| /* |
| * $Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2000 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Crimson" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 1999, Sun Microsystems, Inc., |
| * http://www.sun.com. For more information on the Apache Software |
| * Foundation, please see <http://www.apache.org/>. |
| */ |
| |
| package org.apache.xerces.tree; |
| |
| /** |
| * This class contains static methods used to determine whether identifiers |
| * may appear in certain roles in XML documents. Such methods are used |
| * both to parse and to create such documents. |
| * |
| * @version 1.4 |
| * @author David Brownell |
| */ |
| public class XmlNames |
| { |
| private XmlNames () { } |
| |
| |
| /** |
| * Returns true if the value is a legal XML name. |
| * |
| * @param value the string being tested |
| */ |
| public static boolean isName (String value) |
| { |
| if (value == null) |
| return false; |
| |
| char c = value.charAt (0); |
| if (!XmlChars.isLetter (c) && c != '_' && c != ':') |
| return false; |
| for (int i = 1; i < value.length (); i++) |
| if (!XmlChars.isNameChar (value.charAt (i))) |
| return false; |
| return true; |
| } |
| |
| /** |
| * Returns true if the value is a legal "unqualified" XML name, as |
| * defined in the XML Namespaces proposed recommendation. |
| * These are normal XML names, except that they may not contain |
| * a "colon" character. |
| * |
| * @param value the string being tested |
| */ |
| public static boolean isUnqualifiedName (String value) |
| { |
| if (value == null || value.length() == 0) |
| return false; |
| |
| char c = value.charAt (0); |
| if (!XmlChars.isLetter (c) && c != '_') |
| return false; |
| for (int i = 1; i < value.length (); i++) |
| if (!XmlChars.isNCNameChar (value.charAt (i))) |
| return false; |
| return true; |
| } |
| |
| /** |
| * Returns true if the value is a legal "qualified" XML name, as defined |
| * in the XML Namespaces proposed recommendation. Qualified names are |
| * composed of an optional prefix (an unqualified name), followed by a |
| * colon, and a required "local part" (an unqualified name). Prefixes are |
| * declared, and correspond to particular URIs which scope the "local |
| * part" of the name. (This method cannot check whether the prefix of a |
| * name has been declared.) |
| * |
| * @param value the string being tested |
| */ |
| public static boolean isQualifiedName (String value) |
| { |
| if (value == null) |
| return false; |
| |
| // [6] QName ::= (Prefix ':')? LocalPart |
| // [7] Prefix ::= NCName |
| // [8] LocalPart ::= NCName |
| |
| int first = value.indexOf (':'); |
| |
| // no Prefix, only check LocalPart |
| if (first <= 0) |
| return isUnqualifiedName (value); |
| |
| // Prefix exists, check everything |
| |
| int last = value.lastIndexOf (':'); |
| if (last != first) |
| return false; |
| |
| return isUnqualifiedName (value.substring (0, first)) |
| && isUnqualifiedName (value.substring (first + 1)); |
| } |
| |
| /** |
| * This method returns true if the identifier is a "name token" |
| * as defined in the XML specification. Like names, these |
| * may only contain "name characters"; however, they do not need |
| * to have letters as their initial characters. Attribute values |
| * defined to be of type NMTOKEN(S) must satisfy this predicate. |
| * |
| * @param token the string being tested |
| */ |
| public static boolean isNmtoken (String token) |
| { |
| int length = token.length (); |
| |
| for (int i = 0; i < length; i++) |
| if (!XmlChars.isNameChar (token.charAt (i))) |
| return false; |
| return true; |
| } |
| |
| |
| /** |
| * This method returns true if the identifier is a "name token" as |
| * defined by the XML Namespaces proposed recommendation. |
| * These are like XML "name tokens" but they may not contain the |
| * "colon" character. |
| * |
| * @see #isNmtoken |
| * |
| * @param token the string being tested |
| */ |
| public static boolean isNCNmtoken (String token) |
| { |
| return isNmtoken (token) && token.indexOf (':') < 0; |
| } |
| |
| /** |
| * Return the Prefix of qualifiedName. Does not check that Prefix is a |
| * valid NCName. |
| * |
| * @param qualifiedName name to find the Prefix of |
| * @return prefix or null if it has none |
| */ |
| public static String getPrefix(String qualifiedName) { |
| // [6] QName ::= (Prefix ':')? LocalPart |
| // [7] Prefix ::= NCName |
| int index = qualifiedName.indexOf(':'); |
| return index <= 0 ? null : qualifiedName.substring(0, index); |
| } |
| |
| /** |
| * Return the LocalPart of qualifiedName. Does not check that Prefix is a |
| * valid NCName. |
| * |
| * @param qualifiedName name to find the LocalPart of |
| * @return LocalPart or null if it has none |
| */ |
| public static String getLocalPart(String qualifiedName) { |
| // [6] QName ::= (Prefix ':')? LocalPart |
| // [8] LocalPart ::= NCName |
| int index = qualifiedName.indexOf(':'); |
| if (index < 0) { |
| return qualifiedName; |
| } |
| |
| // ':' at end of qualifiedName |
| if (index == qualifiedName.length() - 1) { |
| return null; |
| } |
| |
| return qualifiedName.substring(index + 1); |
| } |
| } |