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package jsp2_1.examples.elresolver;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.StringTokenizer;
/**
* Implicit object that ${Color} resolves to.
*
* @author Mark Roth
*/
public class ColorImplicitObject {
/** Set of colors by name */
private static HashMap colorNames = null;
/**
* Returns a color from an HTML-style hex String, e.g. #f0f0f0
*/
public static ColorRGB fromHex(String hex) {
return fromColor(java.awt.Color.decode(hex));
}
/**
* Returns a color from a java.awt.Color object.
*/
public static ColorRGB fromColor(java.awt.Color color) {
return new ColorRGB(color.getRed(), color.getGreen(), color.getBlue());
}
/**
* Returns a color from a name. Uses the resource rgb.txt to load
* color names.
*/
public static ColorRGB fromName(String name) {
if(colorNames == null) {
loadColorNames();
}
return (ColorRGB)colorNames.get(name);
}
public String toString() {
return "Color Implicit Object";
}
/**
* Package-scope method to get list of all color names
*/
static Iterator colorNameIterator() {
if(colorNames == null) {
loadColorNames();
}
return colorNames.keySet().iterator();
}
/**
* Loads colors from resource rgb.txt and converts them to
* instances of ColorRGB.
*/
private synchronized static void loadColorNames() {
if(colorNames == null) {
colorNames = new HashMap();
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
ColorImplicitObject.class.getResourceAsStream(
"/jsp2_1/examples/elresolver/rgb.txt")));
String line;
while((line = in.readLine()) != null) {
if(!line.startsWith("!")) {
String colorText = line.substring(0, 12);
String colorName = line.substring(12).trim();
StringTokenizer st = new StringTokenizer(
colorText, " ");
int red = Integer.parseInt(st.nextToken().trim());
int green = Integer.parseInt(st.nextToken().trim());
int blue = Integer.parseInt(st.nextToken().trim());
colorNames.put(colorName, new ColorRGB(red, green,
blue));
}
}
in.close();
}
catch(IOException e) {
throw new RuntimeException("Could not load rgb.txt", e);
}
}
}
/**
* Color whose red property has been specified
* (e.g. ${Color[100]})
*/
public static class ColorR {
private int red;
public ColorR(int red) {
// Handle low or high values robustly.
if(red < 0) red = 0;
if(red > 255) red = 255;
this.red = red;
}
public int getRed() {
return red;
}
public void setRed(int r) {
red = r;
}
public String toString() {
return "Color(" + red + ", ?, ?)";
}
}
/**
* Color whose red and green properties have been specified
* (e.g. ${Color[100][150]})
*/
public static class ColorRG
extends ColorR
{
private int green;
public ColorRG(int red, int green) {
super(red);
// Handle low or high values robustly.
if(green < 0) green = 0;
if(green > 255) green = 255;
this.green = green;
}
public int getGreen() {
return green;
}
public void setGreen(int g) {
green = g;
}
public String toString() {
return "Color(" + getRed() + ", " + green + ", ?)";
}
}
public static class ColorRGB
extends ColorRG
{
private int blue;
public ColorRGB(int red, int green, int blue) {
super(red, green);
// Handle low or high values robustly.
if(blue < 0) blue = 0;
if(blue > 255) blue = 255;
this.blue = blue;
}
public int getBlue() {
return blue;
}
public void setBlue(int b) {
blue = blue;
}
public java.awt.Color getColor() {
return new java.awt.Color(getRed(), getGreen(), getBlue());
}
public ColorRGB getDarker() {
java.awt.Color darkerColor = getColor().darker();
return fromColor(darkerColor);
}
public ColorRGB getBrighter() {
java.awt.Color brighterColor = getColor().brighter();
return fromColor(brighterColor);
}
public String getHex() {
return "#" + toHex(getRed()) + toHex(getGreen()) +
toHex(getBlue());
}
private String toHex(int i) {
String result;
if(i < 16) {
result = "0" + Integer.toHexString(i);
}
else {
result = Integer.toHexString(i);
}
return result;
}
public String toString() {
return "Color(" + getRed() + ", " + getGreen() + ", " + blue + ")";
}
}
}
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