com.orientechnologies.orient.core.sql.parser

Class OBooleanExpression

java.lang.Object

com.orientechnologies.orient.core.sql.parser.SimpleNode

com.orientechnologies.orient.core.sql.parser.OBooleanExpression

All Implemented Interfaces:

Node

Direct Known Subclasses:

OAndBlock, OBetweenCondition, OBinaryCondition, OContainsAllCondition, OContainsAnyCondition, OContainsCondition, OContainsTextCondition, OContainsValueCondition, OInCondition, OInstanceofCondition, OIsDefinedCondition, OIsNotDefinedCondition, OIsNotNullCondition, OIsNullCondition, OMatchesCondition, ONotBlock, ONotInCondition, OOrBlock, OParenthesisBlock

public abstract class OBooleanExpression
extends SimpleNode

Created by luigidellaquila on 07/11/14.

Field Summary

Fields

Modifier and Type	Field and Description
static OBooleanExpression	FALSE
static OBooleanExpression	TRUE

Fields inherited from class com.orientechnologies.orient.core.sql.parser.SimpleNode

children, firstToken, id, lastToken, parent, parser, value

Constructor Summary

Constructors

Constructor and Description
OBooleanExpression(int id)
OBooleanExpression(OrientSql p, int id)

Method Summary

Modifier and Type	Method and Description
abstract OBooleanExpression	copy()
void	deserialize(OResult fromResult)
static OBooleanExpression	deserializeFromOResult(OResult doc)
protected OAndBlock	encapsulateInAndBlock(OBooleanExpression item)
abstract boolean	evaluate(OIdentifiable currentRecord, OCommandContext ctx)
abstract boolean	evaluate(OResult currentRecord, OCommandContext ctx)
abstract void	extractSubQueries(SubQueryCollector collector)
List<OAndBlock>	flatten()
protected abstract List<Object>	getExternalCalculationConditions()
List<OBinaryCondition>	getIndexedFunctionConditions(OClass iSchemaClass, ODatabaseDocumentInternal database)
abstract List<String>	getMatchPatternInvolvedAliases()
protected abstract int	getNumberOfExternalCalculations()
boolean	isAlwaysTrue() returns true only if the expression does not need any further evaluation (eg.
abstract boolean	isCacheable()
boolean	isEmpty()
abstract boolean	needsAliases(Set<String> aliases)
abstract boolean	refersToParent()
OBooleanExpression	rewriteIndexChainsAsSubqueries(OCommandContext ctx, OClass clazz)
OResult	serialize()
protected abstract boolean	supportsBasicCalculation()
Optional<OUpdateItem>	transformToUpdateItem() returns the equivalent of current condition as an UPDATE expression with the same syntax, if possible.
void	translateLuceneOperator()

Methods inherited from class com.orientechnologies.orient.core.sql.parser.SimpleNode

childrenAccept, dump, getDatabase, getValue, jjtAccept, jjtAddChild, jjtClose, jjtGetChild, jjtGetFirstToken, jjtGetLastToken, jjtGetNumChildren, jjtGetParent, jjtGetValue, jjtOpen, jjtSetFirstToken, jjtSetLastToken, jjtSetParent, jjtSetValue, toString, toString, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TRUE

public static final OBooleanExpression TRUE

FALSE

public static final OBooleanExpression FALSE

Constructor Detail

OBooleanExpression

public OBooleanExpression(int id)

OBooleanExpression

public OBooleanExpression(OrientSql p,
                          int id)

Method Detail

evaluate

public abstract boolean evaluate(OIdentifiable currentRecord,
                                 OCommandContext ctx)

evaluate

public abstract boolean evaluate(OResult currentRecord,
                                 OCommandContext ctx)

supportsBasicCalculation

protected abstract boolean supportsBasicCalculation()

Returns:

true if this expression can be calculated in plain Java, false otherwise (eg. LUCENE operator)

getNumberOfExternalCalculations

protected abstract int getNumberOfExternalCalculations()

Returns:

the number of sub-expressions that have to be calculated using an external engine (eg. LUCENE)

getExternalCalculationConditions

protected abstract List<Object> getExternalCalculationConditions()

Returns:

the sub-expressions that have to be calculated using an external engine (eg. LUCENE)

getIndexedFunctionConditions

public List<OBinaryCondition> getIndexedFunctionConditions(OClass iSchemaClass,
                                                           ODatabaseDocumentInternal database)

flatten

public List<OAndBlock> flatten()

encapsulateInAndBlock

protected OAndBlock encapsulateInAndBlock(OBooleanExpression item)

needsAliases

public abstract boolean needsAliases(Set<String> aliases)

copy

public abstract OBooleanExpression copy()

Overrides:

copy in class SimpleNode

isEmpty

public boolean isEmpty()

extractSubQueries

public abstract void extractSubQueries(SubQueryCollector collector)

refersToParent

public abstract boolean refersToParent()

transformToUpdateItem

public Optional<OUpdateItem> transformToUpdateItem()

returns the equivalent of current condition as an UPDATE expression with the same syntax, if possible.

Eg. name = 3 can be considered a condition or an assignment. This method transforms the condition in an assignment. This is used mainly for UPSERT operations.

Returns:

the equivalent of current condition as an UPDATE expression with the same syntax, if possible.

getMatchPatternInvolvedAliases

public abstract List<String> getMatchPatternInvolvedAliases()

translateLuceneOperator

public void translateLuceneOperator()

deserializeFromOResult

public static OBooleanExpression deserializeFromOResult(OResult doc)

serialize

public OResult serialize()

deserialize

public void deserialize(OResult fromResult)

isCacheable

public abstract boolean isCacheable()

rewriteIndexChainsAsSubqueries

public OBooleanExpression rewriteIndexChainsAsSubqueries(OCommandContext ctx,
                                                         OClass clazz)

isAlwaysTrue

public boolean isAlwaysTrue()

returns true only if the expression does not need any further evaluation (eg. "true") and always evaluates to true. It is supposed to be used as and optimization, and is allowed to return false negatives

Returns: