/* * Copyright (c) 2003, 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.Type;import sun.reflect.generics.factory.GenericsFactory;import sun.reflect.generics.tree.TypeSignature;import sun.reflect.generics.parser.SignatureParser;import sun.reflect.generics.visitor.Reifier;   /** * This class represents the generic type information for a constructor. * 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 FieldRepository extends AbstractRepository<TypeSignature> {     private Type genericType; // caches the generic type info  // protected, to enforce use of static factory yet allow subclassing    protected FieldRepository(String rawSig, GenericsFactory f) {      super(rawSig, f);    }     protected TypeSignature parse(String s) {        return SignatureParser.make().parseTypeSig(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>FieldRepository</tt> that manages the generic type     * information represented in the signature <tt>rawSig</tt>     */    public static FieldRepository make(String rawSig,                                             GenericsFactory f) {        return new FieldRepository(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 getGenericType(){        if (genericType == null) { // lazily initialize generic type            Reifier r = getReifier(); // obtain visitor            getTree().accept(r); // reify subtree            // extract result from visitor and cache it            genericType = r.getResult();        }        return genericType; // return cached result    }}