Java项目classPath的添加

//	import org.eclipse.jem.workbench.utility.JemProjectUtilities;
//	import org.eclipse.jdt.core.IJavaProject;
//	import org.eclipse.jdt.core.IClasspathEntry;
	/**
	 * Append one IClasspathEntry to the build path of the passed project. If a
	 * classpath entry having the same path as the parameter already exists,
	 * then does nothing.
	 */
	public static void appendJavaClassPath(IProject p, IClasspathEntry newEntry) throws JavaModelException {
		IJavaProject javaProject = JemProjectUtilities.getJavaProject(p);
		if (javaProject == null)
			return;
		IClasspathEntry[] classpath = javaProject.getRawClasspath();
		List newPathList = new ArrayList(classpath.length);
		for (int i = 0; i < classpath.length; i++) {
			IClasspathEntry entry = classpath[i];
			// fix dup class path entry for .JETEmitter project
			// Skip the entry to be added if it already exists
			if (Platform.getOS().equals(Platform.OS_WIN32)) {
				if (!entry.getPath().toString().equalsIgnoreCase(newEntry.getPath().toString()))
					newPathList.add(entry);
				else
					return;
			} else {
				if (!entry.getPath().equals(newEntry.getPath()))
					newPathList.add(entry);
				else
					return;
			}
		}
		newPathList.add(newEntry);
		IClasspathEntry[] newClasspath = (IClasspathEntry[]) newPathList
				.toArray(new IClasspathEntry[newPathList.size()]);
		javaProject.setRawClasspath(newClasspath, new NullProgressMonitor());
	}