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Common Base for Implementations of the ShrinkWrap Project
/*
* JBoss, Home of Professional Open Source
* Copyright 2009, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.shrinkwrap.impl.base.path;
import org.jboss.shrinkwrap.api.ArchivePath;
/**
* PathUtil
*
* A series of internal-only path utilities for adjusting relative forms, removing double-slashes, etc. Used in
* correcting inputs in the creation of new Paths
*
* @author Aslak Knutsen
* @author ALR
*/
public final class PathUtil {
// -------------------------------------------------------------------------------------||
// Class Members -----------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Empty String
*/
public static final String EMPTY = "";
// -------------------------------------------------------------------------------------||
// Constructor -------------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* No instantiation
*/
private PathUtil() {
throw new UnsupportedOperationException("Constructor should never be invoked; this is a static util class");
}
// -------------------------------------------------------------------------------------||
// Utilities ---------------------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Composes an absolute context from a given base and actual context relative to the base, returning the result. ie.
* base of "base" and context of "context" will result in form "/base/context".
*/
public static String composeAbsoluteContext(final String base, final String context) {
// Precondition checks
assertSpecified(base);
assertSpecified(context);
// Compose
final String relative = PathUtil.adjustToAbsoluteDirectoryContext(base);
final String reformedContext = PathUtil.optionallyRemovePrecedingSlash(context);
final String actual = relative + reformedContext;
// Return
return actual;
}
/**
* Adjusts the specified path to relative form:
*
* 1) Removes, if present, a preceding slash 2) Adds, if not present, a trailing slash
*
* Null arguments are returned as-is
*
* @param path
*/
public static String adjustToRelativeDirectoryContext(final String path) {
// Return nulls
if (path == null) {
return path;
}
// Strip absolute form
final String removedPrefix = optionallyRemovePrecedingSlash(path);
// Add end of context slash
final String addedPostfix = optionallyAppendSlash(removedPrefix);
// Return
return addedPostfix;
}
/**
* Adjusts the specified path to absolute form:
*
* 1) Adds, if not present, a preceding slash 2) Adds, if not present, a trailing slash
*
* Null arguments are returned as-is
*
* @param path
*/
public static String adjustToAbsoluteDirectoryContext(String path) {
// Return nulls
if (path == null) {
return path;
}
// Add prefic slash
final String prefixedPath = optionallyPrependSlash(path);
// Add end of context slash
final String addedPostfix = optionallyAppendSlash(prefixedPath);
// Return
return addedPostfix;
}
/**
* Removes, if present, the absolute slash preceding the specified path, and returns the adjusted result.
*
* @param path
* @return
*/
public static String optionallyRemovePrecedingSlash(final String path) {
// Precondition check
assertSpecified(path);
// Is there's a first character of slash
if (isFirstCharSlash(path)) {
// Return everything but first char
return path.substring(1);
}
// Return as-is
return path;
}
/**
* Removes, if present, the absolute slash following the specified path, and returns the adjusted result.
*
* @param path
* @return
*/
public static String optionallyRemoveFollowingSlash(final String path) {
// Precondition check
assertSpecified(path);
// Is there's a last character of slash
if (isLastCharSlash(path)) {
// Return everything but last char
return path.substring(0, path.length() - 1);
}
// Return as-is
return path;
}
/**
* Adds, if not already present, the absolute slash following the specified path, and returns the adjusted result.
*
* @param path
* @return
*/
public static String optionallyAppendSlash(final String path) {
// Precondition check
assertSpecified(path);
// If the last character is not a slash
if (!isLastCharSlash(path)) {
// Append
return path + ArchivePath.SEPARATOR;
}
// Return as-is
return path;
}
/**
* Adds, if not already present, the absolute slash preceding the specified path, and returns the adjusted result.
* If the argument is null, adjusts to an empty String before processing.
*
* @param path
* @return
*/
public static String optionallyPrependSlash(final String path) {
// Adjust null
String resolved = path;
if (resolved == null) {
resolved = EMPTY;
}
// If the first character is not a slash
if (!isFirstCharSlash(resolved)) {
// Prepend the slash
return ArchivePath.SEPARATOR + resolved;
}
// Return as-is
return resolved;
}
/**
* Obtains the parent of this Path, if exists, else null. For instance if the Path is "/my/path", the parent will be
* "/my". Each call will result in a new object reference, though subsequent calls upon the same Path will be equal
* by value.
*
* @return
*
* @param path
* The path whose parent context we should return
*/
static ArchivePath getParent(final ArchivePath path) {
// Precondition checks
assert path != null : "Path must be specified";
// Get the last index of "/"
final String resolvedContext = PathUtil.optionallyRemoveFollowingSlash(path.get());
final int lastIndex = resolvedContext.lastIndexOf(ArchivePath.SEPARATOR);
// If it either doesn't occur or is the root
if (lastIndex == -1 || (lastIndex == 0 && resolvedContext.length() == 1)) {
// No parent present, return null
return null;
}
// Get the parent context
final String sub = resolvedContext.substring(0, lastIndex);
// Return
return new BasicPath(sub);
}
// -------------------------------------------------------------------------------------||
// Internal Helper Methods -------------------------------------------------------------||
// -------------------------------------------------------------------------------------||
/**
* Returns whether or not the first character in the specified String is a slash
*/
private static boolean isFirstCharSlash(final String path) {
assertSpecified(path);
if (path.length() == 0) {
return false;
}
return path.charAt(0) == ArchivePath.SEPARATOR;
}
/**
* Returns whether or not the last character in the specified String is a slash
*/
private static boolean isLastCharSlash(final String path) {
assertSpecified(path);
if (path.length() == 0) {
return false;
}
return path.charAt(path.length() - 1) == ArchivePath.SEPARATOR;
}
/**
* Ensures the path is specified
*
* @param path
*/
private static void assertSpecified(final String path) {
// Precondition check
assert path != null : "Path must be specified";
}
}
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