Type Parameters:

ConstantTermType - type for representing constants in triple patterns (i.e., URIs and literals)

NamedVarType - type for representing named variables in triple patterns

AnonVarType - type for representing anonymous variables in triple patterns (i.e., variables denoted by a blank node)

All Known Implementing Classes:

TriplePatternElementFactory.AnonymousVariable, TriplePatternElementFactory.ConstantRDFTerm, TriplePatternElementFactory.NamedVariable, TriplePatternElementFactory.SpecificVariable, TriplePatternElementFactory.UnspecifiedVariable, TriplePatternElementFactory.Variable
```
public interface ITriplePatternElement<ConstantTermType,NamedVarType,AnonVarType>
```
Represents an element of a triple pattern (i.e., subject, predicate, object).

Author:

Olaf Hartig

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`AnonVarType`	`asAnonymousVariable()`	Returns a representation of this element as a blank node (assuming it is a specific, but non-named variable).
`ConstantTermType`	`asConstantTerm()`	Returns a representation of this element as a constant RDF term (i.e., a URI or a literal).
`NamedVarType`	`asNamedVariable()`	Returns a representation of this element as a named variable (assuming it is a specific variable that has a name).
`boolean`	`isAnonymousVariable()`	Returns true if this element is a specific variable that does not have a name (i.e., it is denoted by a blank node), and false if either it is not a specific variable or it is a specific variable that has a name.
`boolean`	`isNamedVariable()`	Returns true if this element is a specific variable that has a name (i.e., it is denoted by a string that begins with a question mark), and false if either it is not a specific variable or it is a specific variable that is denoted by a blank node.
`boolean`	`isSpecificVariable()`	Returns true if this element is a specific variable, and false if either it is not a variable (but a URI or literal) or it is some variable that is not specified.
`boolean`	`isVariable()`	Returns true if this element is a variable (specific or unspecified).

- Method Detail
  - isVariable
```
boolean isVariable()
```
    Returns true if this element is a variable (specific or unspecified).
    
    Returns:
  - isSpecificVariable
```
boolean isSpecificVariable()
```
    Returns true if this element is a specific variable, and false if either it is not a variable (but a URI or literal) or it is some variable that is not specified. The latter (unspecified variables) is possible because when a client requests a triple pattern fragment, it may omit triple pattern related parameters.
    
    Returns:
  - isNamedVariable
```
boolean isNamedVariable()
```
    Returns true if this element is a specific variable that has a name (i.e., it is denoted by a string that begins with a question mark), and false if either it is not a specific variable or it is a specific variable that is denoted by a blank node. If this element is a specific variable that has a name (that is, this method returns true), the named variable can be obtained by the method asNamedVariable().
    
    Returns:
  - asNamedVariable
```
NamedVarType asNamedVariable()
                      throws UnsupportedOperationException
```
    Returns a representation of this element as a named variable (assuming it is a specific variable that has a name).
    
    Returns:
    
    Throws:
    
    UnsupportedOperationException - If this element is not a specific variable that has a name (i.e., if isNamedVariable() returns false).
  - isAnonymousVariable
```
boolean isAnonymousVariable()
```
    Returns true if this element is a specific variable that does not have a name (i.e., it is denoted by a blank node), and false if either it is not a specific variable or it is a specific variable that has a name. If this element is a specific variable denoted by a blank node (that is, this method returns true), the blank node can be obtained by the method asAnonymousVariable().
    
    Returns:
  - asAnonymousVariable
```
AnonVarType asAnonymousVariable()
                         throws UnsupportedOperationException
```
    Returns a representation of this element as a blank node (assuming it is a specific, but non-named variable).
    
    Returns:
    
    Throws:
    
    UnsupportedOperationException - If this element is not a specific anonymous variable (i.e., if isAnonymousVariable() returns false).
  - asConstantTerm
```
ConstantTermType asConstantTerm()
                         throws UnsupportedOperationException
```
    Returns a representation of this element as a constant RDF term (i.e., a URI or a literal).
    
    Returns:
    
    Throws:
    
    UnsupportedOperationException - If this element is not a constant RDF term but a variable (i.e., if isVariable() returns true).

Interface ITriplePatternElement<ConstantTermType,​NamedVarType,​AnonVarType>

Method Summary

Method Detail

isVariable

isSpecificVariable

isNamedVariable

asNamedVariable

isAnonymousVariable

asAnonymousVariable

asConstantTerm

Interface ITriplePatternElement<ConstantTermType,NamedVarType,AnonVarType>