org.apache.openjpa.persistence.query
Class NavigationPath

java.lang.Object
  org.apache.openjpa.persistence.query.AbstractVisitable
      org.apache.openjpa.persistence.query.ExpressionImpl
          org.apache.openjpa.persistence.query.AbstractPath
              org.apache.openjpa.persistence.query.AbstractDomainObject
                  org.apache.openjpa.persistence.query.NavigationPath

All Implemented Interfaces:

Serializable, DomainObject, Expression, OrderByItem, PathExpression, PredicateOperand, QueryDefinition, SelectItem, Subquery, Visitable

 class NavigationPath
extends AbstractDomainObject
implements PathExpression

Represents a path resulted by navigation.

Author:

Pinaki Poddar

Field Summary

Fields inherited from class org.apache.openjpa.persistence.query.AbstractPath

_operator, _owner, _parent, _part2

Fields inherited from class org.apache.openjpa.persistence.query.AbstractVisitable

CLOSE_BRACE, COMMA, EMPTY, OPEN_BRACE, SPACE

Constructor Summary

protected

NavigationPath(QueryDefinitionImpl owner, AbstractPath parent, String attr)

Method Summary

String	asExpression(AliasContext ctx) Get a JPQL fragment as used in WHERE clause.
String	asJoinable(AliasContext ctx) A navigation path is joinable only when it represents domain of a subquery.
String	asProjection(AliasContext ctx) Gets the string representation in SELECT projection.
String	getAliasHint(AliasContext ctx) Gets the hint to be used while creating alias.
String	getLastSegment() Gets the last segment of this path.
String	toString()

Methods inherited from class org.apache.openjpa.persistence.query.AbstractDomainObject

addRoot, addSubqueryRoot, all, any, coalesce, coalesce, coalesce, coalesce, currentDate, currentTime, currentTimestamp, entry, exists, generalCase, get, groupBy, groupBy, having, index, join, joinFetch, key, leftJoin, leftJoinFetch, literal, literal, literal, literal, literal, literal, literal, literal, newInstance, nullif, nullif, nullif, nullif, nullif, nullif, nullif, nullLiteral, orderBy, orderBy, param, predicate, select, select, selectDistinct, selectDistinct, simpleCase, simpleCase, simpleCase, simpleCase, simpleCase, simpleCase, simpleCase, some, value, where

Methods inherited from class org.apache.openjpa.persistence.query.AbstractPath

avg, count, getOperator, getOwner, getParent, isEmpty, max, min, size, split, sum, type

Methods inherited from class org.apache.openjpa.persistence.query.ExpressionImpl

abs, asc, between, between, between, between, between, between, between, between, between, between, between, between, between, concat, concat, desc, dividedBy, dividedBy, equal, equal, equal, equal, equal, equal, equal, equal, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, in, in, in, in, in, in, isNull, length, lessEqual, lessEqual, lessEqual, lessEqual, lessEqual, lessThan, lessThan, lessThan, lessThan, lessThan, like, like, like, like, like, like, locate, locate, locate, locate, locate, locate, lower, member, minus, minus, minus, mod, mod, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, plus, plus, sqrt, substring, substring, substring, substring, substring, substring, times, times, trim, trim, trim, trim, trim, trim, upper

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.persistence.query.PathExpression

avg, count, get, isEmpty, max, min, size, sum, type

Methods inherited from interface org.apache.openjpa.persistence.query.Expression

abs, concat, concat, dividedBy, dividedBy, in, in, in, in, in, in, isNull, length, locate, locate, locate, locate, locate, locate, lower, member, minus, minus, minus, mod, mod, plus, plus, sqrt, substring, substring, substring, substring, substring, substring, times, times, trim, trim, trim, trim, trim, trim, upper

Methods inherited from interface org.apache.openjpa.persistence.query.SelectItem

asc, desc

Methods inherited from interface org.apache.openjpa.persistence.query.PredicateOperand

between, between, between, between, between, between, between, between, between, between, between, between, between, equal, equal, equal, equal, equal, equal, equal, equal, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, lessEqual, lessEqual, lessEqual, lessEqual, lessEqual, lessThan, lessThan, lessThan, lessThan, lessThan, like, like, like, like, like, like, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual

Constructor Detail

NavigationPath

protected NavigationPath(QueryDefinitionImpl owner,
                         AbstractPath parent,
                         String attr)

Method Detail

getLastSegment

public String getLastSegment()

Description copied from class: AbstractPath

Gets the last segment of this path. Concrete implementation should return a covariant type.

Overrides:

getLastSegment in class AbstractPath

getAliasHint

public String getAliasHint(AliasContext ctx)

Description copied from interface: Visitable

Gets the hint to be used while creating alias.

Specified by:

getAliasHint in interface Visitable

Overrides:

getAliasHint in class ExpressionImpl

asProjection

public String asProjection(AliasContext ctx)

Description copied from interface: Visitable

Gets the string representation in SELECT projection.

Specified by:

asProjection in interface Visitable

Overrides:

asProjection in class AbstractVisitable

asExpression

public String asExpression(AliasContext ctx)

Description copied from interface: Visitable

Get a JPQL fragment as used in WHERE clause.

Specified by:

asExpression in interface Visitable

Overrides:

asExpression in class AbstractVisitable

asJoinable

public String asJoinable(AliasContext ctx)

A navigation path is joinable only when it represents domain of a subquery.

Specified by:

asJoinable in interface Visitable

Overrides:

asJoinable in class AbstractVisitable

See Also:

QueryDefinitionImpl.addSubqueryRoot(PathExpression)

toString

public String toString()

Overrides:

toString in class Object