1 files changed, 133 insertions, 0 deletions
diff --git a/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/data/TaskAttributeDiff.java b/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/data/TaskAttributeDiff.java
new file mode 100644
index 000000000..ff75814dc
--- /dev/null
+++ b/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/data/TaskAttributeDiff.java
@@ -0,0 +1,133 @@
+/*******************************************************************************
+ * Copyright (c) 2004, 2008 Tasktop Technologies 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:
+ *     Tasktop Technologies - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.mylyn.internal.tasks.core.data;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import org.eclipse.core.runtime.Assert;
+import org.eclipse.mylyn.tasks.core.data.ITaskAttributeDiff;
+import org.eclipse.mylyn.tasks.core.data.TaskAttribute;
+
+/**
+ * @author Steffen Pingel
+ */
+public class TaskAttributeDiff implements ITaskAttributeDiff {
+
+	private String attributeId;
+
+	private final TaskAttribute newAttribute;
+
+	private final List<String> newValues;
+
+	private final TaskAttribute oldAttribute;
+
+	private final List<String> oldValues;
+
+	public TaskAttributeDiff(TaskAttribute oldAttribute, TaskAttribute newAttribute) {
+		Assert.isTrue(oldAttribute != null || newAttribute != null);
+		this.oldAttribute = oldAttribute;
+		this.newAttribute = newAttribute;
+		if (oldAttribute != null) {
+			this.oldValues = oldAttribute.getTaskData().getAttributeMapper().getValueLabels(oldAttribute);
+			this.attributeId = oldAttribute.getId();
+		} else {
+			this.oldValues = Collections.emptyList();
+		}
+		if (newAttribute != null) {
+			this.newValues = newAttribute.getTaskData().getAttributeMapper().getValueLabels(newAttribute);
+			this.attributeId = newAttribute.getId();
+		} else {
+			this.newValues = Collections.emptyList();
+		}
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj == null) {
+			return false;
+		}
+		if (getClass() != obj.getClass()) {
+			return false;
+		}
+		TaskAttributeDiff other = (TaskAttributeDiff) obj;
+		if (attributeId == null) {
+			if (other.attributeId != null) {
+				return false;
+			}
+		} else if (!attributeId.equals(other.attributeId)) {
+			return false;
+		}
+		return true;
+	}
+
+	public List<String> getAddedValues() {
+		List<String> result = new ArrayList<String>(getNewValues());
+		if (getOldValues() != null) {
+			result.removeAll(getOldValues());
+		}
+		return result;
+	}
+
+	public TaskAttribute getNewAttribute() {
+		return newAttribute;
+	}
+
+	public List<String> getNewValues() {
+		return newValues;
+	}
+
+	public TaskAttribute getOldAttribute() {
+		return oldAttribute;
+	}
+
+	public List<String> getOldValues() {
+		return oldValues;
+	}
+
+	public List<String> getRemovedValues() {
+		List<String> result = new ArrayList<String>(getOldValues());
+		if (getNewValues() != null) {
+			result.removeAll(getNewValues());
+		}
+		return result;
+	}
+
+	public boolean hasChanges() {
+		return !oldValues.equals(newValues);
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((attributeId == null) ? 0 : attributeId.hashCode());
+		return result;
+	}
+
+	public String getLabel() {
+		if (newAttribute != null) {
+			return newAttribute.getTaskData().getAttributeMapper().getLabel(newAttribute);
+		} else {
+			return oldAttribute.getTaskData().getAttributeMapper().getLabel(oldAttribute);
+		}
+	}
+
+	public String getAttributeId() {
+		return attributeId;
+	}
+
+}
+\ No newline at end of file