Node (Apache Jena)

java.lang.Object
- org.apache.jena.graph.Node

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

Node_Concrete, Node_Fluid
```
public abstract class Node
extends Object
implements Serializable
```
A Node has five subtypes: Node_Blank, Node_Anon, Node_URI, Node_Variable, and Node_ANY. Nodes are only constructed by the node factory methods, and they will attempt to re-use existing nodes with the same label if they are recent enough.

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class Node.NotLiteral
Exception thrown if a literal-access operation is attemted on a non-literal node.

Nested Classes
Modifier and Type	Class and Description
`static class`	`Node.NotLiteral` Exception thrown if a literal-access operation is attemted on a non-literal node.

Field Summary

Fields
Modifier and Type Field and Description

static Node ANY
The canonical instance of Node_ANY.

static Node NULL
Deprecated.

Fields
Modifier and Type	Field and Description
`static Node`	`ANY` The canonical instance of Node_ANY.
`static Node`	`NULL` Deprecated.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`static Node`	`create(org.apache.jena.graph.Node.NodeMaker maker, Object label)` Deprecated. Use specific `NodeFactory` functions.
`abstract boolean`	`equals(Object o)` Nodes only equal other Nodes that have equal labels.
`BlankNodeId`	`getBlankNodeId()` get the blank node id if the node is blank, otherwise die horribly
`String`	`getBlankNodeLabel()` Answer the label of this blank node or throw an UnsupportedOperationException if it's not blank.
`Object`	`getIndexingValue()` Answer the object which is the index value for this Node.
`LiteralLabel`	`getLiteral()` Answer the literal value of a literal node, or throw an UnsupportedOperationException if it's not a literal node
`RDFDatatype`	`getLiteralDatatype()` Answer the RDF datatype object of this node's literal value, if it is a literal; otherwise die horribly.
`String`	`getLiteralDatatypeURI()` Answer the data-type URI of this node's literal value, if it is a literal; otherwise die horribly.
`boolean`	`getLiteralIsXML()`
`String`	`getLiteralLanguage()` Answer the language of this node's literal value, if it is a literal; otherwise die horribly.
`String`	`getLiteralLexicalForm()` Answer the lexical form of this node's literal value, if it is a literal; otherwise die horribly.
`Object`	`getLiteralValue()` Answer the value of this node's literal value, if it is a literal; otherwise die horribly.
`String`	`getLocalName()` get the localname part of this node if it's a URI node, else die horribly
`String`	`getName()` get a variable nodes name, otherwise die horribly
`String`	`getNameSpace()` get the namespace part of this node if it's a URI node, else die horribly
`String`	`getURI()` get the URI of this node if it has one, else die horribly
`int`	`hashCode()`
`boolean`	`hasURI(String uri)` answer true iff this node is a URI node with the given URI
`boolean`	`isBlank()` Answer true iff this node is a blank node [subclasses override]
`abstract boolean`	`isConcrete()` Answer true iff this node is concrete, ie not variable, ie URI, blank, or literal.
`boolean`	`isLiteral()` Answer true iff this node is a literal node [subclasses override]
`boolean`	`isURI()` Answer true iff this node is a URI node [subclasses override]
`boolean`	`isVariable()` Answer true iff this node is a variable node - subclasses override
`boolean`	`matches(Node other)` Answer true iff this node accepts the other one as a match.
`boolean`	`sameValueAs(Object o)` Test that two nodes are semantically equivalent.
`String`	`toString()` Answer a human-readable representation of this Node.
`String`	`toString(boolean quoting)` Answer a human-readable representation of this Node where literals are quoted according to `quoting` but URIs are not compressed.
`String`	`toString(PrefixMapping pm)` Answer a human-readable representation of the Node, quoting literals and compressing URIs.
`String`	`toString(PrefixMapping pm, boolean quoting)` Answer a human readable representation of this Node, quoting literals if specified, and compressing URIs using the prefix mapping supplied.
`abstract Object`	`visitWith(NodeVisitor v)` Visit a Node and dispatch on it to the appropriate method from the NodeVisitor `v`.

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - ANY
```
public static final Node ANY
```
    The canonical instance of Node_ANY. No other instances are required.
  - NULL
```
@Deprecated
public static final Node NULL
```
    Deprecated.
    
    The canonical NULL. It appears here so that revised definitions [eg as a bnode] that require the cache-and-maker system will work; the NodeMaker constants should be non-null at this point.
- Method Detail
  - visitWith
```
public abstract Object visitWith(NodeVisitor v)
```
    Visit a Node and dispatch on it to the appropriate method from the NodeVisitor v.
    
    Parameters:
    
    v - the visitor to apply to the node
    
    Returns:
    
    the value returned by the applied method
  - isConcrete
```
public abstract boolean isConcrete()
```
    Answer true iff this node is concrete, ie not variable, ie URI, blank, or literal.
  - isLiteral
```
public boolean isLiteral()
```
    Answer true iff this node is a literal node [subclasses override]
  - isBlank
```
public boolean isBlank()
```
    Answer true iff this node is a blank node [subclasses override]
  - isURI
```
public boolean isURI()
```
    Answer true iff this node is a URI node [subclasses override]
  - isVariable
```
public boolean isVariable()
```
    Answer true iff this node is a variable node - subclasses override
  - getBlankNodeId
```
public BlankNodeId getBlankNodeId()
```
    get the blank node id if the node is blank, otherwise die horribly
  - getBlankNodeLabel
```
public String getBlankNodeLabel()
```
    Answer the label of this blank node or throw an UnsupportedOperationException if it's not blank.
  - getLiteral
```
public LiteralLabel getLiteral()
```
    Answer the literal value of a literal node, or throw an UnsupportedOperationException if it's not a literal node
  - getLiteralValue
```
public Object getLiteralValue()
```
    Answer the value of this node's literal value, if it is a literal; otherwise die horribly.
  - getLiteralLexicalForm
```
public String getLiteralLexicalForm()
```
    Answer the lexical form of this node's literal value, if it is a literal; otherwise die horribly.
  - getLiteralLanguage
```
public String getLiteralLanguage()
```
    Answer the language of this node's literal value, if it is a literal; otherwise die horribly.
  - getLiteralDatatypeURI
```
public String getLiteralDatatypeURI()
```
    Answer the data-type URI of this node's literal value, if it is a literal; otherwise die horribly.
  - getLiteralDatatype
```
public RDFDatatype getLiteralDatatype()
```
    Answer the RDF datatype object of this node's literal value, if it is a literal; otherwise die horribly.
  - getLiteralIsXML
```
public boolean getLiteralIsXML()
```
  - getIndexingValue
```
public Object getIndexingValue()
```
    Answer the object which is the index value for this Node. The default is this Node itself; overridden in Node_Literal for literal indexing purposes. Only concrete nodes should use this method.
  - getURI
```
public String getURI()
```
    get the URI of this node if it has one, else die horribly
  - getNameSpace
```
public String getNameSpace()
```
    get the namespace part of this node if it's a URI node, else die horribly
  - getLocalName
```
public String getLocalName()
```
    get the localname part of this node if it's a URI node, else die horribly
  - getName
```
public String getName()
```
    get a variable nodes name, otherwise die horribly
  - hasURI
```
public boolean hasURI(String uri)
```
    answer true iff this node is a URI node with the given URI
  - create
```
@Deprecated
public static Node create(org.apache.jena.graph.Node.NodeMaker maker,
                                      Object label)
```
    Deprecated. Use specific NodeFactory functions.
    
    We object strongly to null labels: for example, they make .equals flaky.
  - equals
```
public abstract boolean equals(Object o)
```
    Nodes only equal other Nodes that have equal labels.
    
    Overrides:
    
    equals in class Object
  - sameValueAs
```
public boolean sameValueAs(Object o)
```
    Test that two nodes are semantically equivalent. In some cases this may be the same as equals, in others equals is stricter. For example, two xsd:int literals with the same value but different language tag are semantically equivalent but distinguished by the java equality function in order to support round-tripping.
    Default implementation is to use equals, subclasses should override this.
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - matches
```
public boolean matches(Node other)
```
    Answer true iff this node accepts the other one as a match. The default is an equality test; it is over-ridden in subclasses to provide the appropriate semantics for literals, ANY, and variables.
    
    Parameters:
    
    other - a node to test for matching
    
    Returns:
    
    true iff this node accepts the other as a match
  - toString
```
public String toString()
```
    Answer a human-readable representation of this Node. It will not compress URIs, nor quote literals (because at the moment too many places use toString() for something machine-oriented).
    
    Overrides:
    
    toString in class Object
  - toString
```
public String toString(boolean quoting)
```
    Answer a human-readable representation of this Node where literals are quoted according to quoting but URIs are not compressed.
  - toString
```
public String toString(PrefixMapping pm)
```
    Answer a human-readable representation of the Node, quoting literals and compressing URIs.
  - toString
```
public String toString(PrefixMapping pm,
                       boolean quoting)
```
    Answer a human readable representation of this Node, quoting literals if specified, and compressing URIs using the prefix mapping supplied.

Class Node

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ANY

NULL

Method Detail

visitWith

isConcrete

isLiteral

isBlank

isURI

isVariable

getBlankNodeId

getBlankNodeLabel

getLiteral

getLiteralValue

getLiteralLexicalForm

getLiteralLanguage

getLiteralDatatypeURI

getLiteralDatatype

getLiteralIsXML

getIndexingValue

getURI

getNameSpace

getLocalName

getName

hasURI

create

equals

sameValueAs

hashCode

matches

toString

toString

toString

toString