JavaTM 2 Platform
Std. Ed. v1.4.2

javax.imageio.metadata
Class IIOMetadataNode

java.lang.Object
  extended byjavax.imageio.metadata.IIOMetadataNode
All Implemented Interfaces:
Element, Node, NodeList

public class IIOMetadataNode
extends Object
implements Element, NodeList

A class representing a node in a meta-data tree, which implements the org.w3c.dom.Element interface and additionally allows for the storage of non-textual objects via the getUserObject and setUserObject methods.

This class is not intended to be used for general XML processing. In particular, Element nodes created within the Image I/O API are not compatible with those created by Sun's standard implementation of the org.w3.dom API. In particular, the implementation is tuned for simple uses and may not perform well for intensive processing.

Namespaces are ignored in this implementation. The terms "tag name" and "node name" are always considered to be synonymous.

See Also:
IIOMetadata.getAsTree(java.lang.String), IIOMetadata.setFromTree(java.lang.String, org.w3c.dom.Node), IIOMetadata.mergeTree(java.lang.String, org.w3c.dom.Node)

Field Summary
 
Fields inherited from interface org.w3c.dom.Node
ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE
 
Constructor Summary
IIOMetadataNode()
          Constructs an empty IIOMetadataNode.
IIOMetadataNode(String nodeName)
          Constructs an IIOMetadataNode with a given node name.
 
Method Summary
 Node appendChild(Node newChild)
          Adds the node newChild to the end of the list of children of this node.
 Node cloneNode(boolean deep)
          Returns a duplicate of this node.
 String getAttribute(String name)
          Retrieves an attribute value by name.
 Attr getAttributeNode(String name)
          Retrieves an attribute node by name.
 Attr getAttributeNodeNS(String namespaceURI, String localName)
          Equivalent to getAttributeNode(localName).
 String getAttributeNS(String namespaceURI, String localName)
          Equivalent to getAttribute(localName).
 NamedNodeMap getAttributes()
          A NamedNodeMap containing the attributes of this node (if it is an Element) or null otherwise.
 NodeList getChildNodes()
          A NodeList that contains all children of this node.
 NodeList getElementsByTagName(String name)
          Returns a NodeList of all descendant Elements with a given tag name, in the order in which they are encountered in a preorder traversal of this Element tree.
 NodeList getElementsByTagNameNS(String namespaceURI, String localName)
          Equivalent to getElementsByTagName(localName).
 Node getFirstChild()
          Returns the first child of this node, or null if the node has no children.
 Node getLastChild()
          Returns the last child of this node, or null if the node has no children.
 int getLength()
          The number of nodes in the list.
 String getLocalName()
          Equivalent to getNodeName.
 String getNamespaceURI()
          Returns null, since namespaces are not supported.
 Node getNextSibling()
          Returns the next sibling of this node, or null if the node has no next sibling.
 String getNodeName()
          Returns the node name associated with this node.
 short getNodeType()
          Returns the node type, which is always ELEMENT_NODE.
 String getNodeValue()
          The value of this node, depending on its type; see the table above.
 Document getOwnerDocument()
          Returns null, since IIOMetadataNodes do not belong to any Document.
 Node getParentNode()
          Returns the parent of this node.
 String getPrefix()
          Returns null, since namespaces are not supported.
 Node getPreviousSibling()
          Returns the previous sibling of this node, or null if this node has no previous sibling.
 String getTagName()
          The name of the element.
 Object getUserObject()
          Returns the Object value associated with this node.
 boolean hasAttribute(String name)
          Returns true when an attribute with a given name is specified on this element or has a default value, false otherwise.
 boolean hasAttributeNS(String namespaceURI, String localName)
          Equivalent to hasAttribute(localName).
 boolean hasAttributes()
          Returns whether this node (if it is an element) has any attributes.
 boolean hasChildNodes()
          Returns true if this node has child nodes.
 Node insertBefore(Node newChild, Node refChild)
          Inserts the node newChild before the existing child node refChild.
 boolean isSupported(String feature, String version)
          Returns false since DOM features are not supported.
 Node item(int index)
          Returns the indexth item in the collection.
 void normalize()
          Does nothing, since IIOMetadataNodes do not contain Text children.
 void removeAttribute(String name)
          Removes an attribute by name.
 Attr removeAttributeNode(Attr oldAttr)
          Removes the specified attribute node.
 void removeAttributeNS(String namespaceURI, String localName)
          Equivalent to removeAttribute(localName).
 Node removeChild(Node oldChild)
          Removes the child node indicated by oldChild from the list of children, and returns it.
 Node replaceChild(Node newChild, Node oldChild)
          Replaces the child node oldChild with newChild in the list of children, and returns the oldChild node.
 void setAttribute(String name, String value)
          Adds a new attribute.
 Attr setAttributeNode(Attr newAttr)
          Adds a new attribute node.
 Attr setAttributeNodeNS(Attr newAttr)
          Equivalent to setAttributeNode(newAttr).
 void setAttributeNS(String namespaceURI, String qualifiedName, String value)
          Equivalent to setAttribute(qualifiedName, value).
 void setNodeValue(String nodeValue)
          The value of this node, depending on its type; see the table above.
 void setPrefix(String prefix)
          Does nothing, since namespaces are not supported.
 void setUserObject(Object userObject)
          Sets the value associated with this node.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

IIOMetadataNode

public IIOMetadataNode()
Constructs an empty IIOMetadataNode.


IIOMetadataNode

public IIOMetadataNode(String nodeName)
Constructs an IIOMetadataNode with a given node name.

Parameters:
nodeName - the name of the node, as a String.
Method Detail

getNodeName

public String getNodeName()
Returns the node name associated with this node.

Specified by:
getNodeName in interface Node
Returns:
the node name, as a String.

getNodeValue

public String getNodeValue()
                    throws DOMException
Description copied from interface: Node
The value of this node, depending on its type; see the table above. When it is defined to be null, setting it has no effect.

Specified by:
getNodeValue in interface Node
Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.

setNodeValue

public void setNodeValue(String nodeValue)
                  throws DOMException
Description copied from interface: Node
The value of this node, depending on its type; see the table above. When it is defined to be null, setting it has no effect.

Specified by:
setNodeValue in interface Node
Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.

getNodeType

public short getNodeType()
Returns the node type, which is always ELEMENT_NODE.

Specified by:
getNodeType in interface Node
Returns:
the short value ELEMENT_NODE.

getParentNode

public Node getParentNode()
Returns the parent of this node. A null value indicates that the node is the root of its own tree. To add a node to an existing tree, use one of the insertBefore, replaceChild, or appendChild methods.

Specified by:
getParentNode in interface Node
Returns:
the parent, as a Node.
See Also:
insertBefore(org.w3c.dom.Node, org.w3c.dom.Node), replaceChild(org.w3c.dom.Node, org.w3c.dom.Node), appendChild(org.w3c.dom.Node)

getChildNodes

public NodeList getChildNodes()
Description copied from interface: Node
A NodeList that contains all children of this node. If there are no children, this is a NodeList containing no nodes.

Specified by:
getChildNodes in interface Node

getFirstChild

public Node getFirstChild()
Returns the first child of this node, or null if the node has no children.

Specified by:
getFirstChild in interface Node
Returns:
the first child, as a Node, or null

getLastChild

public Node getLastChild()
Returns the last child of this node, or null if the node has no children.

Specified by:
getLastChild in interface Node
Returns:
the last child, as a Node, or null.

getPreviousSibling

public Node getPreviousSibling()
Returns the previous sibling of this node, or null if this node has no previous sibling.

Specified by:
getPreviousSibling in interface Node
Returns:
the previous sibling, as a Node, or null.

getNextSibling

public Node getNextSibling()
Returns the next sibling of this node, or null if the node has no next sibling.

Specified by:
getNextSibling in interface Node
Returns:
the next sibling, as a Node, or null.

getAttributes

public NamedNodeMap getAttributes()
Description copied from interface: Node
A NamedNodeMap containing the attributes of this node (if it is an Element) or null otherwise.

Specified by:
getAttributes in interface Node

getOwnerDocument

public Document getOwnerDocument()
Returns null, since IIOMetadataNodes do not belong to any Document.

Specified by:
getOwnerDocument in interface Node
Returns:
null.

insertBefore

public Node insertBefore(Node newChild,
                         Node refChild)
Inserts the node newChild before the existing child node refChild. If refChild is null, insert newChild at the end of the list of children.

Specified by:
insertBefore in interface Node
Parameters:
newChild - the Node to insert.
refChild - the reference Node.
Returns:
the node being inserted.
Throws:
IllegalArgumentException - if newChild is null.

replaceChild

public Node replaceChild(Node newChild,
                         Node oldChild)
Replaces the child node oldChild with newChild in the list of children, and returns the oldChild node.

Specified by:
replaceChild in interface Node
Parameters:
newChild - the Node to insert.
oldChild - the Node to be replaced.
Returns:
the node replaced.
Throws:
IllegalArgumentException - if newChild is null.

removeChild

public Node removeChild(Node oldChild)
Removes the child node indicated by oldChild from the list of children, and returns it.

Specified by:
removeChild in interface Node
Parameters:
oldChild - the Node to be removed.
Returns:
the node removed.
Throws:
IllegalArgumentException - if oldChild is null.

appendChild

public Node appendChild(Node newChild)
Adds the node newChild to the end of the list of children of this node.

Specified by:
appendChild in interface Node
Parameters:
newChild - the Node to insert.
Returns:
the node added.
Throws:
IllegalArgumentException - if newChild is null.

hasChildNodes

public boolean hasChildNodes()
Returns true if this node has child nodes.

Specified by:
hasChildNodes in interface Node
Returns:
true if this node has children.

cloneNode

public Node cloneNode(boolean deep)
Returns a duplicate of this node. The duplicate node has no parent (getParentNode returns null). If a shallow clone is being performed (deep is false), the new node will not have any children or siblings. If a deep clone is being performed, the new node will form the root of a complete cloned subtree.

Specified by:
cloneNode in interface Node
Parameters:
deep - if true, recursively clone the subtree under the specified node; if false, clone only the node itself.
Returns:
the duplicate node.

normalize

public void normalize()
Does nothing, since IIOMetadataNodes do not contain Text children.

Specified by:
normalize in interface Node

isSupported

public boolean isSupported(String feature,
                           String version)
Returns false since DOM features are not supported.

Specified by:
isSupported in interface Node
Parameters:
feature - a String, which is ignored.
version - a String, which is ignored.
Returns:
false.

getNamespaceURI

public String getNamespaceURI()
                       throws DOMException
Returns null, since namespaces are not supported.

Specified by:
getNamespaceURI in interface Node
Throws:
DOMException

getPrefix

public String getPrefix()
Returns null, since namespaces are not supported.

Specified by:
getPrefix in interface Node
Returns:
null.
See Also:
setPrefix(java.lang.String)

setPrefix

public void setPrefix(String prefix)
Does nothing, since namespaces are not supported.

Specified by:
setPrefix in interface Node
Parameters:
prefix - a String, which is ignored.
See Also:
getPrefix()

getLocalName

public String getLocalName()
Equivalent to getNodeName.

Specified by:
getLocalName in interface Node
Returns:
the node name, as a String.

getTagName

public String getTagName()
Description copied from interface: Element
The name of the element. For example, in:
 <elementExample 
 id="demo"> ... </elementExample> , 
tagName has the value "elementExample". Note that this is case-preserving in XML, as are all of the operations of the DOM. The HTML DOM returns the tagName of an HTML element in the canonical uppercase form, regardless of the case in the source HTML document.

Specified by:
getTagName in interface Element

getAttribute

public String getAttribute(String name)
Description copied from interface: Element
Retrieves an attribute value by name.

Specified by:
getAttribute in interface Element
Parameters:
name - The name of the attribute to retrieve.
Returns:
The Attr value as a string, or the empty string if that attribute does not have a specified or default value.

getAttributeNS

public String getAttributeNS(String namespaceURI,
                             String localName)
Equivalent to getAttribute(localName).

Specified by:
getAttributeNS in interface Element
Parameters:
namespaceURI - The namespace URI of the attribute to retrieve.
localName - The local name of the attribute to retrieve.
Returns:
The Attr value as a string, or the empty string if that attribute does not have a specified or default value.
See Also:
setAttributeNS(java.lang.String, java.lang.String, java.lang.String)

setAttribute

public void setAttribute(String name,
                         String value)
Description copied from interface: Element
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 Attr node plus any Text and EntityReference nodes, build the appropriate subtree, and use setAttributeNode to assign it as the value of an attribute.
To set an attribute with a qualified name and namespace URI, use the setAttributeNS method.

Specified by:
setAttribute in interface Element
Parameters:
name - The name of the attribute to create or alter.
value - Value to set in string form.

setAttributeNS

public void setAttributeNS(String namespaceURI,
                           String qualifiedName,
                           String value)
Equivalent to setAttribute(qualifiedName, value).

Specified by:
setAttributeNS in interface Element
Parameters:
namespaceURI - The namespace URI of the attribute to create or alter.
qualifiedName - The qualified name of the attribute to create or alter.
value - The value to set in string form.
See Also:
getAttributeNS(java.lang.String, java.lang.String)

removeAttribute

public void removeAttribute(String name)
Description copied from interface: Element
Removes an attribute by name. If the removed attribute is known to have a default value, an attribute immediately appears containing the default value as well as the corresponding namespace URI, local name, and prefix when applicable.
To remove an attribute by local name and namespace URI, use the removeAttributeNS method.

Specified by:
removeAttribute in interface Element
Parameters:
name - The name of the attribute to remove.

removeAttributeNS

public void removeAttributeNS(String namespaceURI,
                              String localName)
Equivalent to removeAttribute(localName).

Specified by:
removeAttributeNS in interface Element
Parameters:
namespaceURI - The namespace URI of the attribute to remove.
localName - The local name of the attribute to remove.

getAttributeNode

public Attr getAttributeNode(String name)
Description copied from interface: Element
Retrieves an attribute node by name.
To retrieve an attribute node by qualified name and namespace URI, use the getAttributeNodeNS method.

Specified by:
getAttributeNode in interface Element
Parameters:
name - The name (nodeName) of the attribute to retrieve.
Returns:
The Attr node with the specified name ( nodeName) or null if there is no such attribute.

getAttributeNodeNS

public Attr getAttributeNodeNS(String namespaceURI,
                               String localName)
Equivalent to getAttributeNode(localName).

Specified by:
getAttributeNodeNS in interface Element
Parameters:
namespaceURI - The namespace URI of the attribute to retrieve.
localName - The local name of the attribute to retrieve.
Returns:
The Attr node with the specified attribute local name and namespace URI or null if there is no such attribute.
See Also:
setAttributeNodeNS(org.w3c.dom.Attr)

setAttributeNode

public Attr setAttributeNode(Attr newAttr)
                      throws DOMException
Description copied from interface: Element
Adds a new attribute node. If an attribute with that name ( nodeName) is already present in the element, it is replaced by the new one.
To add a new attribute node with a qualified name and namespace URI, use the setAttributeNodeNS method.

Specified by:
setAttributeNode in interface Element
Parameters:
newAttr - The Attr node to add to the attribute list.
Returns:
If the newAttr attribute replaces an existing attribute, the replaced Attr node is returned, otherwise null is returned.
Throws:
DOMException - WRONG_DOCUMENT_ERR: Raised if newAttr was created from a different document than the one that created the element.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an attribute of another Element object. The DOM user must explicitly clone Attr nodes to re-use them in other elements.

setAttributeNodeNS

public Attr setAttributeNodeNS(Attr newAttr)
Equivalent to setAttributeNode(newAttr).

Specified by:
setAttributeNodeNS in interface Element
Parameters:
newAttr - The Attr node to add to the attribute list.
Returns:
If the newAttr attribute replaces an existing attribute with the same local name and namespace URI, the replaced Attr node is returned, otherwise null is returned.
See Also:
getAttributeNodeNS(java.lang.String, java.lang.String)

removeAttributeNode

public Attr removeAttributeNode(Attr oldAttr)
Description copied from interface: Element
Removes the specified attribute node. If the removed Attr has a default value it is immediately replaced. The replacing attribute has the same namespace URI and local name, as well as the original prefix, when applicable.

Specified by:
removeAttributeNode in interface Element
Parameters:
oldAttr - The Attr node to remove from the attribute list.
Returns:
The Attr node that was removed.

getElementsByTagName

public NodeList getElementsByTagName(String name)
Description copied from interface: Element
Returns a NodeList of all descendant Elements with a given tag name, in the order in which they are encountered in a preorder traversal of this Element tree.

Specified by:
getElementsByTagName in interface Element
Parameters:
name - The name of the tag to match on. The special value "*" matches all tags.
Returns:
A list of matching Element nodes.

getElementsByTagNameNS

public NodeList getElementsByTagNameNS(String namespaceURI,
                                       String localName)
Equivalent to getElementsByTagName(localName).

Specified by:
getElementsByTagNameNS in interface Element
Parameters:
namespaceURI - The namespace URI of the elements to match on. The special value "*" matches all namespaces.
localName - The local name of the elements to match on. The special value "*" matches all local names.
Returns:
A new NodeList object containing all the matched Elements.

hasAttributes

public boolean hasAttributes()
Description copied from interface: Node
Returns whether this node (if it is an element) has any attributes.

Specified by:
hasAttributes in interface Node
Returns:
true if this node has any attributes, false otherwise.

hasAttribute

public boolean hasAttribute(String name)
Description copied from interface: Element
Returns true when an attribute with a given name is specified on this element or has a default value, false otherwise.

Specified by:
hasAttribute in interface Element
Parameters:
name - The name of the attribute to look for.
Returns:
true if an attribute with the given name is specified on this element or has a default value, false otherwise.

hasAttributeNS

public boolean hasAttributeNS(String namespaceURI,
                              String localName)
Equivalent to hasAttribute(localName).

Specified by:
hasAttributeNS in interface Element
Parameters:
namespaceURI - The namespace URI of the attribute to look for.
localName - The local name of the attribute to look for.
Returns:
true if an attribute with the given local name and namespace URI is specified or has a default value on this element, false otherwise.

getLength

public int getLength()
Description copied from interface: NodeList
The number of nodes in the list. The range of valid child node indices is 0 to length-1 inclusive.

Specified by:
getLength in interface NodeList

item

public Node item(int index)
Description copied from interface: NodeList
Returns the indexth item in the collection. If index is greater than or equal to the number of nodes in the list, this returns null.

Specified by:
item in interface NodeList
Parameters:
index - Index into the collection.
Returns:
The node at the indexth position in the NodeList, or null if that is not a valid index.

getUserObject

public Object getUserObject()
Returns the Object value associated with this node.

Returns:
the user Object.
See Also:
setUserObject(java.lang.Object)

setUserObject

public void setUserObject(Object userObject)
Sets the value associated with this node.

Parameters:
userObject - the user Object.
See Also:
getUserObject()

JavaTM 2 Platform
Std. Ed. v1.4.2

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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