Package net.sf.basedb.core.query

Class AnyToAnyRestriction

java.lang.Object

net.sf.basedb.core.query.AnyToAnyRestriction

All Implemented Interfaces:

QueryElement, Restriction

public class AnyToAnyRestriction
extends Object
implements Restriction

Expression that can be used to filter on the existence or non-existence of a named any-to-any link.

Since:

3.6

Author:

nicklas

Field Summary

Fields

Modifier and Type	Field	Description
private final String	alias
private final boolean	hasLink
private final EntityQuery	linkedQuery
private final Restriction	linkedRestriction
private final Item	linkedTo
private final String	linkName
private String	parameterName

Constructor Summary

Constructors

Modifier	Constructor	Description
private	AnyToAnyRestriction(String alias, String linkName, Item linkedTo, boolean hasLink, EntityQuery linkedQuery)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object other)	This expression is equal to another AnyToAnyRestriction if their named link, 'hasLink' and subquery restriction are the same.
static AnyToAnyRestriction	exists(String alias, String linkName, Item linkedTo, EntityQuery linkedQuery)	Create a restriction that restrict a query to return items that has a linked item with the given link name.
Collection<? extends QueryElement>	getChildren()	Get the children of this query element or null if it has no children.
int	hashCode()
static AnyToAnyRestriction	missing(String alias, String linkName, Item linkedTo, EntityQuery linkedQuery)	Create a restriction that restrict a query to return items that is missing a linked item with the given link name.
String	toQl(Query query, DbControl dc)	Create a query language string of the query element.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

alias

private final String alias

linkName

private final String linkName

linkedTo

private final Item linkedTo

hasLink

private final boolean hasLink

linkedQuery

private final EntityQuery linkedQuery

linkedRestriction

private final Restriction linkedRestriction

parameterName

private String parameterName

Constructor Details

AnyToAnyRestriction

private AnyToAnyRestriction(String alias,
 String linkName,
 Item linkedTo,
 boolean hasLink,
 EntityQuery linkedQuery)

Method Details

exists

public static AnyToAnyRestriction exists(String alias,
 String linkName,
 Item linkedTo,
 EntityQuery linkedQuery)

Create a restriction that restrict a query to return items that has a linked item with the given link name.

Parameters:

alias - Alias to resolve the link against, use null to resolve the link agains the root entity

linkName - The name of the link (required)

linkedTo - The type of the linked item (optional)

linkedQuery - An optional query that the linked items must match

missing

public static AnyToAnyRestriction missing(String alias,
 String linkName,
 Item linkedTo,
 EntityQuery linkedQuery)

Create a restriction that restrict a query to return items that is missing a linked item with the given link name.

Parameters:

alias - Alias to resolve the link against, use null to resolve the link agains the root entity

linkName - The name of the link (required)

linkedTo - The type of the linked item (optional)

linkedQuery - An optional query that the linked items must not match

toQl

public String toQl(Query query,
 DbControl dc)

Description copied from interface: QueryElement

Create a query language string of the query element. Use the Query.getQueryType() method to find out which query language is wanted in case the element requires different syntax for different languages.

Specified by:

toQl in interface QueryElement

Parameters:

query - The query that is about to be executed

dc - The DbControl object used to execute the query

getChildren

public Collection<? extends QueryElement> getChildren()

Description copied from interface: QueryElement

Get the children of this query element or null if it has no children. For example the AddExpression has two children, the expression beeing added.

Specified by:

getChildren in interface QueryElement

Returns:

A collection or null

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object other)

This expression is equal to another AnyToAnyRestriction if their named link, 'hasLink' and subquery restriction are the same.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object