/*****************************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* distributed with this work for additional information *
* regarding copyright ownership. The ASF licenses this file *
* to you under the Apache License, Version 2.0 (the *
* "License"); you may not use this file except in compliance *
* with the License. You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, *
* software distributed under the License is distributed on an *
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
* KIND, either express or implied. See the License for the *
* specific language governing permissions and limitations *
* under the License. *
* *
* *
* This file is part of the BeanShell Java Scripting distribution. *
* Documentation and updates may be found at http://www.beanshell.org/ *
* Patrick Niemeyer (pat@pat.net) *
* Author of Learning Java, O'Reilly & Associates *
* *
*****************************************************************************/
package bsh;
class
BSHIfStatement extends
SimpleNode
{
BSHIfStatement(int
id) { super(
id); }
public
Object eval(
CallStack callstack,
Interpreter interpreter)
throws
EvalError
{
Object ret = null;
if(
evaluateCondition(
(
SimpleNode)
jjtGetChild(0),
callstack,
interpreter ) )
ret = ((
SimpleNode)
jjtGetChild(1)).
eval(
callstack,
interpreter);
else
if(
jjtGetNumChildren() > 2)
ret = ((
SimpleNode)
jjtGetChild(2)).
eval(
callstack,
interpreter);
if(
ret instanceof
ReturnControl)
return
ret;
else
return
Primitive.
VOID;
}
public static boolean
evaluateCondition(
SimpleNode condExp,
CallStack callstack,
Interpreter interpreter)
throws
EvalError
{
Object obj =
condExp.
eval(
callstack,
interpreter);
if(
obj instanceof
Primitive) {
if (
obj ==
Primitive.
VOID )
throw new
EvalError("Condition evaluates to void type",
condExp,
callstack );
obj = ((
Primitive)
obj).
getValue();
}
if(
obj instanceof
Boolean)
return ((
Boolean)
obj).
booleanValue();
else
throw new
EvalError(
"Condition must evaluate to a Boolean or boolean.",
condExp,
callstack );
}
}