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Spring Expression Language docs

This commit is contained in:
Mark Pollack 2009-04-07 04:45:05 +00:00
parent 1f00e639e0
commit 5f5bee1022
1 changed files with 13 additions and 8 deletions
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21
spring-framework-reference/src/expressions.xml
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@ -95,6 +95,10 @@
<para>User defined functions</para>
</listitem>
<listitem>
<para>List projections</para>
</listitem>
<listitem>
<para>Templated expressions</para>
</listitem>
@ -564,7 +568,7 @@ boolean falseValue = parser.parseExpression(expression).getValue(societyContext,
supported are modulus (%) and exponential power (^). Standard operator
precedence is enforced. These operators are demonstrated below </para>
<para><programlisting>// Addition
<para><programlisting language="java">// Addition
int two = parser.parseExpression("1 + 1").getValue(Integer.class); // 2
String testString = parser.parseExpression("'test' + ' ' + 'string'").getValue(String.class); // 'test string'
@ -605,7 +609,7 @@ int minusTwentyOne = parser.parseExpression("1+2-3*8").getValue(Integer.class);
This would typically be done within a call to SetValue but can also be
done inside a call to GetValue </para>
<programlisting>Inventor inventor = new Inventor();
<programlisting language="java">Inventor inventor = new Inventor();
StandardEvaluationContext inventorContext = new StandardEvaluationContext();
inventorContext.setRootObject(inventor);
@ -627,7 +631,7 @@ String aleks = parser.parseExpression("Name = 'Alexandar Seovic'").getValue(inve
java.lang.Class (the 'type'). Static methods are invoked using this
operator as well</para>
<programlisting>Class dateClass = parser.parseExpression("T(java.util.Date)").getValue(Class.class);
<programlisting language="java">Class dateClass = parser.parseExpression("T(java.util.Date)").getValue(Class.class);
boolean isEqual = parser.parseExpression("T(java.math.RoundingMode).CEILING &lt; T(java.math.RoundingMode).FLOOR").getValue(Boolean.class);
@ -641,7 +645,7 @@ boolean isEqual = parser.parseExpression("T(java.math.RoundingMode).CEILING &lt;
qualified classname should be used for all but the primitive type and
String (where int, float, etc, can be used).</para>
<programlisting>Inventor einstein =
<programlisting language="java">Inventor einstein =
parser.parseExpression("new org.spring.samples.spel.inventor.Inventor('Albert Einstein', 'German')").getValue(Inventor.class);
//create new inventor instance within add method of List
@ -656,7 +660,7 @@ parser.parseExpression("Members.add(new org.spring.samples.spel.inventor.Invento
#variableName. Variables are set using the method setVariable on the
StandardEvaluationContext. </para>
<programlisting>Inventor tesla = new Inventor("Nikola Tesla", "Serbian");
<programlisting language="java">Inventor tesla = new Inventor("Nikola Tesla", "Serbian");
StandardEvaluationContext context = new StandardEvaluationContext();
context.setVariable("newName", "Mike Tesla");
context.setRootObject(tesla);
@ -689,13 +693,14 @@ System.out.println(tesla.getName()) // "Mike Tesla"</programlisting>
<para>In this case, the boolean false results in returning the string
value 'falseExp'. A less artificial example is shown below.</para>
<programlisting>parser.parseExpression("Name").setValue(societyContext, "IEEE");
<programlisting language="java">parser.parseExpression("Name").setValue(societyContext, "IEEE");
societyContext.setVariable("queryName", "Nikola Tesla");
expression = "isMember(#queryName)? #queryName + ' is a member of the ' " +
"+ Name + ' Society' : #queryName + ' is not a member of the ' + Name + ' Society'";
String queryResultString = parser.parseExpression(expression).getValue(societyContext, String.class);</programlisting>
String queryResultString = parser.parseExpression(expression).getValue(societyContext, String.class);
// queryResultString = "Nikola Tesla is a member of the IEEE Society"</programlisting>
</section>
<section>
@ -711,7 +716,7 @@ String queryResultString = parser.parseExpression(expression).getValue(societyCo
original element list. For example, selection would allow us to easily
get a list of Serbian inventors:</para>
<programlisting>List&lt;Inventor&gt; list = (List&lt;Inventor&gt;) parser.parseExpression("Members.?{Nationality == 'Serbian'}").getValue(societyContext);</programlisting>
<programlisting language="java">List&lt;Inventor&gt; list = (List&lt;Inventor&gt;) parser.parseExpression("Members.?{Nationality == 'Serbian'}").getValue(societyContext);</programlisting>
</section>
<section>