001/*
002 * The contents of this file are subject to the terms of the Common Development and
003 * Distribution License (the License). You may not use this file except in compliance with the
004 * License.
005 *
006 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
007 * specific language governing permission and limitations under the License.
008 *
009 * When distributing Covered Software, include this CDDL Header Notice in each file and include
010 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
011 * Header, with the fields enclosed by brackets [] replaced by your own identifying
012 * information: "Portions Copyright [year] [name of copyright owner]".
013 *
014 * Copyright 2010-2011 ApexIdentity Inc.
015 * Portions Copyright 2011-2014 ForgeRock AS.
016 */
017
018package org.forgerock.openig.resolver;
019
020import java.util.List;
021
022import org.forgerock.http.util.UnmodifiableCollection;
023
024/**
025 * Resolves {@link List} objects.
026 */
027@SuppressWarnings("rawtypes")
028public class ListResolver implements Resolver {
029
030    @Override
031    public Class<?> getKey() {
032        return List.class;
033    }
034
035    @Override
036    public Object get(Object object, Object element) {
037        if (object instanceof List && element instanceof Number) {
038            try {
039                return ((List) object).get(((Number) element).intValue());
040            } catch (IndexOutOfBoundsException ioobe) {
041                // cannot resolve index
042            }
043        }
044        return Resolver.UNRESOLVED;
045    }
046
047    @SuppressWarnings("unchecked")
048    @Override
049    public Object put(Object object, Object element, Object value) {
050        if (object instanceof List && !(object instanceof UnmodifiableCollection)
051                && element instanceof Number) {
052            List list = (List) object;
053            int index = ((Number) element).intValue();
054            try {
055                if (list.size() > index) {
056                    // within existing list
057                    list.set(index, value);
058                } else if (list.size() == index) {
059                    // appending to end of list
060                    list.add(element);
061                }
062                // otherwise, ignore out-of-range index
063            } catch (UnsupportedOperationException uoe) {
064                // ignore failed attempts to write to read-only list
065            }
066        }
067        return Resolver.UNRESOLVED;
068    }
069}