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ParamTag.javaAPI DocGlassfish v2 API4563Sat May 05 19:17:56 BST 2007org.apache.taglibs.standard.tag.el.fmt

ParamTag

public class ParamTag extends org.apache.taglibs.standard.tag.common.fmt.ParamSupport

A handler for <param> that accepts message arguments as Strings and evaluates them as expressions at runtime.

author
Jan Luehe

Fields Summary
private String
value_
Constructors Summary
public ParamTag()
Constructs a new ParamTag. As with TagSupport, subclasses should not provide other constructors and are expected to call the superclass constructor

        super();
        init();
Methods Summary
public intdoStartTag()


        // evaluate any expressions we were passed, once per invocation
        evaluateExpressions();

	// chain to the parent implementation
	return super.doStartTag();
private voidevaluateExpressions()

        /* 
         * Note: we don't check for type mismatches here; we assume
         * the expression evaluator will return the expected type
         * (by virtue of knowledge we give it about what that type is).
         * A ClassCastException here is truly unexpected, so we let it
         * propagate up.
         */

	if (value_ != null) {
	    value = ExpressionEvaluatorManager.evaluate(
	        "value", value_, Object.class, this, pageContext);
	}
private voidinit()

        // null implies "no expression"
	value_ = null;
public voidrelease()

        super.release();
        init();
public voidsetValue(java.lang.String value_)

        this.value_ = value_;
	this.valueSpecified = true;