tobrien 2004/06/12 18:40:18
Added: jexl/src/java/org/apache/commons/jexl/parser package.html
jexl/src/java/org/apache/commons/jexl package.html
jexl/src/java/org/apache/commons/jexl/context package.html
Log:
Added package.html to the jexl, jexl.context, and jexl.parser packages
Revision Changes Path
1.1
jakarta-commons/jexl/src/java/org/apache/commons/jexl/parser/package.html
Index: package.html
===================================================================
<html>
<head>
<title>Package Documentation for org.apache.commons.jexl.parser Package</title>
</head>
<body bgcolor="white">
Contains the Parser for JEXL script.
<br><br>
<p>
<ul>
<li><a href="#intro">Introduction</a></li>
</ul>
</p>
<h2><a name="intro">Introduction</a></h2>
<p>
This package contains the Parser for JEXL script.
</p>
</body>
</html>
1.1
jakarta-commons/jexl/src/java/org/apache/commons/jexl/package.html
Index: package.html
===================================================================
<html>
<head>
<title>Package Documentation for org.apache.commons.jexl Package</title>
</head>
<body bgcolor="white">
Provides a framework for evaluating JEXL expressions.
<br><br>
<p>
<ul>
<li><a href="#intro">Introduction</a></li>
<li><a href="#example">Brief Example</a></li>
</ul>
</p>
<h2><a name="intro">Introduction</a></h2>
<p>
Java Expression Language (JEXL) is an expression language engine which can be
embedded in applications and frameworks. JEXL is inspired by Jakarta Velocity
and the Expression Language defined in the JavaServer Pages Standard Tag Library
version 1.1 (JSTL) and JavaServer Pages version 2.0 (JSP).
</p>
<p>
JEXL attempts to bring some of the lessons learned by the Velocity
community about expression languages in templating to a wider audience.
<a href="http://jakarta.apache.org/commons/jelly";>Commons Jelly needed</a>
Velocity-ish method access, it just had to have it.
</p>
<p>
It must be noted that JEXL is not a compatibile implementation of EL as defined
in JSTL 1.1 (JSR-052) or JSP 2.0 (JSR-152). For a compatible implementation of
these specifications, see the <a href="http://jakarta.apache.org/commons/el";>
Commons EL</a> project.
</p>
<h2><a name="example">A Brief Example</a></h2>
<p>
When evaluating expressions, JEXL merges an
<a
href="http://jakarta.apache.org/commons/jexl/apidocs/org/apache/commons/jexl/Expression.html";>Expression</a>
with a
<a
href="http://jakarta.apache.org/commons/jexl/apidocs/org/apache/commons/jexl/JexlContext.html";>JexlContext</a>.
An Expression is created using
<a
href="http://jakarta.apache.org/commons/jexl/apidocs/org/apache/commons/jexl/ExpressionFactory.html#createExpression(java.lang.String)">ExpressionFactory.createExpression()</a>,
passing a String containing valid JEXL syntax. A JexlContext is created using
<a
href="http://jakarta.apache.org/commons/jexl/apidocs/org/apache/commons/jexl/JexlHelper.html#createContext()">JexlHelper.createContext()</a>,
and variables are put into a map exposed through the
<a
href="http://jakarta.apache.org/commons/jexl/apidocs/org/apache/commons/jexl/JexlContext.html#getVars()">getVars()</a>
method on JexlContext. The following example, takes a variable named foo, and
invokes the bar() method on the property innerFoo:
</p>
<pre>
// Create an expression object
String jexlExp = "foo.innerFoo.bar()";
Expression e = ExpressionFactory.createExpression( jexlExp );
// Create a context and add data
JexlContext jc = JexlHelper.createContext();
jc.getVars().put("foo", new Foo() );
// Now evaluate the expression, getting the result
Object o = e.evaluate(jc);</pre>
</pre>
</body>
</html>
1.1
jakarta-commons/jexl/src/java/org/apache/commons/jexl/context/package.html
Index: package.html
===================================================================
<html>
<head>
<title>Package Documentation for org.apache.commons.jexl.context Package</title>
</head>
<body bgcolor="white">
Simple JexlContext implementations.
<br><br>
<p>
<ul>
<li><a href="#intro">Introduction</a></li>
</ul>
</p>
<h2><a name="intro">Introduction</a></h2>
<p>
This package only contains one JexlContext implementation, the
HashMapContext. A HashMapContext is simply an extension of
HashMap which implements the JexlContext interface.
</p>
</body>
</html>
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