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JDK 1.6
  javax.xml.soap. SOAPMessage View Javadoc
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/*
 * $Id: SOAPMessage.java,v 1.21 2005/06/21 17:49:12 mk125090 Exp $
 * $Revision: 1.21 $
 * $Date: 2005/06/21 17:49:12 $
 */

/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. SUN
 * PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package javax.xml.soap;
import java.io.OutputStream;
import java.io.IOException;

import java.util.Iterator;

import javax.activation.DataHandler;

/**
 * The root class for all SOAP messages. As transmitted on the "wire", a SOAP
 * message is an XML document or a MIME message whose first body part is an
 * XML/SOAP document.
 * <P>
 * A <code>SOAPMessage</code> object consists of a SOAP part and optionally
 * one or more attachment parts. The SOAP part for a <code>SOAPMessage</code>
 * object is a <code>SOAPPart</code> object, which contains information used
 * for message routing and identification, and which can contain
 * application-specific content. All data in the SOAP Part of a message must be
 * in XML format.
 * <P>
 * A new <code>SOAPMessage</code> object contains the following by default:
 * <UL>
 *   <LI>A <code>SOAPPart</code> object
 *   <LI>A <code>SOAPEnvelope</code> object
 *   <LI>A <code>SOAPBody</code> object
 *   <LI>A <code>SOAPHeader</code> object
 * </UL>
 * The SOAP part of a message can be retrieved by calling the method <code>SOAPMessage.getSOAPPart()</code>.
 * The <code>SOAPEnvelope</code> object is retrieved from the <code>SOAPPart</code>
 * object, and the <code>SOAPEnvelope</code> object is used to retrieve the
 * <code>SOAPBody</code> and <code>SOAPHeader</code> objects.
 *
 * <PRE>
 *     SOAPPart sp = message.getSOAPPart();
 *     SOAPEnvelope se = sp.getEnvelope();
 *     SOAPBody sb = se.getBody();
 *     SOAPHeader sh = se.getHeader();
 * </PRE>
 *
 * <P>
 * In addition to the mandatory <code>SOAPPart</code> object, a <code>SOAPMessage</code>
 * object may contain zero or more <code>AttachmentPart</code> objects, each
 * of which contains application-specific data. The <code>SOAPMessage</code>
 * interface provides methods for creating <code>AttachmentPart</code>
 * objects and also for adding them to a <code>SOAPMessage</code> object. A
 * party that has received a <code>SOAPMessage</code> object can examine its
 * contents by retrieving individual attachment parts.
 * <P>
 * Unlike the rest of a SOAP message, an attachment is not required to be in
 * XML format and can therefore be anything from simple text to an image file.
 * Consequently, any message content that is not in XML format must be in an
 * <code>AttachmentPart</code> object.
 * <P>
 * A <code>MessageFactory</code> object may create <code>SOAPMessage</code>
 * objects with behavior that is specialized to a particular implementation or
 * application of SAAJ. For instance, a <code>MessageFactory</code> object
 * may produce <code>SOAPMessage</code> objects that conform to a particular
 * Profile such as ebXML. In this case a <code>MessageFactory</code> object
 * might produce <code>SOAPMessage</code> objects that are initialized with
 * ebXML headers.
 * <P>
 * In order to ensure backward source compatibility, methods that are added to
 * this class after version 1.1 of the SAAJ specification are all concrete
 * instead of abstract and they all have default implementations. Unless
 * otherwise noted in the JavaDocs for those methods the default
 * implementations simply throw an <code>UnsupportedOperationException</code>
 * and the SAAJ implementation code must override them with methods that
 * provide the specified behavior. Legacy client code does not have this
 * restriction, however, so long as there is no claim made that it conforms to
 * some later version of the specification than it was originally written for.
 * A legacy class that extends the SOAPMessage class can be compiled and/or run
 * against succeeding versions of the SAAJ API without modification. If such a
 * class was correctly implemented then it will continue to behave correctly
 * relative to the version of the specification against which it was written.
 *
 * @see MessageFactory
 * @see AttachmentPart
 */
public abstract class SOAPMessage {
    /**
	 * Specifies the character type encoding for the SOAP Message. Valid values
	 * include "utf-8" and "utf-16". See vendor documentation for additional
	 * supported values. The default is "utf-8".
	 *
	 * @see SOAPMessage#setProperty(String, Object) SOAPMessage.setProperty
	 * @since SAAJ 1.2
	 */
    public static final String CHARACTER_SET_ENCODING =
        "javax.xml.soap.character-set-encoding";

    /**
     * Specifies whether the SOAP Message will contain an XML declaration when
     * it is sent. The only valid values are "true" and "false". The default is
     * "false".
     *
     * @see SOAPMessage#setProperty(String, Object) SOAPMessage.setProperty
     * @since SAAJ 1.2
     */
    public static final String WRITE_XML_DECLARATION =
        "javax.xml.soap.write-xml-declaration";

    /**
     * Sets the description of this <code>SOAPMessage</code> object's
     * content with the given description.
     *
     * @param description a <code>String</code> describing the content of this
     *         message
     * @see #getContentDescription
     */
    public abstract void setContentDescription(String description);

    /**
     * Retrieves a description of this <code>SOAPMessage</code> object's
     * content.
     *
     * @return a <code>String</code> describing the content of this
     *         message or <code>null</code> if no description has been set
     * @see #setContentDescription
     */
    public abstract String getContentDescription();

    /**
	 * Gets the SOAP part of this <code>SOAPMessage</code> object.
	 * <P>
	 * <code>SOAPMessage</code> object contains one or more attachments, the
	 * SOAP Part must be the first MIME body part in the message.
	 *
	 * @return the <code>SOAPPart</code> object for this <code>SOAPMessage</code>
	 *         object
	 */
    public abstract SOAPPart getSOAPPart();

    /**
	 * Gets the SOAP Body contained in this <code>SOAPMessage</code> object.
	 * <p>
	 *
	 * @return the <code>SOAPBody</code> object contained by this <code>SOAPMessage</code>
	 *         object
	 * @exception SOAPException
	 *               if the SOAP Body does not exist or cannot be retrieved
	 * @since SAAJ 1.2
	 */
    public SOAPBody getSOAPBody() throws SOAPException {
        throw new UnsupportedOperationException("getSOAPBody must be overridden by all subclasses of SOAPMessage");
    }

    /**
	 * Gets the SOAP Header contained in this <code>SOAPMessage</code>
	 * object.
	 * <p>
	 *
	 * @return the <code>SOAPHeader</code> object contained by this <code>SOAPMessage</code>
	 *         object
	 * @exception SOAPException
	 *               if the SOAP Header does not exist or cannot be retrieved
	 * @since SAAJ 1.2
	 */
    public SOAPHeader getSOAPHeader() throws SOAPException {
        throw new UnsupportedOperationException("getSOAPHeader must be overridden by all subclasses of SOAPMessage");
    }

    /**
	 * Removes all <code>AttachmentPart</code> objects that have been added
	 * to this <code>SOAPMessage</code> object.
	 * <P>
	 * This method does not touch the SOAP part.
	 */
    public abstract void removeAllAttachments();

    /**
	 * Gets a count of the number of attachments in this message. This count
	 * does not include the SOAP part.
	 *
	 * @return the number of <code>AttachmentPart</code> objects that are
	 *         part of this <code>SOAPMessage</code> object
	 */
    public abstract int countAttachments();

    /**
	 * Retrieves all the <code>AttachmentPart</code> objects that are part of
	 * this <code>SOAPMessage</code> object.
	 *
	 * @return an iterator over all the attachments in this message
	 */
    public abstract Iterator getAttachments();

    /**
	 * Retrieves all the <code>AttachmentPart</code> objects that have header
	 * entries that match the specified headers. Note that a returned
	 * attachment could have headers in addition to those specified.
	 *
	 * @param headers
	 *           a <code>MimeHeaders</code> object containing the MIME
	 *           headers for which to search
	 * @return an iterator over all attachments that have a header that matches
	 *         one of the given headers
	 */
    public abstract Iterator getAttachments(MimeHeaders headers);

    /**
     * Removes all the <code>AttachmentPart</code> objects that have header
     * entries that match the specified headers. Note that the removed
     * attachment could have headers in addition to those specified.
     *
     * @param headers
     *           a <code>MimeHeaders</code> object containing the MIME
     *           headers for which to search
     * @since SAAJ 1.3
     */
    public abstract void removeAttachments(MimeHeaders headers);


    /**
     * Returns an <code>AttachmentPart</code> object that is associated with an
     * attachment that is referenced by this <code>SOAPElement</code> or
     * <code>null</code> if no such attachment exists. References can be made
     * via an <code>href</code> attribute as described in
     * {@link <a href="http://www.w3.org/TR/SOAP-attachments#SOAPReferenceToAttachements">SOAP Messages with Attachments</a>},
     * or via a single <code>Text</code> child node containing a URI as
     * described in the WS-I Attachments Profile 1.0 for elements of schema
     * type <i>ref:swaRef</i>({@link <a href=http://www.ws-i.org/Profiles/AttachmentsProfile-1.0-2004-08-24.html">ref:swaRef</a>}).  These two mechanisms must be supported.
     * The support for references via <code>href</code> attribute also implies that
     * this method should also be supported on an element that is an
     * <i>xop:Include</i> element (
     * {@link <a  href="http://www.w3.org/2000/xp/Group/3/06/Attachments/XOP.html">XOP</a>}).
     * other reference mechanisms may be supported by individual
     * implementations of this standard. Contact your vendor for details.
     *
     * @param  element The <code>SOAPElement</code> containing the reference to an Attachment
     * @return the referenced <code>AttachmentPart</code> or null if no such
     *          <code>AttachmentPart</code> exists or no reference can be
     *          found in this <code>SOAPElement</code>.
     * @throws SOAPException if there is an error in the attempt to access the
     *          attachment
     *
     * @since SAAJ 1.3
     */
    public abstract AttachmentPart getAttachment(SOAPElement element) throws SOAPException;


    /**
     * Adds the given <code>AttachmentPart</code> object to this <code>SOAPMessage</code>
     * object. An <code>AttachmentPart</code> object must be created before
     * it can be added to a message.
     *
     * @param AttachmentPart
     *           an <code>AttachmentPart</code> object that is to become part
     *           of this <code>SOAPMessage</code> object
     * @exception IllegalArgumentException
     */
    public abstract void addAttachmentPart(AttachmentPart AttachmentPart);

    /**
     * Creates a new empty <code>AttachmentPart</code> object. Note that the
     * method <code>addAttachmentPart</code> must be called with this new
     * <code>AttachmentPart</code> object as the parameter in order for it to
     * become an attachment to this <code>SOAPMessage</code> object.
     *
     * @return a new <code>AttachmentPart</code> object that can be populated
     *         and added to this <code>SOAPMessage</code> object
     */
    public abstract AttachmentPart createAttachmentPart();

    /**
     * Creates an <code>AttachmentPart</code> object and populates it using
     * the given <code>DataHandler</code> object.
     *
     * @param dataHandler
     *           the <code>javax.activation.DataHandler</code> object that
     *           will generate the content for this <code>SOAPMessage</code>
     *           object
     * @return a new <code>AttachmentPart</code> object that contains data
     *         generated by the given <code>DataHandler</code> object
     * @exception IllegalArgumentException
     *               if there was a problem with the specified <code>DataHandler</code>
     *               object
     * @see javax.activation.DataHandler
     * @see javax.activation.DataContentHandler
     */
    public AttachmentPart createAttachmentPart(DataHandler dataHandler) {
        AttachmentPart attachment = createAttachmentPart();
        attachment.setDataHandler(dataHandler);
        return attachment;
    }

    /**
     * Returns all the transport-specific MIME headers for this <code>SOAPMessage</code>
     * object in a transport-independent fashion.
     *
     * @return a <code>MimeHeaders</code> object containing the <code>MimeHeader</code>
     *         objects
     */
    public abstract MimeHeaders getMimeHeaders();

    /**
     * Creates an <code>AttachmentPart</code> object and populates it with
     * the specified data of the specified content type. The type of the
     * <code>Object</code> should correspond to the value given for the
     * <code>Content-Type</code>.
     *
     * @param content
     *           an <code>Object</code> containing the content for the
     *           <code>AttachmentPart</code> object to be created
     * @param contentType
     *           a <code>String</code> object giving the type of content;
     *           examples are "text/xml", "text/plain", and "image/jpeg"
     * @return a new <code>AttachmentPart</code> object that contains the
     *         given data
     * @exception IllegalArgumentException
     *               may be thrown if the contentType does not match the type 
     *               of the content object, or if there was no 
     *               <code>DataContentHandler</code> object for the given 
     *               content object
     * @see javax.activation.DataHandler
     * @see javax.activation.DataContentHandler
     */
    public AttachmentPart createAttachmentPart(
        Object content,
        String contentType) {
        AttachmentPart attachment = createAttachmentPart();
        attachment.setContent(content, contentType);
        return attachment;
    }

    /**
     * Updates this <code>SOAPMessage</code> object with all the changes that
     * have been made to it. This method is called automatically when
     * {@link SOAPMessage#writeTo(OutputStream)} is  called. However, if
     * changes are made to a message that was received or to one that has
     * already been sent, the method <code>saveChanges</code> needs to be
     * called explicitly in order to save the changes. The method <code>saveChanges</code>
     * also generates any changes that can be read back (for example, a
     * MessageId in profiles that support a message id). All MIME headers in a
     * message that is created for sending purposes are guaranteed to have
     * valid values only after <code>saveChanges</code> has been called.
     * <P>
     * In addition, this method marks the point at which the data from all
     * constituent <code>AttachmentPart</code> objects are pulled into the
     * message.
     * <P>
     *
     * @exception <code>SOAPException</code> if there was a problem saving
     *               changes to this message.
     */
    public abstract void saveChanges() throws SOAPException;

    /**
     * Indicates whether this <code>SOAPMessage</code> object needs to have
     * the method <code>saveChanges</code> called on it.
     *
     * @return <code>true</code> if <code>saveChanges</code> needs to be
     *         called; <code>false</code> otherwise.
     */
    public abstract boolean saveRequired();

    /**
     * Writes this <code>SOAPMessage</code> object to the given output
     * stream. The externalization format is as defined by the SOAP 1.1 with
     * Attachments specification.
     * <P>
     * If there are no attachments, just an XML stream is written out. For
     * those messages that have attachments, <code>writeTo</code> writes a
     * MIME-encoded byte stream.
     * <P>
     * Note that this method does not write the transport-specific MIME Headers 
     * of the Message
     *
     * @param out
     *           the <code>OutputStream</code> object to which this <code>SOAPMessage</code>
     *           object will be written
     * @exception IOException
     *               if an I/O error occurs
     * @exception SOAPException
     *               if there was a problem in externalizing this SOAP message
     */
    public abstract void writeTo(OutputStream out)
        throws SOAPException, IOException;

    /**
     * Associates the specified value with the specified property. If there was
     * already a value associated with this property, the old value is
     * replaced.
     * <p>
     * The valid property names include
     * {@link SOAPMessage#WRITE_XML_DECLARATION}  and
     * {@link SOAPMessage#CHARACTER_SET_ENCODING}. All of these standard SAAJ
     * properties are prefixed by "javax.xml.soap". Vendors may also add
     * implementation specific properties. These properties must be prefixed
     * with package names that are unique to the vendor.
     * <p>
     * Setting the property <code>WRITE_XML_DECLARATION</code> to <code>"true"</code>
     * will cause an XML Declaration to be written out at the start of the SOAP
     * message. The default value of "false" suppresses this declaration.
     * <p>
     * The property <code>CHARACTER_SET_ENCODING</code> defaults to the value
     * <code>"utf-8"</code> which causes the SOAP message to be encoded using
     * UTF-8. Setting <code>CHARACTER_SET_ENCODING</code> to <code>"utf-16"</code>
     * causes the SOAP message to be encoded using UTF-16.
     * <p>
     * Some implementations may allow encodings in addition to UTF-8 and
     * UTF-16. Refer to your vendor's documentation for details.
     *
     * @param property
     *           the property with which the specified value is to be
     *           associated.
     * @param value
     *           the value to be associated with the specified property
     * @exception SOAPException
     *               if the property name is not recognized.
     * @since SAAJ 1.2
     */
    public void setProperty(String property, Object value)
        throws SOAPException {
            throw new UnsupportedOperationException("setProperty must be overridden by all subclasses of SOAPMessage");
    }

    /**
     * Retrieves value of the specified property.
     *
     * @param property
     *           the name of the property to retrieve
     * @return the value associated with the named property or <code>null</code>
     *         if no such property exists.
     * @exception SOAPException
     *               if the property name is not recognized.
     * @since SAAJ 1.2
     */
    public Object getProperty(String property) throws SOAPException {
        throw new UnsupportedOperationException("getProperty must be overridden by all subclasses of SOAPMessage");
    }
}

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