/*

 * 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.Type;

import sun.reflect.generics.factory.GenericsFactory;

import sun.reflect.generics.parser.SignatureParser;

import sun.reflect.generics.tree.FieldTypeSignature;

import sun.reflect.generics.tree.MethodTypeSignature;

import sun.reflect.generics.tree.TypeSignature;

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 ConstructorRepository

    extends GenericDeclRepository<MethodTypeSignature> {

    /** The generic parameter types.  Lazily initialized. */

    private volatile Type[] parameterTypes;

    /** The generic exception types.  Lazily initialized. */

    private volatile Type[] exceptionTypes;

 // protected, to enforce use of static factory yet allow subclassing

    protected ConstructorRepository(String rawSig, GenericsFactory f) {

      super(rawSig, f);

    }

    protected MethodTypeSignature parse(String s) {

        return SignatureParser.make().parseMethodSig(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 {@code ConstructorRepository} that manages the generic type

     * information represented in the signature {@code rawSig}

     */

    public static ConstructorRepository make(String rawSig, GenericsFactory f) {

        return new ConstructorRepository(rawSig, f);

    }

 /*

 * 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, which is created by feeding it the factory

 * with which the repository was created.

 */

    public Type[] getParameterTypes() {

        Type[] value = parameterTypes;

        if (value == null) {

            value = computeParameterTypes();

            parameterTypes = value;

        }

        return value.clone();

    }

    public Type[] getExceptionTypes() {

        Type[] value = exceptionTypes;

        if (value == null) {

            value = computeExceptionTypes();

            exceptionTypes = value;

        }

        return value.clone();

    }

    private Type[] computeParameterTypes() {

        // first, extract parameter type subtree(s) from AST

        TypeSignature[] pts = getTree().getParameterTypes();

        // create array to store reified subtree(s)

        int length = pts.length;

        Type[] parameterTypes = new Type[length];

        // reify all subtrees

        for (int i = 0; i < length; i++) {

            Reifier r = getReifier(); // obtain visitor

            pts[i].accept(r); // reify subtree

            // extract result from visitor and store it

            parameterTypes[i] = r.getResult();

        }

        return parameterTypes;

    }

    private Type[] computeExceptionTypes() {

        // first, extract exception type subtree(s) from AST

        FieldTypeSignature[] ets = getTree().getExceptionTypes();

        // create array to store reified subtree(s)

        int length = ets.length;

        Type[] exceptionTypes = new Type[length];

        // reify all subtrees

        for (int i = 0; i < length; i++) {

            Reifier r = getReifier(); // obtain visitor

            ets[i].accept(r); // reify subtree

            // extract result from visitor and store it

            exceptionTypes[i] = r.getResult();

        }

        return exceptionTypes;

    }

}