Glassfish example source code file (NodeInfo.java)

This example Glassfish source code file (NodeInfo.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

already, cannot, classreader, hashset, illegalstateexception, illegalstateexception, io, nodeinfo, override, override, set, set, string, string, type, util

The Glassfish NodeInfo.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 org.objectweb.asm.*;

import java.util.List;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
import java.io.InputStream;


/**
 * A class that maintains information about a class
 *
 * @author Mahesh Kannan
 * 
 */
class NodeInfo
        implements ClassVisitor {

    private int nodeId;

    private int access;

    private String className;

    private String superClassName;

    private List<String> classLevelAnnotations;

    private String[] interfaces;

    private boolean parsed;

    private Set<String> directSubClasses;

    private Set<String> directImplementors;

    private Set<NodeInfo> directSubClassesNodeInfos;

    private Set<NodeInfo> directImplementorsNodeInfos;

    private String infoAsString;

    private int classType;

    private String classTypeAsString;

    private static final List<String> EMPTY_STRING_LIST = new ArrayList(0);

    private static final Set<NodeInfo> EMPTY_NODEINFO_SET = new HashSet();

    NodeInfo(byte[] classData) {
        ClassReader cr = new ClassReader(classData);
        infoAsString = className;

        cr.accept(this, ClassReader.SKIP_CODE);
    }

    void load(byte[] classData) {
        ClassReader cr = new ClassReader(classData);
        infoAsString = className;

        cr.accept(this, ClassReader.SKIP_CODE);
    }

    void markAsAnnotaionType() {
        if (! parsed) {
            classType = Opcodes.ACC_ANNOTATION;
        } else {
            throw new IllegalStateException("Cannot mark as AnnotationType. "
                    + "Already marked as " + classTypeAsString);
        }
    }

    void markAsClassType() {
        if (! parsed) {
            classType = 0;
        } else {
            throw new IllegalStateException("Cannot mark as Class Type. "
                    + "Already marked as " + classTypeAsString);
        }
    }

    void markAsInterfaceType() {
        if (! parsed) {
            classType = Opcodes.ACC_INTERFACE;
        } else {
            throw new IllegalStateException("Cannot mark as Interface Type. "
                    + "Already marked as " + classTypeAsString);
        }
    }

    void markAsEnumType() {
        if (! parsed) {
            classType = Opcodes.ACC_ENUM;
        } else {
            throw new IllegalStateException("Cannot mark as Enum Type. "
                    + "Already marked as " + classTypeAsString);
        }
    }

    NodeInfo(String className) {
        this.className = className;
        infoAsString = className;
    }

    int getNodeId() {
        return nodeId;
    }

    void setNodeId(int nodeId) {
        this.nodeId = nodeId;
    }

    String getClassName() {
        return className;
    }

    String getSuperClassName() {
        return superClassName;
    }

    List<String> getClassLevelAnnotations() {
        return classLevelAnnotations == null ? EMPTY_STRING_LIST : classLevelAnnotations;
    }

    String[] getInterfaces() {
        return interfaces == null ? new String[0] : interfaces;
    }

    void addDirectSubClass(NodeInfo ni) {
        String subClass = ni.getClassName();
        if (directSubClasses == null) {
            directSubClasses = new HashSet<String>();
            directSubClassesNodeInfos = new HashSet<NodeInfo>();
        }

        directSubClasses.add(subClass);
        directSubClassesNodeInfos.add(ni);
    }

    void addDirectImplementor( NodeInfo ni) {
        String implementor = ni.getClassName();
        if (directImplementors == null) {
            directImplementors = new HashSet<String>();
            directImplementorsNodeInfos = new HashSet<NodeInfo>();
        }

        directImplementors.add(implementor);
        directImplementorsNodeInfos.add(ni);
    }

    Set<NodeInfo> getDirectImplementors() {
        return directImplementorsNodeInfos == null ? EMPTY_NODEINFO_SET : directImplementorsNodeInfos;
    }

    Set<NodeInfo> getDirectSubClass() {
        return directSubClassesNodeInfos == null ?  EMPTY_NODEINFO_SET : directSubClassesNodeInfos;
    }

    boolean isInterface() {
        return classType == Opcodes.ACC_INTERFACE;
    }

    boolean isAnnotation() {
        return classType == Opcodes.ACC_ANNOTATION;
    }

    boolean isClass() {
        return classType == 0;
    }

    @Override
    public void visit(int version, int access, String className, String signature,
                      String superName, String[] interfaces) {
        if ((this.className != null) && (! this.className.equals(className))) {
            throw new IllegalStateException("Internal error: " + className + " != " + this.className);
        }

        this.access = access;
        this.className = className;
        this.superClassName = superName;
        this.interfaces = interfaces == null ? new String[0] : interfaces;

        determineClassType();
    }

    public void determineClassType() {

        if ((access & Opcodes.ACC_ANNOTATION) != 0) {
            classType = Opcodes.ACC_ANNOTATION;
            classTypeAsString = "ANNOTATION";
        } else if ((access & Opcodes.ACC_INTERFACE) != 0) {
            classType = Opcodes.ACC_INTERFACE;
            classTypeAsString = "INTERFACE";
        } else if ((access & Opcodes.ACC_ENUM) != 0) {
            classType = Opcodes.ACC_ENUM;
            classTypeAsString = "ENUM";
        } else {
            classType = 0;
            classTypeAsString = "CLASS";
        }
    }

    public String getClassTypeAsString() {
        return classTypeAsString;
    }

    @Override
    public void visitSource(String s, String s1) {
    }

    @Override
    public void visitOuterClass(String s, String s1, String s2) {
    }

    @Override
    public AnnotationVisitor visitAnnotation(String s, boolean b) {
        if (classLevelAnnotations == null) {
            classLevelAnnotations = new ArrayList<String>(2);
        }
        int len = s.length();
        s = s.substring(1, len-1);
        classLevelAnnotations.add(s);
        return null;
    }

    @Override
    public void visitAttribute(Attribute attribute) {
    }

    @Override
    public void visitInnerClass(String s, String s1, String s2, int i) {
    }

    @Override
    public FieldVisitor visitField(int i, String s, String s1, String s2, Object o) {
        return null;
    }

    @Override
    public MethodVisitor visitMethod(int i, String s, String s1, String s2, String[] strings) {
        return null;
    }

    public boolean isParsed() {
        return parsed;
    }

    @Override
    public void visitEnd() {
        parsed = true;
    }

    public String toString() {

        StringBuilder sb = new StringBuilder(className).append(": ");
        if (classLevelAnnotations != null) {
            for (String ann : classLevelAnnotations) {
                sb.append("\n  @").append(ann).append(" ");
            }
        }
        sb.append(className).append(":");
        if (superClassName != null) {
            sb.append(" -> ").append(superClassName);
        }
        if (interfaces != null) {
            String delim = " & ";
            for (String inter : interfaces) {
                sb.append(delim).append(inter);
                delim = ", ";
            }
        }

        infoAsString = sb.toString();
        if (directSubClasses != null) {
            for (String sub : directSubClasses) {
                sb.append("\n\tdirect subclass => ").append(sub);
            }
        }
        if (directImplementors != null) {
            for (String impl : directImplementors) {
                sb.append("\n\tdirect implementor => ").append(impl);
            }
        }
        sb.append("\n**********************");
        return sb.toString();
    }
}