ExprNode (Apache Jena ARQ)

java.lang.Object
- com.hp.hpl.jena.sparql.expr.ExprNode

All Implemented Interfaces:

Expr

Direct Known Subclasses:

ExprAggregator, ExprFunction, ExprVar, NodeValue
```
public abstract class ExprNode
extends Object
implements Expr
```
A node that is a constraint expression that can be evaluated An Expr is already a Constraint - ExprNode is the base implementation of all Expr classes that provides the Constraint machinary.

Field Summary
- Fields inherited from interface com.hp.hpl.jena.sparql.expr.Expr
  CMP_EQUAL, CMP_GREATER, CMP_INDETERMINATE, CMP_LESS, CMP_UNEQUAL

Constructor Summary

Constructors
Constructor and Description

ExprNode()

Constructors
Constructor and Description
`ExprNode()`

Method Summary

Methods
Modifier and Type	Method and Description
`abstract Expr`	`applyNodeTransform(NodeTransform transform)` Rewrite, applying a node->node transformation
`Var`	`asVar()` Convert to a Var variable.
`Expr`	`copySubstitute(Binding binding)` Deep copy with substitution
`abstract Expr`	`copySubstitute(Binding binding, boolean foldConstants)`
`Expr`	`deepCopy()` Deep copy
`abstract boolean`	`equals(Object other)`
`abstract NodeValue`	`eval(Binding binding, FunctionEnv env)` Evaluate this expression against the binding
`NodeValue`	`getConstant()` NodeValue constant (returns null if not a constant)
`Expr`	`getExpr()`
`ExprVar`	`getExprVar()` Variable (or null)
`ExprFunction`	`getFunction()` Get the function (returns null if not a function)
`Op`	`getGraphPattern()`
`String`	`getVarName()` Variable name (returns null if not a variable)
`Set<String>`	`getVarNamesMentioned()`
`Set<Var>`	`getVarsMentioned()` Variables used by this expression - excludes variables scoped to (NOT)EXISTS
`abstract int`	`hashCode()`
`boolean`	`isConstant()` Answer whether this is a constant expression - false includes "don't know" No constant folding so "false" from an expression that evaluates to a constant
`boolean`	`isExpr()`
`boolean`	`isFunction()` Answer wether this is a function.
`boolean`	`isGraphPattern()`
`boolean`	`isSatisfied(Binding binding, FunctionEnv funcEnv)` Test whether a Constraint is satisfied, given a set of bindings Includes error propagtion and Effective Boolean Value rules.
`boolean`	`isVariable()` Answer whether this is a variable (in which case getVarName and getNodeVar can be called)
`String`	`toString()`
`void`	`varNamesMentioned(Collection<String> acc)`
`void`	`varsMentioned(Collection<Var> acc)` Variables used by this expression - excludes variables scoped to (NOT)EXISTS

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

Methods inherited from interface com.hp.hpl.jena.sparql.expr.Expr
visit

- Constructor Detail
  - ExprNode
```
public ExprNode()
```
- Method Detail
  - isSatisfied
```
public boolean isSatisfied(Binding binding,
                  FunctionEnv funcEnv)
```
    Description copied from interface: Expr
    
    Test whether a Constraint is satisfied, given a set of bindings Includes error propagtion and Effective Boolean Value rules.
    
    Specified by:
    
    isSatisfied in interface Expr
    
    Parameters:
    binding - The bindings
    funcEnv - FunctionEnv
    
    Returns:
    true or false
  - isExpr
```
public boolean isExpr()
```
  - getExpr
```
public final Expr getExpr()
```
  - eval
```
public abstract NodeValue eval(Binding binding,
             FunctionEnv env)
```
    Description copied from interface: Expr
    
    Evaluate this expression against the binding
    
    Specified by:
    
    eval in interface Expr
  - getVarsMentioned
```
public Set<Var> getVarsMentioned()
```
    Description copied from interface: Expr
    
    Variables used by this expression - excludes variables scoped to (NOT)EXISTS
    
    Specified by:
    
    getVarsMentioned in interface Expr
  - varsMentioned
```
public void varsMentioned(Collection<Var> acc)
```
    Description copied from interface: Expr
    
    Variables used by this expression - excludes variables scoped to (NOT)EXISTS
    
    Specified by:
    
    varsMentioned in interface Expr
  - getVarNamesMentioned
```
public Set<String> getVarNamesMentioned()
```
  - varNamesMentioned
```
public void varNamesMentioned(Collection<String> acc)
```
  - hashCode
```
public abstract int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public abstract boolean equals(Object other)
```
    Overrides:
    
    equals in class Object
  - copySubstitute
```
public final Expr copySubstitute(Binding binding)
```
    Description copied from interface: Expr
    
    Deep copy with substitution
    
    Specified by:
    
    copySubstitute in interface Expr
  - deepCopy
```
public final Expr deepCopy()
```
    Description copied from interface: Expr
    
    Deep copy
    
    Specified by:
    
    deepCopy in interface Expr
  - copySubstitute
```
public abstract Expr copySubstitute(Binding binding,
                  boolean foldConstants)
```
    Specified by:
    
    copySubstitute in interface Expr
  - applyNodeTransform
```
public abstract Expr applyNodeTransform(NodeTransform transform)
```
    Description copied from interface: Expr
    
    Rewrite, applying a node->node transformation
    
    Specified by:
    
    applyNodeTransform in interface Expr
  - isVariable
```
public boolean isVariable()
```
    Description copied from interface: Expr
    
    Answer whether this is a variable (in which case getVarName and getNodeVar can be called)
    
    Specified by:
    
    isVariable in interface Expr
  - getVarName
```
public String getVarName()
```
    Description copied from interface: Expr
    
    Variable name (returns null if not a variable)
    
    Specified by:
    
    getVarName in interface Expr
  - getExprVar
```
public ExprVar getExprVar()
```
    Description copied from interface: Expr
    
    Variable (or null)
    
    Specified by:
    
    getExprVar in interface Expr
  - asVar
```
public Var asVar()
```
    Description copied from interface: Expr
    
    Convert to a Var variable.
    
    Specified by:
    
    asVar in interface Expr
  - isConstant
```
public boolean isConstant()
```
    Description copied from interface: Expr
    
    Answer whether this is a constant expression - false includes "don't know" No constant folding so "false" from an expression that evaluates to a constant
    
    Specified by:
    
    isConstant in interface Expr
  - getConstant
```
public NodeValue getConstant()
```
    Description copied from interface: Expr
    
    NodeValue constant (returns null if not a constant)
    
    Specified by:
    
    getConstant in interface Expr
  - isFunction
```
public boolean isFunction()
```
    Description copied from interface: Expr
    
    Answer wether this is a function.
    
    Specified by:
    
    isFunction in interface Expr
  - getFunction
```
public ExprFunction getFunction()
```
    Description copied from interface: Expr
    
    Get the function (returns null if not a function)
    
    Specified by:
    
    getFunction in interface Expr
  - isGraphPattern
```
public boolean isGraphPattern()
```
  - getGraphPattern
```
public Op getGraphPattern()
```
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class ExprNode

Field Summary

Fields inherited from interface com.hp.hpl.jena.sparql.expr.Expr

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface com.hp.hpl.jena.sparql.expr.Expr

Constructor Detail

ExprNode

Method Detail

isSatisfied

isExpr

getExpr

eval

getVarsMentioned

varsMentioned

getVarNamesMentioned

varNamesMentioned

hashCode

equals

copySubstitute

deepCopy

copySubstitute

applyNodeTransform

isVariable

getVarName

getExprVar

asVar

isConstant

getConstant

isFunction

getFunction

isGraphPattern

getGraphPattern

toString