Module org.eclipse.persistence.core

Package org.eclipse.persistence.internal.expressions

Class FromSubSelectExpression

java.lang.Object

org.eclipse.persistence.expressions.Expression

org.eclipse.persistence.internal.expressions.BaseExpression

org.eclipse.persistence.internal.expressions.DataExpression

org.eclipse.persistence.internal.expressions.TableExpression

org.eclipse.persistence.internal.expressions.FromSubSelectExpression

All Implemented Interfaces:

Serializable, Cloneable

public class FromSubSelectExpression
extends TableExpression

Allow a table expression to be created on a sub-select to define a sub-select in the from clause.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected SubSelectExpression	subSelect	Allows a sub-select to be defined from clause.

Fields inherited from class org.eclipse.persistence.internal.expressions.TableExpression

table

Fields inherited from class org.eclipse.persistence.internal.expressions.DataExpression

asOfClause, derivedFields, derivedTables, hasBeenNormalized, tableAliases

Fields inherited from class org.eclipse.persistence.internal.expressions.BaseExpression

baseExpression, builder

Fields inherited from class org.eclipse.persistence.expressions.Expression

currentAlias, hashCode, lastTable, selectIfOrderedBy, shouldUseUpperCaseForIgnoreCase

Constructor Summary

Constructors

Constructor	Description
FromSubSelectExpression()
FromSubSelectExpression(SubSelectExpression subSelect)

Method Summary

Modifier and Type	Method	Description
DatabaseTable	aliasForTable(DatabaseTable table)	INTERNAL: Any table should use the sub-selects alias.
int	computeHashCode()	INTERNAL: Compute a consistent hash-code for the expression.
String	descriptionOfNodeType()	INTERNAL: Used for debug printing.
boolean	equals(Object object)	INTERNAL: Return if the expression is equal to the other.
Expression	get(String alias)	This is used by sub-selects in the from clause to define a virtual table, 'get' allows one of the sub-selected attributes to be aliased without using the field name.
SubSelectExpression	getSubSelect()
void	iterateOn(ExpressionIterator iterator)	INTERNAL: Also iterate over the sub-select if present.
Expression	normalize(ExpressionNormalizer normalizer)	INTERNAL: Normalize the expression into a printable structure.
protected void	postCopyIn(Map alreadyDone)	INTERNAL: Also copy over the sub-select if present.
Expression	rebuildOn(Expression newBase)	INTERNAL: This expression is built on a different base than the one we want.
void	setSubSelect(SubSelectExpression subSelect)
Expression	twistedForBaseAndContext(Expression newBase, Expression context, Expression oldBase)	INTERNAL: Rebuild myself against the base, with the values of parameters supplied by the context expression.
void	writeDescriptionOn(BufferedWriter writer)	INTERNAL: Used to print a debug form of the expression tree.

Methods inherited from class org.eclipse.persistence.internal.expressions.TableExpression

assignAlias, getField, getOwnedTables, getTable, isTableExpression, setTable

Methods inherited from class org.eclipse.persistence.internal.expressions.DataExpression

addDerivedField, addDerivedTable, asOf, assignAlias, clearAliases, copyCollection, existingDerivedField, existingDerivedTable, getAlias, getAliasedField, getAsOfClause, getContainingDescriptor, getDescriptor, getField, getField, getMapping, getQueryKeyOrNull, getTable, getTable, getTableAliases, hasAsOfClause, hasBeenAliased, hasBeenNormalized, hasDerivedFields, hasDerivedTables, isAttribute, isDataExpression, newDerivedField, newDerivedTable, printSQL, setHasBeenNormalized, setTableAliases, tableAliasesDescription, writeSubexpressionsTo

Methods inherited from class org.eclipse.persistence.internal.expressions.BaseExpression

getBaseExpression, getBuilder, resetPlaceHolderBuilder, setBaseExpression, shallowClone

Methods inherited from class org.eclipse.persistence.expressions.Expression

addDate, addDate, addMonths, addMonths, alias, all, all, all, all, all, all, all, all, all, all, all, all, allOf, and, any, any, any, any, any, any, any, any, any, any, any, any, anyOf, anyOf, anyOfAllowingNone, anyOfAllowingNone, as, ascending, asciiValue, assignTableAliasesStartingAt, average, between, between, between, between, between, between, between, between, between, caseConditionStatement, caseConditionStatement, caseStatement, caseStatement, cast, clone, cloneUsing, coalesce, coalesce, concat, containsAllKeyWords, containsAnyKeyWords, containsSubstring, containsSubstring, containsSubstringIgnoringCase, containsSubstringIgnoringCase, convertNodeToUseOuterJoin, convertToUseOuterJoin, copiedVersionFrom, count, create, create, createWithBaseLast, currentDate, currentDateDate, currentTime, currentTimeStamp, dateDifference, dateDifference, dateName, datePart, dateToString, decode, descending, difference, distinct, doesConform, doesConform, equal, equal, equal, equal, equal, equal, equal, equal, equal, equal, equalOuterJoin, equalOuterJoin, equalsIgnoreCase, equalsIgnoreCase, except, except, exceptAll, exceptAll, exists, existsNode, extract, extractFields, extractPrimaryKeyValues, extractValue, extractValues, extractXml, from, fromConstant, fromLiteral, get, getAllowingNull, getAsOfClauseRecursively, getClonedField, getFields, getFieldValue, getFunction, getFunction, getFunction, getFunction, getFunctionWithArguments, getLeafDescriptor, getLeafMapping, getName, getNumberVal, getOperator, getOperator, getParameter, getParameter, getParameter, getProperty, getSelectionFields, getSelectionFields, getSession, getStringVal, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThanEqual, greaterThanEqual, greaterThanEqual, greaterThanEqual, greaterThanEqual, greaterThanEqual, greaterThanEqual, greaterThanEqual, greaterThanEqual, greaterThanEqual, hashCode, hexToRaw, ifNull, in, in, in, in, in, in, in, in, in, in, in, in, index, indexOf, intersect, intersect, intersectAll, intersectAll, isClassTypeExpression, isCompoundExpression, isConstantExpression, isEmpty, isExpressionBuilder, isFieldExpression, isFragment, isFunctionExpression, isLiteralExpression, isLogicalExpression, isMapEntryExpression, isNull, isObjectExpression, isParameterExpression, isQueryKeyExpression, isRelationExpression, isSubSelectExpression, isTreatExpression, isValueExpression, join, lastDay, leftJoin, leftPad, leftPad, leftTrim, leftTrim, length, lessThan, lessThan, lessThan, lessThan, lessThan, lessThan, lessThan, lessThan, lessThan, lessThan, lessThanEqual, lessThanEqual, lessThanEqual, lessThanEqual, lessThanEqual, lessThanEqual, lessThanEqual, lessThanEqual, lessThanEqual, lessThanEqual, like, like, like, like, likeIgnoreCase, likeIgnoreCase, literal, localDate, localDateTime, localTime, locate, locate, locate, mapEntry, mapKey, maximum, minimum, monthsBetween, newTime, nextDay, noneOf, not, notBetween, notBetween, notBetween, notBetween, notBetween, notBetween, notBetween, notBetween, notBetween, notEmpty, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notExists, notIn, notIn, notIn, notIn, notIn, notIn, notIn, notIn, notIn, notIn, notIn, notIn, notLike, notLike, notLike, notLike, notNull, nullIf, nullsFirst, nullsLast, operator, or, performOperator, postfixSQL, prefixSQL, printJava, ref, regexp, regexp, registerIn, replace, replicate, replicate, resetCache, reverse, right, right, rightPad, rightPad, rightTrim, rightTrim, roundDate, selectIfOrderedBy, setLocalBase, setSelectIfOrderedBy, size, size, some, some, some, some, some, some, some, some, some, some, some, some, sql, standardDeviation, subQuery, substring, substring, substring, substring, sum, toChar, toChar, toCharacter, toDate, toLowerCase, toNumber, toString, toString, toUpperCase, toUppercaseCasedWords, translate, treat, trim, trim, truncateDate, twist, type, union, union, unionAll, unionAll, validateNode, value, value, value, value, value, value, value, value, value, value, valueFromObject, valueFromObject, variance, writeAlias, writeField, writeFields

Methods inherited from class java.lang.Object

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

Field Details

subSelect

protected SubSelectExpression subSelect

Allows a sub-select to be defined from clause.

Constructor Details

FromSubSelectExpression

public FromSubSelectExpression()

FromSubSelectExpression

public FromSubSelectExpression(SubSelectExpression subSelect)

Method Details

equals

public boolean equals(Object object)

INTERNAL: Return if the expression is equal to the other. This is used to allow dynamic expression's SQL to be cached. From sub-selects are too complex to cache, so use identity.

Overrides:

equals in class TableExpression

computeHashCode

public int computeHashCode()

INTERNAL: Compute a consistent hash-code for the expression.

Overrides:

computeHashCode in class TableExpression

descriptionOfNodeType

public String descriptionOfNodeType()

INTERNAL: Used for debug printing.

Overrides:

descriptionOfNodeType in class TableExpression

get

public Expression get(String alias)

This is used by sub-selects in the from clause to define a virtual table, 'get' allows one of the sub-selected attributes to be aliased without using the field name.

Overrides:

get in class Expression

normalize

public Expression normalize(ExpressionNormalizer normalizer)

INTERNAL: Normalize the expression into a printable structure. Any joins must be added to form a new root.

Overrides:

normalize in class TableExpression

iterateOn

public void iterateOn(ExpressionIterator iterator)

INTERNAL: Also iterate over the sub-select if present.

Overrides:

iterateOn in class DataExpression

postCopyIn

protected void postCopyIn(Map alreadyDone)

INTERNAL: Also copy over the sub-select if present.

Overrides:

postCopyIn in class DataExpression

rebuildOn

public Expression rebuildOn(Expression newBase)

INTERNAL: This expression is built on a different base than the one we want. Rebuild it and return the root of the new tree

Overrides:

rebuildOn in class TableExpression

See Also:

• Expression.cloneUsing(Expression newBase)

twistedForBaseAndContext

public Expression twistedForBaseAndContext(Expression newBase,
 Expression context,
 Expression oldBase)

INTERNAL: Rebuild myself against the base, with the values of parameters supplied by the context expression. This is used for transforming a standalone expression (e.g. the join criteria of a mapping) into part of some larger expression. You normally would not call this directly, instead calling twist See the comment there for more details"

Overrides:

twistedForBaseAndContext in class TableExpression

writeDescriptionOn

public void writeDescriptionOn(BufferedWriter writer)
                        throws IOException

INTERNAL: Used to print a debug form of the expression tree.

Overrides:

writeDescriptionOn in class TableExpression

Throws:

IOException

aliasForTable

public DatabaseTable aliasForTable(DatabaseTable table)

INTERNAL: Any table should use the sub-selects alias.

Overrides:

aliasForTable in class DataExpression

getSubSelect

public SubSelectExpression getSubSelect()

setSubSelect

public void setSubSelect(SubSelectExpression subSelect)