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Ant example source code file (AncestorAnalyzer.java)

This example Ant source code file (AncestorAnalyzer.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, ancestoranalyzer, ancestoranalyzer, classparser, enumeration, enumeration, file, hashtable, hashtable, io, ioexception, max_loops, string, string, util, vector

The AncestorAnalyzer.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.util.depend.bcel;
import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;
import org.apache.tools.ant.util.depend.AbstractAnalyzer;

/**
 * A dependency analyzer which returns superclass and superinterface
 * dependencies.
 *
 */
public class AncestorAnalyzer extends AbstractAnalyzer {

    /**
     * Default constructor
     *
     * Causes the BCEL classes to load to ensure BCEL dependencies can
     * be satisfied
     */
    public AncestorAnalyzer() {
        // force BCEL classes to load now
        try {
            new ClassParser("force");
        } catch (IOException e) {
            // ignore
        }
    }

    /**
     * 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
     *      depencency 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();
        Hashtable nextAnalyze = 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 : 2;
        while (toAnalyze.size() != 0 && count++ < maxCount) {
            nextAnalyze.clear();
            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);

                    ClassParser parser = null;
                    if (container.getName().endsWith(".class")) {
                        parser = new ClassParser(container.getPath());
                    } else {
                        parser = new ClassParser(container.getPath(),
                            classname.replace('.', '/') + ".class");
                    }

                    JavaClass javaClass = parser.parse();
                    String[] interfaces = javaClass.getInterfaceNames();
                    for (int i = 0; i < interfaces.length; ++i) {
                        String interfaceName = interfaces[i];
                        if (!dependencies.containsKey(interfaceName)) {
                            nextAnalyze.put(interfaceName, interfaceName);
                        }
                    }

                    if (javaClass.isClass()) {
                        String superClass = javaClass.getSuperclassName();
                        if (!dependencies.containsKey(superClass)) {
                            nextAnalyze.put(superClass, superClass);
                        }
                    }
                } catch (IOException ioe) {
                    // ignore
                }
            }

            Hashtable temp = toAnalyze;
            toAnalyze = nextAnalyze;
            nextAnalyze = temp;
        }

        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;
    }

}

Other Ant examples (source code examples)

Here is a short list of links related to this Ant AncestorAnalyzer.java source code file:

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