org.joda.beans.query
Class ChainedBeanQuery<P>

java.lang.Object
  org.joda.beans.query.ChainedBeanQuery<P>

Type Parameters:

P - the type of the result of the query

All Implemented Interfaces:

BeanQuery<P>

public final class ChainedBeanQuery<P>
extends Object
implements BeanQuery<P>

A chained query, that allows two or more queries to be joined.

For example, consider a structure where class A has a property b of type B, and class B has a property c of type C. The compound query allows property c to be accessed directly from an instance of A.

of

public static <P> ChainedBeanQuery<P> of(BeanQuery<? extends Bean> prop1,
                                         BeanQuery<P> prop2)

Obtains a chained query from two other queries.

MetaProperty implements BeanQuery, so typically the parameters are in fact meta-properties.

Type Parameters:

P - the result type

Parameters:

prop1 - the first query, not null

prop2 - the second query, not null

Returns:

the compound query, not null

Throws:

IllegalArgumentException - if unable to obtain the meta-bean

of

public static <P> ChainedBeanQuery<P> of(BeanQuery<? extends Bean> prop1,
                                         BeanQuery<? extends Bean> prop2,
                                         BeanQuery<P> prop3)

Obtains a chained query from three queries.

MetaProperty implements BeanQuery, so typically the parameters are in fact meta-properties.

Type Parameters:

P - the result type

Parameters:

prop1 - the first query, not null

prop2 - the second query, not null

prop3 - the third query, not null

Returns:

the compound query, not null

Throws:

IllegalArgumentException - if unable to obtain the meta-bean

of

public static <P> ChainedBeanQuery<P> of(BeanQuery<? extends Bean> prop1,
                                         BeanQuery<? extends Bean> prop2,
                                         BeanQuery<? extends Bean> prop3,
                                         BeanQuery<P> prop4)

Obtains a chained query from four queries.

MetaProperty implements BeanQuery, so typically the parameters are in fact meta-properties.

Type Parameters:

P - the result type

Parameters:

prop1 - the first query, not null

prop2 - the second query, not null

prop3 - the third query, not null

prop4 - the fourth query, not null

Returns:

the compound query, not null

Throws:

IllegalArgumentException - if unable to obtain the meta-bean

getChain

public List<BeanQuery<?>> getChain()

Gets the list of queries being chained.

MetaProperty implements BeanQuery, so typically the chain is formed from meta-properties.

Returns:

the list of all meta-properties being chained, not null

get

public P get(Bean bean)

Description copied from interface: BeanQuery

Queries a value from the specified bean.

This returns a value of some kind derived from the specified bean. This might be a property value or some other derived value.

Specified by:

get in interface BeanQuery<P>

Parameters:

bean - the bean to query, not null

Returns:

the value derived from the specified bean, may be null

toString

public String toString()

Overrides:

toString in class Object