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/*
 * 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 javax.xml.soap;

import javax.xml.transform.Source;
import java.util.Iterator;

/**
 * The container for the SOAP-specific portion of a 
 * SOAPMessage object. All messages are required to have a
 * SOAP part, so when a SOAPMessage object is
 * created, it will automatically have a SOAPPart
 * object.
 *
 * A SOAPPart object is a MIME part and has the
 * MIME headers Content-Id, Content-Location, and Content-Type.
 * Because the value of Content-Type must be "text/xml", a 
 * SOAPPart object automatically has a MIME header of
 * Content-Type with its value set to "text/xml". The value must
 * be "text/xml" because content in the SOAP part of a message
 * must be in XML format. Content that is not of type "text/xml"
 * must be in an AttachmentPart object rather than in
 * the SOAPPart object.
 *
 * When a message is sent, its SOAP part must have the MIME
 * header Content-Type set to "text/xml". Or, from the other
 * perspective, the SOAP part of any message that is received must
 * have the MIME header Content-Type with a value of
 * "text/xml".
 *
 * A client can access the SOAPPart object of a
 * SOAPMessage object by calling the method 
 * SOAPMessage.getSOAPPart. The following line of code, in
 * which message is a SOAPMessage
 * object, retrieves the SOAP part of a message.
 *  * SOAPPart soapPart = message.getSOAPPart();
 * 
 *
 * A SOAPPart object contains a 
 * SOAPEnvelope object, which in turn contains a 
 * SOAPBody object and a SOAPHeader object.
 * The SOAPPart method getEnvelope can
 * be used to retrieve the SOAPEnvelope object.
 */
public abstract class SOAPPart implements org.w3c.dom.Document {

    public SOAPPart() {}

    /**
     * Gets the SOAPEnvelope object associated with
     * this SOAPPart object. Once the SOAP envelope is
     * obtained, it can be used to get its contents.
     * @return the SOAPEnvelope object for this 
     *     SOAPPart object
     * @throws  SOAPException if there is a SOAP error
     */
    public abstract SOAPEnvelope getEnvelope() throws SOAPException;

    /**
     * Retrieves the value of the MIME header whose name is
     * "Content-Id".
     * @return  a String giving the value of the MIME
     *     header named "Content-Id"
     * @see #setContentId(java.lang.String) setContentId(java.lang.String)
     */
    public String getContentId() {

        String as[] = getMimeHeader("Content-Id");

        if (as != null && as.length > 0) {
            return as[0];
        } else {
            return null;
        }
    }

    /**
     * Retrieves the value of the MIME header whose name is
     * "Content-Location".
     * @return a String giving the value of the MIME
     *     header whose name is "Content-Location"
     * @see #setContentLocation(java.lang.String) setContentLocation(java.lang.String)
     */
    public String getContentLocation() {

        String as[] = getMimeHeader("Content-Location");

        if (as != null && as.length > 0) {
            return as[0];
        } else {
            return null;
        }
    }

    /**
     * Sets the value of the MIME header named "Content-Id" to
     * the given String.
     * @param  contentId  a String giving
     *     the value of the MIME header "Content-Id"
     * @throws java.lang.IllegalArgumentException if
     *     there is a problem in setting the content id
     * @see #getContentId() getContentId()
     */
    public void setContentId(String contentId) {
        setMimeHeader("Content-Id", contentId);
    }

    /**
     * Sets the value of the MIME header "Content-Location" to
     * the given String.
     * @param  contentLocation a String
     *     giving the value of the MIME header
     *     "Content-Location"
     * @throws java.lang.IllegalArgumentException if
     *     there is a problem in setting the content location.
     * @see #getContentLocation() getContentLocation()
     */
    public void setContentLocation(String contentLocation) {
        setMimeHeader("Content-Location", contentLocation);
    }

    /**
     * Removes all MIME headers that match the given name.
     * @param  header  a String giving
     *     the name of the MIME header(s) to be removed
     */
    public abstract void removeMimeHeader(String header);

    /**
     * Removes all the MimeHeader objects for this
     * SOAPEnvelope object.
     */
    public abstract void removeAllMimeHeaders();

    /**
     * Gets all the values of the MimeHeader object
     * in this SOAPPart object that is identified by
     * the given String.
     * @param   name  the name of the header; example:
     *     "Content-Type"
     * @return a String array giving all the values for
     *     the specified header
     * @see #setMimeHeader(java.lang.String, java.lang.String) setMimeHeader(java.lang.String, java.lang.String)
     */
    public abstract String[] getMimeHeader(String name);

    /**
     * Changes the first header entry that matches the given
     *   header name so that its value is the given value, adding a
     *   new header with the given name and value if no existing
     *   header is a match. If there is a match, this method clears
     *   all existing values for the first header that matches and
     *   sets the given value instead. If more than one header has
     *   the given name, this method removes all of the matching
     *   headers after the first one.
     *
     *   Note that RFC822 headers can contain only US-ASCII
     *   characters.
     * @param  name a String giving the
     *     header name for which to search
     * @param  value a String giving the
     *     value to be set. This value will be substituted for the
     *     current value(s) of the first header that is a match if
     *     there is one. If there is no match, this value will be
     *     the value for a new MimeHeader object.
     * @throws java.lang.IllegalArgumentException if
     *     there was a problem with the specified mime header name
     *     or value
     * @throws java.lang.IllegalArgumentException if there was a problem with the specified mime header name or value
     * @see #getMimeHeader(java.lang.String) getMimeHeader(java.lang.String)
     */
    public abstract void setMimeHeader(String name, String value);

    /**
     *  Creates a MimeHeader object with the specified
     *   name and value and adds it to this SOAPPart
     *   object. If a MimeHeader with the specified
     *   name already exists, this method adds the specified value
     *   to the already existing value(s).
     *
     *   Note that RFC822 headers can contain only US-ASCII
     *   characters.
     *
     * @param  name a String giving the
     *     header name
     * @param  value a String giving the
     *     value to be set or added
     * @throws java.lang.IllegalArgumentException if
     * there was a problem with the specified mime header name
     *     or value
     */
    public abstract void addMimeHeader(String name, String value);

    /**
     * Retrieves all the headers for this SOAPPart
     * object as an iterator over the MimeHeader
     * objects.
     * @return an Iterator object with all of the Mime
     *     headers for this SOAPPart object
     */
    public abstract Iterator getAllMimeHeaders();

    /**
     * Retrieves all MimeHeader objects that match
     * a name in the given array.
     * @param   names a String array with
     *     the name(s) of the MIME headers to be returned
     * @return all of the MIME headers that match one of the names
     *     in the given array, returned as an Iterator
     *     object
     */
    public abstract Iterator getMatchingMimeHeaders(String names[]);

    /**
     * Retrieves all MimeHeader objects whose name
     * does not match a name in the given array.
     * @param   names a String array with
     *     the name(s) of the MIME headers not to be returned
     * @return all of the MIME headers in this SOAPPart
     *     object except those that match one of the names in the
     *     given array. The nonmatching MIME headers are returned as
     *     an Iterator object.
     */
    public abstract Iterator getNonMatchingMimeHeaders(String names[]);

    /**
     * Sets the content of the SOAPEnvelope object
     * with the data from the given Source object.
     * @param   source javax.xml.transform.Source object with the data to
     *     be set
     * @throws  SOAPException if there is a problem in
     *     setting the source
     * @see #getContent() getContent()
     */
    public abstract void setContent(Source source) throws SOAPException;

    /**
     * Returns the content of the SOAPEnvelope as a JAXP 
     * Source object.
     * @return the content as a 
     *     javax.xml.transform.Source object
     * @throws  SOAPException  if the implementation cannot
     *     convert the specified Source object
     * @see #setContent(javax.xml.transform.Source) setContent(javax.xml.transform.Source)
     */
    public abstract Source getContent() throws SOAPException;
}