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package org.eclipse.webdav.client;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Vector;
import org.eclipse.webdav.internal.kernel.utils.Assert;
/**
* A utility for manipulating URLs.
*
* Note: This class/interface is part of an interim API that is still under
* development and expected to change significantly before reaching stability.
* It is being made available at this early stage to solicit feedback from pioneering
* adopters on the understanding that any code that uses this API will almost
* certainly be broken (repeatedly) as the API evolves.
*
*/
public class URLTool {
/**
* Returns the given URL with a trailing slash appended to it. If the URL
* already has a trailing slash the URL is returned unchanged.
*
*
Example
*
*
Given URL
*
Returned URL
*
*
"http://hostname/folder"
*
"http://hostname/folder/"
*
*
"http://hostname/folder/
*
"http://hostname/folder/"
*
*
* @param url a URL
* @return the given URL with a trailing slash
* @throws MalformedURLException if the given URL is malformed
*/
public static URL appendTrailingSlash(String url) throws MalformedURLException {
return appendTrailingSlash(new URL(url));
}
/**
* Returns the given URL with a trailing slash appended to
* it. If the URL already has a trailing slash the
* URL is returned unchanged.
*
*
Example
*
*
Given URL
*
Returned URL
*
*
"http://hostname/folder"
*
"http://hostname/folder/"
*
*
"http://hostname/folder/
*
"http://hostname/folder/"
*
*
* @param url a URL
* @return the given URL with a trailing slash
*/
public static URL appendTrailingSlash(URL url) {
String file = url.getFile();
if (file.endsWith("/")) { //$NON-NLS-1$
return url;
}
try {
return new URL(url.getProtocol(), url.getHost(), url.getPort(), file + "/"); //$NON-NLS-1$
} catch (MalformedURLException e) {
Assert.isTrue(false, Policy.bind("assert.internalError")); //$NON-NLS-1$
}
return null;
}
/**
* Returns the child URL formed by joining the given member with the
* given parent URL.
*
* @return a child URL of the given parent
* @throws MalformedURLException if the given parent is malformed
*/
public static URL getChild(String parent, String member) throws MalformedURLException {
return getChild(new URL(parent), member);
}
/**
* Returns the child URL formed by joining the given member with the
* given parent URL.
*
* @return a child URL of the given parent
*/
public static URL getChild(URL parent, String member) {
String file = parent.getFile();
if (!file.endsWith("/")) //$NON-NLS-1$
file = file + "/"; //$NON-NLS-1$
try {
return new URL(parent.getProtocol(), parent.getHost(), parent.getPort(), file + member);
} catch (MalformedURLException e) {
Assert.isTrue(false, Policy.bind("assert.internalError")); //$NON-NLS-1$
}
return null;
}
/**
* Returns all elements in the given URLs path.
*
*
Example
*
*
Given URL
*
Element
*
*
"http://hostname/"
*
[]
*
*
"http://hostname/folder/
*
[folder]
*
*
"http://hostname/folder/file
*
[folder, file]
*
* @param url a URL
* @return all elements in the given URLs path
* @throws MalformedURLException if the given URL is malformed
*/
public static Vector getElements(String url) throws MalformedURLException {
return getElements(new URL(url));
}
/**
* Returns all elements in the given URLs path.
*
*
Example
*
*
Given URL
*
Element
*
*
"http://hostname/"
*
[]
*
*
"http://hostname/folder/
*
[folder]
*
*
"http://hostname/folder/file
*
[folder, file]
*
* @param url a URL
* @return all elements in the given URLs path
*/
public static Vector getElements(URL url) {
Vector result = new Vector(5);
String lastElement = null;
while ((lastElement = getLastElement(url)) != null) {
result.insertElementAt(lastElement, 0);
url = getParent(url);
}
return result;
}
/**
* Returns the last element in the given URLs path, or null
* if the URL is the root.
*
*
Example
*
*
Given URL
*
Last Element
*
*
"http://hostname/"
*
null
*
*
"http://hostname/folder/
*
folder
*
*
"http://hostname/folder/file
*
file
*
* @param url a URL
* @return the last element in the given URLs path, or
* null if the URL is the root
* @throws MalformedURLException if the given URL is malformed
*/
public static String getLastElement(String url) throws MalformedURLException {
return getLastElement(new URL(url));
}
/**
* Returns the last element in the given URLs path, or null
* if the URL is the root.
*
*
Example
*
*
Given URL
*
Last Element
*
*
"http://hostname/"
*
null
*
*
"http://hostname/folder/
*
folder
*
*
"http://hostname/folder/file
*
file
*
* @param url a URL
* @return the last element in the given URLs path, or
* null if the URL is the root
*/
public static String getLastElement(URL url) {
String file = url.getFile();
int len = file.length();
if (len == 0 || len == 1 && file.charAt(0) == '/') {
return null;
}
int lastSlashIndex = -1;
for (int i = len - 2; lastSlashIndex == -1 && i >= 0; --i) {
if (file.charAt(i) == '/') {
lastSlashIndex = i;
}
}
boolean isDirectory = file.charAt(len - 1) == '/';
if (lastSlashIndex == -1) {
if (isDirectory)
return file.substring(0, len - 1);
return file;
}
if (isDirectory)
return file.substring(lastSlashIndex + 1, len - 1);
return file.substring(lastSlashIndex + 1, len);
}
/**
* Returns the parent URL of the given URL, or null if the
* given URL is the root.
*
*
Example
*
*
Given URL
*
Parent URL
*
*
"http://hostname/"
*
null
*
*
"http://hostname/folder/file
*
"http://hostname/folder/
*
*
* @param url a URL
* @return the parent of the given URL
* @throws MalformedURLException if the given URL is malformed
*/
public static URL getParent(String url) throws MalformedURLException {
return getParent(new URL(url));
}
/**
* Returns the parent URL of the given URL, or null if the
* given URL is the root.
*
*
Example
*
*
Given URL
*
Parent URL
*
*
"http://hostname/"
*
null
*
*
"http://hostname/folder/file
*
"http://hostname/folder/
*
*
* @param url a URL
* @return the parent of the given URL
*/
public static URL getParent(URL url) {
String file = url.getFile();
int len = file.length();
if (len == 0 || len == 1 && file.charAt(0) == '/')
return null;
int lastSlashIndex = -1;
for (int i = len - 2; lastSlashIndex == -1 && i >= 0; --i) {
if (file.charAt(i) == '/')
lastSlashIndex = i;
}
if (lastSlashIndex == -1)
file = ""; //$NON-NLS-1$
else
file = file.substring(0, lastSlashIndex + 1);
try {
url = new URL(url.getProtocol(), url.getHost(), url.getPort(), file);
} catch (MalformedURLException e) {
Assert.isTrue(false, e.getMessage());
}
return url;
}
/**
* Returns the root URL of the given URL.
*
*
Example
*
*
Given URL
*
Root URL
*
*
"http://hostname/"
*
"http://hostname/"
*
*
"http://hostname/folder/file
*
"http://hostname/"
*
*
* @param urlString a URL
* @return the root url of the given URL
* @throws MalformedURLException if the given URL is malformed
*/
public static URL getRoot(String urlString) throws MalformedURLException {
return getRoot(new URL(urlString));
}
/**
* Returns the root URL of the given URL.
*
*
Example
*
*
Given URL
*
Root URL
*
*
"http://hostname/"
*
"http://hostname/"
*
*
"http://hostname/folder/file
*
"http://hostname/"
*
*
* @param url a URL
* @return the root URL of the given URL
*/
public static URL getRoot(URL url) {
try {
return new URL(url.getProtocol(), url.getHost(), url.getPort(), "/"); //$NON-NLS-1$
} catch (MalformedURLException e) {
Assert.isTrue(false, Policy.bind("assert.internalError")); //$NON-NLS-1$
}
return null;
}
/**
* Returns the given URL with its trailing slash removed. If the URL has
* no trailing slash, the URL is returned unchanged.
*
*
Example
*
*
Given URL
*
Returned URL
*
*
"http://hostname/folder"
*
"http://hostname/folder"
*
*
"http://hostname/folder/
*
"http://hostname/folder"
*
*
* @param url a URL
* @return the given URL with its last slash removed
* @throws MalformedURLException if the given URL is malformed
*/
public static URL removeTrailingSlash(String url) throws MalformedURLException {
return removeTrailingSlash(new URL(url));
}
/**
* Returns the given URL with its trailing slash removed. If the URL has
* no trailing slash, the URL is returned unchanged.
*
*
Example
*
*
Given URL
*
Returned URL
*
*
"http://hostname/folder"
*
"http://hostname/folder"
*
*
"http://hostname/folder/
*
"http://hostname/folder"
*
*
* @param url a URL
* @return the given URL with its last slash removed
*/
public static URL removeTrailingSlash(URL url) {
String file = url.getFile();
if (file.endsWith("/")) { //$NON-NLS-1$
file = file.substring(0, file.length() - 1);
try {
return new URL(url.getProtocol(), url.getHost(), url.getPort(), file);
} catch (MalformedURLException e) {
Assert.isTrue(false, e.getMessage());
}
} else {
return url;
}
return null;
}
/**
* Returns a boolean indicating whether the given URLs overlap.
*
*
Example
*
*
First URL
*
Second URL
*
Do they overlap
*
*
"http://hostname/folder/"
*
"http://hostname/folder/"
*
true
*
*
"http://hostname/folder/"
*
"http://hostname/folder/file"
*
true
*
*
"http://hostname/folder/file"
*
"http://hostname/folder/"
*
true
*
*
"http://hostname/folder1/"
*
"http://hostname/folder2/"
*
false
*
* @param url1 firt URL
* @param url2 second URL
* @return a boolean indicating whether the given URLs overlap
*/
public static boolean urlsOverlap(String url1, String url2) throws MalformedURLException {
return urlsOverlap(new URL(url1), new URL(url2));
}
/**
* Returns a boolean indicating whether the given URLs overlap.
*
*
Example
*
*
First URL
*
Second URL
*
Do they overlap
*
*
"http://hostname/folder/"
*
"http://hostname/folder/"
*
true
*
*
"http://hostname/folder/"
*
"http://hostname/folder/file"
*
true
*
*
"http://hostname/folder/file"
*
"http://hostname/folder/"
*
true
*
*
"http://hostname/folder1/"
*
"http://hostname/folder2/"
*
false
*
*
"http://hostname1/folder/"
*
"http://hostname2/folder/"
*
false
*
* @param url1 firt URL
* @param url2 second URL
* @return a boolean indicating whether the given URLs overlap
*/
public static boolean urlsOverlap(URL url1, URL url2) {
if (!getRoot(url1).equals(getRoot(url2))) {
return false;
}
Vector elements1 = URLTool.getElements(url1);
Vector elements2 = URLTool.getElements(url2);
for (int i = 0; i < elements1.size() && i < elements2.size(); ++i) {
String element1 = (String) elements1.elementAt(i);
String element2 = (String) elements2.elementAt(i);
if (!element1.equals(element2)) {
return false;
}
}
return true;
}
}
