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144 lines
5.3 KiB
Java
144 lines
5.3 KiB
Java
package org.aspectj.apache.bcel.verifier;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Vector;
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/**
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* This class produces instances of the Verifier class. Its purpose is to make
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* sure that they are singleton instances with respect to the class name they
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* operate on. That means, for every class (represented by a unique fully qualified
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* class name) there is exactly one Verifier.
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*
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* @version $Id: VerifierFactory.java,v 1.2 2008/05/28 23:53:00 aclement Exp $
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* @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
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* @see org.aspectj.apache.bcel.verifier.Verifier
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*/
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public class VerifierFactory{
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/**
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* The HashMap that holds the data about the already-constructed Verifier instances.
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*/
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private static HashMap hashMap = new HashMap();
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/**
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* The VerifierFactoryObserver instances that observe the VerifierFactory.
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*/
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private static Vector observers = new Vector();
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/**
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* The VerifierFactory is not instantiable.
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*/
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private VerifierFactory(){}
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/**
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* Returns the (only) verifier responsible for the class with the given name.
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* Possibly a new Verifier object is transparently created.
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* @return the (only) verifier responsible for the class with the given name.
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*/
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public static Verifier getVerifier(String fully_qualified_classname){
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// fully_qualified_classname = fully_qualified_classname;
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Verifier v = (Verifier) (hashMap.get(fully_qualified_classname));
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if (v==null){
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v = new Verifier(fully_qualified_classname);
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hashMap.put(fully_qualified_classname, v);
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notify(fully_qualified_classname);
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}
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return v;
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}
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/**
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* Notifies the observers of a newly generated Verifier.
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*/
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private static void notify(String fully_qualified_classname){
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// notify the observers
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Iterator i = observers.iterator();
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while (i.hasNext()){
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VerifierFactoryObserver vfo = (VerifierFactoryObserver) i.next();
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vfo.update(fully_qualified_classname);
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}
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}
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/**
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* Returns all Verifier instances created so far.
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* This is useful when a Verifier recursively lets
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* the VerifierFactory create other Verifier instances
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* and if you want to verify the transitive hull of
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* referenced class files.
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*/
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public static Verifier[] getVerifiers(){
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Verifier[] vs = new Verifier[hashMap.values().size()];
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return (Verifier[]) (hashMap.values().toArray(vs)); // Because vs is big enough, vs is used to store the values into and returned!
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}
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/**
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* Adds the VerifierFactoryObserver o to the list of observers.
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*/
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public static void attach(VerifierFactoryObserver o){
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observers.addElement(o);
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}
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/**
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* Removes the VerifierFactoryObserver o from the list of observers.
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*/
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public static void detach(VerifierFactoryObserver o){
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observers.removeElement(o);
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}
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}
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