Returns the parent of the specified URI.

        


/*
  Copyright 2009 Tomer Gabel <tomer@tomergabel.com>

  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.


  ant-intellij-tasks project (http://code.google.com/p/ant-intellij-tasks/)

  $Id: UriUtils.java 106 2009-09-30 02:07:29Z tomergabel $
*/

//package com.tomergabel.util;

import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;

/**
 * A static container class for URI-related utility functions.
 */
public final class UriUtils {
      /**
     * A static URI which, when resolved against another URI, returns the other URI's parent.
     */
    private static final URI up = URI.create( ".." );

    /**
     * Returns the parent of the specified URI.
     * <p/>
     * For example, applying this method to the URI &quot;<tt>http://www.site.com/articles/article.html</tt>&quot; will
     * return the URI for &quot;<tt>http://www.site.com/articles/</tt>&quot;.
     *
     * @param uri The URI for which to return the parent.
     * @return The parent of the specified URI.
     * @throws IllegalArgumentException <ul> <li>The URI cannot be null></li> <li>Can't resolve parent for the specified
     *                                  URI.</li> </ul>
     */
    public static URI getParent( final URI uri ) throws IllegalArgumentException {
        if ( uri == null )
            throw new IllegalArgumentException( "The URI cannot be null." );

        final String path = uri.toString();
        final int finalSeparator = Math.max( path.lastIndexOf( '/' ), path.lastIndexOf( '\\' ) );
        final int extension = path.lastIndexOf( '.' );
        if ( extension > finalSeparator )
            try {
                // Extract all but final segment
                return new URI( path.substring( 0, finalSeparator + 1 ) ).normalize();
            } catch ( URISyntaxException e ) {
                throw new IllegalArgumentException( "Can't resolve parent for the specified URI.", e );
            }
        else
            return uri.resolve( up );
    }
}

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Returns the parent of the specified URI. : Concurrent « Collections Data Structure « Java

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