/* * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.reflect.generics.repository; import java.lang.reflect.TypeVariable;import sun.reflect.generics.factory.GenericsFactory;import sun.reflect.generics.tree.FormalTypeParameter;import sun.reflect.generics.tree.Signature;import sun.reflect.generics.visitor.Reifier;   /** * This class represents the generic type information for a generic * declaration. * 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 abstract class GenericDeclRepository<S extends Signature>    extends AbstractRepository<S> {     private TypeVariable[] typeParams; // caches the formal type parameters     protected GenericDeclRepository(String rawSig, GenericsFactory f) {        super(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. */     /**     * Return the formal type parameters of this generic declaration.     * @return the formal type parameters of this generic declaration     */    public TypeVariable/*<?>*/[] getTypeParameters(){        if (typeParams == null) { // lazily initialize type parameters            // first, extract type parameter subtree(s) from AST            FormalTypeParameter[] ftps = getTree().getFormalTypeParameters();            // create array to store reified subtree(s)            TypeVariable[] tps = new TypeVariable[ftps.length];            // reify all subtrees            for (int i = 0; i < ftps.length; i++) {                Reifier r = getReifier(); // obtain visitor                ftps[i].accept(r); // reify subtree                // extract result from visitor and store it                tps[i] = (TypeVariable<?>) r.getResult();            }            typeParams = tps; // cache overall result        }        return typeParams.clone(); // return cached result    }}