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package com.sun.el.parser;
import java.util.List;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.el.LambdaExpression;
import com.sun.el.lang.EvaluationContext;
import com.sun.el.ValueExpressionImpl;
import com.sun.el.util.MessageFactory;
/**
* @author Kin-man Chung
*/
public
class AstLambdaExpression extends SimpleNode {
public AstLambdaExpression(int id) {
super(id);
}
public Object getValue(EvaluationContext ctx) throws ELException {
// Create a lambda expression
ValueExpression expr =
new ValueExpressionImpl("#{Lambda Expression}",
this.children[1],
ctx.getFunctionMapper(),
ctx.getVariableMapper(),
null);
List<String>parameters =
((AstLambdaParameters) this.children[0]).getParameters();
LambdaExpression lambda = new LambdaExpression(parameters, expr);
if (this.children.length <= 2) {
return lambda;
}
// There are arguments following the lambda exprn, invoke it now.
Object ret = null;
for (int i = 2; i < this.children.length; i++) {
if (ret != null) {
if (!(ret instanceof LambdaExpression)) {
throw new ELException(MessageFactory.get(
"error.lambda.call"));
}
lambda = (LambdaExpression) ret;
}
AstMethodArguments args = (AstMethodArguments) this.children[i];
ret = lambda.invoke(ctx, args.getParameters(ctx));
}
return ret;
}
}