package prefuse.data.expression;
import prefuse.data.Schema;
import prefuse.data.Tuple;
/**
* Literal expression of a boolean value.
* @author <a href="http://jheer.org">jeffrey heer</a>
*/
public class BooleanLiteral extends Literal implements Predicate
{
/** The true boolean literal. */
public static final BooleanLiteral TRUE = new BooleanLiteral(true);
/** The false boolean literal. */
public static final BooleanLiteral FALSE = new BooleanLiteral(false);
private final boolean m_value;
/**
* Create a new BooleanLiteral.
* @param b the boolean value
*/
public BooleanLiteral(boolean b) {
m_value = b;
}
/**
* @see prefuse.data.expression.Expression#getBoolean(prefuse.data.Tuple)
*/
public boolean getBoolean(Tuple tuple) {
return m_value;
}
/**
* @see prefuse.data.expression.Expression#getType(prefuse.data.Schema)
*/
public Class getType(Schema s) {
return boolean.class;
}
/**
* @see prefuse.data.expression.Expression#get(prefuse.data.Tuple)
*/
public Object get(Tuple t) {
return ( getBoolean(t) ? Boolean.TRUE : Boolean.FALSE );
}
/**
* @see java.lang.Object#toString()
*/
public String toString() {
return String.valueOf(m_value).toUpperCase();
}
} // end of class BooleanLiteral