/*
* This file or a portion of this file is licensed under the terms of
* the Globus Toolkit Public License, found in file GTPL, or at
* http://www.globus.org/toolkit/download/license.html. This notice must
* appear in redistributions of this file, with or without modification.
*
* Redistributions of this Software, with or without modification, must
* reproduce the GTPL in: (1) the Software, or (2) the Documentation or
* some other similar material which is provided with the Software (if
* any).
*
* Copyright 1999-2004 University of Chicago and The University of
* Southern California. All rights reserved.
*/
package org.griphyn.vdl.annotation;
import java.sql.Types;
/**
* This simple class defines the double values for the values at the
* heart of Yong's annotations.
*
* @author Jens-S. Vöckler
* @author Yong Zhao
* @version $Revision$
*/
public class TupleFloat extends Tuple
{
/**
* Defines the key for which we store the annotation.
*/
private double m_value = 0.0;
/**
* Constructs an instance of a double tuple.
*
* @param key is the key to store annotations for.
* @param value is the double value of the annotation.
*/
public TupleFloat( String key, double value )
{
super(key);
m_value = value;
}
/**
* Obtains the current value of the value part.
*
* @return the current value as double.
* @see #setDouble( double )
*/
public double getDouble()
{
return m_value;
}
/**
* Overwrites the current value of the value part.
*
* @param value is the new value to use from now on.
* @see #getDouble()
*/
public void setDouble( double value )
{
m_value = value;
}
/**
* Return generically the value wrapped into a Java class.
*
* @return the value wrapped as Java object.
* @see #setValue( Object )
* @see java.lang.Double
*/
public Object getValue()
{
return new Double( m_value );
}
/**
* Generic interface to set a value in an instance. Note that this
* action may fail, if the instance is of an incompatible type.
*
* @param value is the data object to set.
* @see #getValue()
* @exception ClassCastException if the actual argument type of the value
* is incompatible with the value maintained by the instance.
* @exception NumberFormatException if the String does not contain
* something that is parsable into a double value. */
public void setValue( Object value )
throws ClassCastException
{
if ( value instanceof java.lang.Number )
m_value = ((Number) value).doubleValue();
else if ( value instanceof java.lang.String )
m_value = Double.parseDouble((String) value);
else
throw new ClassCastException( "type cast failed: not a number" );
}
/**
* Returns the type of the value as SQL Type.
*
* @return a constant from the set of SQL types.
* @see java.sql.Types
*/
public int getType()
{
return java.sql.Types.DOUBLE;
}
/**
* Returns the string representation of the type.
*/
public String getTypeString()
{
return "float";
}
}