/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ws.secpolicy.builders;

import java.util.Iterator;
import java.util.List;

import javax.xml.namespace.QName;

import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMElement;
import org.apache.neethi.Assertion;
import org.apache.neethi.AssertionBuilderFactory;
import org.apache.neethi.Policy;
import org.apache.neethi.PolicyEngine;
import org.apache.neethi.builders.AssertionBuilder;
import org.apache.ws.secpolicy.Constants;
import org.apache.ws.secpolicy.model.UsernameToken;

public class UsernameTokenBuilder implements AssertionBuilder {

    
    public Assertion build(OMElement element, AssertionBuilderFactory factory) throws IllegalArgumentException {
        UsernameToken usernameToken = new UsernameToken();
        
        OMAttribute attribute = element.getAttribute(Constants.INCLUDE_TOKEN);
        if(attribute != null) {
            usernameToken.setInclusion(attribute.getAttributeValue());
        }
        
        OMElement policyElement = element.getFirstElement();
        
        if (policyElement != null && !policyElement.getQName().equals(org.apache.neethi.Constants.Q_ELEM_POLICY)) {
        
            Policy policy = PolicyEngine.getPolicy(element.getFirstElement());
            policy = (Policy) policy.normalize(false);
            
            for (Iterator iterator = policy.getAlternatives(); iterator.hasNext();) {
                processAlternative((List) iterator.next(), usernameToken);
                
                /*
                 * since there should be only one alternative
                 */
                break;
            }            
        }
        
        return usernameToken;
    }
        
    public QName[] getKnownElements() {
        return new QName[] {Constants.USERNAME_TOKEN};
    }

    private void processAlternative(List assertions, UsernameToken parent) {
                
        for (Iterator iterator = assertions.iterator(); iterator.hasNext();) {
            Assertion assertion = (Assertion) iterator.next();
            QName qname = assertion.getName();
            
            if (Constants.WSS_USERNAME_TOKEN10.equals(qname)) {
                parent.setUseUTProfile10(true);
                
            } else if (Constants.WSS_USERNAME_TOKEN11.equals(qname)) {
                parent.setUseUTProfile11(true);
            }
        }
    }
}