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/**
*
* 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.
*/
package org.apache.qpid.server.filter;
//
// Based on like named file from r450141 of the Apache ActiveMQ project <http://www.activemq.org/site/home.html>
//
import org.apache.qpid.AMQException;
import org.apache.qpid.server.queue.Filterable;
/**
* An expression which performs an operation on two expression values
*/
public abstract class ArithmeticExpression extends BinaryExpression
{
protected static final int INTEGER = 1;
protected static final int LONG = 2;
protected static final int DOUBLE = 3;
/**
* @param left
* @param right
*/
public ArithmeticExpression(Expression left, Expression right)
{
super(left, right);
}
public static Expression createPlus(Expression left, Expression right)
{
return new ArithmeticExpression(left, right)
{
protected Object evaluate(Object lvalue, Object rvalue)
{
if (lvalue instanceof String)
{
String text = (String) lvalue;
String answer = text + rvalue;
return answer;
}
else if (lvalue instanceof Number)
{
return plus((Number) lvalue, asNumber(rvalue));
}
throw new RuntimeException("Cannot call plus operation on: " + lvalue + " and: " + rvalue);
}
public String getExpressionSymbol()
{
return "+";
}
};
}
public static Expression createMinus(Expression left, Expression right)
{
return new ArithmeticExpression(left, right)
{
protected Object evaluate(Object lvalue, Object rvalue)
{
if (lvalue instanceof Number)
{
return minus((Number) lvalue, asNumber(rvalue));
}
throw new RuntimeException("Cannot call minus operation on: " + lvalue + " and: " + rvalue);
}
public String getExpressionSymbol()
{
return "-";
}
};
}
public static Expression createMultiply(Expression left, Expression right)
{
return new ArithmeticExpression(left, right)
{
protected Object evaluate(Object lvalue, Object rvalue)
{
if (lvalue instanceof Number)
{
return multiply((Number) lvalue, asNumber(rvalue));
}
throw new RuntimeException("Cannot call multiply operation on: " + lvalue + " and: " + rvalue);
}
public String getExpressionSymbol()
{
return "*";
}
};
}
public static Expression createDivide(Expression left, Expression right)
{
return new ArithmeticExpression(left, right)
{
protected Object evaluate(Object lvalue, Object rvalue)
{
if (lvalue instanceof Number)
{
return divide((Number) lvalue, asNumber(rvalue));
}
throw new RuntimeException("Cannot call divide operation on: " + lvalue + " and: " + rvalue);
}
public String getExpressionSymbol()
{
return "/";
}
};
}
public static Expression createMod(Expression left, Expression right)
{
return new ArithmeticExpression(left, right)
{
protected Object evaluate(Object lvalue, Object rvalue)
{
if (lvalue instanceof Number)
{
return mod((Number) lvalue, asNumber(rvalue));
}
throw new RuntimeException("Cannot call mod operation on: " + lvalue + " and: " + rvalue);
}
public String getExpressionSymbol()
{
return "%";
}
};
}
protected Number plus(Number left, Number right)
{
switch (numberType(left, right))
{
case INTEGER:
return Integer.valueOf(left.intValue() + right.intValue());
case LONG:
return Long.valueOf(left.longValue() + right.longValue());
default:
return Double.valueOf(left.doubleValue() + right.doubleValue());
}
}
protected Number minus(Number left, Number right)
{
switch (numberType(left, right))
{
case INTEGER:
return Integer.valueOf(left.intValue() - right.intValue());
case LONG:
return Long.valueOf(left.longValue() - right.longValue());
default:
return Double.valueOf(left.doubleValue() - right.doubleValue());
}
}
protected Number multiply(Number left, Number right)
{
switch (numberType(left, right))
{
case INTEGER:
return Integer.valueOf(left.intValue() * right.intValue());
case LONG:
return Long.valueOf(left.longValue() * right.longValue());
default:
return Double.valueOf(left.doubleValue() * right.doubleValue());
}
}
protected Number divide(Number left, Number right)
{
return Double.valueOf(left.doubleValue() / right.doubleValue());
}
protected Number mod(Number left, Number right)
{
return Double.valueOf(left.doubleValue() % right.doubleValue());
}
private int numberType(Number left, Number right)
{
if (isDouble(left) || isDouble(right))
{
return DOUBLE;
}
else if ((left instanceof Long) || (right instanceof Long))
{
return LONG;
}
else
{
return INTEGER;
}
}
private boolean isDouble(Number n)
{
return (n instanceof Float) || (n instanceof Double);
}
protected Number asNumber(Object value)
{
if (value instanceof Number)
{
return (Number) value;
}
else
{
throw new RuntimeException("Cannot convert value: " + value + " into a number");
}
}
public Object evaluate(Filterable message)
{
Object lvalue = left.evaluate(message);
if (lvalue == null)
{
return null;
}
Object rvalue = right.evaluate(message);
if (rvalue == null)
{
return null;
}
return evaluate(lvalue, rvalue);
}
/**
* @param lvalue
* @param rvalue
* @return
*/
protected abstract Object evaluate(Object lvalue, Object rvalue);
}
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