Ant example source code file (AntAnalyzer.java)

This example Ant source code file (AntAnalyzer.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 - Ant tags/keywords

abstractanalyzer, antanalyzer, classfile, enumeration, enumeration, hashtable, hashtable, io, max_loops, string, string, util, vector, zip, zipentry, zipentry, zipfile

The AntAnalyzer.java source code

/*
 *  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.
 *
 */
package org.apache.tools.ant.taskdefs.optional.depend;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.tools.ant.util.depend.AbstractAnalyzer;

/**
 * An analyzer which uses the depend task's bytecode classes to analyze
 * dependencies
 *
 */
public class AntAnalyzer extends AbstractAnalyzer {
    /**
     * Default constructor
     */
    public AntAnalyzer() {
    }

    /**
     * Determine the dependencies of the configured root classes.
     *
     * @param files a vector to be populated with the files which contain
     *      the dependency classes
     * @param classes a vector to be populated with the names of the
     *      dependency classes.
     */
    protected void determineDependencies(Vector files, Vector classes) {
        // we get the root classes and build up a set of
        // classes upon which they depend
        Hashtable dependencies = new Hashtable();
        Hashtable containers = new Hashtable();
        Hashtable toAnalyze = new Hashtable();
        for (Enumeration e = getRootClasses(); e.hasMoreElements();) {
            String classname = (String) e.nextElement();
            toAnalyze.put(classname, classname);
        }

        int count = 0;
        int maxCount = isClosureRequired() ? MAX_LOOPS : 1;
        Hashtable analyzedDeps = null;
        while (toAnalyze.size() != 0 && count++ < maxCount) {
            analyzedDeps = new Hashtable();
            for (Enumeration e = toAnalyze.keys(); e.hasMoreElements();) {
                String classname = (String) e.nextElement();
                dependencies.put(classname, classname);
                try {
                    File container = getClassContainer(classname);
                    if (container == null) {
                        continue;
                    }
                    containers.put(container, container);

                    ZipFile zipFile = null;
                    InputStream inStream = null;
                    try {
                        if (container.getName().endsWith(".class")) {
                            inStream = new FileInputStream(container.getPath());
                        } else {
                            zipFile = new ZipFile(container.getPath());
                            String entryName
                                = classname.replace('.', '/') + ".class";
                            ZipEntry entry = new ZipEntry(entryName);
                            inStream
                                = zipFile.getInputStream(entry);
                        }
                        ClassFile classFile = new ClassFile();
                        classFile.read(inStream);
                        Vector dependencyList = classFile.getClassRefs();
                        Enumeration depEnum = dependencyList.elements();
                        while (depEnum.hasMoreElements()) {
                            String dependency = (String) depEnum.nextElement();
                            analyzedDeps.put(dependency, dependency);
                        }
                    } finally {
                        if (inStream != null) {
                            inStream.close();
                        }
                        if (zipFile != null) {
                            zipFile.close();
                        }
                    }
                } catch (IOException ioe) {
                    // ignore
                }
            }

            toAnalyze.clear();

            // now recover all the dependencies collected and add to the list.
            Enumeration depsEnum = analyzedDeps.elements();
            while (depsEnum.hasMoreElements()) {
                String className = (String) depsEnum.nextElement();
                if (!dependencies.containsKey(className)) {
                    toAnalyze.put(className, className);
                }
            }
        }

        // pick up the last round of dependencies that were determined
        Enumeration depsEnum = analyzedDeps.elements();
        while (depsEnum.hasMoreElements()) {
            String className = (String) depsEnum.nextElement();
            dependencies.put(className, className);
        }

        files.removeAllElements();
        for (Enumeration e = containers.keys(); e.hasMoreElements();) {
            files.addElement((File) e.nextElement());
        }

        classes.removeAllElements();
        for (Enumeration e = dependencies.keys(); e.hasMoreElements();) {
            classes.addElement((String) e.nextElement());
        }
    }

    /**
     * Indicate if this analyzer can determine dependent files.
     *
     * @return true if the analyzer provides dependency file information.
     */
    protected boolean supportsFileDependencies() {
        return true;
    }

}