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Glassfish example source code file (ClassDependencyBuilder.java)

This example Glassfish source code file (ClassDependencyBuilder.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 - Glassfish tags/keywords

classdependencybuilder, exception, hashmap, hashset, hashset, linkedlist, list, map, nodeinfo, nodeinfo, set, set, string, string, util

The Glassfish ClassDependencyBuilder.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.glassfish.deployment.common;

import java.util.*;

/**
 * A class that can answer the following queries WITHOUT loading any classes
 *
 * Given a class C
 * 1. Find out all sub classes of C
 *
 * 2. Find out all classes that implemetns OR extends C
 *
 * 3. Find out all classes that are annotated with C
 *
 *
 * Usage:
 *
 * ClassDependencyBuilder cdb = new GraphBuilder();
 *      cdb.loadClassData(c1);
 *      cdb.loadClassData(c2);
 *      cdb.loadClassData(c3);
 *      ...
 *      ...
 *
 *      cdb.computeResult(c); // c can be any fully qualified class name (internal format or java format)
 * 
 * @author Mahesh Kannan
 */
public class ClassDependencyBuilder {

    private Map<String, NodeInfo> mappings = new HashMap();

    public ClassDependencyBuilder() {
    }

    public Set<String> computeResult(String name) {
        name = name.replace('.', '/');
        NodeInfo ni = mappings.get(name);
        if (ni != null) {
            if (ni.isAnnotation()) {
                return getAnnotatedClasses(ni);
            } else if (ni.isClass() || ni.isInterface()) {
                return getSubClasses(ni, ni.isInterface());
            } else {
                //System.out.println("????");
            }
        } else {
            //System.out.println("No info about: " + name);
        }

        return new HashSet<String>();
    }

    private Set<String> getAnnotatedClasses(NodeInfo ni) {
        Set<String> annotatedClasses = new HashSet();
        if (ni != null) {
            Set<NodeInfo> nInfos = ni.getDirectImplementors();
            if ((nInfos != null) && (nInfos.size() > 0)) {
                for (NodeInfo n : nInfos) {
                    annotatedClasses.add(n.getClassName());
                }
            }
        }

        return annotatedClasses;
    }

    private Set<String> getSubClasses(NodeInfo node, boolean addImplementors) {
        Set<String> assignables = new HashSet();
        if (node != null) {
            List<NodeInfo> list = new LinkedList();
            while (true) {
                Set<NodeInfo> set = node.getDirectSubClass();
                if ((set != null) && (set.size() > 0)) {
                    for (NodeInfo n : set) {
                        list.add(n);
                    }
                }

                if (addImplementors) {
                    Set<NodeInfo> intfs = node.getDirectImplementors();
                    if ((intfs != null) && (intfs.size() > 0)) {
                        for (NodeInfo n : intfs) {
                            list.add(n);
                        }
                    }
                }

                if (list.size() > 0) {
                    node = list.remove(0);
                    String name = node.getClassName();
                    if (!assignables.contains(name)) {
                        assignables.add(name);
                    }
                } else {
                    break;
                }
            }
        }
        return assignables;
    }

    public void loadClassData(byte[] classData)
            throws Exception {

        NodeInfo node = new NodeInfo(classData);
        String cname = node.getClassName();
        NodeInfo nodeInfo = mappings.get(cname);
        if ((nodeInfo == null) || (!nodeInfo.isParsed())) {
            if (nodeInfo == null) {
                mappings.put(cname, node);
                nodeInfo = node;
            } else {
                nodeInfo.load(classData);
            }
            populateMapping(nodeInfo);
        }
    }

    public int size() {
        return mappings.size();
    }

    private void populateMapping(NodeInfo nodeInfo) {
        String superName = nodeInfo.getSuperClassName();
        if (superName != null) {
            NodeInfo superNodeInfo = mappings.get(superName);
            if (superNodeInfo == null) {
                superNodeInfo = new NodeInfo(superName);
                if (nodeInfo.isClass()) {
                    superNodeInfo.markAsClassType();
                } else {
                    superNodeInfo.markAsInterfaceType();
                }
                mappings.put(superName, superNodeInfo);
            }
            superNodeInfo.addDirectSubClass(nodeInfo);
        }

        String[] interfaces = nodeInfo.getInterfaces();
        if ((interfaces != null) && (interfaces.length > 0)) {
            for (String interf : interfaces) {
                NodeInfo interfNodeInfo = mappings.get(interf);
                if (interfNodeInfo == null) {
                    interfNodeInfo = new NodeInfo(interf);
                    interfNodeInfo.markAsInterfaceType();
                    mappings.put(interf, interfNodeInfo);
                }
                interfNodeInfo.addDirectImplementor(nodeInfo);
            }
        }

        List<String> anns = nodeInfo.getClassLevelAnnotations();
        if ((anns != null) && (anns.size() > 0)) {
            for (String ann : anns) {
                NodeInfo annNode = mappings.get(ann);
                if (annNode == null) {
                    annNode = new NodeInfo(ann);
                    annNode.markAsAnnotaionType();
                    mappings.put(ann, annNode);
                }
                annNode.addDirectImplementor(nodeInfo);
            }
        }

    }

    void printInfo() {
        for (NodeInfo node : mappings.values()) {
            System.out.println(node.toString());
        }
    }


}

Other Glassfish examples (source code examples)

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