javax.xml.soap

## Class MessageFactory

- java.lang.Object
- - javax.xml.soap.MessageFactory

-     public abstract class MessageFactory
      extends Object

  A factory for creating `SOAPMessage` objects.

  A SAAJ client can create a `MessageFactory` object using the method `newInstance`, as shown in the following lines of code.

             MessageFactory mf = MessageFactory.newInstance();
             MessageFactory mf12 = MessageFactory.newInstance(SOAPConstants.SOAP_1_2_PROTOCOL);

  All `MessageFactory` objects, regardless of how they are created, will produce `SOAPMessage` objects that have the following elements by default:

  - A `SOAPPart` object
  - A `SOAPEnvelope` object
  - A `SOAPBody` object
  - A `SOAPHeader` object
  In some cases, specialized MessageFactory objects may be obtained that produce messages prepopulated with additional entries in the `SOAPHeader` object and the `SOAPBody` object. The content of a new `SOAPMessage` object depends on which of the two `MessageFactory` methods is used to create it.
  - `createMessage()`
    This is the method clients would normally use to create a request message.
  - `createMessage(MimeHeaders, java.io.InputStream)` -- message has content from the `InputStream` object and headers from the `MimeHeaders` object
    This method can be used internally by a service implementation to create a message that is a response to a request.

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `MessageFactory()` |

  - ### Method Summary

    All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `abstract SOAPMessage` | `createMessage()` | Creates a new `SOAPMessage` object with the default `SOAPPart`, `SOAPEnvelope`, `SOAPBody`, and `SOAPHeader` objects.
    `abstract SOAPMessage` | `createMessage(MimeHeaders headers, InputStream in)` | Internalizes the contents of the given `InputStream` object into a new `SOAPMessage` object and returns the `SOAPMessage` object.
    `static MessageFactory` | `newInstance()` | Creates a new `MessageFactory` object that is an instance of the default implementation (SOAP 1.1), This method uses the following ordered lookup procedure to determine the MessageFactory implementation class to load: Use the javax.xml.soap.MessageFactory system property.
    `static MessageFactory` | `newInstance(String protocol)` | Creates a new `MessageFactory` object that is an instance of the specified implementation.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### MessageFactory

          public MessageFactory()

  - ### Method Detail

    - #### newInstance

          public static MessageFactory newInstance()
                                            throws SOAPException

      Creates a new `MessageFactory` object that is an instance of the default implementation (SOAP 1.1), This method uses the following ordered lookup procedure to determine the MessageFactory implementation class to load:
      - Use the javax.xml.soap.MessageFactory system property.
      - Use the properties file "lib/jaxm.properties" in the JRE directory. This configuration file is in standard java.util.Properties format and contains the fully qualified name of the implementation class with the key being the system property defined above.
      - Use the Services API (as detailed in the JAR specification), if available, to determine the classname. The Services API will look for a classname in the file META-INF/services/javax.xml.soap.MessageFactory in jars available to the runtime.
      - Use the SAAJMetaFactory instance to locate the MessageFactory implementation class.
      Returns:
        a new instance of a `MessageFactory`
      Throws:
        `SOAPException` - if there was an error in creating the default implementation of the `MessageFactory`.
      See Also:
        `SAAJMetaFactory`

    - #### newInstance

          public static MessageFactory newInstance(String protocol)
                                            throws SOAPException

      Creates a new `MessageFactory` object that is an instance of the specified implementation. May be a dynamic message factory, a SOAP 1.1 message factory, or a SOAP 1.2 message factory. A dynamic message factory creates messages based on the MIME headers specified as arguments to the `createMessage` method. This method uses the SAAJMetaFactory to locate the implementation class and create the MessageFactory instance.
      Parameters:
        `protocol` - a string constant representing the class of the specified message factory implementation. May be either `DYNAMIC_SOAP_PROTOCOL`, `DEFAULT_SOAP_PROTOCOL` (which is the same as) `SOAP_1_1_PROTOCOL`, or `SOAP_1_2_PROTOCOL`.
      Returns:
        a new instance of a `MessageFactory`
      Throws:
        `SOAPException` - if there was an error in creating the specified implementation of `MessageFactory`.
      Since:
        SAAJ 1.3
      See Also:
        `SAAJMetaFactory`

    - #### createMessage

          public abstract SOAPMessage createMessage()
                                             throws SOAPException

      Creates a new `SOAPMessage` object with the default `SOAPPart`, `SOAPEnvelope`, `SOAPBody`, and `SOAPHeader` objects. Profile-specific message factories can choose to prepopulate the `SOAPMessage` object with profile-specific headers.

      Content can be added to this message's `SOAPPart` object, and the message can be sent "as is" when a message containing only a SOAP part is sufficient. Otherwise, the `SOAPMessage` object needs to create one or more `AttachmentPart` objects and add them to itself. Any content that is not in XML format must be in an `AttachmentPart` object.

      Returns:
        a new `SOAPMessage` object
      Throws:
        `SOAPException` - if a SOAP error occurs
        `UnsupportedOperationException` - if the protocol of this `MessageFactory` instance is `DYNAMIC_SOAP_PROTOCOL`

    - #### createMessage

          public abstract SOAPMessage createMessage(MimeHeaders headers,
                                                    InputStream in)
                                             throws IOException,
                                                    SOAPException

      Internalizes the contents of the given `InputStream` object into a new `SOAPMessage` object and returns the `SOAPMessage` object.
      Parameters:
        `in` - the `InputStream` object that contains the data for a message
        `headers` - the transport-specific headers passed to the message in a transport-independent fashion for creation of the message
      Returns:
        a new `SOAPMessage` object containing the data from the given `InputStream` object
      Throws:
        `IOException` - if there is a problem in reading data from the input stream
        `SOAPException` - may be thrown if the message is invalid
        `IllegalArgumentException` - if the `MessageFactory` requires one or more MIME headers to be present in the `headers` parameter and they are missing. `MessageFactory` implementations for `SOAP_1_1_PROTOCOL` or `SOAP_1_2_PROTOCOL` must not throw `IllegalArgumentException` for this reason.

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