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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.xml.bind.v2.schemagen;


/**
 * TODO: JAX-WS dependes on this class - consider moving it somewhere more stable, Notify JAX-WS before modifying anything...
 *
 * Other miscellaneous utility methods. 
 * 
 * @author
 *     Kohsuke Kawaguchi ([email protected])
 */
public final class Util {
    private Util() {}   // no instanciation please
    
    /**
     * Escape any characters that would cause the single arg constructor
     * of java.net.URI to complain about illegal chars.
     *
     * @param s source string to be escaped
     */
    public static String escapeURI(String s) {
        StringBuilder sb = new StringBuilder();
        for( int i = 0; i < s.length(); i++ ) {
            char c = s.charAt(i);
            if(Character.isSpaceChar(c)) {
                sb.append("%20");
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * Calculate the parent URI path of the given URI path.
     *
     * @param uriPath the uriPath (as returned by java.net.URI#getPath()
     * @return the parent URI path of the given URI path
     */
    public static String getParentUriPath(String uriPath) {
        int idx = uriPath.lastIndexOf('/');

        if (uriPath.endsWith("/")) {
            uriPath = uriPath.substring(0,idx); // trim trailing slash
            idx = uriPath.lastIndexOf('/'); // move idx to parent context
        }

        return uriPath.substring(0, idx)+"/";
    }

    /**
     * Calculate the normalized form of the given uriPath.
     *
     * For example:
     *    /a/b/c/ -> /a/b/c/
     *    /a/b/c  -> /a/b/
     *    /a/     -> /a/
     *    /a      -> /
     *
     * @param uriPath path of a URI (as returned by java.net.URI#getPath()
     * @return the normalized uri path
     */
    public static String normalizeUriPath(String uriPath) {
        if (uriPath.endsWith("/"))
            return uriPath;

        // the uri path should always have at least a leading slash,
        // so no need to make sure that ( idx == -1 )
        int idx = uriPath.lastIndexOf('/');
        return uriPath.substring(0, idx+1);
    }

    /**
     * determine if two Strings are equal ignoring case allowing null values
     *
     * @param s string 1
     * @param t string 2
     * @return true iff the given strings are equal ignoring case, false if they aren't
     * equal or either of them are null.
     */
    public static boolean equalsIgnoreCase(String s, String t) {
        if (s == t) return true;
        if ((s != null) && (t != null)) {
            return s.equalsIgnoreCase(t);
        }
        return false;
    }

    /**
     * determine if two Strings are iqual allowing null values
     *
     * @param s string 1
     * @param t string 2
     * @return true iff the strings are equal, false if they aren't equal or either of
     * them are null.
     */
    public static boolean equal(String s, String t) {
        if (s == t) return true;
        if ((s != null) && (t != null)) {
            return s.equals(t);
        }
        return false;
    }    
}