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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * 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
 * 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.
 */
package org.apache.xml.security.transforms.params;

import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.transforms.TransformParam;
import org.apache.xml.security.utils.ElementProxy;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * This Object serves as Content for the ds:Transforms for exclusive
 * Canonicalization.
 * 

 * It implements the {@link Element} interface
 * and can be used directly in a DOM tree.
 *
 * @author Christian Geuer-Pollmann
 */
public class InclusiveNamespaces extends ElementProxy implements TransformParam {

    /** Field _TAG_EC_INCLUSIVENAMESPACES */
    public static final String _TAG_EC_INCLUSIVENAMESPACES =
        "InclusiveNamespaces";

    /** Field _ATT_EC_PREFIXLIST */
    public static final String _ATT_EC_PREFIXLIST = "PrefixList";

    /** Field ExclusiveCanonicalizationNamespace */
    public static final String ExclusiveCanonicalizationNamespace =
        "http://www.w3.org/2001/10/xml-exc-c14n#";

    /**
     * Constructor XPathContainer
     *
     * @param doc
     * @param prefixList
     */
    public InclusiveNamespaces(Document doc, String prefixList) {
        this(doc, InclusiveNamespaces.prefixStr2Set(prefixList));
    }

    /**
     * Constructor InclusiveNamespaces
     *
     * @param doc
     * @param prefixes
     */
    public InclusiveNamespaces(Document doc, Set prefixes) {
        super(doc);

        SortedSet prefixList = null;
        if (prefixes instanceof SortedSet) {
            prefixList = (SortedSet)prefixes;
        } else {
            prefixList = new TreeSet(prefixes);
        }

        StringBuilder sb = new StringBuilder();
        for (String prefix : prefixList) {
            if (prefix.equals("xmlns")) {
                sb.append("#default ");
            } else {
                sb.append(prefix + " ");
            }
        }
        
        this.constructionElement.setAttributeNS(
            null, InclusiveNamespaces._ATT_EC_PREFIXLIST, sb.toString().trim());
    }

    /**
     * Constructor InclusiveNamespaces
     *
     * @param element
     * @param BaseURI
     * @throws XMLSecurityException
     */
    public InclusiveNamespaces(Element element, String BaseURI)
        throws XMLSecurityException {
        super(element, BaseURI);
    }

    /**
     * Method getInclusiveNamespaces
     *
     * @return The Inclusive Namespace string
     */
    public String getInclusiveNamespaces() {
        return this.constructionElement.getAttributeNS(null, InclusiveNamespaces._ATT_EC_PREFIXLIST);
    }
    
    /**
     * Decodes the inclusiveNamespaces String and returns all
     * selected namespace prefixes as a Set. The #default
     * namespace token is represented as an empty namespace prefix
     * ("xmlns").
     * 

     * The String inclusiveNamespaces=" xenc    ds #default"
     * is returned as a Set containing the following Strings:
     * 
     * xmlns
     * xenc
     * ds
     * 
     *
     * @param inclusiveNamespaces
     * @return A set to string
     */
    public static SortedSet prefixStr2Set(String inclusiveNamespaces) {
        SortedSet prefixes = new TreeSet();

        if ((inclusiveNamespaces == null) || (inclusiveNamespaces.length() == 0)) {
            return prefixes;
        }

        String[] tokens = inclusiveNamespaces.split("\\s");
        for (String prefix : tokens) {
            if (prefix.equals("#default")) {
                prefixes.add("xmlns");
            } else {
                prefixes.add(prefix);
            }
        }

        return prefixes;
    }

    /**
     * Method getBaseNamespace
     *
     * @inheritDoc
     */
    public String getBaseNamespace() {
        return InclusiveNamespaces.ExclusiveCanonicalizationNamespace;
    }

    /**
     * Method getBaseLocalName
     *
     * @inheritDoc
     */
    public String getBaseLocalName() {
        return InclusiveNamespaces._TAG_EC_INCLUSIVENAMESPACES;
    }
}