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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.security.impl.policy;

import com.sun.xml.ws.policy.AssertionSet;
import com.sun.xml.ws.policy.PolicyAssertion;
import com.sun.xml.ws.policy.sourcemodel.AssertionData;
import com.sun.xml.ws.security.policy.SecurityAssertionValidator;
import com.sun.xml.ws.security.policy.SecurityPolicyVersion;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.namespace.QName;

/**
 *
 * @author [email protected]
 */
public class RequiredElements extends PolicyAssertion implements com.sun.xml.ws.security.policy.RequiredElements, SecurityAssertionValidator {

    private String xpathVersion;
    private List targetList;
    private boolean populated = false;
    private static QName XPathVersion = new QName("XPathVersion");
    private AssertionFitness fitness = AssertionFitness.IS_VALID;
    private SecurityPolicyVersion spVersion;
    /** Creates a new instance of RequiredElements */
    public RequiredElements() {
        spVersion = SecurityPolicyVersion.SECURITYPOLICY200507;
    }

    public RequiredElements(AssertionData name,Collection nestedAssertions, AssertionSet nestedAlternative) {
        super(name,nestedAssertions,nestedAlternative);
        String nsUri = getName().getNamespaceURI();
        if(SecurityPolicyVersion.SECURITYPOLICY200507.namespaceUri.equals(nsUri)){
            spVersion = SecurityPolicyVersion.SECURITYPOLICY200507;
        } else if(SecurityPolicyVersion.SECURITYPOLICY12NS.namespaceUri.equals(nsUri)){
            spVersion = SecurityPolicyVersion.SECURITYPOLICY12NS;
        }
    }

    @Override
    public String getXPathVersion() {
        populate();
        return xpathVersion;
    }

    public void setXPathVersion(String version) {
        this.xpathVersion = version;
    }

    public void addTarget(String target) {
        if ( targetList == null ) {
            targetList = new ArrayList<>();
        }
        targetList.add(target);
    }

    public void removeTarget(String target) {
        if ( targetList != null ) {
            targetList.remove(target);
        }
    }

    @Override
    public Iterator getTargets() {
        populate();
        if ( targetList != null ) {
            return targetList.iterator();
        }
        return Collections.emptyList().iterator();
    }


    @Override
    public AssertionFitness validate(boolean isServer) {
        return populate(isServer);
    }
    private void populate(){
        populate(false);
    }

    private synchronized AssertionFitness populate(boolean isServer) {
        if(!populated){
            this.xpathVersion = this.getAttributeValue(XPathVersion);
            if ( this.hasParameters() ) {
                Iterator  it = this.getParametersIterator();
                if ( it.hasNext() ) {
                    PolicyAssertion assertion = it.next();
                    if ( PolicyUtil.isXPath(assertion, spVersion)) {
                        addTarget(assertion.getValue());
                    } else{
                        if(!assertion.isOptional()){
                            Constants.log_invalid_assertion(assertion, isServer, Constants.RequiredElements);
                            fitness = AssertionFitness.HAS_UNKNOWN_ASSERTION;
                        }
                    }
                }
            }
            populated = true;
        }
        return fitness;
    }
}