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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.ccvs.core;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import org.eclipse.core.runtime.IStatus;
/**
* A tag in CVS gives a label to a collection of revisions. The labels can represent a version, a branch,
* or a date.
*/
public class CVSTag {
public final static int HEAD = 0;
public final static int BRANCH = 1;
public final static int VERSION = 2;
public final static int DATE = 3;
public static final CVSTag DEFAULT = new CVSTag();
public static final CVSTag BASE = new CVSTag("BASE", VERSION); //$NON-NLS-1$
protected String name;
protected int type;
private static final String DATE_TAG_NAME_FORMAT = "dd MMM yyyy HH:mm:ss Z";//$NON-NLS-1$
private static final SimpleDateFormat tagNameFormat = new SimpleDateFormat(DATE_TAG_NAME_FORMAT, Locale.US);
protected static synchronized String dateToTagName(Date date){
tagNameFormat.setTimeZone(TimeZone.getTimeZone("GMT"));//$NON-NLS-1$
return tagNameFormat.format(date); //$NON-NLS-1$
}
protected static Date tagNameToDate(String name){
if (name == null) return null;
try {
return tagNameFormat.parse(name);
} catch (ParseException e) {
CVSProviderPlugin.log(new CVSException("Tag name " + name + " is not of the expected format " + DATE_TAG_NAME_FORMAT, e)); //$NON-NLS-1$ //$NON-NLS-2$
return null;
}
}
public CVSTag() {
this("HEAD", HEAD); //$NON-NLS-1$
}
public CVSTag(String name, int type) {
this.name = name;
this.type = type;
}
//Write a date in local date tag format
public CVSTag(Date date) {
this(dateToTagName(date), DATE);
}
public boolean equals(Object other) {
if(other == this) return true;
if (!(other instanceof CVSTag)) return false;
CVSTag tag = ((CVSTag)other);
if (getType() != tag.getType()) return false;
if (!getName().equals(tag.getName())) return false;
return true;
}
public String getName() {
return name;
}
public int getType() {
// TODO: getType() will not return accurate types for Tags retrieved from the local CVS Entries file. See Bug: 36758
return type;
}
public int hashCode() {
return name.hashCode();
}
public int compareTo(CVSTag other) {
if(getType() == DATE && other.getType()== DATE){
Date date1 = asDate();
Date date2 = other.asDate();
if(date1 == null || date2 == null)return -1;
return date1.compareTo(date2);
}
return getName().compareTo(other.getName());
}
public static boolean equalTags(CVSTag tag1, CVSTag tag2) {
if (tag1 == null) tag1 = CVSTag.DEFAULT;
if (tag2 == null) tag2 = CVSTag.DEFAULT;
return tag1.equals(tag2);
}
public static IStatus validateTagName(String tagName) {
if (tagName == null)
return new CVSStatus(CVSStatus.ERROR, Policy.bind("CVSTag.nullName")); //$NON-NLS-1$
if (tagName.equals("")) //$NON-NLS-1$
return new CVSStatus(CVSStatus.ERROR, Policy.bind("CVSTag.emptyName")); //$NON-NLS-1$
if (!Character. isLetter(tagName.charAt(0)))
return new CVSStatus(CVSStatus.ERROR, Policy.bind("CVSTag.beginName")); //$NON-NLS-1$
for (int i = 0; i < tagName.length(); i++) {
char c = tagName.charAt(i);
if ( Character.isSpaceChar(c) || c == '$' || c == ',' || c == '.' || c == ':' || c == ';' || c == '@' || c == '|')
return new CVSStatus(CVSStatus.ERROR, Policy.bind("CVSTag.badCharName")); //$NON-NLS-1$
}
return new CVSStatus(CVSStatus.OK, Policy.bind("ok")); //$NON-NLS-1$
}
/**
* Return the date this tag represents or <code>null</code>
* if the tag is not of type DATE.
* @return the date of the tag or <code>null</code>
*/
public Date asDate(){
return tagNameToDate(name);
}
}
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