/*
* Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package sun.reflect.generics.repository;
import sun.reflect.generics.factory.GenericsFactory;
import sun.reflect.generics.tree.ClassSignature;
import sun.reflect.generics.tree.TypeTree;
import sun.reflect.generics.visitor.Reifier;
import sun.reflect.generics.parser.SignatureParser;
import java.lang.reflect.Type;
/**
* This class represents the generic type information for a class.
* The code is not dependent on a particular reflective implementation.
* It is designed to be used unchanged by at least core reflection and JDI.
*/
public class ClassRepository extends GenericDeclRepository<ClassSignature> {
private Type superclass; // caches the generic superclass info
private Type[] superInterfaces; // caches the generic superinterface info
// private, to enforce use of static factory
private ClassRepository(String rawSig, GenericsFactory f) {
super(rawSig, f);
}
protected ClassSignature parse(String s) {
return SignatureParser.make().parseClassSig(s);
}
/**
* Static factory method.
* @param rawSig - the generic signature of the reflective object
* that this repository is servicing
* @param f - a factory that will provide instances of reflective
* objects when this repository converts its AST
* @return a <tt>ClassRepository</tt> that manages the generic type
* information represented in the signature <tt>rawSig</tt>
*/
public static ClassRepository make(String rawSig, GenericsFactory f) {
return new ClassRepository(rawSig, f);
}
// public API
/*
* When queried for a particular piece of type information, the
* general pattern is to consult the corresponding cached value.
* If the corresponding field is non-null, it is returned.
* If not, it is created lazily. This is done by selecting the appropriate
* part of the tree and transforming it into a reflective object
* using a visitor.
* a visitor, which is created by feeding it the factory
* with which the repository was created.
*/
public Type getSuperclass(){
if (superclass == null) { // lazily initialize superclass
Reifier r = getReifier(); // obtain visitor
// Extract superclass subtree from AST and reify
getTree().getSuperclass().accept(r);
// extract result from visitor and cache it
superclass = r.getResult();
}
return superclass; // return cached result
}
public Type[] getSuperInterfaces(){
if (superInterfaces == null) { // lazily initialize super interfaces
// first, extract super interface subtree(s) from AST
TypeTree[] ts = getTree().getSuperInterfaces();
// create array to store reified subtree(s)
Type[] sis = new Type[ts.length];
// reify all subtrees
for (int i = 0; i < ts.length; i++) {
Reifier r = getReifier(); // obtain visitor
ts[i].accept(r);// reify subtree
// extract result from visitor and store it
sis[i] = r.getResult();
}
superInterfaces = sis; // cache overall result
}
return superInterfaces.clone(); // return cached result
}
}