| /* |
| * Copyright (c) 2011, 2012 Eike Stepper (Berlin, Germany) 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: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.net4j.util.ui; |
| |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| /** |
| * @author Eike Stepper |
| * @since 3.1 |
| */ |
| public interface ValidationContext |
| { |
| public void setValidationError(Object source, String message); |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public static class Aggregator implements ValidationContext |
| { |
| private ValidationContext delegate; |
| |
| private Map<Object, String> messages = new WeakHashMap<Object, String>(); |
| |
| public Aggregator(ValidationContext delegate) |
| { |
| this.delegate = delegate; |
| } |
| |
| public void setValidationError(Object source, String message) |
| { |
| if (message != null) |
| { |
| messages.put(source, message); |
| } |
| else |
| { |
| messages.remove(source); |
| } |
| |
| if (delegate != null) |
| { |
| delegate.setValidationError(this, messages.isEmpty() ? null : formatMessage(messages)); |
| } |
| } |
| |
| protected String formatMessage(Map<Object, String> messages) |
| { |
| if (messages.size() == 1) |
| { |
| return messages.values().iterator().next(); |
| } |
| |
| StringBuilder builder = new StringBuilder(); |
| for (String message : messages.values()) |
| { |
| if (builder.length() != 0) |
| { |
| builder.append("\n"); |
| } |
| |
| builder.append("- " + message); |
| } |
| |
| return builder.toString(); |
| } |
| } |
| } |