Ant example source code file (DependencyAnalyzer.java)

This example Ant source code file (DependencyAnalyzer.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

dependencyanalyzer, enumeration, enumeration, file, file, io, ioexception, ioexception, object, object, util

The DependencyAnalyzer.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;
import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import org.apache.tools.ant.types.Path;

/**
 * A dependency analyzer analyzes dependencies between Java classes to
 * determine the minimal set of classes which are required by a set of
 * "root" classes. Different implementations of this interface can
 * use different strategies and libraries to determine the required set. For
 * example, some analyzers will use class files while others might use
 * source files. Analyzer specific configuration is catered for through a
 * generic configure method
 *
 */
public interface DependencyAnalyzer {
    /**
     * Add a source path to the source path used by this analyzer. The
     * elements in the given path contain the source files for the classes
     * being analyzed. Not all analyzers will use this information.
     *
     * @param sourcePath The Path instance specifying the source path
     *      elements.
     */
    void addSourcePath(Path sourcePath);

    /**
     * Add a classpath to the classpath being used by the analyzer. The
     * classpath contains the binary classfiles for the classes being
     * analyzed The elements may either be the directories or jar files.Not
     * all analyzers will use this information.
     *
     * @param classpath the Path instance specifying the classpath elements
     */
    void addClassPath(Path classpath);

    /**
     * Add a root class. The root classes are used to drive the
     * determination of dependency information. The analyzer will start at
     * the root classes and add dependencies from there.
     *
     * @param classname the name of the class in Java dot notation.
     */
    void addRootClass(String classname);

    /**
     * Get the list of files in the file system upon which the root classes
     * depend. The files will be either the classfiles or jar files upon
     * which the root classes depend.
     *
     * @return an enumeration of File instances.
     */
    Enumeration getFileDependencies();

    /**
     * Get the list of classes upon which root classes depend. This is a
     * list of Java classnames in dot notation.
     *
     * @return an enumeration of Strings, each being the name of a Java
     *      class in dot notation.
     */
    Enumeration getClassDependencies();


    /**
     * Reset the dependency list. This will reset the determined
     * dependencies and the also list of root classes.
     */
    void reset();

    /**
     * Configure an aspect of the analyzer. The set of aspects that are
     * supported is specific to each analyzer instance.
     *
     * @param name the name of the aspect being configured
     * @param info the configuration information.
     */
    void config(String name, Object info);

    /**
     * Set the closure flag. If this flag is true the analyzer will traverse
     * all class relationships until it has collected the entire set of
     * direct and indirect dependencies
     *
     * @param closure true if dependencies should be traversed to determine
     *      indirect dependencies.
     */
    void setClosure(boolean closure);


    /**
     * Get the file that contains the class definition
     *
     * @param classname the name of the required class
     * @return the file instance, zip or class, containing the
     *         class or null if the class could not be found.
     * @exception IOException if the files in the classpath cannot be read.
     */
    File getClassContainer(String classname) throws IOException;

    /**
     * Get the file that contains the class source.
     *
     * @param classname the name of the required class
     * @return the file instance, zip or java, containing the
     *         source or null if the source for the class could not be found.
     * @exception IOException if the files in the sourcepath cannot be read.
     */
    File getSourceContainer(String classname) throws IOException;
}