SenScriptEvalCondition.java

package senscript;

import device.SensorNode;

public class SenScriptEvalCondition {
	
	protected SensorNode sensor;
	
	public SenScriptEvalCondition(SensorNode sensor){		
		this.sensor = sensor;
	}
	
	public SenScriptConditionElement initCondition(String condition) {		
		condition = condition.replaceAll(" ", "");
		int frst = condition.indexOf("(");
		int last = condition.lastIndexOf(")");
		
		if (frst == 0 && last == condition.length()-1)
			if (condition.indexOf("(", frst+1) < condition.indexOf(")", frst+1))
				condition = condition.substring(frst+1,last);
		
		if (getNbConditions(condition) == 0) {
			SenScriptConditionElementEnd cond = new SenScriptConditionElementEnd(this.sensor, condition);
			return cond;
		}
		
		String[] tCondition =  getTwoParts(condition);
		
		if (tCondition == null)
			return null;
		
		if (tCondition[2] == "&&"){
			SenScriptConditionElementAnd cond = new SenScriptConditionElementAnd(initCondition(tCondition[0]), initCondition(tCondition[1]));
			return cond;
		}
		
		if (tCondition[2] == "||"){
			SenScriptConditionElementOr cond = new SenScriptConditionElementOr(initCondition(tCondition[0]), initCondition(tCondition[1]));
			return cond;
		}
		
		return null;
	}
	
	
	public String [] getTwoParts(String condition) {		
		int idxAnd ;
		String res [] = new String[3];
		String block1 ;
		String block2 ;		
		
		int fromIndex = 0; 
		
		idxAnd = condition.indexOf("&&", fromIndex);
		while(idxAnd != -1) {
			block1 = condition.substring(0, idxAnd);
			block2 = condition.substring(idxAnd+2, condition.length());			
			res[0] = block1;
			res[1] = block2;
			res[2] = "&&";
			if (correctNbBrackets(block1) && correctNbBrackets(block2))
				return res;
			fromIndex = idxAnd+2;
			idxAnd = condition.indexOf("&&", fromIndex);
		}
		
		idxAnd = condition.indexOf("||");
		while(idxAnd != -1) {
			block1 = condition.substring(0, idxAnd);
			block2 = condition.substring(idxAnd+2, condition.length());
			res[0] = block1;
			res[1] = block2;
			res[2] = "||";	
			if (correctNbBrackets(block1) && correctNbBrackets(block2))
				return res;
			fromIndex = idxAnd+2;
			idxAnd = condition.indexOf("||", fromIndex);
		}
		
		return null;
	}
	
	public int getNbConditions(String condition){
		int compBrOPen = 0;
		int compBrClose = 0;
		
		for(int i=0; i<condition.length();i++){			
			if (condition.charAt(i) == '(')
				compBrOPen++;
			else if (condition.charAt(i) == ')'){
					compBrClose++;
			}
		}
		
		if (compBrOPen ==  compBrClose)
			return compBrOPen;
		
		return -1;
	}
	
	public boolean correctNbBrackets(String condition){
		int compBrOPen = 0;
		int compBrClose = 0;

		for(int i=0; i<condition.length();i++){
			if (condition.charAt(i) == '(')
				compBrOPen++;
			else if (condition.charAt(i) == ')') {
					compBrClose++;
			}
		}
	
		if (compBrOPen ==  compBrClose)
			return true;
		
		return false;
	}
	
}