/*
 * Copyright 2005-2011 the original author or authors.
 *
 * 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.springframework.ws.soap;

import java.util.Iterator;
import javax.xml.namespace.QName;
import javax.xml.transform.Result;

/**
 * Represents the {@code Header} element in a SOAP message. A SOAP header contains {@code SoapHeaderElement}s,
 * which represent the individual headers.
 *
 * @author Arjen Poutsma
 * @see SoapHeaderElement
 * @see SoapEnvelope#getHeader()
 * @since 1.0.0
 */
public interface SoapHeader extends SoapElement {

	/**
	 * Returns a {@code Result} that represents the contents of the header.
	 *
	 * <p>The result can be used for marshalling.
	 *
	 * @return the {@code Result} of this element
	 */
	Result getResult();

	/**
	 * Adds a new {@code SoapHeaderElement} with the specified qualified name to this header.
	 *
	 * @param name the qualified name of the new header element
	 * @return the created {@code SoapHeaderElement}
	 * @throws SoapHeaderException if the header cannot be created
	 */
	SoapHeaderElement addHeaderElement(QName name) throws SoapHeaderException;

	/**
	 * Removes the {@code SoapHeaderElement} with the specified qualified name from this header.
	 *
	 * <p>This method will only remove the first child element with the specified name. If no element is found with the
	 * specified name, this method has no effect.
	 *
	 * @param name the qualified name of the header element to be removed
	 * @throws SoapHeaderException if the header cannot be removed
	 */
	void removeHeaderElement(QName name) throws SoapHeaderException;

	/**
	 * Returns an {@code Iterator} over all the {@code SoapHeaderElement}s that have the specified actor or
	 * role and that have a {@code MustUnderstand} attribute whose value is equivalent to {@code true}.
	 *
	 * @param actorOrRole the actor (SOAP 1.1) or role (SOAP 1.2) for which to search
	 * @return an iterator over all the header elements that contain the specified actor/role and are marked as
	 *		   {@code MustUnderstand}
	 * @throws SoapHeaderException if the headers cannot be returned
	 * @see SoapHeaderElement
	 */
	Iterator<SoapHeaderElement> examineMustUnderstandHeaderElements(String actorOrRole) throws SoapHeaderException;

	/**
	 * Returns an {@code Iterator} over all the {@code SoapHeaderElement}s in this header.
	 *
	 * @return an iterator over all the header elements
	 * @throws SoapHeaderException if the header cannot be returned
	 * @see SoapHeaderElement
	 */
	Iterator<SoapHeaderElement> examineAllHeaderElements() throws SoapHeaderException;
	
	/**
	 * Returns an {@code Iterator} over all the {@code SoapHeaderElement}s with the given qualified name in this header.
	 *
	 * @param name the qualified name for which to search
	 * @return an iterator over all the header elements
	 * @throws SoapHeaderException if the header cannot be returned
	 * @see SoapHeaderElement
	 * @since 2.0.3
	 */
	Iterator<SoapHeaderElement> examineHeaderElements(QName name) throws SoapHeaderException;

}