org.apache.taglibs.standard.tag.el.fmt.BundleTag Maven / Gradle / Ivy
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package org.apache.taglibs.standard.tag.el.fmt;
import javax.servlet.jsp.JspException;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.apache.taglibs.standard.tag.common.fmt.BundleSupport;
/**
* A handler for <bundle> that accepts attributes as Strings
* and evaluates them as expressions at runtime.
*
* @author Shawn Bayern
* @author Jan Luehe
*/
public class BundleTag extends BundleSupport {
//*********************************************************************
// 'Private' state (implementation details)
private String basename_; // stores EL-based property
private String prefix_; // stores EL-based property
//*********************************************************************
// Constructor
/**
* Constructs a new BundleTag. As with TagSupport, subclasses
* should not provide other constructors and are expected to call
* the superclass constructor
*/
public BundleTag() {
super();
init();
}
//*********************************************************************
// Tag logic
// evaluates expression and chains to parent
public int doStartTag() throws JspException {
// evaluate any expressions we were passed, once per invocation
evaluateExpressions();
// chain to the parent implementation
return super.doStartTag();
}
// Releases any resources we may have (or inherit)
public void release() {
super.release();
init();
}
//*********************************************************************
// Accessor methods
// for EL-based attribute
public void setBasename(String basename_) {
this.basename_ = basename_;
}
// for EL-based attribute
public void setPrefix(String prefix_) {
this.prefix_ = prefix_;
}
//*********************************************************************
// Private (utility) methods
// (re)initializes state (during release() or construction)
private void init() {
// null implies "no expression"
basename_ = prefix_ = null;
}
// Evaluates expressions as necessary
private void evaluateExpressions() throws JspException {
// 'basename' attribute (mandatory)
basename = (String) ExpressionEvaluatorManager.evaluate(
"basename", basename_, String.class, this, pageContext);
// 'prefix' attribute (optional)
if (prefix_ != null) {
prefix = (String) ExpressionEvaluatorManager.evaluate(
"prefix", prefix_, String.class, this, pageContext);
}
}
}