com.bigdata.rdf.sparql.ast

Class ValueExpressionNode

java.lang.Object

com.bigdata.bop.CoreBaseBOp

com.bigdata.bop.ModifiableBOpBase

com.bigdata.rdf.sparql.ast.ASTBase

com.bigdata.rdf.sparql.ast.ValueExpressionNode

All Implemented Interfaces:

BOp, IValueExpressionNode, IPropertySet, Serializable, Cloneable

Direct Known Subclasses:

FunctionNode, TermNode

public abstract class ValueExpressionNode
extends ASTBase
implements IValueExpressionNode

AST node for value expressions.

Version:

$Id$

Author:

Bryan Thompson

See Also:

Serialized Form

Field Summary

Fields inherited from class com.bigdata.bop.CoreBaseBOp

DEFAULT_INITIAL_CAPACITY

Fields inherited from interface com.bigdata.bop.BOp

NOANNS, NOARGS

Constructor Summary

Constructors

Constructor and Description
ValueExpressionNode(BOp[] args, Map<String,Object> anns) Required shallow copy constructor.
ValueExpressionNode(IValueExpression<? extends IV> ve) Deprecated. This was just for compatibility with SOp2ASTUtility. It is only used by the test suite now. It should be removed now that we are done with the SPARQL to AST direct translation.
ValueExpressionNode(ValueExpressionNode op) Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).

Method Summary

Methods

Modifier and Type	Method and Description
IValueExpression<? extends IV>	getRequiredValueExpression() Return the cached IValueExpressionNode if it exists on the node.
IValueExpression<? extends IV>	getValueExpression() Return the cached IValueExpression if it exists on the node, otherwise return null.
void	invalidate() Invalidate the cached value.
boolean	isConstant() Return true iff this is a ConstantNode.
boolean	isFunction() Return true iff this is a FunctionNode.
boolean	isVariable() Return true iff this is a VarNode.
void	setValueExpression(IValueExpression<? extends IV> ve) Called by AST2BOpUtility to populate the value expression nodes with value expressions.
String	toShortString() General contract is a short (non-recursive) representation of the BOp.

Methods inherited from class com.bigdata.rdf.sparql.ast.ASTBase

addExplainHint, getExplainHints, getQueryHint, getQueryHint, getQueryHintAsBoolean, getQueryHintAsBoolean, getQueryHintAsInteger, getQueryHints, replaceAllWith, setQueryHint, setQueryHints

Methods inherited from class com.bigdata.bop.ModifiableBOpBase

addArg, addArg, addArgIfAbsent, annotations, annotationsEqual, argIterator, args, arity, clearProperty, copyAll, get, getProperty, indexOf, removeArg, replaceWith, setArg, setArgs, setId, setProperty, setUnboundProperty, toArray, toArray

Methods inherited from class com.bigdata.bop.CoreBaseBOp

annotationsEqual, annotationsToString, annotationsToString, annotationValueToString, checkArgs, clone, equals, getEvaluationContext, getId, getProperty, getRequiredProperty, hashCode, indent, isController, mutation, shortenName, toString, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.bigdata.rdf.sparql.ast.IValueExpressionNode

toString

Constructor Detail

ValueExpressionNode

@Deprecated
public ValueExpressionNode(IValueExpression<? extends IV> ve)

Deprecated. This was just for compatibility with SOp2ASTUtility. It is only used by the test suite now. It should be removed now that we are done with the SPARQL to AST direct translation.

ValueExpressionNode

public ValueExpressionNode(ValueExpressionNode op)

Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).

ValueExpressionNode

public ValueExpressionNode(BOp[] args,
                   Map<String,Object> anns)

Required shallow copy constructor.

Method Detail

isConstant

public final boolean isConstant()

Return true iff this is a ConstantNode.

isVariable

public final boolean isVariable()

Return true iff this is a VarNode.

isFunction

public final boolean isFunction()

Return true iff this is a FunctionNode.

getRequiredValueExpression

public final IValueExpression<? extends IV> getRequiredValueExpression()

Description copied from interface: IValueExpressionNode

Return the cached IValueExpressionNode if it exists on the node.

Specified by:

getRequiredValueExpression in interface IValueExpressionNode

Returns:

The IValueExpressionNode and never null.

getValueExpression

public IValueExpression<? extends IV> getValueExpression()

Description copied from interface: IValueExpressionNode

Return the cached IValueExpression if it exists on the node, otherwise return null.

Specified by:

getValueExpression in interface IValueExpressionNode

setValueExpression

public void setValueExpression(IValueExpression<? extends IV> ve)

Called by AST2BOpUtility to populate the value expression nodes with value expressions.

Specified by:

setValueExpression in interface IValueExpressionNode

invalidate

public void invalidate()

Description copied from interface: IValueExpressionNode

Invalidate the cached value. It will be recomputed again on demand.

Specified by:

invalidate in interface IValueExpressionNode

toShortString

public String toShortString()

Description copied from class: CoreBaseBOp

General contract is a short (non-recursive) representation of the BOp.

Specified by:

toShortString in interface BOp

Overrides:

toShortString in class CoreBaseBOp