Attempts to parse an RGB triplet or an RGBA quadruplet from the string. - Java 2D Graphics

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Description

Attempts to parse an RGB triplet or an RGBA quadruplet from the string.

Demo Code

/**/*from   w ww .j ava2s.c o  m*/
 * Copyright 1998-2008, CHISEL Group, University of Victoria, Victoria, BC, Canada.
 * All rights reserved.
 */
//package com.java2s;
import java.awt.Color;

public class Main {
    /**
     * Attempts to parse an RGB triplet or an RGBA quadruplet from the string.
     * It searches through each character and tries to pull out 3 or 4 integers (between 0-255)
     * to use for red, green, blue, and alpha.
     * @param value the string to parse
     * @return the {@link Color} or null
     */
    public static Color rgbStringToColor(String value) {
        Color c = null;
        if ((value != null) && (value.length() > 0)) {
            int[] rgba = { -1, -1, -1, 255 };
            StringBuffer buffer = new StringBuffer(3);
            ;
            boolean inNumber = false;
            int index = 0;
            try {
                if (Character.isDigit(value.charAt(value.length() - 1))) {
                    // handles the case where the last character is a number
                    value = value + " ";
                }
                for (int i = 0; (i < value.length())
                        && (index < rgba.length); i++) {
                    char ch = value.charAt(i);
                    if (Character.isDigit(ch)) {
                        inNumber = true;
                        buffer.append(ch);
                    } else if (inNumber) {
                        inNumber = false;
                        int num = Integer.parseInt(buffer.toString());
                        num = Math.max(0, Math.min(255, num));
                        rgba[index++] = num;
                        buffer = new StringBuffer(3);
                    }
                }
                if (index >= 3) {
                    c = new Color(rgba[0], rgba[1], rgba[2], rgba[3]);
                }
            } catch (NumberFormatException ignore) {
            }
        }
        return c;
    }
}

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