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Jiffle is a raster algebra language that can be used to create new images from logical and mathematical expressions involving source images and user defined variables. It is intended to let users concentrate on algorithms rather than tedious boiler-plate code.

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/*
 * Copyright 2011 Michael Bedward
 * 
 * This file is part of jai-tools.
 *
 * jai-tools 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 3 of the 
 * License, or (at your option) any later version.
 *
 * jai-tools 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 jai-tools.  If not, see .
 * 
 */

package jaitools.jiffle.parser;

import java.util.Arrays;
import java.util.List;

/**
 * Holds information about a supported Jiffle script option.
 * 
 * @author Michael Bedward
 * @since 1.1
 * @version $Id: OptionInfo.java 1461 2011-02-26 11:40:24Z michael.bedward $
 */
class OptionInfo {
    
    public static final String ANY_STRING = "ANY_STRING";
    public static final String ANY_NUMBER = "ANY_NUMBER";
    public static final String NULL_KEYWORD = "NULL_KEYWORD";

    private final String name;
    private final List validValues;
    
    public OptionInfo(String name, String[] validValues) {
        this.name = name;
        this.validValues = Arrays.asList(validValues);
    }

    public String getName() {
        return name;
    }

    public boolean isValidValue(String value) {
        // Is it the null keyword ?
        if ("null".equalsIgnoreCase(value)) {
            return validValues.contains(NULL_KEYWORD);
        }
        
        // Is it a named constant ?
        if (ConstantLookup.isDefined(value)) {
            return validValues.contains(ANY_NUMBER);
        }
        
        // Is it a number ?
        boolean numeric = true;
        try {
            Double.parseDouble(value);
        } catch (NumberFormatException ex) {
            numeric = false;
        }
        
        if (numeric) {
            return validValues.contains(ANY_NUMBER);
        }
        
        // Final test
        return validValues.contains(ANY_STRING);
    }
    
}