Package com.orientechnologies.orient.core.sql.parser

Class OTrueExpression

java.lang.Object

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

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

com.orientechnologies.orient.core.sql.parser.OTrueExpression

All Implemented Interfaces:

Node

public final class OTrueExpression
extends OBooleanExpression

Field Summary

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

FALSE, TRUE

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

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

Constructor Summary

Constructors

Constructor	Description
OTrueExpression(int id)

Method Summary

Modifier and Type	Method	Description
OBooleanExpression	copy()
boolean	evaluate(OResult currentRecord, OCommandContext ctx)
void	extractSubQueries(SubQueryCollector collector)
protected List<Object>	getExternalCalculationConditions()
List<String>	getMatchPatternInvolvedAliases()
protected int	getNumberOfExternalCalculations()
boolean	isAlwaysTrue()	returns true only if the expression does not need any further evaluation (eg.
boolean	isCacheable()
boolean	isEmpty()
boolean	needsAliases(Set<String> aliases)
boolean	refersToParent()
protected boolean	supportsBasicCalculation()
void	toGenericStatement(StringBuilder builder)
String	toString()
void	toString(Map<Object,Object> params, StringBuilder builder)
void	translateLuceneOperator()

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

conditionsCount, deserialize, deserializeFromOResult, encapsulateInAndBlock, extractRidRanges, findIndex, flatten, getIndexedFunctionConditions, getIndexKeyCondition, getIndexRidCondition, rewriteIndexChainsAsSubqueries, serialize, transformToUpdateItem

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

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

Methods inherited from class java.lang.Object

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

Constructor Details

OTrueExpression

public OTrueExpression(int id)

Method Details

evaluate

public boolean evaluate(OResult currentRecord,
 OCommandContext ctx)

Specified by:

evaluate in class OBooleanExpression

supportsBasicCalculation

protected boolean supportsBasicCalculation()

Specified by:

supportsBasicCalculation in class OBooleanExpression

Returns:

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

getNumberOfExternalCalculations

protected int getNumberOfExternalCalculations()

Specified by:

getNumberOfExternalCalculations in class OBooleanExpression

Returns:

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

getExternalCalculationConditions

protected List<Object> getExternalCalculationConditions()

Specified by:

getExternalCalculationConditions in class OBooleanExpression

Returns:

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

needsAliases

public boolean needsAliases(Set<String> aliases)

Specified by:

needsAliases in class OBooleanExpression

copy

public OBooleanExpression copy()

Specified by:

copy in class OBooleanExpression

getMatchPatternInvolvedAliases

public List<String> getMatchPatternInvolvedAliases()

Specified by:

getMatchPatternInvolvedAliases in class OBooleanExpression

translateLuceneOperator

public void translateLuceneOperator()

Overrides:

translateLuceneOperator in class OBooleanExpression

isCacheable

public boolean isCacheable()

Specified by:

isCacheable in class OBooleanExpression

toString

public String toString()

Overrides:

toString in class SimpleNode

toString

public void toString(Map<Object,Object> params,
 StringBuilder builder)

Specified by:

toString in class SimpleNode

toGenericStatement

public void toGenericStatement(StringBuilder builder)

Specified by:

toGenericStatement in class SimpleNode

isEmpty

public boolean isEmpty()

Overrides:

isEmpty in class OBooleanExpression

extractSubQueries

public void extractSubQueries(SubQueryCollector collector)

Specified by:

extractSubQueries in class OBooleanExpression

refersToParent

public boolean refersToParent()

Specified by:

refersToParent in class OBooleanExpression

isAlwaysTrue

public boolean isAlwaysTrue()

Description copied from class: OBooleanExpression

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

Overrides:

isAlwaysTrue in class OBooleanExpression

Returns: