001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common Development
008: * and Distribution License("CDDL") (collectively, the "License"). You
009: * may not use this file except in compliance with the License. You can obtain
010: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
011: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
012: * language governing permissions and limitations under the License.
013: *
014: * When distributing the software, include this License Header Notice in each
015: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
016: * Sun designates this particular file as subject to the "Classpath" exception
017: * as provided by Sun in the GPL Version 2 section of the License file that
018: * accompanied this code. If applicable, add the following below the License
019: * Header, with the fields enclosed by brackets [] replaced by your own
020: * identifying information: "Portions Copyrighted [year]
021: * [name of copyright owner]"
022: *
023: * Contributor(s):
024: *
025: * If you wish your version of this file to be governed by only the CDDL or
026: * only the GPL Version 2, indicate your decision by adding "[Contributor]
027: * elects to include this software in this distribution under the [CDDL or GPL
028: * Version 2] license." If you don't indicate a single choice of license, a
029: * recipient has the option to distribute your version of this file under
030: * either the CDDL, the GPL Version 2 or to extend the choice of license to
031: * its licensees as provided above. However, if you add GPL Version 2 code
032: * and therefore, elected the GPL Version 2 license, then the option applies
033: * only if the new code is made subject to such option by the copyright
034: * holder.
035: */
036:
037: package com.sun.xml.ws.policy;
038:
039: import com.sun.xml.ws.policy.privateutil.PolicyUtils;
040: import java.util.ArrayList;
041: import java.util.Collection;
042: import java.util.LinkedList;
043:
044: /**
045: * Merge policies and return the effective policy.
046: *
047: * WS-PolicyAttachment defines a merge algorithm for WSDL 1.1 policy attachments.
048: */
049: public final class PolicyMerger {
050: private static final PolicyMerger merger = new PolicyMerger();
051:
052: /**
053: * This private constructor is to avoid direct class instantiation from outsied of the package
054: */
055: private PolicyMerger() {
056: // nothing to instantiate
057: }
058:
059: /**
060: * Factory method for obtaining thread-safe policy merger instance.
061: *
062: * @return policy merger instance.
063: */
064: public static PolicyMerger getMerger() {
065: return merger;
066: }
067:
068: /**
069: * Takes collection of policies and merges them into a single policy using algorithm described in
070: * WS-PolicyAttachment specification. None of the original policis in the collection is modified in
071: * any way.
072: *
073: * @param policies collection of policies to be merged. The collection must not contain '{@code null}' elements!
074: * @return merged policy containing combination of policy alternatives stored in all input policies.
075: * If provided collection of policies is {@code null} or empty, returns {@code null}. If provided
076: * collection of policies contains only single policy, the policy is returned.
077: */
078: public Policy merge(final Collection<Policy> policies) {
079: if (policies == null || policies.isEmpty()) {
080: return null;
081: } else if (policies.size() == 1) {
082: return policies.iterator().next();
083: }
084:
085: final Collection<Collection<AssertionSet>> alternativeSets = new LinkedList<Collection<AssertionSet>>();
086: for (Policy policy : policies) {
087: alternativeSets.add(policy.getContent());
088: }
089:
090: final Collection<Collection<AssertionSet>> combinedAlternatives = PolicyUtils.Collections
091: .combine(null, alternativeSets, false);
092:
093: if (combinedAlternatives == null
094: || combinedAlternatives.isEmpty()) {
095: return Policy.createNullPolicy();
096: } else {
097: final Collection<AssertionSet> mergedSetList = new ArrayList<AssertionSet>(
098: combinedAlternatives.size());
099: for (Collection<AssertionSet> toBeMerged : combinedAlternatives) {
100: mergedSetList.add(AssertionSet
101: .createMergedAssertionSet(toBeMerged));
102: }
103: return Policy.createPolicy(mergedSetList);
104: }
105: }
106: }
|