jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/ws/policy/PolicyMerger.java@e530533619ec

     1 /*

     2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package com.sun.xml.internal.ws.policy;

    28 import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;

    29 import com.sun.xml.internal.ws.policy.sourcemodel.wspolicy.NamespaceVersion;

    30 import java.util.ArrayList;

    31 import java.util.Collection;

    32 import java.util.LinkedList;

    34 /**

    35  * Merge policies and return the effective policy.

    36  *

    37  * WS-PolicyAttachment defines a merge algorithm for WSDL 1.1 policy attachments.

    38  */

    39 public final class PolicyMerger {

    40     private static final PolicyMerger merger = new PolicyMerger();

    42     /**

    43      * This private constructor is to avoid direct class instantiation from outsied of the package

    44      */

    45     private PolicyMerger() {

    46         // nothing to instantiate

    47     }

    49     /**

    50      * Factory method for obtaining thread-safe policy merger instance.

    51      *

    52      * @return policy merger instance.

    53      */

    54     public static PolicyMerger getMerger() {

    55         return merger;

    56     }

    58     /**

    59      * Takes collection of policies and merges them into a single policy using algorithm described in

    60      * WS-PolicyAttachment specification. None of the original policies in the collection are modified in

    61      * any way.

    62      *

    63      * The newly created policy has an ID that is a concatentation of all merged policy IDs.

    64      *

    65      * @param policies collection of policies to be merged. The collection must not contain '{@code null}' elements!

    66      * @return merged policy containing combination of policy alternatives stored in all input policies.

    67      *         If provided collection of policies is {@code null} or empty, returns {@code null}. If provided

    68      *         collection of policies contains only single policy, the policy is returned.

    69      */

    70     public Policy merge(final Collection<Policy> policies) {

    71         if (policies == null || policies.isEmpty()) {

    72             return null;

    73         } else if (policies.size() == 1) {

    74             return policies.iterator().next();

    75         }

    77         final Collection<Collection<AssertionSet>> alternativeSets = new LinkedList<Collection<AssertionSet>>();

    78         final StringBuilder id = new StringBuilder();

    79         NamespaceVersion mergedVersion = policies.iterator().next().getNamespaceVersion();

    80         for (Policy policy : policies) {

    81             alternativeSets.add(policy.getContent());

    82             if (mergedVersion.compareTo(policy.getNamespaceVersion()) < 0) {

    83                 mergedVersion = policy.getNamespaceVersion();

    84             }

    85             final String policyId = policy.getId();

    86             if (policyId != null) {

    87                 if (id.length() > 0) {

    88                     id.append('-');

    89                 }

    90                 id.append(policyId);

    91             }

    92         }

    94         final Collection<Collection<AssertionSet>> combinedAlternatives = PolicyUtils.Collections.combine(null, alternativeSets, false);

    96         if (combinedAlternatives == null || combinedAlternatives.isEmpty()) {

    97             return Policy.createNullPolicy(mergedVersion, null, id.length() == 0 ? null : id.toString());

    98         } else {

    99             final Collection<AssertionSet> mergedSetList = new ArrayList<AssertionSet>(combinedAlternatives.size());

   100             for (Collection<AssertionSet> toBeMerged : combinedAlternatives) {

   101                 mergedSetList.add(AssertionSet.createMergedAssertionSet(toBeMerged));

   102             }

   103             return Policy.createPolicy(mergedVersion, null, id.length() == 0 ? null : id.toString(), mergedSetList);

   104         }

   105     }

   106 }

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