VARToken.java

/*
 * JMEP - Java Mathematical Expression Parser.
 * Copyright (C) 1999  Jo Desmet
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * You can contact the Original submitter of this library by
 * email at: Jo_Desmet@yahoo.com.
 * 
 */

package com.iabcinc.jmep.tokens;

import com.iabcinc.jmep.hooks.Variable;
import com.iabcinc.jmep.XUndefinedVariable;

public class VARToken extends Token {
	private Variable variable;
	//  private Object value;
	private String name;

	public VARToken(String name, int position) {
		super(Token.VAR, position);
		this.variable = null;
		//    this.value = null;
		this.name = name;
	}

	public VARToken(String sName, Variable variable, int position) {
		super(Token.VAR, position);
		this.variable = variable;
		//    value = null;
		name = sName;
	}

	//  public VARToken(String sName,int dValue,int position) {
	//    super(Token.VAR,position);
	//    variable = null;
	//    value = new Integer(dValue);
	//    name = sName;
	//  }
	//
	//  public VARToken(String sName,boolean bValue,int position) {
	//    super(Token.VAR,position);
	//    variable = null;
	//    value = new Integer(bValue?1:0);
	//    name = sName;
	//  }
	//
	//  public VARToken(String sName,double fValue,int position) {
	//    super(Token.VAR,position);
	//    variable = null;
	//    value = new Double(fValue);
	//    name = sName;
	//  }
	//
	//  public VARToken(String sName,String sValue,int position) {
	//    super(Token.VAR,position);
	//    variable = null;
	//    value = new String(sValue);
	//    name = sName;
	//  }

	/**
	 * Uses contextID 0
	 */
	public static Object getValue(Variable v) {
		int[] ifInt = new int[1];
		float[] ifFloat = new float[1];
		Object[] ifObj = new Object[1];
		int which = v.getValue(ifInt, ifFloat, ifObj, 0);
		if (which == 0) {
			return ifFloat[0];
		}
		if (which == 1) {
			return ifInt[0];
		}
		return ifObj[0];
	}

	private int[][] intArrays = new int[1][1];
	private float[][] floatArrays = new float[1][1];
	private Object[][] objectArrays = new Object[1][1];
	public Object evaluate(int contextID)
			throws XUndefinedVariable {
		int i = contextID;
		//Object oValue = value;
		//if (oValue != null) return oValue;
		//if (variable != null) return variable.getValue();
		if (variable == null)
			throw new XUndefinedVariable(getPosition(), name);
		//return oValue;
		int whichType = variable.getValue(intArrays[i], floatArrays[i],
				objectArrays[i], contextID);
		if (whichType == 0) {
			return floatArrays[i];
		} else if (whichType == 1) {
			return intArrays[i];
		} else {
			return objectArrays[i];
		}
	}

	//  boolean isConstant() {
	//    return value != null;
	//  }

}