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/*******************************************************************************
* Copyright (c) 2004, 2009 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.ui.notifications;
import java.text.MessageFormat;
import java.util.Iterator;
import java.util.List;
import org.eclipse.mylyn.internal.tasks.core.data.TaskAttributeDiff;
import org.eclipse.mylyn.internal.tasks.core.data.TaskDataDiff;
import org.eclipse.mylyn.tasks.core.IRepositoryPerson;
import org.eclipse.mylyn.tasks.core.ITaskComment;
import org.eclipse.mylyn.tasks.core.data.ITaskAttributeDiff;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Drawable;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Composite;
/**
* @author Steffen Pingel
*/
public class TaskDiffUtil {
private static final int MAX_CHANGED_ATTRIBUTES = 2;
// could use the ellipsis glyph on some platforms "\u2026"
private static final String ELLIPSIS = "..."; //$NON-NLS-1$
private static int DRAW_FLAGS = SWT.DRAW_MNEMONIC | SWT.DRAW_TAB | SWT.DRAW_TRANSPARENT | SWT.DRAW_DELIMITER;
public static String toString(TaskDataDiff diff) {
return toString(diff, 60, true);
}
// TODO implement trim based on text width
public static String toString(TaskDataDiff diff, int maxWidth, boolean includeNewest) {
StringBuilder sb = new StringBuilder();
String sep = ""; //$NON-NLS-1$
// append first comment
int newCommentCount = diff.getNewComments().size();
if (newCommentCount > 0) {
Iterator<ITaskComment> iter = diff.getNewComments().iterator();
ITaskComment comment = iter.next();
if (includeNewest) {
while (iter.hasNext()) {
comment = iter.next();
}
}
sb.append(TaskDiffUtil.trim(TaskDiffUtil.commentToString(comment), 60));
if (newCommentCount > 1) {
sb.append(" (" + (newCommentCount - 1) + Messages.TaskDataDiff_more_); //$NON-NLS-1$
}
sep = "\n"; //$NON-NLS-1$
}
// append changed attributes
int n = 0;
for (ITaskAttributeDiff changedAttribute : diff.getChangedAttributes()) {
TaskAttributeDiff attributeDiff = (TaskAttributeDiff) changedAttribute;
String label = attributeDiff.getLabel();
if (label != null) {
sb.append(sep);
sb.append(" "); //$NON-NLS-1$
sb.append(label);
sb.append(" "); //$NON-NLS-1$
sb.append(TaskDiffUtil.trim(TaskDiffUtil.listToString(attributeDiff.getRemovedValues()), 28));
sb.append(" -> "); //$NON-NLS-1$
sb.append(TaskDiffUtil.trim(TaskDiffUtil.listToString(attributeDiff.getAddedValues()), 28));
if (++n == MAX_CHANGED_ATTRIBUTES) {
break;
}
sep = "\n"; //$NON-NLS-1$
}
}
return sb.toString();
}
public static String commentToString(ITaskComment comment) {
StringBuilder sb = new StringBuilder();
sb.append(MessageFormat.format(Messages.TaskDiffUtil_Comment_by_X, personToString(comment.getAuthor())));
sb.append(": "); //$NON-NLS-1$
sb.append(cleanCommentText(comment.getText()));
return sb.toString();
}
private static String personToString(IRepositoryPerson author) {
if (author == null) {
return Messages.TaskDiffUtil_Unknown;
} else if (author.getName() != null) {
return author.getName();
}
return author.getPersonId();
}
public static String cleanCommentText(String value) {
String text = ""; //$NON-NLS-1$
String[] lines = value.split("\n"); //$NON-NLS-1$
boolean attachment = false;
boolean needSeparator = false;
for (String line : lines) {
// skip comments and info lines
if (attachment) {
text += Messages.TaskDiffUtil_attachment + line;
needSeparator = true;
attachment = false;
} else if (line.startsWith(">") // //$NON-NLS-1$
|| line.matches("^\\s*\\(In reply to comment.*")) { //$NON-NLS-1$
needSeparator = true;
continue;
} else if (line.startsWith("Created an attachment (id=")) { //$NON-NLS-1$
attachment = true;
} else {
if (needSeparator) {
if (!text.matches(".*\\p{Punct}\\s*")) { //$NON-NLS-1$
text = text.trim();
if (text.length() > 0) {
text += "."; //$NON-NLS-1$
}
}
}
text += " " + line; //$NON-NLS-1$
attachment = false;
needSeparator = false;
}
}
return foldSpaces(text);
}
public static String listToString(List<String> values) {
if (values == null) {
return ""; //$NON-NLS-1$
}
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String value : values) {
if (!first) {
sb.append(", "); //$NON-NLS-1$
} else {
first = false;
}
sb.append(foldSpaces(value));
}
return sb.toString();
}
public static String foldSpaces(String value) {
return value.replaceAll("\\s+", " ").trim(); //$NON-NLS-1$ //$NON-NLS-2$
}
public static String trim(String value, int length) {
if (value.length() > length) {
value = value.substring(0, length - 3) + "..."; //$NON-NLS-1$
}
return value;
}
/**
* Note: Copied from CLabel. Shorten the given text <code>t</code> so that its length doesn't exceed the given
* width. The default implementation replaces characters in the center of the original string with an ellipsis
* ("..."). Override if you need a different strategy.
*
* @param gc
* the gc to use for text measurement
* @param t
* the text to shorten
* @param width
* the width to shorten the text to, in pixels
* @return the shortened text
*/
public static final String shortenText2(Composite composite, String t, int width) {
GC gc = new GC(composite);
if (t == null) {
return null;
}
int w = gc.textExtent(ELLIPSIS, DRAW_FLAGS).x;
if (width <= w) {
return t;
}
int l = t.length();
int max = l / 2;
int min = 0;
int mid = (max + min) / 2 - 1;
if (mid <= 0) {
return t;
}
while (min < mid && mid < max) {
String s1 = t.substring(0, mid);
String s2 = t.substring(l - mid, l);
int l1 = gc.textExtent(s1, DRAW_FLAGS).x;
int l2 = gc.textExtent(s2, DRAW_FLAGS).x;
if (l1 + w + l2 > width) {
max = mid;
mid = (max + min) / 2;
} else if (l1 + w + l2 < width) {
min = mid;
mid = (max + min) / 2;
} else {
min = max;
}
}
gc.dispose();
if (mid == 0) {
return t;
}
return t.substring(0, mid) + ELLIPSIS + t.substring(l - mid, l);
}
// From PerspectiveBarContributionItem
public static String shortenText(Drawable composite, String text, int maxWidth) {
String returnText = text;
GC gc = new GC(composite);
if (gc.textExtent(text).x > maxWidth) {
for (int i = text.length(); i > 0; i--) {
String subString = text.substring(0, i);
subString = subString + "..."; //$NON-NLS-1$
if (gc.textExtent(subString).x < maxWidth) {
returnText = subString;
break;
}
}
}
gc.dispose();
return returnText;
}
}
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