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Java 2 Platform EE v1.3: Interface MapMessage
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javax.jms</FONT>
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Interface MapMessage</H2>
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<DT><B>All Superinterfaces:</B> <DD><A HREF="../../javax/jms/Message.html">Message</A></DD>
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<DT>public interface <B>MapMessage</B><DT>extends <A HREF="../../javax/jms/Message.html">Message</A></DL>
<P>
A <CODE>MapMessage</CODE> object is used to send a set of name-value pairs.
The names are <CODE>String</CODE> objects, and the values are primitive
data types in the Java programming language. The entries can be accessed
sequentially or randomly by name. The order of the entries is undefined.
<CODE>MapMessage</CODE> inherits from the <CODE>Message</CODE> interface
and adds a message body that contains a Map.
<P>The primitive types can be read or written explicitly using methods
for each type. They may also be read or written generically as objects.
For instance, a call to <CODE>MapMessage.setInt("foo", 6)</CODE> is
equivalent to <CODE>MapMessage.setObject("foo", new Integer(6))</CODE>.
Both forms are provided, because the explicit form is convenient for
static programming, and the object form is needed when types are not known
at compile time.
<P>When a client receives a <CODE>MapMessage</CODE>, it is in read-only
mode. If a client attempts to write to the message at this point, a
<CODE>MessageNotWriteableException</CODE> is thrown. If
<CODE>clearBody</CODE> is called, the message can now be both read from and
written to.
<P><CODE>MapMessage</CODE> objects support the following conversion table.
The marked cases must be supported. The unmarked cases must throw a
<CODE>JMSException</CODE>. The <CODE>String</CODE>-to-primitive conversions
may throw a runtime exception if the primitive's <CODE>valueOf()</CODE>
method does not accept it as a valid <CODE>String</CODE> representation of
the primitive.
<P>A value written as the row type can be read as the column type.
<PRE>
| | boolean byte short char int long float double String byte[]
|----------------------------------------------------------------------
|boolean | X X
|byte | X X X X X
|short | X X X X
|char | X X
|int | X X X
|long | X X
|float | X X X
|double | X X
|String | X X X X X X X X
|byte[] | X
|----------------------------------------------------------------------
</PRE>
<P>Attempting to read a null value as a primitive type must be treated
as calling the primitive's corresponding <code>valueOf(String)</code>
conversion method with a null value. Since <code>char</code> does not
support a <code>String</code> conversion, attempting to read a null value
as a <code>char</code> must throw a <code>NullPointerException</code>.
<P>
<DL>
<DT><B>See Also: </B><DD><A HREF="../../javax/jms/Session.html#createMapMessage()"><CODE>Session.createMapMessage()</CODE></A>,
<A HREF="../../javax/jms/BytesMessage.html"><CODE>BytesMessage</CODE></A>,
<A HREF="../../javax/jms/Message.html"><CODE>Message</CODE></A>,
<A HREF="../../javax/jms/ObjectMessage.html"><CODE>ObjectMessage</CODE></A>,
<A HREF="../../javax/jms/StreamMessage.html"><CODE>StreamMessage</CODE></A>,
<A HREF="../../javax/jms/TextMessage.html"><CODE>TextMessage</CODE></A></DL>
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<TD><B>Fields inherited from interface javax.jms.<A HREF="../../javax/jms/Message.html">Message</A></B></TD>
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<TD><CODE><A HREF="../../javax/jms/Message.html#DEFAULT_DELIVERY_MODE">DEFAULT_DELIVERY_MODE</A>, <A HREF="../../javax/jms/Message.html#DEFAULT_PRIORITY">DEFAULT_PRIORITY</A>, <A HREF="../../javax/jms/Message.html#DEFAULT_TIME_TO_LIVE">DEFAULT_TIME_TO_LIVE</A></CODE></TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getBoolean(java.lang.String)">getBoolean</A></B>(java.lang.String name)</CODE>
<BR>
Returns the <CODE>boolean</CODE> value with the specified name.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> byte</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getByte(java.lang.String)">getByte</A></B>(java.lang.String name)</CODE>
<BR>
Returns the <CODE>byte</CODE> value with the specified name.</TD>
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<CODE> byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getBytes(java.lang.String)">getBytes</A></B>(java.lang.String name)</CODE>
<BR>
Returns the byte array value with the specified name.</TD>
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<CODE> char</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getChar(java.lang.String)">getChar</A></B>(java.lang.String name)</CODE>
<BR>
Returns the Unicode character value with the specified name.</TD>
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<CODE> double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getDouble(java.lang.String)">getDouble</A></B>(java.lang.String name)</CODE>
<BR>
Returns the <CODE>double</CODE> value with the specified name.</TD>
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<CODE> float</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getFloat(java.lang.String)">getFloat</A></B>(java.lang.String name)</CODE>
<BR>
Returns the <CODE>float</CODE> value with the specified name.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getInt(java.lang.String)">getInt</A></B>(java.lang.String name)</CODE>
<BR>
Returns the <CODE>int</CODE> value with the specified name.</TD>
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<CODE> long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getLong(java.lang.String)">getLong</A></B>(java.lang.String name)</CODE>
<BR>
Returns the <CODE>long</CODE> value with the specified name.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Enumeration</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MapMessage.html#getMapNames()">getMapNames</A></B>()</CODE>
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