/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.activation.DataHandler;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;

/**
 * <P>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>
 * <p/>
 * <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>
 * <p/>
 * <P>A new <CODE>SOAPMessage</CODE> object contains the following by default:</P>
 * <p/>
 * <UL> <LI>A <CODE>SOAPPart</CODE> object</LI>
 * <p/>
 * <LI>A <CODE>SOAPEnvelope</CODE> object</LI>
 * <p/>
 * <LI>A <CODE>SOAPBody</CODE> object</LI>
 * <p/>
 * <LI>A <CODE>SOAPHeader</CODE> object</LI> </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/>
 * <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>
 * <p/>
 * <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>
 * <p/>
 * <P>A <CODE>MessageFactory</CODE> object creates new <CODE> SOAPMessage</CODE> objects. If the
 * <CODE>MessageFactory</CODE> object was initialized with a messaging Profile, it produces
 * <CODE>SOAPMessage</CODE> objects that conform to that Profile. For example, a
 * <CODE>SOAPMessage</CODE> object created by a <CODE>MessageFactory</CODE> object initialized with
 * the ebXML Profile will have the appropriate ebXML headers.</P>
 *
 * @see MessageFactory MessageFactory
 * @see AttachmentPart AttachmentPart
 */
public abstract class SOAPMessage {

    public SOAPMessage() {
    }

    /**
     * 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(String) setContentDescription(java.lang.String)
     */
    public abstract String getContentDescription();

    /**
     * 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() getContentDescription()
     */
    public abstract void setContentDescription(String description);

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

    /**
     * Removes all <CODE>AttachmentPart</CODE> objects that have been added to this
     * <CODE>SOAPMessage</CODE> object.
     * <p/>
     * <P>This method does not touch the SOAP part.</P>
     */
    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);

    /**
     * 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
     * @throws 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
     * @throws IllegalArgumentException
     *          if there was a problem with the specified <CODE> DataHandler</CODE> object
     * @see DataHandler DataHandler
     * @see javax.activation.DataContentHandler DataContentHandler
     */
    public AttachmentPart createAttachmentPart(DataHandler datahandler) {

        AttachmentPart attachmentpart = createAttachmentPart();

        attachmentpart.setDataHandler(datahandler);

        return attachmentpart;
    }

    /**
     * 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.
     *
     * @param content     an <CODE>Object</CODE> containing the content for this
     *                    <CODE>SOAPMessage</CODE> object
     * @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
     * @throws IllegalArgumentException
     *          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 DataHandler DataHandler
     * @see javax.activation.DataContentHandler DataContentHandler
     */
    public AttachmentPart createAttachmentPart(Object content,
                                               String contentType) {

        AttachmentPart attachmentpart = createAttachmentPart();

        attachmentpart.setContent(content, contentType);

        return attachmentpart;
    }

    /**
     * Updates this <CODE>SOAPMessage</CODE> object with all the changes that have been made to it.
     * This method is called automatically when a message is sent or written to by the methods
     * <CODE>ProviderConnection.send</CODE>, <CODE> SOAPConnection.call</CODE>, or <CODE>
     * SOAPMessage.writeTo</CODE>. 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/>
     * <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>
     *
     * @throws SOAPException if there was a problem saving changes to this message.
     */
    public abstract void saveChanges() throws SOAPException;

    /**
     * Indicates whether this <CODE>SOAPMessage</CODE> object has had the method
     * <CODE>saveChanges</CODE> called on it.
     *
     * @return <CODE>true</CODE> if <CODE>saveChanges</CODE> has been called on this message at
     *         least once; <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/>
     * <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>
     *
     * @param out the <CODE>OutputStream</CODE> object to which this <CODE>SOAPMessage</CODE> object
     *            will be written
     * @throws SOAPException if there was a problem in externalizing this SOAP message
     * @throws IOException   if an I/O error occurs
     */
    public abstract void writeTo(OutputStream out)
            throws SOAPException, IOException;

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

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

    /**
     * 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 <code>WRITE_XML_DECLARATION</code> and
     * <code>CHARACTER_SET_ENCODING</code>. 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
     * @throws SOAPException if the property name is not recognized
     */
    public void setProperty(String property, Object value)
            throws SOAPException {
        throw new UnsupportedOperationException(
                "setProperty must be overridden in subclasses of SOAPMessage");
    }

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

    public abstract AttachmentPart getAttachment(SOAPElement soapelement)
            throws SOAPException;

    public abstract void removeAttachments(MimeHeaders mimeheaders);

    /** Specifies the character type encoding for the SOAP Message. */
    public static final String CHARACTER_SET_ENCODING
            = "javax.xml.soap.character-set-encoding";

    /** Specifies whether the SOAP Message should contain an XML declaration. */
    public static final String WRITE_XML_DECLARATION
            = "javax.xml.soap.write-xml-declaration";
}