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Ant example source code file (DependScanner.java)

This example Ant source code file (DependScanner.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

default_analyzer_class, dependencyanalyzer, dependscanner, directoryscanner, directoryscanner, enumeration, file, file, hashtable, illegalstateexception, io, string, string, util, vector, vector

The DependScanner.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.types.optional.depend;

import java.io.File;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.util.depend.DependencyAnalyzer;


/**
 * DirectoryScanner for finding class dependencies.
 */
public class DependScanner extends DirectoryScanner {
    /**
     * The name of the analyzer to use by default.
     */
    public static final String DEFAULT_ANALYZER_CLASS
        = "org.apache.tools.ant.util.depend.bcel.FullAnalyzer";

    /**
     * The root classes to drive the search for dependent classes.
     */
    private Vector rootClasses;

    /**
     * The names of the classes to include in the fileset.
     */
    private Vector included;

    /**
     * The parent scanner which gives the basic set of files. Only files which
     * are in this set and which can be reached from a root class will end
     * up being included in the result set.
     */
    private DirectoryScanner parentScanner;

    /**
     * Create a DependScanner, using the given scanner to provide the basic
     * set of files from which class files come.
     *
     * @param parentScanner the DirectoryScanner which returns the files from
     *        which class files must come.
     */
    public DependScanner(DirectoryScanner parentScanner) {
        this.parentScanner = parentScanner;
    }

    /**
     * Sets the root classes to be used to drive the scan.
     *
     * @param rootClasses the rootClasses to be used for this scan.
     */
    public synchronized void setRootClasses(Vector rootClasses) {
        this.rootClasses = rootClasses;
    }

    /**
     * Get the names of the class files on which baseClass depends.
     *
     * @return the names of the files.
     */
    public String[] getIncludedFiles() {
        String[] files = new String[getIncludedFilesCount()];
        for (int i = 0; i < files.length; i++) {
            files[i] = (String) included.elementAt(i);
        }
        return files;
    }

    /** {@inheritDoc}. */
    public synchronized int getIncludedFilesCount() {
        if (included == null) {
            throw new IllegalStateException();
        }
        return included.size();
    }

    /**
     * Scans the base directory for files on which baseClass depends.
     *
     * @exception IllegalStateException when basedir was set incorrectly.
     */
    public synchronized void scan() throws IllegalStateException {
        included = new Vector();
        String analyzerClassName = DEFAULT_ANALYZER_CLASS;
        DependencyAnalyzer analyzer = null;
        try {
            Class analyzerClass = Class.forName(analyzerClassName);
            analyzer = (DependencyAnalyzer) analyzerClass.newInstance();
        } catch (Exception e) {
            throw new BuildException("Unable to load dependency analyzer: "
                + analyzerClassName, e);
        }
        analyzer.addClassPath(new Path(null, basedir.getPath()));

        for (Enumeration e = rootClasses.elements(); e.hasMoreElements();) {
            String rootClass = (String) e.nextElement();
            analyzer.addRootClass(rootClass);
        }
        Enumeration e = analyzer.getClassDependencies();

        String[] parentFiles = parentScanner.getIncludedFiles();
        Hashtable parentSet = new Hashtable();
        for (int i = 0; i < parentFiles.length; ++i) {
            parentSet.put(parentFiles[i], parentFiles[i]);
        }
        while (e.hasMoreElements()) {
            String classname = (String) e.nextElement();
            String filename = classname.replace('.', File.separatorChar);
            filename = filename + ".class";
            File depFile = new File(basedir, filename);
            if (depFile.exists() && parentSet.containsKey(filename)) {
                // This is included
                included.addElement(filename);
            }
        }
    }

    /**
     * @see DirectoryScanner#addDefaultExcludes
     */
    public void addDefaultExcludes() {
    }

    /**
     * @see DirectoryScanner#getExcludedDirectories
     */
    /** {@inheritDoc}. */
    public String[] getExcludedDirectories() {
        return null;
    }

    /**
     * @see DirectoryScanner#getExcludedFiles
     */
    /** {@inheritDoc}. */
    public String[] getExcludedFiles() {
        return null;
    }

    /**
     * @see DirectoryScanner#getIncludedDirectories
     */
    /** {@inheritDoc}. */
    public String[] getIncludedDirectories() {
        return new String[0];
    }

    /**
     * @see DirectoryScanner#getIncludedDirsCount
     */
    /** {@inheritDoc}. */
    public int getIncludedDirsCount() {
        return 0;
    }

    /**
     * @see DirectoryScanner#getNotIncludedDirectories
     */
    /** {@inheritDoc}. */
    public String[] getNotIncludedDirectories() {
        return null;
    }

    /**
     * @see DirectoryScanner#getNotIncludedFiles
     */
    /** {@inheritDoc}. */
    public String[] getNotIncludedFiles() {
        return null;
    }

    /**
     * @see DirectoryScanner#setExcludes
     */
    /** {@inheritDoc}. */
    public void setExcludes(String[] excludes) {
    }

    /**
     * @see DirectoryScanner#setIncludes
     */
    /** {@inheritDoc}. */
    public void setIncludes(String[] includes) {
    }

    /**
     * @see DirectoryScanner#setCaseSensitive
     */
    /** {@inheritDoc}. */
    public void setCaseSensitive(boolean isCaseSensitive) {
    }
}

Other Ant examples (source code examples)

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

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