FailureHandler.java

/*******************************************************************************
 * Copyright (c) 2011, 2016 Eurotech and/or its affiliates
 *
 * 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:
 *     Eurotech
 *******************************************************************************/
package org.eclipse.kura.web.client.util;

import java.util.List;

import org.eclipse.kura.web.client.messages.Messages;
import org.eclipse.kura.web.client.messages.ValidationMessages;
import org.eclipse.kura.web.shared.GwtKuraErrorCode;
import org.eclipse.kura.web.shared.GwtKuraException;

import com.extjs.gxt.ui.client.widget.Info;
import com.extjs.gxt.ui.client.widget.form.Field;
import com.extjs.gxt.ui.client.widget.form.FormPanel;
import com.extjs.gxt.ui.client.widget.form.TextArea;
import com.extjs.gxt.ui.client.widget.form.TextField;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.StatusCodeException;

/**
 * Handles GwtExceptions from RCP calls. 
 *  
 * @author mcarrer
 *
 */
public class FailureHandler 
{
	private static final Messages          CMSGS = GWT.create(Messages.class);
	private static final ValidationMessages MSGS = GWT.create(ValidationMessages.class);

	public static void handle(Throwable caught) {
		if (caught instanceof GwtKuraException) {

			GwtKuraException  gee = (GwtKuraException) caught;   
			GwtKuraErrorCode code = gee.getCode();
			switch (code) {
			
			default:
				Info.display(CMSGS.error(), caught.getLocalizedMessage());
				break;
			}
		}
		else if (caught instanceof StatusCodeException && 
		         ((StatusCodeException) caught).getStatusCode() == 0) {

	        // the current operation was interrupted as the user started a new one 
	        // or navigated away from the page.
	        // we can ignore this error and do nothing.
		}
		else {

			Info.display(CMSGS.error(), caught.getLocalizedMessage());
			caught.printStackTrace();			
		}
	}


	@SuppressWarnings("unchecked")
	public static boolean handleFormException(FormPanel form, Throwable caught) {
		
		boolean isWarning = false;
		if (caught instanceof GwtKuraException) {

			List<Field<?>> fields = form.getFields();
			GwtKuraException   gee = (GwtKuraException) caught;   
			GwtKuraErrorCode  code = gee.getCode();
			switch (code) {
			
			case DUPLICATE_NAME:
			    boolean fieldFound = false;
				String duplicateFieldName = gee.getArguments()[0];
				for (Field<?> field : fields) {
					if (duplicateFieldName.equals(field.getName())) {
						TextField<String>  textField = (TextField<String>) field;
						textField.markInvalid(MSGS.duplicateValue());
						fieldFound = true;
						break;
					}
				}
				if (!fieldFound) {
				    Info.display(CMSGS.error(), caught.getLocalizedMessage());
				}
				break;

			case ILLEGAL_NULL_ARGUMENT:
				String invalidFieldName = gee.getArguments()[0];
				for (Field<?> field : fields) {
					if (invalidFieldName.equals(field.getName())) {
						TextField<String>  textField = (TextField<String>) field;
						textField.markInvalid(MSGS.invalidNullValue());
						break;
					}
				}
				break;

			case ILLEGAL_ARGUMENT:
				String invalidFieldName1 = gee.getArguments()[0];
				for (Field<?> field : fields) {
					if (invalidFieldName1.equals(field.getName())) {
						TextField<String>  textField = (TextField<String>) field;
						textField.markInvalid(gee.getCause().getMessage());
						break;
					}
				}
				break;

			case INVALID_RULE_QUERY:
				for (Field<?> field : fields) {
					if ("query".equals(field.getName())) {
						TextArea statement = (TextArea) field;
						statement.markInvalid(caught.getLocalizedMessage());
						break;
					}
				}
				break;

			case WARNING:
				isWarning = true;
				Info.display(CMSGS.warning(), caught.getLocalizedMessage());
				break;

			default:
				Info.display(CMSGS.error(), caught.getLocalizedMessage());
				caught.printStackTrace();
				break;
			}
		}
		else {

			Info.display(CMSGS.error(), caught.getLocalizedMessage());
			caught.printStackTrace();			
		}
		
		return isWarning;
	}
}