RCP一个自定义的图片处理管理ImageManager
在RCP开发中图片（Image），打印，字体（Font），Cursor在使用必须遵守“谁创建，谁销毁”策略。自己写的图片管理
资源管理通过ImageRegistry进行操纵。
package com.vnvntrip.plugin.dev.commons;
import java.io.File;
import java.net.URL;
import java.util.logging.Logger;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.osgi.framework.Bundle;
import com.vnvntrip.plugin.dev.Activator;
import com.vnvntrip.plugin.dev.commons.FilenameUtils;
/**
*
* 由于在swt/jface中图片，字体，打印等的资源占用资源比较多，一般采用“谁创建，谁销毁”的方案
* 采用ImageRegistry 管理图片的各种的信息
* @author longgangbai
*
*/
public class ImageManager {
public static final Logger logger=Logger.getLogger(ImageManager.class.getName());
private static ImageRegistry registry=new ImageRegistry();
/**
* 加载图片的信息
*/
static{
initRegistry();
}
/**
* 获取图片的信息
* @param key
* @return
*/
public static Image getImage(String key)
{
Image image=registry.get(key);
if(image==null)
{
image=ImageDescriptor.getMissingImageDescriptor().createImage();
}
return image;
}
/**
* 获取的图片的资源的信息
* @param key
* @return
*/
public static ImageDescriptor getDescriptor(String key)
{
ImageDescriptor descriptor=registry.getDescriptor(key);
if(descriptor==null){
descriptor=ImageDescriptor.getMissingImageDescriptor();
}
return descriptor;
}
/**
* 加载图片资源
*/
private static void initRegistry(){
Bundle bundle=Platform.getBundle(Activator.PLUGIN_ID);
URL url=bundle.getEntry("icons");
try {
url=FileLocator.toFileURL(url);
File directory=new File(url.getPath());
File[] files=directory.listFiles();
for (File file : files) {
String path="icons"+File.separator+file.getName();
registry.put(FilenameUtils.getBaseName(file.getName()), Activator.getImageDescriptor(path));
}
} catch (Exception e) {
logger.info(e.getMessage());
}
}
}
一个工具类FilenameUtils类。
package com.vnvntrip.plugin.dev.commons;
import java.io.File;
import java.util.ArrayList;
/**
* 文件处理工具类
* @author longgangbai
*
*/
public class FilenameUtils
{
public static final char EXTENSION_SEPARATOR = 46;
public static final String EXTENSION_SEPARATOR_STR = new Character('.').toString();
@SuppressWarnings("unused")
private static final char WINDOWS_SEPARATOR = 92;
private static final char SYSTEM_SEPARATOR = File.separatorChar;
@SuppressWarnings("unused")
private static final char OTHER_SEPARATOR;
static boolean isSystemWindows()
{
return (SYSTEM_SEPARATOR == '\\');
}
private static boolean isSeparator(char ch)
{
return ((ch == '/') || (ch == '\\'));
}
public static String separatorsToUnix(String path)
{
if ((path == null) || (path.indexOf(92) == -1))
return path;
return path.replace('\\', '/');
}
public static String separatorsToWindows(String path)
{
if ((path == null) || (path.indexOf(47) == -1))
return path;
return path.replace('/', '\\');
}
public static String separatorsToSystem(String path)
{
if (path == null)
return null;
if (isSystemWindows())
return separatorsToWindows(path);
return separatorsToUnix(path);
}
public static int getPrefixLength(String filename)
{
if (filename == null)
return -1;
int len = filename.length();
if (len == 0)
return 0;
char ch0 = filename.charAt(0);
if (ch0 == ':')
return -1;
if (len == 1) {
if (ch0 == '~')
return 2;
return ((isSeparator(ch0)) ? 1 : 0);
}
if (ch0 == '~') {
int posUnix = filename.indexOf(47, 1);
int posWin = filename.indexOf(92, 1);
if ((posUnix == -1) && (posWin == -1))
return (len + 1);
posUnix = (posUnix == -1) ? posWin : posUnix;
posWin = (posWin == -1) ? posUnix : posWin;
return (Math.min(posUnix, posWin) + 1);
}
char ch1 = filename.charAt(1);
if (ch1 == ':') {
ch0 = Character.toUpperCase(ch0);
if ((ch0 >= 'A') && (ch0 <= 'Z')) {
if ((len == 2) || (!(isSeparator(filename.charAt(2)))))
return 2;
return 3;
}
return -1;
}
if ((isSeparator(ch0)) && (isSeparator(ch1))) {
int posUnix = filename.indexOf(47, 2);
int posWin = filename.indexOf(92, 2);
if (((posUnix == -1) && (posWin == -1)) || (posUnix == 2) || (posWin == 2))
return -1;
posUnix = (posUnix == -1) ? posWin : posUnix;
posWin = (posWin == -1) ? posUnix : posWin;
return (Math.min(posUnix, posWin) + 1);
}
return ((isSeparator(ch0)) ? 1 : 0);
}
public static int indexOfLastSeparator(String filename)
{
if (filename == null)
return -1;
int lastUnixPos = filename.lastIndexOf(47);
int lastWindowsPos = filename.lastIndexOf(92);
return Math.max(lastUnixPos, lastWindowsPos);
}
public static int indexOfExtension(String filename)
{
if (filename == null)
return -1;
int extensionPos = filename.lastIndexOf(46);
int lastSeparator = indexOfLastSeparator(filename);
return ((lastSeparator > extensionPos) ? -1 : extensionPos);
}
public static String getPrefix(String filename)
{
if (filename == null)
return null;
int len = getPrefixLength(filename);
if (len < 0)
return null;
if (len > filename.length())
return filename + '/';
return filename.substring(0, len);
}
public static String getPath(String filename)
{
return doGetPath(filename, 1);
}
public static String getPathNoEndSeparator(String filename)
{
return doGetPath(filename, 0);
}
private static String doGetPath(String filename, int separatorAdd)
{
if (filename == null)
return null;
int prefix = getPrefixLength(filename);
if (prefix < 0)
return null;
int index = indexOfLastSeparator(filename);
if ((prefix >= filename.length()) || (index < 0))
return "";
return filename.substring(prefix, index + separatorAdd);
}
public static String getFullPath(String filename)
{
return doGetFullPath(filename, true);
}
public static String getFullPathNoEndSeparator(String filename)
{
return doGetFullPath(filename, false);
}
private static String doGetFullPath(String filename, boolean includeSeparator)
{
if (filename == null)
return null;
int prefix = getPrefixLength(filename);
if (prefix < 0)
return null;
if (prefix >= filename.length()) {
if (includeSeparator)
return getPrefix(filename);
return filename;
}
int index = indexOfLastSeparator(filename);
if (index < 0)
return filename.substring(0, prefix);
int end = index + ((includeSeparator) ? 1 : 0);
return filename.substring(0, end);
}
public static String getName(String filename)
{
if (filename == null)
return null;
int index = indexOfLastSeparator(filename);
return filename.substring(index + 1);
}
public static String getBaseName(String filename)
{
return removeExtension(getName(filename));
}
public static String getExtension(String filename)
{
if (filename == null)
return null;
int index = indexOfExtension(filename);
if (index == -1)
return "";
return filename.substring(index + 1);
}
public static String removeExtension(String filename)
{
if (filename == null)
return null;
int index = indexOfExtension(filename);
if (index == -1)
return filename;
return filename.substring(0, index);
}
public static boolean isExtension(String filename, String extension)
{
if (filename == null)
return false;
if ((extension == null) || (extension.length() == 0))
return (indexOfExtension(filename) == -1);
String fileExt = getExtension(filename);
return fileExt.equals(extension);
}
public static boolean isExtension(String filename, String[] extensions)
{
if (filename == null)
return false;
if ((extensions == null) || (extensions.length == 0))
return (indexOfExtension(filename) == -1);
String fileExt = getExtension(filename);
for (int i = 0; i < extensions.length; ++i)
if (fileExt.equals(extensions[i]))
return true;
return false;
}
static String[] splitOnTokens(String text)
{
if ((text.indexOf("?") == -1) && (text.indexOf("*") == -1)) {
return new String[] { text };
}
char[] array = text.toCharArray();
ArrayList list = new ArrayList();
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < array.length; ++i)
if ((array[i] == '?') || (array[i] == '*')) {
if (buffer.length() != 0) {
list.add(buffer.toString());
buffer.setLength(0);
}
if (array[i] == '?')
list.add("?");
else if ((list.size() == 0) || ((i > 0) && (!(list.get(list.size() - 1).equals("*")))))
{
list.add("*");
}
} else {
buffer.append(array[i]);
}
if (buffer.length() != 0) {
list.add(buffer.toString());
}
return ((String[])(String[])list.toArray(new String[list.size()]));
}
static
{
if (isSystemWindows())
OTHER_SEPARATOR = '/';
else
OTHER_SEPARATOR = '\\';
}
}