/*
 * 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 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.builders.AssertionBuilder;
import org.apache.ws.secpolicy.Constants;
import org.apache.ws.secpolicy.model.SecurityContextToken;

public class SecurityContextTokenBuilder implements AssertionBuilder {

    public Assertion build(OMElement element, AssertionBuilderFactory factory)
            throws IllegalArgumentException {

        SecurityContextToken contextToken = new SecurityContextToken();

        OMAttribute attribute = element.getAttribute(Constants.INCLUDE_TOKEN);
        if (attribute == null) {
            throw new IllegalArgumentException(
                    "SecurityContextToken doesn't contain any sp:IncludeToken attribute");
        }
        
        String inclusionValue = attribute.getAttributeValue().trim();
        
        if (inclusionValue.endsWith(Constants.INCLUDE_NEVER)) {
            contextToken.setInclusion(Constants.INCLUDE_NEVER);

        } else if (inclusionValue.endsWith(Constants.INCLUDE_ONCE)) {
            contextToken.setInclusion(Constants.INCLUDE_ONCE);

        } else if (inclusionValue
                .endsWith(Constants.INCLUDE_ALWAYS_TO_RECIPIENT)) {
            contextToken.setInclusion(Constants.INCLUDE_ALWAYS_TO_RECIPIENT);

        } else if (inclusionValue.endsWith(Constants.INCLUDE_ALWAYS)) {
            contextToken.setInclusion(Constants.INCLUDE_ALWAYS);
        }

        element = element.getFirstChildWithName(Constants.POLICY);

        if (element != null) {

            if (element.getFirstChildWithName(Constants.REQUIRE_DERIVED_KEYS) != null) {
                contextToken.setDerivedKeys(true);
            }

            if (element
                    .getFirstChildWithName(Constants.REQUIRE_EXTERNAL_URI_REFERNCE) != null) {
                contextToken.setRequireExternalUriRef(true);
            }

            if (element
                    .getFirstChildWithName(Constants.SC10_SECURITY_CONTEXT_TOKEN) != null) {
                contextToken.setSc10SecurityContextToken(true);
            }
        }

        return contextToken;
    }

    public QName[] getKnownElements() {
        return new QName[] {Constants.SECURE_CONVERSATION_TOKEN};
    }

}