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	/*
	* reserved comment block
	* DO NOT REMOVE OR ALTER!
	*/
	/**
	* 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 com.sun.org.apache.xml.internal.security.utils;

	import java.math.BigInteger;
	import java.util.concurrent.ConcurrentHashMap;
	import java.util.Map;

	import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
	import org.w3c.dom.Attr;
	import org.w3c.dom.Document;
	import org.w3c.dom.Element;
	import org.w3c.dom.Node;
	import org.w3c.dom.NodeList;
	import org.w3c.dom.Text;

	/**
	* This is the base class to all Objects which have a direct 1:1 mapping to an
	* Element in a particular namespace.
	*/
	public abstract class ElementProxy {

	protected static final com.sun.org.slf4j.internal.Logger LOG =
	com.sun.org.slf4j.internal.LoggerFactory.getLogger(ElementProxy.class);

	/**
	* What XML element does this ElementProxy instance wrap?
	*/
	private Element wrappedElement;

	/** Field baseURI */
	protected String baseURI;

	/** Field doc */
	private Document wrappedDoc;

	/** Field prefixMappings */
	private static Map<String, String> prefixMappings = new ConcurrentHashMap<String, String>();

	/**
	* Constructor ElementProxy
	*
	*/
	public ElementProxy() {
	}

	/**
	* Constructor ElementProxy
	*
	* @param doc
	*/
	public ElementProxy(Document doc) {
	if (doc == null) {
	throw new RuntimeException("Document is null");
	}

	this.wrappedDoc = doc;
	this.wrappedElement = createElementForFamilyLocal(this.getBaseNamespace(), this.getBaseLocalName());
	}

	/**
	* Constructor ElementProxy
	*
	* @param element
	* @param baseURI
	* @throws XMLSecurityException
	*/
	public ElementProxy(Element element, String baseURI) throws XMLSecurityException {
	if (element == null) {
	throw new XMLSecurityException("ElementProxy.nullElement");
	}

	LOG.debug("setElement(\"{}\", \"{}\")", element.getTagName(), baseURI);

	setElement(element);
	this.baseURI = baseURI;

	this.guaranteeThatElementInCorrectSpace();
	}

	/**
	* Returns the namespace of the Elements of the sub-class.
	*
	* @return the namespace of the Elements of the sub-class.
	*/
	public abstract String getBaseNamespace();

	/**
	* Returns the localname of the Elements of the sub-class.
	*
	* @return the localname of the Elements of the sub-class.
	*/
	public abstract String getBaseLocalName();


	protected Element createElementForFamilyLocal(
	String namespace, String localName
	) {
	Document doc = getDocument();
	Element result = null;
	if (namespace == null) {
	result = doc.createElementNS(null, localName);
	} else {
	String baseName = this.getBaseNamespace();
	String prefix = ElementProxy.getDefaultPrefix(baseName);
	if (prefix == null \|\| prefix.length() == 0) {
	result = doc.createElementNS(namespace, localName);
	result.setAttributeNS(Constants.NamespaceSpecNS, "xmlns", namespace);
	} else {
	result = doc.createElementNS(namespace, prefix + ":" + localName);
	result.setAttributeNS(Constants.NamespaceSpecNS, "xmlns:" + prefix, namespace);
	}
	}
	return result;
	}


	/**
	* This method creates an Element in a given namespace with a given localname.
	* It uses the {@link ElementProxy#getDefaultPrefix} method to decide whether
	* a particular prefix is bound to that namespace.
	* <p></p>
	* This method was refactored out of the constructor.
	*
	* @param doc
	* @param namespace
	* @param localName
	* @return The element created.
	*/
	public static Element createElementForFamily(Document doc, String namespace, String localName) {
	Element result = null;
	String prefix = ElementProxy.getDefaultPrefix(namespace);

	if (namespace == null) {
	result = doc.createElementNS(null, localName);
	} else {
	if (prefix == null \|\| prefix.length() == 0) {
	result = doc.createElementNS(namespace, localName);
	result.setAttributeNS(Constants.NamespaceSpecNS, "xmlns", namespace);
	} else {
	result = doc.createElementNS(namespace, prefix + ":" + localName);
	result.setAttributeNS(Constants.NamespaceSpecNS, "xmlns:" + prefix, namespace);
	}
	}

	return result;
	}

	/**
	* Method setElement
	*
	* @param element
	* @param baseURI
	* @throws XMLSecurityException
	*/
	public void setElement(Element element, String baseURI) throws XMLSecurityException {
	if (element == null) {
	throw new XMLSecurityException("ElementProxy.nullElement");
	}

	LOG.debug("setElement({}, \"{}\")", element.getTagName(), baseURI);

	setElement(element);
	this.baseURI = baseURI;
	}

	/**
	* Returns the Element which was constructed by the Object.
	*
	* @return the Element which was constructed by the Object.
	*/
	public final Element getElement() {
	return this.wrappedElement;
	}

	/**
	* Returns the Element plus a leading and a trailing CarriageReturn Text node.
	*
	* @return the Element which was constructed by the Object.
	*/
	public final NodeList getElementPlusReturns() {

	HelperNodeList nl = new HelperNodeList();

	nl.appendChild(createText("\n"));
	nl.appendChild(getElement());
	nl.appendChild(createText("\n"));

	return nl;
	}

	protected Text createText(String text) {
	return this.wrappedDoc.createTextNode(text);
	}

	/**
	* Method getDocument
	*
	* @return the Document where this element is contained.
	*/
	public Document getDocument() {
	if (wrappedDoc == null) {
	wrappedDoc = XMLUtils.getOwnerDocument(wrappedElement);
	}
	return wrappedDoc;
	}

	/**
	* Method getBaseURI
	*
	* @return the base uri of the namespace of this element
	*/
	public String getBaseURI() {
	return this.baseURI;
	}

	/**
	* Method guaranteeThatElementInCorrectSpace
	*
	* @throws XMLSecurityException
	*/
	void guaranteeThatElementInCorrectSpace() throws XMLSecurityException {

	String expectedLocalName = this.getBaseLocalName();
	String expectedNamespaceUri = this.getBaseNamespace();

	String actualLocalName = getElement().getLocalName();
	String actualNamespaceUri = getElement().getNamespaceURI();

	if(!expectedNamespaceUri.equals(actualNamespaceUri)
	&& !expectedLocalName.equals(actualLocalName)) {
	Object exArgs[] = { actualNamespaceUri + ":" + actualLocalName,
	expectedNamespaceUri + ":" + expectedLocalName};
	throw new XMLSecurityException("xml.WrongElement", exArgs);
	}
	}

	/**
	* Method addBigIntegerElement
	*
	* @param bi
	* @param localname
	*/
	public void addBigIntegerElement(BigInteger bi, String localname) {
	if (bi != null) {
	Element e = XMLUtils.createElementInSignatureSpace(getDocument(), localname);

	byte[] bytes = XMLUtils.getBytes(bi, bi.bitLength());
	String encodedInt = XMLUtils.encodeToString(bytes);

	Document doc = e.getOwnerDocument();
	Text text = doc.createTextNode(encodedInt);

	e.appendChild(text);

	appendSelf(e);
	addReturnToSelf();
	}
	}

	protected void addReturnToSelf() {
	XMLUtils.addReturnToElement(getElement());
	}

	/**
	* Method addBase64Element
	*
	* @param bytes
	* @param localname
	*/
	public void addBase64Element(byte[] bytes, String localname) {
	if (bytes != null) {
	Element el = XMLUtils.createElementInSignatureSpace(getDocument(), localname);
	Text text = getDocument().createTextNode(XMLUtils.encodeToString(bytes));

	el.appendChild(text);

	appendSelf(el);
	if (!XMLUtils.ignoreLineBreaks()) {
	appendSelf(createText("\n"));
	}
	}
	}

	/**
	* Method addTextElement
	*
	* @param text
	* @param localname
	*/
	public void addTextElement(String text, String localname) {
	Element e = XMLUtils.createElementInSignatureSpace(getDocument(), localname);
	Text t = createText(text);

	appendOther(e, t);
	appendSelf(e);
	addReturnToSelf();
	}

	/**
	* Method addBase64Text
	*
	* @param bytes
	*/
	public void addBase64Text(byte[] bytes) {
	if (bytes != null) {
	Text t = XMLUtils.ignoreLineBreaks()
	? createText(XMLUtils.encodeToString(bytes))
	: createText("\n" + XMLUtils.encodeToString(bytes) + "\n");
	appendSelf(t);
	}
	}

	protected void appendSelf(ElementProxy toAppend) {
	getElement().appendChild(toAppend.getElement());
	}

	protected void appendSelf(Node toAppend) {
	getElement().appendChild(toAppend);
	}

	protected void appendOther(Element parent, Node toAppend) {
	parent.appendChild(toAppend);
	}

	/**
	* Method addText
	*
	* @param text
	*/
	public void addText(String text) {
	if (text != null) {
	Text t = createText(text);

	appendSelf(t);
	}
	}

	/**
	* Method getVal
	*
	* @param localname
	* @param namespace
	* @return The biginteger contained in the given element
	*/
	public BigInteger getBigIntegerFromChildElement(
	String localname, String namespace
	) {
	Node n = XMLUtils.selectNode(getFirstChild(), namespace, localname, 0);
	if (n != null) {
	return new BigInteger(1, XMLUtils.decode(XMLUtils.getFullTextChildrenFromNode(n)));
	}
	return null;
	}

	/**
	* Method getTextFromChildElement
	*
	* @param localname
	* @param namespace
	* @return the Text of the textNode
	*/
	public String getTextFromChildElement(String localname, String namespace) {
	return XMLUtils.selectNode(
	getFirstChild(),
	namespace,
	localname,
	0).getTextContent();
	}

	/**
	* Method getBytesFromTextChild
	*
	* @return The base64 bytes from the text children of this element
	* @throws XMLSecurityException
	*/
	public byte[] getBytesFromTextChild() throws XMLSecurityException {
	return XMLUtils.decode(getTextFromTextChild());
	}

	/**
	* Method getTextFromTextChild
	*
	* @return the Text obtained by concatenating all the text nodes of this
	* element
	*/
	public String getTextFromTextChild() {
	return XMLUtils.getFullTextChildrenFromNode(getElement());
	}

	/**
	* Method length
	*
	* @param namespace
	* @param localname
	* @return the number of elements {namespace}:localname under this element
	*/
	public int length(String namespace, String localname) {
	int number = 0;
	Node sibling = getFirstChild();
	while (sibling != null) {
	if (localname.equals(sibling.getLocalName())
	&& namespace.equals(sibling.getNamespaceURI())) {
	number++;
	}
	sibling = sibling.getNextSibling();
	}
	return number;
	}

	/**
	* Adds an xmlns: definition to the Element. This can be called as follows:
	*
	* <PRE>
	* // set namespace with ds prefix
	* xpathContainer.setXPathNamespaceContext("ds", "http://www.w3.org/2000/09/xmldsig#");
	* xpathContainer.setXPathNamespaceContext("xmlns:ds", "http://www.w3.org/2000/09/xmldsig#");
	* </PRE>
	*
	* @param prefix
	* @param uri
	* @throws XMLSecurityException
	*/
	public void setXPathNamespaceContext(String prefix, String uri)
	throws XMLSecurityException {
	String ns;

	if (prefix == null \|\| prefix.length() == 0) {
	throw new XMLSecurityException("defaultNamespaceCannotBeSetHere");
	} else if ("xmlns".equals(prefix)) {
	throw new XMLSecurityException("defaultNamespaceCannotBeSetHere");
	} else if (prefix.startsWith("xmlns:")) {
	ns = prefix;//"xmlns:" + prefix.substring("xmlns:".length());
	} else {
	ns = "xmlns:" + prefix;
	}

	Attr a = getElement().getAttributeNodeNS(Constants.NamespaceSpecNS, ns);

	if (a != null) {
	if (!a.getNodeValue().equals(uri)) {
	Object exArgs[] = { ns, getElement().getAttributeNS(null, ns) };

	throw new XMLSecurityException("namespacePrefixAlreadyUsedByOtherURI", exArgs);
	}
	return;
	}

	getElement().setAttributeNS(Constants.NamespaceSpecNS, ns, uri);
	}

	/**
	* Method setDefaultPrefix
	*
	* @param namespace
	* @param prefix
	* @throws XMLSecurityException
	* @throws SecurityException if a security manager is installed and the
	* caller does not have permission to set the default prefix
	*/
	public static void setDefaultPrefix(String namespace, String prefix)
	throws XMLSecurityException {
	JavaUtils.checkRegisterPermission();
	setNamespacePrefix(namespace, prefix);
	}

	private static void setNamespacePrefix(String namespace, String prefix)
	throws XMLSecurityException {
	if (prefixMappings.containsValue(prefix)) {
	String storedPrefix = prefixMappings.get(namespace);
	if (!storedPrefix.equals(prefix)) {
	Object exArgs[] = { prefix, namespace, storedPrefix };

	throw new XMLSecurityException("prefix.AlreadyAssigned", exArgs);
	}
	}

	if (Constants.SignatureSpecNS.equals(namespace)) {
	XMLUtils.setDsPrefix(prefix);
	} else if (Constants.SignatureSpec11NS.equals(namespace)) {
	XMLUtils.setDs11Prefix(prefix);
	} else if (EncryptionConstants.EncryptionSpecNS.equals(namespace)) {
	XMLUtils.setXencPrefix(prefix);
	}
	prefixMappings.put(namespace, prefix);
	}

	/**
	* This method registers the default prefixes.
	*/
	public static void registerDefaultPrefixes() throws XMLSecurityException {
	setNamespacePrefix("http://www.w3.org/2000/09/xmldsig#", "ds");
	setNamespacePrefix("http://www.w3.org/2001/04/xmlenc#", "xenc");
	setNamespacePrefix("http://www.w3.org/2009/xmlenc11#", "xenc11");
	setNamespacePrefix("http://www.xmlsecurity.org/experimental#", "experimental");
	setNamespacePrefix("http://www.w3.org/2002/04/xmldsig-filter2", "dsig-xpath-old");
	setNamespacePrefix("http://www.w3.org/2002/06/xmldsig-filter2", "dsig-xpath");
	setNamespacePrefix("http://www.w3.org/2001/10/xml-exc-c14n#", "ec");
	setNamespacePrefix(
	"http://www.nue.et-inf.uni-siegen.de/~geuer-pollmann/#xpathFilter", "xx"
	);
	setNamespacePrefix("http://www.w3.org/2009/xmldsig11#", "dsig11");
	}

	/**
	* Method getDefaultPrefix
	*
	* @param namespace
	* @return the default prefix bind to this element.
	*/
	public static String getDefaultPrefix(String namespace) {
	return prefixMappings.get(namespace);
	}

	/**
	* New value for the wrapped XML element that this object is a proxy for.
	*
	* @param elem New element
	*
	* @see #getElement()
	*/
	protected void setElement(Element elem) {
	wrappedElement = elem;
	}

	/**
	* Set a new value for the wrapped document that this object is a proxy for.
	*
	* @param doc New document object being wrapped.
	*
	* @see #getDocument()
	*/
	protected void setDocument(Document doc) {
	wrappedDoc = doc;
	}

	protected String getLocalAttribute(String attrName) {
	return getElement().getAttributeNS(null, attrName);
	}

	protected void setLocalAttribute(String attrName, String value) {
	getElement().setAttributeNS(null, attrName, value);
	}

	protected void setLocalIdAttribute(String attrName, String value) {

	if (value != null) {
	Attr attr = getDocument().createAttributeNS(null, attrName);
	attr.setValue(value);
	getElement().setAttributeNodeNS(attr);
	getElement().setIdAttributeNode(attr, true);
	}
	else {
	getElement().removeAttributeNS(null, attrName);
	}
	}

	protected Node getFirstChild() {
	return getElement().getFirstChild();
	}

	}

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