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/*
 * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.ws.encoding.policy;

import com.sun.xml.ws.api.WSBinding;
import com.sun.xml.ws.api.model.SEIModel;
import com.sun.xml.ws.policy.AssertionSet;
import com.sun.xml.ws.policy.Policy;
import com.sun.xml.ws.policy.PolicyAssertion;
import com.sun.xml.ws.policy.PolicyException;
import com.sun.xml.ws.policy.PolicyMap;
import com.sun.xml.ws.policy.PolicySubject;
import com.sun.xml.ws.policy.jaxws.spi.PolicyMapConfigurator;
import com.sun.xml.ws.policy.privateutil.PolicyLogger;
import com.sun.xml.ws.policy.sourcemodel.AssertionData;
import com.sun.xml.ws.policy.subject.WsdlBindingSubject;

import java.util.ArrayList;
import java.util.Collection;
import java.util.logging.Level;
import javax.xml.namespace.QName;
import jakarta.xml.ws.soap.MTOMFeature;

/**
 * Generate an MTOM policy if MTOM was enabled.
 *
 * @author Jakub Podlesak (japod at sun.com)
 * @author Fabian Ritzmann
 */
public class MtomPolicyMapConfigurator implements PolicyMapConfigurator {
    
    private static final PolicyLogger LOGGER = PolicyLogger.getLogger(MtomPolicyMapConfigurator.class);

    /**
     * Default constructor.
     */
    public MtomPolicyMapConfigurator() {}

    static class MtomAssertion extends PolicyAssertion {

        private static final AssertionData mtomData;
        static {
            mtomData= AssertionData.createAssertionData(EncodingConstants.OPTIMIZED_MIME_SERIALIZATION_ASSERTION);
            //JAX-WS MTOMFeature does n't currently capture if MTOM is required/optional.
            //JAX-WS accepts both normal messages and XOP encoded messages. Using wsp:Optional=true represents that behavior.
            //Moreover, this allows interoperability with non-MTOM aware clients.
            //See https://wsit.dev.java.net/issues/show_bug.cgi?id=1062
            mtomData.setOptionalAttribute(true);
        }

        MtomAssertion() {
            super(mtomData, null);

        }
    }
    
    /**
     * Generates an MTOM policy if MTOM is enabled.
     *
     * 
     * If MTOM is enabled
     * 
     * If MTOM policy does not already exist, generate
     * 
Otherwise do nothing
     * 
     * 
Otherwise, do nothing (that implies that we do not remove any MTOM policies if MTOM is disabled)
     * 
     *
     */
    @Override
    public Collection update(PolicyMap policyMap, SEIModel model, WSBinding wsBinding) throws PolicyException {
        LOGGER.entering(policyMap, model, wsBinding);

        Collection subjects = new ArrayList<>();
        if (policyMap != null) {
            final MTOMFeature mtomFeature = wsBinding.getFeature(MTOMFeature.class);
            if (LOGGER.isLoggable(Level.FINEST)) {
                LOGGER.finest("mtomFeature = " + mtomFeature);
            }
            if ((mtomFeature != null) && mtomFeature.isEnabled()) {
                final QName bindingName = model.getBoundPortTypeName();
                final WsdlBindingSubject wsdlSubject = WsdlBindingSubject.createBindingSubject(bindingName);
                final Policy mtomPolicy = createMtomPolicy(bindingName);
                final PolicySubject mtomPolicySubject = new PolicySubject(wsdlSubject, mtomPolicy);
                subjects.add(mtomPolicySubject);
                if (LOGGER.isLoggable(Level.FINEST)) {
                    LOGGER.fine("Added MTOM policy with ID \"" + mtomPolicy.getIdOrName() + "\" to binding element \"" + bindingName + "\"");
                }
            }
        } // endif policy map not null
        
        LOGGER.exiting(subjects);
        return subjects;
    }
    
    
    /**
     * Create a policy with an MTOM assertion.
     *
     * @param bindingName The binding element name. Used to generate a (locally) unique ID for the policy.
     * @return The policy.
     */
    private Policy createMtomPolicy(final QName bindingName) {
        ArrayList assertionSets = new ArrayList<>(1);
        ArrayList assertions = new ArrayList<>(1);
        assertions.add(new MtomAssertion());
        assertionSets.add(AssertionSet.createAssertionSet(assertions));
        return Policy.createPolicy(null, bindingName.getLocalPart() + "_MTOM_Policy", assertionSets);
    }
    
}