The Element.java Java example source code
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* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file and, per its terms, should not be removed:
*
* Copyright (c) 2004 World Wide Web Consortium,
*
* (Massachusetts Institute of Technology, European Research Consortium for
* Informatics and Mathematics, Keio University). All Rights Reserved. This
* work is distributed under the W3C(r) Software License [1] 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.
*
* [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
*/
package org.w3c.dom;
/**
* The <code>Element interface represents an element in an HTML or XML
* document. Elements may have attributes associated with them; since the
* <code>Element interface inherits from Node, the
* generic <code>Node interface attribute attributes may
* be used to retrieve the set of all attributes for an element. There are
* methods on the <code>Element interface to retrieve either an
* <code>Attr object by name or an attribute value by name. In XML,
* where an attribute value may contain entity references, an
* <code>Attr object should be retrieved to examine the possibly
* fairly complex sub-tree representing the attribute value. On the other
* hand, in HTML, where all attributes have simple string values, methods to
* directly access an attribute value can safely be used as a convenience.
* <p >Note: In DOM Level 2, the method normalize is
* inherited from the <code>Node interface where it was moved.
* <p>See also the Document Object Model (DOM) Level 3 Core Specification.
*/
public interface Element extends Node {
/**
* The name of the element. If <code>Node.localName is different
* from <code>null, this attribute is a qualified name. For
* example, in:
* <pre> <elementExample id="demo"> ...
* </elementExample> , </pre>
* <code>tagName has the value
* <code>"elementExample". Note that this is case-preserving in
* XML, as are all of the operations of the DOM. The HTML DOM returns
* the <code>tagName of an HTML element in the canonical
* uppercase form, regardless of the case in the source HTML document.
*/
public String getTagName();
/**
* Retrieves an attribute value by name.
* @param name The name of the attribute to retrieve.
* @return The <code>Attr value as a string, or the empty string
* if that attribute does not have a specified or default value.
*/
public String getAttribute(String name);
/**
* Adds a new attribute. If an attribute with that name is already present
* in the element, its value is changed to be that of the value
* parameter. This value is a simple string; it is not parsed as it is
* being set. So any markup (such as syntax to be recognized as an
* entity reference) is treated as literal text, and needs to be
* appropriately escaped by the implementation when it is written out.
* In order to assign an attribute value that contains entity
* references, the user must create an <code>Attr node plus any
* <code>Text and EntityReference nodes, build the
* appropriate subtree, and use <code>setAttributeNode to assign
* it as the value of an attribute.
* <br>To set an attribute with a qualified name and namespace URI, use
* the <code>setAttributeNS method.
* @param name The name of the attribute to create or alter.
* @param value Value to set in string form.
* @exception DOMException
* INVALID_CHARACTER_ERR: Raised if the specified name is not an XML
* name according to the XML version in use specified in the
* <code>Document.xmlVersion attribute.
* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
*/
public void setAttribute(String name,
String value)
throws DOMException;
/**
* Removes an attribute by name. If a default value for the removed
* attribute is defined in the DTD, a new attribute immediately appears
* with the default value as well as the corresponding namespace URI,
* local name, and prefix when applicable. The implementation may handle
* default values from other schemas similarly but applications should
* use <code>Document.normalizeDocument() to guarantee this
* information is up-to-date.
* <br>If no attribute with this name is found, this method has no effect.
* <br>To remove an attribute by local name and namespace URI, use the
* <code>removeAttributeNS method.
* @param name The name of the attribute to remove.
* @exception DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
*/
public void removeAttribute(String name)
throws DOMException;
/**
* Retrieves an attribute node by name.
* <br>To retrieve an attribute node by qualified name and namespace URI,
* use the <code>getAttributeNodeNS method.
* @param name The name (<code>nodeName) of the attribute to
* retrieve.
* @return The <code>Attr node with the specified name (
* <code>nodeName) or null if there is no such
* attribute.
*/
public Attr getAttributeNode(String name);
/**
* Adds a new attribute node. If an attribute with that name (
* <code>nodeName) is already present in the element, it is
* replaced by the new one. Replacing an attribute node by itself has no
* effect.
* <br>To add a new attribute node with a qualified name and namespace
* URI, use the <code>setAttributeNodeNS method.
* @param newAttr The <code>Attr node to add to the attribute list.
* @return If the <code>newAttr attribute replaces an existing
* attribute, the replaced <code>Attr node is returned,
* otherwise <code>null is returned.
* @exception DOMException
* WRONG_DOCUMENT_ERR: Raised if <code>newAttr was created from a
* different document than the one that created the element.
* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an
* attribute of another <code>Element object. The DOM user must
* explicitly clone <code>Attr nodes to re-use them in other
* elements.
*/
public Attr setAttributeNode(Attr newAttr)
throws DOMException;
/**
* Removes the specified attribute node. If a default value for the
* removed <code>Attr node is defined in the DTD, a new node
* immediately appears with the default value as well as the
* corresponding namespace URI, local name, and prefix when applicable.
* The implementation may handle default values from other schemas
* similarly but applications should use
* <code>Document.normalizeDocument() to guarantee this
* information is up-to-date.
* @param oldAttr The <code>Attr node to remove from the attribute
* list.
* @return The <code>Attr node that was removed.
* @exception DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NOT_FOUND_ERR: Raised if oldAttr is not an attribute
* of the element.
*/
public Attr removeAttributeNode(Attr oldAttr)
throws DOMException;
/**
* Returns a <code>NodeList of all descendant Elements
* with a given tag name, in document order.
* @param name The name of the tag to match on. The special value "*"
* matches all tags.
* @return A list of matching <code>Element nodes.
*/
public NodeList getElementsByTagName(String name);
/**
* Retrieves an attribute value by local name and namespace URI.
* <br>Per [XML Namespaces]
* , applications must use the value <code>null as the
* <code>namespaceURI parameter for methods if they wish to have
* no namespace.
* @param namespaceURI The namespace URI of the attribute to retrieve.
* @param localName The local name of the attribute to retrieve.
* @return The <code>Attr value as a string, or the empty string
* if that attribute does not have a specified or default value.
* @exception DOMException
* NOT_SUPPORTED_ERR: May be raised if the implementation does not
* support the feature <code>"XML" and the language exposed
* through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01]).
* @since DOM Level 2
*/
public String getAttributeNS(String namespaceURI,
String localName)
throws DOMException;
/**
* Adds a new attribute. If an attribute with the same local name and
* namespace URI is already present on the element, its prefix is
* changed to be the prefix part of the <code>qualifiedName, and
* its value is changed to be the <code>value parameter. This
* value is a simple string; it is not parsed as it is being set. So any
* markup (such as syntax to be recognized as an entity reference) is
* treated as literal text, and needs to be appropriately escaped by the
* implementation when it is written out. In order to assign an
* attribute value that contains entity references, the user must create
* an <code>Attr node plus any Text and
* <code>EntityReference nodes, build the appropriate subtree,
* and use <code>setAttributeNodeNS or
* <code>setAttributeNode to assign it as the value of an
* attribute.
* <br>Per [XML Namespaces]
* , applications must use the value <code>null as the
* <code>namespaceURI parameter for methods if they wish to have
* no namespace.
* @param namespaceURI The namespace URI of the attribute to create or
* alter.
* @param qualifiedName The qualified name of the attribute to create or
* alter.
* @param value The value to set in string form.
* @exception DOMException
* INVALID_CHARACTER_ERR: Raised if the specified qualified name is not
* an XML name according to the XML version in use specified in the
* <code>Document.xmlVersion attribute.
* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NAMESPACE_ERR: Raised if the qualifiedName is
* malformed per the Namespaces in XML specification, if the
* <code>qualifiedName has a prefix and the
* <code>namespaceURI is null, if the
* <code>qualifiedName has a prefix that is "xml" and the
* <code>namespaceURI is different from "
* http://www.w3.org/XML/1998/namespace</a>", if the qualifiedName or its prefix is "xmlns" and the
* <code>namespaceURI is different from "http://www.w3.org/2000/xmlns/", or if the namespaceURI is "http://www.w3.org/2000/xmlns/" and neither the qualifiedName nor its prefix is "xmlns".
* <br>NOT_SUPPORTED_ERR: May be raised if the implementation does not
* support the feature <code>"XML" and the language exposed
* through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01]).
* @since DOM Level 2
*/
public void setAttributeNS(String namespaceURI,
String qualifiedName,
String value)
throws DOMException;
/**
* Removes an attribute by local name and namespace URI. If a default
* value for the removed attribute is defined in the DTD, a new
* attribute immediately appears with the default value as well as the
* corresponding namespace URI, local name, and prefix when applicable.
* The implementation may handle default values from other schemas
* similarly but applications should use
* <code>Document.normalizeDocument() to guarantee this
* information is up-to-date.
* <br>If no attribute with this local name and namespace URI is found,
* this method has no effect.
* <br>Per [XML Namespaces]
* , applications must use the value <code>null as the
* <code>namespaceURI parameter for methods if they wish to have
* no namespace.
* @param namespaceURI The namespace URI of the attribute to remove.
* @param localName The local name of the attribute to remove.
* @exception DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NOT_SUPPORTED_ERR: May be raised if the implementation does not
* support the feature <code>"XML" and the language exposed
* through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01]).
* @since DOM Level 2
*/
public void removeAttributeNS(String namespaceURI,
String localName)
throws DOMException;
/**
* Retrieves an <code>Attr node by local name and namespace URI.
* <br>Per [XML Namespaces]
* , applications must use the value <code>null as the
* <code>namespaceURI parameter for methods if they wish to have
* no namespace.
* @param namespaceURI The namespace URI of the attribute to retrieve.
* @param localName The local name of the attribute to retrieve.
* @return The <code>Attr node with the specified attribute local
* name and namespace URI or <code>null if there is no such
* attribute.
* @exception DOMException
* NOT_SUPPORTED_ERR: May be raised if the implementation does not
* support the feature <code>"XML" and the language exposed
* through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01]).
* @since DOM Level 2
*/
public Attr getAttributeNodeNS(String namespaceURI,
String localName)
throws DOMException;
/**
* Adds a new attribute. If an attribute with that local name and that
* namespace URI is already present in the element, it is replaced by
* the new one. Replacing an attribute node by itself has no effect.
* <br>Per [XML Namespaces]
* , applications must use the value <code>null as the
* <code>namespaceURI parameter for methods if they wish to have
* no namespace.
* @param newAttr The <code>Attr node to add to the attribute list.
* @return If the <code>newAttr attribute replaces an existing
* attribute with the same local name and namespace URI, the replaced
* <code>Attr node is returned, otherwise null is
* returned.
* @exception DOMException
* WRONG_DOCUMENT_ERR: Raised if <code>newAttr was created from a
* different document than the one that created the element.
* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an
* attribute of another <code>Element object. The DOM user must
* explicitly clone <code>Attr nodes to re-use them in other
* elements.
* <br>NOT_SUPPORTED_ERR: May be raised if the implementation does not
* support the feature <code>"XML" and the language exposed
* through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01]).
* @since DOM Level 2
*/
public Attr setAttributeNodeNS(Attr newAttr)
throws DOMException;
/**
* Returns a <code>NodeList of all the descendant
* <code>Elements with a given local name and namespace URI in
* document order.
* @param namespaceURI The namespace URI of the elements to match on. The
* special value "*" matches all namespaces.
* @param localName The local name of the elements to match on. The
* special value "*" matches all local names.
* @return A new <code>NodeList object containing all the matched
* <code>Elements.
* @exception DOMException
* NOT_SUPPORTED_ERR: May be raised if the implementation does not
* support the feature <code>"XML" and the language exposed
* through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01]).
* @since DOM Level 2
*/
public NodeList getElementsByTagNameNS(String namespaceURI,
String localName)
throws DOMException;
/**
* Returns <code>true when an attribute with a given name is
* specified on this element or has a default value, <code>false
* otherwise.
* @param name The name of the attribute to look for.
* @return <code>true if an attribute with the given name is
* specified on this element or has a default value, <code>false
* otherwise.
* @since DOM Level 2
*/
public boolean hasAttribute(String name);
/**
* Returns <code>true when an attribute with a given local name and
* namespace URI is specified on this element or has a default value,
* <code>false otherwise.
* <br>Per [XML Namespaces]
* , applications must use the value <code>null as the
* <code>namespaceURI parameter for methods if they wish to have
* no namespace.
* @param namespaceURI The namespace URI of the attribute to look for.
* @param localName The local name of the attribute to look for.
* @return <code>true if an attribute with the given local name
* and namespace URI is specified or has a default value on this
* element, <code>false otherwise.
* @exception DOMException
* NOT_SUPPORTED_ERR: May be raised if the implementation does not
* support the feature <code>"XML" and the language exposed
* through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01]).
* @since DOM Level 2
*/
public boolean hasAttributeNS(String namespaceURI,
String localName)
throws DOMException;
/**
* The type information associated with this element.
* @since DOM Level 3
*/
public TypeInfo getSchemaTypeInfo();
/**
* If the parameter <code>isId is true, this method
* declares the specified attribute to be a user-determined ID attribute
* . This affects the value of <code>Attr.isId and the behavior
* of <code>Document.getElementById, but does not change any
* schema that may be in use, in particular this does not affect the
* <code>Attr.schemaTypeInfo of the specified Attr
* node. Use the value <code>false for the parameter
* <code>isId to undeclare an attribute for being a
* user-determined ID attribute.
* <br> To specify an attribute by local name and namespace URI, use the
* <code>setIdAttributeNS method.
* @param name The name of the attribute.
* @param isId Whether the attribute is a of type ID.
* @exception DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NOT_FOUND_ERR: Raised if the specified node is not an attribute
* of this element.
* @since DOM Level 3
*/
public void setIdAttribute(String name,
boolean isId)
throws DOMException;
/**
* If the parameter <code>isId is true, this method
* declares the specified attribute to be a user-determined ID attribute
* . This affects the value of <code>Attr.isId and the behavior
* of <code>Document.getElementById, but does not change any
* schema that may be in use, in particular this does not affect the
* <code>Attr.schemaTypeInfo of the specified Attr
* node. Use the value <code>false for the parameter
* <code>isId to undeclare an attribute for being a
* user-determined ID attribute.
* @param namespaceURI The namespace URI of the attribute.
* @param localName The local name of the attribute.
* @param isId Whether the attribute is a of type ID.
* @exception DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NOT_FOUND_ERR: Raised if the specified node is not an attribute
* of this element.
* @since DOM Level 3
*/
public void setIdAttributeNS(String namespaceURI,
String localName,
boolean isId)
throws DOMException;
/**
* If the parameter <code>isId is true, this method
* declares the specified attribute to be a user-determined ID attribute
* . This affects the value of <code>Attr.isId and the behavior
* of <code>Document.getElementById, but does not change any
* schema that may be in use, in particular this does not affect the
* <code>Attr.schemaTypeInfo of the specified Attr
* node. Use the value <code>false for the parameter
* <code>isId to undeclare an attribute for being a
* user-determined ID attribute.
* @param idAttr The attribute node.
* @param isId Whether the attribute is a of type ID.
* @exception DOMException
* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
* <br>NOT_FOUND_ERR: Raised if the specified node is not an attribute
* of this element.
* @since DOM Level 3
*/
public void setIdAttributeNode(Attr idAttr,
boolean isId)
throws DOMException;
}
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