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package org.eclipse.mylyn.internal.tasks.ui.notifications;
/*******************************************************************************
* Copyright (c) 2004, 2007 Mylyn project committers 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
*******************************************************************************/
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;
import org.eclipse.core.runtime.Assert;
import org.eclipse.mylyn.tasks.core.IRepositoryModel;
import org.eclipse.mylyn.tasks.core.ITaskComment;
import org.eclipse.mylyn.tasks.core.data.TaskAttribute;
import org.eclipse.mylyn.tasks.core.data.TaskData;
/**
* @author Steffen Pingel
*/
public class TaskDataDiff {
private static final int MAX_CHANGED_ATTRIBUTES = 2;
private final String[] ATTRIBUTES_IDS = new String[] { TaskAttribute.SUMMARY, TaskAttribute.DESCRIPTION,
TaskAttribute.PRODUCT, TaskAttribute.PRIORITY, TaskAttribute.USER_ASSIGNED, };
private final TaskData newTaskData;
private final TaskData oldTaskData;
private final Set<ITaskComment> newComments = new LinkedHashSet<ITaskComment>();
private final Set<TaskAttributeDiff> changedAttributes = new LinkedHashSet<TaskAttributeDiff>();
private final IRepositoryModel repositoryModel;
public TaskDataDiff(IRepositoryModel repositoryModel, TaskData newTaskData, TaskData oldTaskData) {
Assert.isNotNull(repositoryModel);
Assert.isNotNull(newTaskData);
this.repositoryModel = repositoryModel;
this.newTaskData = newTaskData;
this.oldTaskData = oldTaskData;
parse();
}
public Collection<ITaskComment> getNewComments() {
return newComments;
}
public Collection<TaskAttributeDiff> getChangedAttributes() {
return changedAttributes;
}
private void parse() {
for (String attributeId : ATTRIBUTES_IDS) {
TaskAttribute newAttribute = newTaskData.getRoot().getMappedAttribute(attributeId);
TaskAttribute oldAttribute = null;
if (oldTaskData != null) {
oldAttribute = oldTaskData.getRoot().getMappedAttribute(attributeId);
}
addChangedAttribute(oldAttribute, newAttribute);
}
// other attributes that have changed on newTaskData
for (TaskAttribute newAttribute : newTaskData.getRoot().getAttributes().values()) {
TaskAttribute oldAttribute = null;
if (oldTaskData != null) {
oldAttribute = oldTaskData.getRoot().getMappedAttribute(newAttribute.getPath());
}
addChangedAttribute(oldAttribute, newAttribute);
}
// other attributes that have been removed from newTaskData
if (oldTaskData != null) {
for (TaskAttribute oldAttribute : oldTaskData.getRoot().getAttributes().values()) {
TaskAttribute newAttribute = newTaskData.getRoot().getMappedAttribute(oldAttribute.getPath());
if (newAttribute == null) {
addChangedAttribute(oldAttribute, newAttribute);
}
}
}
}
private void addChangedAttribute(TaskAttribute oldAttribute, TaskAttribute newAttribute) {
TaskAttribute attribute;
if (newAttribute != null) {
attribute = newAttribute;
} else {
attribute = oldAttribute;
}
String type = attribute.getMetaData().getType();
if (TaskAttribute.TYPE_COMMENT.equals(type)) {
addChangedComment(oldAttribute, newAttribute);
} else if (TaskAttribute.TYPE_OPERATION.equals(type)) {
// ignore
} else if (attribute.getMetaData().getKind() != null) {
TaskAttributeDiff diff = new TaskAttributeDiff(oldAttribute, newAttribute);
if (diff.hasChanges()) {
changedAttributes.add(diff);
}
}
}
private void addChangedComment(TaskAttribute oldAttribute, TaskAttribute newAttribute) {
if (oldAttribute == null) {
newComments.add(repositoryModel.createTaskComment(newAttribute));
}
}
@Override
public String toString() {
return toString(60);
}
// TODO implement trim based on text width
public String toString(int maxWidth) {
StringBuilder sb = new StringBuilder();
String sep = "";
// append first comment
int newCommentCount = newComments.size();
if (newCommentCount > 0) {
ITaskComment comment = newComments.iterator().next();
sb.append(TaskDiffUtil.trim(TaskDiffUtil.commentToString(comment), 60));
if (newCommentCount > 1) {
sb.append(" (" + (newCommentCount - 1) + " more)");
}
sep = "\n";
}
// append changed attributes
int n = 0;
for (TaskAttributeDiff attributeDiff : changedAttributes) {
String label = attributeDiff.getLabel();
if (label != null) {
sb.append(sep);
sb.append(" ");
sb.append(label);
sb.append(" ");
sb.append(TaskDiffUtil.trim(TaskDiffUtil.listToString(attributeDiff.getRemovedValues()), 28));
sb.append(" -> ");
sb.append(TaskDiffUtil.trim(TaskDiffUtil.listToString(attributeDiff.getAddedValues()), 28));
if (++n == MAX_CHANGED_ATTRIBUTES) {
break;
}
}
}
return sb.toString();
}
}
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