| /* |
| * Copyright (c) 2009, 2013, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.xml.internal.dtdparser; |
| |
| |
| /** |
| * 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. |
| * |
| * @author David Brownell |
| * @version 1.1, 00/08/05 |
| */ |
| 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. |
| * |
| * @param token the string being tested |
| * @see #isNmtoken |
| */ |
| public static boolean isNCNmtoken(String token) { |
| return isNmtoken(token) && token.indexOf(':') < 0; |
| } |
| } |