mailto:jason@planet57.com">Jason Dillon
 */
public class JavaStubCompilationUnit
    extends CompilationUnit
{
    private static final String DOT_GROOVY = ".groovy";
    
    private final JavaStubGenerator stubGenerator;

    private int stubCount;

    public JavaStubCompilationUnit(final CompilerConfiguration config, final GroovyClassLoader gcl, File destDir) {
        super(config,null,gcl);
        assert config != null;

        Map options = config.getJointCompilationOptions();
        if (destDir == null) {
            destDir = (File) options.get("stubDir");
        }
        boolean useJava5 = config.getTargetBytecode().equals(CompilerConfiguration.POST_JDK5);
        stubGenerator = new JavaStubGenerator(destDir, false, useJava5);

        addPhaseOperation(new PrimaryClassNodeOperation() {
            @Override
            public void call(final SourceUnit source, final GeneratorContext context, final ClassNode node) throws CompilationFailedException {
                try {
                    stubGenerator.generateClass(node);
                    stubCount++;
                }
                catch (FileNotFoundException e) {
                    source.addException(e);
                }
            }
        },Phases.SEMANTIC_ANALYSIS);
    }

    public JavaStubCompilationUnit(final CompilerConfiguration config, final GroovyClassLoader gcl) {
        this(config, gcl, null);
    }

    public int getStubCount() {
        return stubCount;
    }

    @Override
    public void compile() throws CompilationFailedException {
        stubCount = 0;
        super.compile(Phases.SEMANTIC_ANALYSIS);
    }

    @Override
    public void configure(final CompilerConfiguration config) {
        super.configure(config);
        // GroovyClassLoader should be able to find classes compiled from java sources
        File targetDir = config.getTargetDirectory();
        if (targetDir != null) {
            final String classOutput = targetDir.getAbsolutePath();
            getClassLoader().addClasspath(classOutput);
        }
    }

    @Override
    public SourceUnit addSource(final File file) {
        if (file.getName().toLowerCase().endsWith(DOT_GROOVY)) {
            return super.addSource(file);
        }
        return null;
    }

    @Override
    public SourceUnit addSource(URL url) {
        if (url.getPath().toLowerCase().endsWith(DOT_GROOVY)) {
            return super.addSource(url);
        }
        return null;
    }

    @Deprecated
    public void addSourceFile(final File file) {
        addSource(file);
    }
}

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