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/*
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package com.sun.org.apache.bcel.internal.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 (http://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 [email protected].
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* 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
* .
*/
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 2007-07-19 04:34:56 ofung Exp $
* @author Enver Haase
* @see com.sun.org.apache.bcel.internal.verifier.Verifier
*/
public class VerifierFactory{
/**
* The HashMap that holds the data about the already-constructed Verifier instances.
*/
private static HashMap hashMap = new HashMap();
/**
* The VerifierFactoryObserver instances that observe the VerifierFactory.
*/
private static Vector observers = new Vector();
/**
* 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 = (Verifier) (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 i = observers.iterator();
while (i.hasNext()){
VerifierFactoryObserver vfo = (VerifierFactoryObserver) 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 (Verifier[]) (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);
}
}