Get namespace declarations of specified XML element. - Java XML

Java examples for XML:DOM Element

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Description

Get namespace declarations of specified XML element.

Demo Code

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 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *   http://www.apache.org/licenses/LICENSE-2.0
 *  
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 *  software distributed under the License is distributed on an
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//package com.java2s;

import java.util.HashMap;

import java.util.Map;
import java.util.TreeMap;

import org.w3c.dom.Attr;

import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;

public class Main {
    private static final String XMLNS_PREFIX = "xmlns";
    private static final String XMLNS_PREFIX_COLON = XMLNS_PREFIX + ':';
    private static final int XMLNS_PREFIX_COLON_LENGTH = XMLNS_PREFIX_COLON
            .length();

    /**
     * Get namespace declarations of specified element. Any 'inherited'
     * declarations are NOT present.
     * 
     * @param element element to get namespaces from
     * @param parentPrefixes parent prefixes (the default values)
     * @return map of namespaces (prefix -> namespace)
     */
    public static Map<String, String> getDeclaredPrefixes(Element element,
            Map<String, String> parentPrefixes) {

        Map<String, String> ret = new TreeMap<String, String>(
                parentPrefixes);

        // default namespace
        if (element.getNamespaceURI() != null) {
            ret.put("", element.getNamespaceURI()); //$NON-NLS-1$
        }

        // other namespaces
        NamedNodeMap attrs = element.getAttributes();
        for (int i = 0; i < attrs.getLength(); i++) {

            Attr attr = (Attr) attrs.item(i);
            String attrName = attr.getName();
            if (attrName.startsWith(XMLNS_PREFIX_COLON)) {
                ret.put(attrName.substring(XMLNS_PREFIX_COLON_LENGTH),
                        attr.getValue());
            }
            // if(attrName.equals(XMLNS_PREFIX)) {
            // // default namespace
            // ret.put("", attr.getValue());
            // }
        }
        return ret;
    }

    /**
     * Get attributes without namespace declarations of specified element.
     * 
     * @param element element to get namespaces from
     * @return map of attributes (name -> value)
     */
    public static Map<String, String> getAttributes(Element element) {

        Map<String, String> ret = new HashMap<String, String>();
        NamedNodeMap attrs = element.getAttributes();
        for (int i = 0; i < attrs.getLength(); i++) {

            Attr attr = (Attr) attrs.item(i);
            String attrName = attr.getName();
            if (!attrName.startsWith(XMLNS_PREFIX_COLON)
                    && !attrName.equals(XMLNS_PREFIX)) {
                ret.put(attrName, attr.getValue());
            }
        }
        return ret;
    }
}

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