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package org.aspectj.apache.bcel.verifier;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (https://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <https://www.apache.org/>.
*/
import java.util.HashMap;
import java.util.Iterator;
import java.util.Vector;
/**
* This class produces instances of the Verifier class. Its purpose is to make
* sure that they are singleton instances with respect to the class name they
* operate on. That means, for every class (represented by a unique fully qualified
* class name) there is exactly one Verifier.
*
* @version $Id: VerifierFactory.java,v 1.3 2009/09/09 19:56:20 aclement Exp $
* @author <A HREF="https://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
* @see org.aspectj.apache.bcel.verifier.Verifier
*/
public class VerifierFactory{
/**
* The HashMap that holds the data about the already-constructed Verifier instances.
*/
private static HashMap<String, Verifier> hashMap = new HashMap<String, Verifier>();
/**
* The VerifierFactoryObserver instances that observe the VerifierFactory.
*/
private static Vector<VerifierFactoryObserver> observers = new Vector<VerifierFactoryObserver>();
/**
* The VerifierFactory is not instantiable.
*/
private VerifierFactory(){}
/**
* Returns the (only) verifier responsible for the class with the given name.
* Possibly a new Verifier object is transparently created.
* @return the (only) verifier responsible for the class with the given name.
*/
public static Verifier getVerifier(String fully_qualified_classname){
// fully_qualified_classname = fully_qualified_classname;
Verifier v = (hashMap.get(fully_qualified_classname));
if (v==null){
v = new Verifier(fully_qualified_classname);
hashMap.put(fully_qualified_classname, v);
notify(fully_qualified_classname);
}
return v;
}
/**
* Notifies the observers of a newly generated Verifier.
*/
private static void notify(String fully_qualified_classname){
// notify the observers
Iterator<VerifierFactoryObserver> i = observers.iterator();
while (i.hasNext()){
VerifierFactoryObserver vfo = i.next();
vfo.update(fully_qualified_classname);
}
}
/**
* Returns all Verifier instances created so far.
* This is useful when a Verifier recursively lets
* the VerifierFactory create other Verifier instances
* and if you want to verify the transitive hull of
* referenced class files.
*/
public static Verifier[] getVerifiers(){
Verifier[] vs = new Verifier[hashMap.values().size()];
return (hashMap.values().toArray(vs)); // Because vs is big enough, vs is used to store the values into and returned!
}
/**
* Adds the VerifierFactoryObserver o to the list of observers.
*/
public static void attach(VerifierFactoryObserver o){
observers.addElement(o);
}
/**
* Removes the VerifierFactoryObserver o from the list of observers.
*/
public static void detach(VerifierFactoryObserver o){
observers.removeElement(o);
}
}
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