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Java Source Code / Java Documentation » Database ORM » db ojb » org.odmg

Source Cross Reference Class Diagram Java Document (Java Doc)

org.odmg .DCollection

DCollection
public interface DCollection extends java.util.Collection(Code)
	The base interface for all ODMG collections. The ODMG collections are based on JavaSoft�s collection interfaces. All of the operations defined by the JavaSoft `Collection` interface are supported by an ODMG implementation of `DCollection`; the exception `UnsupportedOperationException` is not thrown when a call is made to any of the `Collection` methods. `DCollection` contains methods used to perform queries on the collection. The OQL query predicate is given as a string with the syntax of the `where` clause of OQL. The predefined OQL variable `this` is used inside the predicate to denote the current element of the collection. author: David Jordan (as Java Editor of the Object Data Management Group) version: ODMG 3.0

Method Summary
public boolean	existsElement(String predicate) Determines whether there is an element of the collection that evaluates to true for the predicate.
public DCollection	query(String predicate) Evaluate the boolean query predicate for each element of the collection and return a new collection that contains each element that evaluated to true.
public java.util.Iterator	select(String predicate) Access all of the elements of the collection that evaluate to true for the provided query predicate.
public Object	selectElement(String predicate) Selects the single element of the collection for which the provided OQL query predicate is true. Parameters: predicate - An OQL boolean query predicate.

Method Detail

existsElement
public boolean existsElement(String predicate) throws QueryInvalidException(Code)
	Determines whether there is an element of the collection that evaluates to true for the predicate. Parameters: predicate - An OQL boolean query predicate. True if there is an element of the collection that evaluates to truefor the predicate, otherwise false. exception: QueryInvalidException - The query predicate is invalid.

query
public DCollection query(String predicate) throws QueryInvalidException(Code)
	Evaluate the boolean query predicate for each element of the collection and return a new collection that contains each element that evaluated to true. Parameters: predicate - An OQL boolean query predicate. A new collection containing the elements that evaluated true for the predicate. exception: QueryInvalidException - The query predicate is invalid.

select
public java.util.Iterator select(String predicate) throws QueryInvalidException(Code)
	Access all of the elements of the collection that evaluate to true for the provided query predicate. Parameters: predicate - An OQL boolean query predicate. An iterator used to iterate over the elements that evaluated true for the predicate. exception: QueryInvalidException - The query predicate is invalid.

selectElement
public Object selectElement(String predicate) throws QueryInvalidException(Code)
	Selects the single element of the collection for which the provided OQL query predicate is true. Parameters: predicate - An OQL boolean query predicate. The element that evaluates to true for the predicate. If no elementevaluates to true, null is returned. exception: QueryInvalidException - The query predicate is invalid.

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