NumberLiteral.java

package com.dragome.compiler.ast;

import org.apache.bcel.generic.Type;

import com.dragome.compiler.generators.AbstractVisitor;

public class NumberLiteral extends Expression
{

	public static Number ZERO= new Integer(0);

	public static Number ONE= new Integer(1);

	public static Number MINUS_ONE= new Integer(-1);

	private Number value;

	public static boolean isZero(Expression expr)
	{
		if (expr == null || !(expr instanceof NumberLiteral))
			return false;
		return ((NumberLiteral) expr).getValue().equals(ZERO);
	}

	public static boolean isOne(Expression expr)
	{
		if (expr == null || !(expr instanceof NumberLiteral))
			return false;
		return ((NumberLiteral) expr).getValue().equals(ONE);
	}

	public static boolean isMinusOne(Expression expr)
	{
		if (expr == null || !(expr instanceof NumberLiteral))
			return false;
		return ((NumberLiteral) expr).getValue().equals(MINUS_ONE);
	}

	private NumberLiteral(Number theValue)
	{
		value= theValue;
		if (theValue instanceof Integer)
		{
			type= Type.INT;
		}
		else if (theValue instanceof Byte)
		{
			type= Type.BYTE;
		}
		else if (theValue instanceof Float)
		{
			type= Type.FLOAT;
		}
		else if (theValue instanceof Double)
		{
			type= Type.DOUBLE;
		}
		else if (theValue instanceof Long)
		{
			type= Type.LONG;
		}
		else if (theValue instanceof Short)
		{
			type= Type.SHORT;
		}
		else

			throw new RuntimeException("Type not supported: " + theValue.getClass());
	}

	public static NumberLiteral create(int i)
	{
		Number value;
		if (i == 0)
			value= ZERO;
		else if (i == 1)
			value= ONE;
		else
			value= new Integer(i);
		return new NumberLiteral(value);
	}

	public static NumberLiteral create(Number value)
	{
		if (value instanceof Integer)
		{
			Integer i= (Integer) value;
			if (i.intValue() == 0)
				value= ZERO;
			else if (i.intValue() == 1)
				value= ONE;
		}
		return new NumberLiteral(value);
	}

	public void visit(AbstractVisitor visitor)
	{
		visitor.visit(this);
	}

	public Number getValue()
	{
		return value;
	}

	public void setValue(Number theValue)
	{
		value= theValue;
	}

	public String toString()
	{
		return super.toString() + " value " + value;
	}

}