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JIDE Common Layer (Professional Swing Components)
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/*
 * @(#)RangeConverter.java 5/22/2014
 *
 * Copyright 2002 - 2014 JIDE Software Inc. All rights reserved.
 */
package com.jidesoft.converter;

import com.jidesoft.range.Range;

import java.text.MessageFormat;
import java.util.Locale;

/**
 * An abstract class that is extended by any converters that convert to/from an array-like format, such as 1, 2, 3.
 * Examples are Point. Point(100, 200) can convert to/from "100, 200" 
 You have the choice of what the separator is;
 * separator is the ", " in the Point example above.
 */
public class RangeConverter implements ObjectConverter {
    private Class _elementClass;

    public static final ConverterContext CONTEXT_RANGE = new ConverterContext("Range");
    public static final ConverterContext CONTEXT_MULTIPLE = new ConverterContext("Multiple");

    /**
     * Creates an ArrayConverter.
     *
     * @param elementClass class of the array element. Assume all elements have the same class type. If not, use the
     *                     constructor which takes Class[] as parameter.
     */
    public RangeConverter(Class elementClass) {
        _elementClass = elementClass;
    }

    /**
     * Converts from array to string by concating them with separators.
     *
     * @param objects an array of objects
     * @param context converter context
     * @return string all objects concatenated with separators
     */
    public String arrayToString(Object[] objects, ConverterContext context) {
        if (objects.length > 1) {
            if (CONTEXT_RANGE.equals(context)) {
                String s = Resource.getResourceBundle(Locale.getDefault()).getString("Range.range");
                return MessageFormat.format(s, toString(0, objects[0], context), toString(1, objects[1], context));
            }
            else {
                return Resource.getResourceBundle(Locale.getDefault()).getString("Range.multiple");
            }
        }
        else if (objects.length == 1) {
            return toString(0, objects[0], context);
        }
        return "";
    }

    protected String toString(int i, Object o, ConverterContext context) {
        return ObjectConverterManager.toString(o, _elementClass, context);
    }

    /**
     * Converts from string to an array of objects, using separator to separate the string.
     *
     * @param string  string to be converted
     * @param context converter context
     * @return the array
     */
    public Object[] arrayFromString(String string, ConverterContext context) {
        return null;
    }

    protected Object fromString(int i, String s, ConverterContext context) {
        return ObjectConverterManager.fromString(s, _elementClass, context);
    }

    public String toString(Object object, ConverterContext context) {
        if (object instanceof Range) {
            Range range = (Range) object;
            if (range.size() == 0) {
                return arrayToString(new Object[]{range.lower()}, context);
            }
            return arrayToString(new Object[]{range.lower(), range.upper()}, context);
        }
        else {
            return "";
        }
    }

    public boolean supportToString(Object object, ConverterContext context) {
        return true;
    }

    public Object fromString(String string, ConverterContext context) {
        if (string == null || string.trim().length() == 0) {
            return null;
        }
        Object[] objects = arrayFromString(string, context);
        if (objects == null) return null;
        else if (objects.length == 1) {
            return null;
        }
        else if (objects.length >= 2) {
            return null;
        }
        return null;
    }

    public boolean supportFromString(String string, ConverterContext context) {
        return false;
    }
}