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TOVAL comprises a set of java classes for common programming issues. It includes utils for arrays, lists, sets and collections for convenient handling and modification, but also support for mathematic definitions concerning logic (clauses + resolution) together with some algorithms for permutations, powersets and resolution. Additionally it contains a number of types for multisets, matrices with object keys and much more.

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package de.invation.code.toval.constraint;

import de.invation.code.toval.validate.ParameterException;
import de.invation.code.toval.validate.ParameterException.ErrorCode;

public class StringConstraint extends AbstractConstraint {

	public StringConstraint(String element, StringOperator stringOperator, String... parameters) throws ParameterException{
		super(element, stringOperator, parameters);
	}	

	public static StringConstraint parse(String constraint) throws ParameterException {
		
		//Find element
		int endElementIndex = constraint.indexOf(" ");
		if(endElementIndex == -1)
			throw new ParameterException(ErrorCode.INCOMPATIBILITY);
		String element = constraint.substring(0, endElementIndex);
		
		//Find operator
		if(constraint.length()-endElementIndex <2)
			throw new ParameterException(ErrorCode.INCOMPATIBILITY);
		String restString = constraint.substring(endElementIndex+1);
		int endOperatorIndex = restString.indexOf(" ");
		if(endOperatorIndex == -1)
			throw new ParameterException(ErrorCode.INCOMPATIBILITY);
		String operatorString = restString.substring(0, endOperatorIndex);
		StringOperator operator = StringOperator.parse(operatorString);
		if(operator == null)
			throw new ParameterException(ErrorCode.INCOMPATIBILITY);
		
		//Find parameter
		if(restString.length()-endOperatorIndex <2)
			throw new ParameterException(ErrorCode.INCOMPATIBILITY);
		String parameter = restString.substring(endOperatorIndex+1);
		
		return new StringConstraint(element, operator, parameter);
	}
	

	@Override
	public StringOperator getOperator() {
		return (StringOperator) super.getOperator();
	}

	@Override
	public StringConstraint clone() {
		StringConstraint result = null;
		try {
			result = new StringConstraint(new String(element), getOperator(), parameters.clone());
		} catch (ParameterException e) {
			e.printStackTrace();
		}
		return result;
	}

//	public static void main(String[] args) throws Exception {
//		StringConstraint c = new StringConstraint("name", StringOperator.NOT_EQUAL, "Gerd");
//		System.out.println(c);
//		System.out.println(c.validate(12));
//	}
//	
}