86 lines
3.5 KiB
Java
86 lines
3.5 KiB
Java
/*
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.reflect.generics.repository;
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import java.lang.reflect.TypeVariable;
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import sun.reflect.generics.factory.GenericsFactory;
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import sun.reflect.generics.tree.FormalTypeParameter;
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import sun.reflect.generics.tree.Signature;
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import sun.reflect.generics.visitor.Reifier;
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/**
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* This class represents the generic type information for a generic
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* declaration.
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* The code is not dependent on a particular reflective implementation.
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* It is designed to be used unchanged by at least core reflection and JDI.
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*/
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public abstract class GenericDeclRepository<S extends Signature>
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extends AbstractRepository<S> {
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/** The formal type parameters. Lazily initialized. */
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private volatile TypeVariable<?>[] typeParams;
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protected GenericDeclRepository(String rawSig, GenericsFactory f) {
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super(rawSig, f);
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}
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// public API
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/*
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* When queried for a particular piece of type information, the
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* general pattern is to consult the corresponding cached value.
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* If the corresponding field is non-null, it is returned.
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* If not, it is created lazily. This is done by selecting the appropriate
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* part of the tree and transforming it into a reflective object
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* using a visitor, which is created by feeding it the factory
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* with which the repository was created.
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*/
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/**
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* Return the formal type parameters of this generic declaration.
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* @return the formal type parameters of this generic declaration
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*/
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public TypeVariable<?>[] getTypeParameters() {
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TypeVariable<?>[] typeParams = this.typeParams;
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if (typeParams == null) { // lazily initialize type parameters
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// first, extract type parameter subtree(s) from AST
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FormalTypeParameter[] ftps = getTree().getFormalTypeParameters();
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// create array to store reified subtree(s)
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typeParams = new TypeVariable<?>[ftps.length];
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// reify all subtrees
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for (int i = 0; i < ftps.length; i++) {
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Reifier r = getReifier(); // obtain visitor
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ftps[i].accept(r); // reify subtree
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// extract result from visitor and store it
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typeParams[i] = (TypeVariable<?>) r.getResult();
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}
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this.typeParams = typeParams; // cache overall result
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}
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return typeParams.clone(); // return cached result
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}
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}
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