Java XML Attribute Namespace getNamespaceDeclarationPrefix(Attr attr)

Description

get Namespace Declaration Prefix

License

Apache License

Declaration

public static String getNamespaceDeclarationPrefix(Attr attr) 

Method Source Code

//package com.java2s;
/*//w  w  w .j  a v  a2 s . c o m
 * Copyright (c) 2010-2013 Evolveum
 *
 * 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.
 */

import org.w3c.dom.Attr;

public class Main {
    public static final String W3C_XML_SCHEMA_XMLNS_URI = "http://www.w3.org/2000/xmlns/";

    public static String getNamespaceDeclarationPrefix(Attr attr) {
        if (!W3C_XML_SCHEMA_XMLNS_URI.equals(attr.getNamespaceURI())) {
            throw new IllegalStateException(
                    "Attempt to get prefix from a attribute that is not a namespace declaration, it has namespace "
                            + attr.getNamespaceURI());
        }
        String attrName = attr.getName();
        if (attrName.startsWith("xmlns:")) {
            return attrName.substring(6);
        }
        if ("xmlns".equals(attrName)) {
            return null;
        }
        throw new IllegalStateException(
                "Attempt to get prefix from a attribute that is not a namespace declaration, it is " + attrName);
    }
}

Related

1. countNonNamespaceAttribures(NamedNodeMap attrs)
2. isNamespaceDef(Attr attr)
3. isNamespaceDefinition(Attr attr)
4. isNoNamespaceAttribute(final XMLStreamReader reader, final int index)
5. searchParentNamespaces(Node xml, String attribute)