/*
 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package com.sun.xml.internal.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 (kohsuke.kawaguchi@sun.com)
 */
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;
    }
}
