107 lines
4.5 KiB
Java
107 lines
4.5 KiB
Java
/*
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* Copyright (c) 1997, 2010, 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 com.sun.xml.internal.ws.policy;
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import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;
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import com.sun.xml.internal.ws.policy.sourcemodel.wspolicy.NamespaceVersion;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.LinkedList;
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/**
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* Merge policies and return the effective policy.
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*
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* WS-PolicyAttachment defines a merge algorithm for WSDL 1.1 policy attachments.
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*/
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public final class PolicyMerger {
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private static final PolicyMerger merger = new PolicyMerger();
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/**
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* This private constructor is to avoid direct class instantiation from outsied of the package
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*/
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private PolicyMerger() {
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// nothing to instantiate
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}
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/**
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* Factory method for obtaining thread-safe policy merger instance.
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*
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* @return policy merger instance.
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*/
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public static PolicyMerger getMerger() {
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return merger;
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}
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/**
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* Takes collection of policies and merges them into a single policy using algorithm described in
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* WS-PolicyAttachment specification. None of the original policies in the collection are modified in
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* any way.
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*
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* The newly created policy has an ID that is a concatentation of all merged policy IDs.
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*
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* @param policies collection of policies to be merged. The collection must not contain '{@code null}' elements!
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* @return merged policy containing combination of policy alternatives stored in all input policies.
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* If provided collection of policies is {@code null} or empty, returns {@code null}. If provided
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* collection of policies contains only single policy, the policy is returned.
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*/
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public Policy merge(final Collection<Policy> policies) {
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if (policies == null || policies.isEmpty()) {
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return null;
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} else if (policies.size() == 1) {
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return policies.iterator().next();
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}
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final Collection<Collection<AssertionSet>> alternativeSets = new LinkedList<Collection<AssertionSet>>();
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final StringBuilder id = new StringBuilder();
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NamespaceVersion mergedVersion = policies.iterator().next().getNamespaceVersion();
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for (Policy policy : policies) {
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alternativeSets.add(policy.getContent());
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if (mergedVersion.compareTo(policy.getNamespaceVersion()) < 0) {
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mergedVersion = policy.getNamespaceVersion();
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}
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final String policyId = policy.getId();
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if (policyId != null) {
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if (id.length() > 0) {
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id.append('-');
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}
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id.append(policyId);
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}
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}
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final Collection<Collection<AssertionSet>> combinedAlternatives = PolicyUtils.Collections.combine(null, alternativeSets, false);
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if (combinedAlternatives == null || combinedAlternatives.isEmpty()) {
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return Policy.createNullPolicy(mergedVersion, null, id.length() == 0 ? null : id.toString());
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} else {
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final Collection<AssertionSet> mergedSetList = new ArrayList<AssertionSet>(combinedAlternatives.size());
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for (Collection<AssertionSet> toBeMerged : combinedAlternatives) {
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mergedSetList.add(AssertionSet.createMergedAssertionSet(toBeMerged));
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}
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return Policy.createPolicy(mergedVersion, null, id.length() == 0 ? null : id.toString(), mergedSetList);
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}
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}
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}
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