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/*
* Copyright (c) 2001-2004 Ant-Contrib project. All rights reserved.
*
* Licensed 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 net.sf.antcontrib.math;
import org.apache.tools.ant.BuildException;
/**
* A numeric value that implements Evaluateable.
*
* @author inger
*/
public class Numeric
implements Evaluateable
{
private String datatype;
private String value;
/**
* Set the value for this number. This string must parse to the set
* datatype, for example, setting value to "7.992" and datatype to INT
* will cause a number format exception to be thrown. Supports two special
* numbers, "E" and "PI".
*
* @param value the value for this number
*/
public void setValue(String value)
{
if (value.equals("E"))
value = String.valueOf(java.lang.Math.E);
else if (value.equals("PI"))
value = String.valueOf(java.lang.Math.PI);
this.value = value;
}
/**
* @return the value for this number as a Number. Cast as appropriate to
* Integer, Long, Float, or Double.
*/
public Number evaluate()
{
if (datatype == null)
datatype = "double";
if (datatype.equals("int"))
return new Integer(value);
if (datatype.equals("long"))
return new Long(value);
if (datatype.equals("float"))
return new Float(value);
if (datatype.equals("double"))
return new Double(value);
throw new BuildException("Invalid datatype.");
}
/**
* Sets the datatype of this number. Allowed values are
* "int", "long", "float", or "double".
*/
public void setDatatype(String p)
{
datatype = p;
}
/**
* @return the datatype as one of the defined types.
*/
public String getDatatype()
{
if (datatype == null)
datatype = "double";
return datatype;
}
public String toString()
{
return "Numeric[value=" + value
+ ";datatype=" + datatype
+ "]";
}
}
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