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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 java.util.HashMap;
import java.util.Map;

public class OperatorFormats {
	
	public static final String SMALLER = "<";
	
	public static final String SMALLER_EQUAL = "<=";
	
	public static final String EQUAL = "==";
	
	public static final String NOT_EQUAL = "!=";
	
	public static final String LARGER = ">";
	
	public static final String LARGER_EQUAL = ">=";
	
	public static final String IN_INTERVAL = "[]";
	
	public static final String NOT_IN_INTERVAL = "][";
	
	public static final Map descriptors = new HashMap();
	static {
		descriptors.put(SMALLER, "Attribute value is smaller than a comparator.");
		descriptors.put(SMALLER_EQUAL, "Attribute value is smaller than or equal a comparator.");
		descriptors.put(EQUAL, "Attribute value equals a comparator.");
		descriptors.put(NOT_EQUAL, "Attribute value does not equal a comparator.");
		descriptors.put(LARGER, "Attribute value is larger than a comparator.");
		descriptors.put(LARGER_EQUAL, "Attribute value is larger than or equal a comparator.");
		descriptors.put(IN_INTERVAL, "Attribute value lies within a specific interval.");
		descriptors.put(NOT_IN_INTERVAL, "Attribute value does not lie within a specific interval.");
	}
	
	public static final String COMPARISON_FORMAT = "%%s %s %%s";
	
	public static final String IN_INTERVAL_FORMAT = "%s ? [%s;%s]";
	
	public static final String NOT_IN_INTERVAL_FORMAT = "%s ? ]%s;%s[";
	
	public static String getDescriptor(Operator operator){
		return descriptors.get(operator.toString());
	}

}