rap java code for select2 combo replacement

gistfile1.java

/*******************************************************************************
 
 ******************************************************************************/
package de.eiswind.mango.widgets.select2;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.rap.json.JsonArray;
import org.eclipse.rap.json.JsonObject;
import org.eclipse.rap.json.JsonValue;
import org.eclipse.rap.rwt.RWT;
import org.eclipse.rap.rwt.client.service.JavaScriptLoader;
import org.eclipse.rap.rwt.lifecycle.WidgetUtil;
import org.eclipse.rap.rwt.remote.AbstractOperationHandler;
import org.eclipse.rap.rwt.remote.Connection;
import org.eclipse.rap.rwt.remote.OperationHandler;
import org.eclipse.rap.rwt.remote.RemoteObject;
import org.eclipse.rap.rwt.service.ResourceManager;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.Listener;

public class Select2 extends Composite {

	private static final long serialVersionUID = 1L;
	private static final String RESOURCES_PATH = "resources/";
	private static final String REGISTER_PATH = "select2/";

	private static final String[] RESOURCE_FILES = { "jquery/jquery-1.9.1.min.js", "select2/select2.min.js",

	"handler.js", "select2/select2.css", "select2/select2-spinner.gif", "select2/select2.png", "select2/select2x2.png" };
	private static final String REMOTE_TYPE = "eiswind.Select2";

	
	private final RemoteObject remoteObject;

	
	private String[] selection;
	private boolean multi = false;
	
	private boolean allowClear;
	private String placeHolder;
	private List<Listener> selectionListeners = new ArrayList<>();

	
	private final OperationHandler operationHandler = new AbstractOperationHandler() {

		@Override
		public void handleNotify(String event, JsonObject properties) {
			JsonValue evtValue = properties.get("value");

			if (evtValue != null) {
				if (evtValue.isString()) {
					Select2.this.selection = new String[]{ evtValue.asString()};
				}
				else if( evtValue.isArray()){
					JsonArray array = evtValue.asArray();
					String [] sel = new String[array.size()];
					for(int i=0;i<array.size();i++){
						JsonValue value = array.get(i);
						sel[i] = value.asString();
					}
					Select2.this.selection = sel; 
					
				}
				Event e = new Event();
				e.type = SWT.Selection;
				e.data=Select2.this.selection;
				e.widget = Select2.this;
				for(Listener l: selectionListeners){
					l.handleEvent(e);
				}
			}
		}

	};
	
	public Select2(Composite parent,  int style) {
		super(parent, style);
		registerResources();
		loadJavaScript();
		Connection connection = RWT.getUISession().getConnection();
		remoteObject = connection.createRemoteObject(REMOTE_TYPE);
		remoteObject.setHandler(operationHandler);
		System.out.println(WidgetUtil.getId(this));
		remoteObject.set("parent", WidgetUtil.getId(this));
		if ((style & SWT.MULTI) > 0) {
			multi = true;

		}
		remoteObject.set("multi", multi);
		
		remoteObject.listen("selection", true);
	}

	private void registerResources() {
		ResourceManager resourceManager = RWT.getResourceManager();
		boolean isRegistered = resourceManager.isRegistered(REGISTER_PATH + RESOURCE_FILES[0]);
		if (!isRegistered) {
			try {
				for (String fileName : RESOURCE_FILES) {
					register(resourceManager, fileName);
				}
			} catch (IOException ioe) {
				throw new IllegalArgumentException("Failed to load resources", ioe);
			}
		}
	}

	private void loadJavaScript() {
		JavaScriptLoader jsLoader = RWT.getClient().getService(JavaScriptLoader.class);
		ResourceManager resourceManager = RWT.getResourceManager();

		jsLoader.require(resourceManager.getLocation(REGISTER_PATH + "jquery/jquery-1.9.1.min.js"));
		jsLoader.require(resourceManager.getLocation(REGISTER_PATH + "select2/select2.min.js"));
		jsLoader.require(resourceManager.getLocation(REGISTER_PATH + "handler.js"));

	}

	private void register(ResourceManager resourceManager, String fileName) throws IOException {
		ClassLoader classLoader = Select2.class.getClassLoader();
		InputStream inputStream = classLoader.getResourceAsStream(RESOURCES_PATH + fileName);
		try {
			resourceManager.register(REGISTER_PATH + fileName, inputStream);
		} finally {
			inputStream.close();
		}
	}

	// //////////////////
	// overwrite methods

	@Override
	public void setLayout(Layout layout) {
		throw new UnsupportedOperationException("Cannot change internal layout of Select2");
	}

	@Override
	public void dispose() {
		super.dispose();
	
		remoteObject.destroy();
		selectionListeners.clear();
		
	}

	// ////
	// API

	

	public void setData(List<Select2Item> data) {
		
		JsonArray results = new JsonArray();
		for (Select2Item item : data) {
			JsonObject it = new JsonObject();
			it.add("id", item.getId());
			it.add("text", item.getText());
			it.add("shortText", item.getShortText());
			it.add("locked", item.isLocked());
			results.add(it);
		}
		JsonObject datObj = new JsonObject();
		datObj.add("results", results);
		remoteObject.set("data", datObj);
	}

	public String[] getSelection() {
		if(selection ==null){
			selection = new String[]{};
		}
		return selection;
	}

	public void setSelection(String selection) {
		setSelection(new String[]{selection});
		
	}
	
	public void setSelection(String[] selection){
		this.selection =selection;
		JsonArray array = new JsonArray();
		for(String s :selection){
			array.add(s);
		}
		remoteObject.set("selection", array);
	}
	

	public boolean isMulti() {
		return multi;
		
	}

	public boolean isAllowClear() {
		return allowClear;
	}

	public void setAllowClear(boolean allowClear) {
		if(allowClear && placeHolder==null ){
			throw new IllegalStateException("Placeholder must be set for allowClear");
		}
		this.allowClear = allowClear;
		remoteObject.set("allowClear", allowClear);
	}

	public String getPlaceHolder() {
		return placeHolder;
	}

	public void setPlaceHolder(String placeHolder) {
		this.placeHolder = placeHolder;
		remoteObject.set("placeHolder", placeHolder);
	}

	@Override
	public void addListener(int type,Listener l){
		// TODO implement other events
		if( type == SWT.Selection){
			selectionListeners .add(l);
		} else {
			super.addListener(type, l);
		}
		
	}
	
	@Override
	public void removeListener(int type, Listener l){
		if(type == SWT.Selection){
			selectionListeners.remove(l);
		} else {
			super.removeListener(type, l);
		}
	}
	
	


}