/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.preference;
import java.util.Arrays;
import java.util.StringTokenizer;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.StringConverter;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
/**
* A utility class for dealing with preferences whose values are
* common SWT objects (color, points, rectangles, and font data).
* The static methods on this class handle the conversion between
* the SWT objects and their string representations.
* <p>
* Usage:
* <pre>
* IPreferenceStore store = ...;
* PreferenceConverter.setValue(store, "bg", new RGB(127,127,127));
* ...
* RBG bgColor = PreferenceConverter.getValue(store, "bg");
* </pre>
* </p>
* <p>
* This class contains static methods and fields only and cannot
* be instantiated.
* </p>
* Note: touching this class has the side effect of creating a display (static initializer).
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public class PreferenceConverter {
/**
* The default-default value for point preferences
* (the origin, <code>(0,0)</code>).
*/
public static final Point POINT_DEFAULT_DEFAULT = new Point(0, 0);
/**
* The default-default value for rectangle preferences
* (the empty rectangle <code>(0,0,0,0)</code>).
*/
public static final Rectangle RECTANGLE_DEFAULT_DEFAULT = new Rectangle(0,
0, 0, 0);
/**
* The default-default value for color preferences
* (black, <code>RGB(0,0,0)</code>).
*/
public static final RGB COLOR_DEFAULT_DEFAULT = new RGB(0, 0, 0);
private static final String ENTRY_SEPARATOR = ";"; //$NON-NLS-1$
/**
* The default-default value for <code>FontData[]</code> preferences.
*/
public static final FontData[] FONTDATA_ARRAY_DEFAULT_DEFAULT;
/**
* The default-default value for <code>FontData</code> preferences.
*/
public static final FontData FONTDATA_DEFAULT_DEFAULT;
static {
Display display = Display.getCurrent();
if (display == null) {
display = Display.getDefault ();
}
FONTDATA_ARRAY_DEFAULT_DEFAULT = display.getSystemFont().getFontData();
/**
* The default-default value for <code>FontData</code> preferences.
* This is left in for compatibility purposes. It is recommended that
* FONTDATA_ARRAY_DEFAULT_DEFAULT is actually used.
*/
FONTDATA_DEFAULT_DEFAULT = FONTDATA_ARRAY_DEFAULT_DEFAULT[0];
}
/* (non-Javadoc)
* private constructor to prevent instantiation.
*/
private PreferenceConverter() {
//no-op
}
/**
* Helper method to construct a color from the given string.
* @param value the indentifier for the color
* @return RGB
*/
private static RGB basicGetColor(String value) {
if (IPreferenceStore.STRING_DEFAULT_DEFAULT.equals(value)) {
return COLOR_DEFAULT_DEFAULT;
}
RGB color = StringConverter.asRGB(value, null);
if (color == null) {
return COLOR_DEFAULT_DEFAULT;
}
return color;
}
/**
* Helper method to construct a <code>FontData</code> from the given string.
* String is in the form FontData;FontData; in order that
* multiple FontDatas can be defined.
* @param value the identifier for the font
* @return FontData[]
*
* @since 3.0
*/
public static FontData[] basicGetFontData(String value) {
if (IPreferenceStore.STRING_DEFAULT_DEFAULT.equals(value)) {
return FONTDATA_ARRAY_DEFAULT_DEFAULT;
}
//Read in all of them to get the value
StringTokenizer tokenizer = new StringTokenizer(value, ENTRY_SEPARATOR);
int numTokens = tokenizer.countTokens();
FontData[] fontData = new FontData[numTokens];
for (int i = 0; i < numTokens; i++) {
try {
fontData[i] = new FontData(tokenizer.nextToken());
} catch (SWTException error) {
return FONTDATA_ARRAY_DEFAULT_DEFAULT;
} catch (IllegalArgumentException error) {
return FONTDATA_ARRAY_DEFAULT_DEFAULT;
}
}
return fontData;
}
/**
* Reads the supplied string and returns its corresponding
* FontData. If it cannot be read then the default FontData
* will be returned.
*
* @param fontDataValue the string value for the font data
* @return the font data
*/
public static FontData[] readFontData(String fontDataValue) {
return basicGetFontData(fontDataValue);
}
/**
* Helper method to construct a point from the given string.
* @param value
* @return Point
*/
private static Point basicGetPoint(String value) {
Point dp = new Point(POINT_DEFAULT_DEFAULT.x, POINT_DEFAULT_DEFAULT.y);
if (IPreferenceStore.STRING_DEFAULT_DEFAULT.equals(value)) {
return dp;
}
return StringConverter.asPoint(value, dp);
}
/**
* Helper method to construct a rectangle from the given string.
* @param value
* @return Rectangle
*/
private static Rectangle basicGetRectangle(String value) {
// We can't just return RECTANGLE_DEFAULT_DEFAULT because
// a rectangle object doesn't have value semantik.
Rectangle dr = new Rectangle(RECTANGLE_DEFAULT_DEFAULT.x,
RECTANGLE_DEFAULT_DEFAULT.y, RECTANGLE_DEFAULT_DEFAULT.width,
RECTANGLE_DEFAULT_DEFAULT.height);
if (IPreferenceStore.STRING_DEFAULT_DEFAULT.equals(value)) {
return dr;
}
return StringConverter.asRectangle(value, dr);
}
/**
* Returns the current value of the color-valued preference with the
* given name in the given preference store.
* Returns the default-default value (<code>COLOR_DEFAULT_DEFAULT</code>)
* if there is no preference with the given name, or if the current value
* cannot be treated as a color.
*
* @param store the preference store
* @param name the name of the preference
* @return the color-valued preference
*/
public static RGB getColor(IPreferenceStore store, String name) {
return basicGetColor(store.getString(name));
}
/**
* Returns the default value for the color-valued preference
* with the given name in the given preference store.
* Returns the default-default value (<code>COLOR_DEFAULT_DEFAULT</code>)
* is no default preference with the given name, or if the default
* value cannot be treated as a color.
*
* @param store the preference store
* @param name the name of the preference
* @return the default value of the preference
*/
public static RGB getDefaultColor(IPreferenceStore store, String name) {
return basicGetColor(store.getDefaultString(name));
}
/**
* Returns the default value array for the font-valued preference
* with the given name in the given preference store.
* Returns the default-default value (<code>FONTDATA_ARRAY_DEFAULT_DEFAULT</code>)
* is no default preference with the given name, or if the default
* value cannot be treated as font data.
*
* @param store the preference store
* @param name the name of the preference
* @return the default value of the preference
*/
public static FontData[] getDefaultFontDataArray(IPreferenceStore store,
String name) {
return basicGetFontData(store.getDefaultString(name));
}
/**
* Returns a single default value for the font-valued preference
* with the given name in the given preference store.
* Returns the default-default value (<code>FONTDATA_DEFAULT_DEFAULT</code>)
* is no default preference with the given name, or if the default
* value cannot be treated as font data.
* This method is provided for backwards compatibility. It is
* recommended that <code>getDefaultFontDataArray</code> is
* used instead.
*
* @param store the preference store
* @param name the name of the preference
* @return the default value of the preference
*/
public static FontData getDefaultFontData(IPreferenceStore store,
String name) {
return getDefaultFontDataArray(store, name)[0];
}
/**
* Returns the default value for the point-valued preference
* with the given name in the given preference store.
* Returns the default-default value (<code>POINT_DEFAULT_DEFAULT</code>)
* is no default preference with the given name, or if the default
* value cannot be treated as a point.
*
* @param store the preference store
* @param name the name of the preference
* @return the default value of the preference
*/
public static Point getDefaultPoint(IPreferenceStore store, String name) {
return basicGetPoint(store.getDefaultString(name));
}
/**
* Returns the default value for the rectangle-valued preference
* with the given name in the given preference store.
* Returns the default-default value (<code>RECTANGLE_DEFAULT_DEFAULT</code>)
* is no default preference with the given name, or if the default
* value cannot be treated as a rectangle.
*
* @param store the preference store
* @param name the name of the preference
* @return the default value of the preference
*/
public static Rectangle getDefaultRectangle(IPreferenceStore store,
String name) {
return basicGetRectangle(store.getDefaultString(name));
}
/**
* Returns the current value of the font-valued preference with the
* given name in the given preference store.
* Returns the default-default value (<code>FONTDATA_ARRAY_DEFAULT_DEFAULT</code>)
* if there is no preference with the given name, or if the current value
* cannot be treated as font data.
*
* @param store the preference store
* @param name the name of the preference
* @return the font-valued preference
*/
public static FontData[] getFontDataArray(IPreferenceStore store,
String name) {
return basicGetFontData(store.getString(name));
}
/**
* Returns the current value of the first entry of the
* font-valued preference with the
* given name in the given preference store.
* Returns the default-default value (<code>FONTDATA_ARRAY_DEFAULT_DEFAULT</code>)
* if there is no preference with the given name, or if the current value
* cannot be treated as font data.
* This API is provided for backwards compatibility. It is
* recommended that <code>getFontDataArray</code> is used instead.
*
* @param store the preference store
* @param name the name of the preference
* @return the font-valued preference
*/
public static FontData getFontData(IPreferenceStore store, String name) {
return getFontDataArray(store, name)[0];
}
/**
* Returns the current value of the point-valued preference with the
* given name in the given preference store.
* Returns the default-default value (<code>POINT_DEFAULT_DEFAULT</code>)
* if there is no preference with the given name, or if the current value
* cannot be treated as a point.
*
* @param store the preference store
* @param name the name of the preference
* @return the point-valued preference
*/
public static Point getPoint(IPreferenceStore store, String name) {
return basicGetPoint(store.getString(name));
}
/**
* Returns the current value of the rectangle-valued preference with the
* given name in the given preference store.
* Returns the default-default value (<code>RECTANGLE_DEFAULT_DEFAULT</code>)
* if there is no preference with the given name, or if the current value
* cannot be treated as a rectangle.
*
* @param store the preference store
* @param name the name of the preference
* @return the rectangle-valued preference
*/
public static Rectangle getRectangle(IPreferenceStore store, String name) {
return basicGetRectangle(store.getString(name));
}
/**
* Sets the default value of the preference with the given name
* in the given preference store. As FontDatas are stored as
* arrays this method is only provided for backwards compatibility.
* Use <code>setDefault(IPreferenceStore, String, FontData[])</code>
* instead.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new default value of the preference
*/
public static void setDefault(IPreferenceStore store, String name,
FontData value) {
FontData[] fontDatas = new FontData[1];
fontDatas[0] = value;
setDefault(store, name, fontDatas);
}
/**
* Sets the default value of the preference with the given name
* in the given preference store.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new default value of the preference
*/
public static void setDefault(IPreferenceStore store, String name,
FontData[] value) {
store.setDefault(name, getStoredRepresentation(value));
}
/**
* Sets the default value of the preference with the given name
* in the given preference store.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new default value of the preference
*/
public static void setDefault(IPreferenceStore store, String name,
Point value) {
store.setDefault(name, StringConverter.asString(value));
}
/**
* Sets the default value of the preference with the given name
* in the given preference store.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new default value of the preference
*/
public static void setDefault(IPreferenceStore store, String name,
Rectangle value) {
store.setDefault(name, StringConverter.asString(value));
}
/**
* Sets the default value of the preference with the given name
* in the given preference store.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new default value of the preference
*/
public static void setDefault(IPreferenceStore store, String name, RGB value) {
store.setDefault(name, StringConverter.asString(value));
}
/**
* Sets the current value of the preference with the given name
* in the given preference store.
* <p>
* Included for backwards compatibility. This method is equivalent to
* </code>setValue(store, name, new FontData[]{value})</code>.
* </p>
*
* @param store the preference store
* @param name the name of the preference
* @param value the new current value of the preference
*/
public static void setValue(IPreferenceStore store, String name,
FontData value) {
setValue(store, name, new FontData[] { value });
}
/**
* Sets the current value of the preference with the given name
* in the given preference store. This method also sets the corresponding
* key in the JFace font registry to the value and fires a
* property change event to listeners on the preference store.
*
* <p>
* Note that this API does not update any other settings that may
* be dependant upon it. Only the value in the preference store
* and in the font registry is updated.
* </p>
* @param store the preference store
* @param name the name of the preference
* @param value the new current value of the preference
*
* @see #putValue(IPreferenceStore, String, FontData[])
*/
public static void setValue(IPreferenceStore store, String name,
FontData[] value) {
FontData[] oldValue = getFontDataArray(store, name);
// see if the font has changed
if (!Arrays.equals(oldValue, value)) {
store.putValue(name, getStoredRepresentation(value));
JFaceResources.getFontRegistry().put(name, value);
store.firePropertyChangeEvent(name, oldValue, value);
}
}
/**
* Sets the current value of the preference with the given name
* in the given preference store. This method does not update
* the font registry or fire a property change event.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new current value of the preference
*
* @see PreferenceConverter#setValue(IPreferenceStore, String, FontData[])
*/
public static void putValue(IPreferenceStore store, String name,
FontData[] value) {
FontData[] oldValue = getFontDataArray(store, name);
// see if the font has changed
if (!Arrays.equals(oldValue, value)) {
store.putValue(name, getStoredRepresentation(value));
}
}
/**
* Returns the stored representation of the given array of FontData objects.
* The stored representation has the form FontData;FontData;
* Only includes the non-null entries.
*
* @param fontData the array of FontData objects
* @return the stored representation of the FontData objects
* @since 3.0
*/
public static String getStoredRepresentation(FontData[] fontData) {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < fontData.length; i++) {
if (fontData[i] != null) {
buffer.append(fontData[i].toString());
buffer.append(ENTRY_SEPARATOR);
}
}
return buffer.toString();
}
/**
* Sets the current value of the preference with the given name
* in the given preference store.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new current value of the preference
*/
public static void setValue(IPreferenceStore store, String name, Point value) {
Point oldValue = getPoint(store, name);
if (oldValue == null || !oldValue.equals(value)) {
store.putValue(name, StringConverter.asString(value));
store.firePropertyChangeEvent(name, oldValue, value);
}
}
/**
* Sets the current value of the preference with the given name
* in the given preference store.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new current value of the preference
*/
public static void setValue(IPreferenceStore store, String name,
Rectangle value) {
Rectangle oldValue = getRectangle(store, name);
if (oldValue == null || !oldValue.equals(value)) {
store.putValue(name, StringConverter.asString(value));
store.firePropertyChangeEvent(name, oldValue, value);
}
}
/**
* Sets the current value of the preference with the given name
* in the given preference store.
*
* @param store the preference store
* @param name the name of the preference
* @param value the new current value of the preference
*/
public static void setValue(IPreferenceStore store, String name, RGB value) {
RGB oldValue = getColor(store, name);
if (oldValue == null || !oldValue.equals(value)) {
store.putValue(name, StringConverter.asString(value));
store.firePropertyChangeEvent(name, oldValue, value);
}
}
}