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package org.apache.jasper.runtime;
import java.util.HashMap;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.VariableMapper;
import javax.el.ValueExpression;
/**
* This is the implementation of VariableMapper.
* The compiler creates an empty variable mapper when an ELContext is created.
* The variable mapper will be updated by tag handlers, if necessary.
*
* @author Kin-man Chung
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: hmalphett $
**/
public class VariableMapperImpl extends VariableMapper
{
//-------------------------------------
/**
* Constructor
**/
public VariableMapperImpl () {
map = new HashMap();
}
//-------------------------------------
/**
* Resolves the specified variable within the given context.
* Returns null if the variable is not found.
**/
public ValueExpression resolveVariable (String variable) {
return map.get(variable);
}
public ValueExpression setVariable(String variable,
ValueExpression expression) {
ValueExpression prev = null;
if (expression == null) {
map.remove(variable);
} else {
prev = map.get(variable);
map.put(variable, expression);
}
return prev;
}
private HashMap map;
}