Java Doc for DerivedSet.java in  » GIS » GeoTools-2.4.1 » org » geotools » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.util   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.util.AbstractSet    org.geotools.util.DerivedSet DerivedSet abstract public class DerivedSet extends AbstractSet implements Serializable(Code) A set whose values are derived from an other set. The values are derived only when requested, which make it possible to backup potentially large sets. Implementations need only to overrides DerivedSet.baseToDerived and DerivedSet.derivedToBase methods. This set do not supports null value, since null is used when no mapping from to this exists. This class is serializable if the underlying set is serializable too. since:    2.0 version:    $Id: DerivedSet.java 22443 2006-10-27 20:47:22Z desruisseaux $ author:    Martin Desruisseaux Field Summary final protected  Set base      The base set whose values are derived from. Constructor Summary public   DerivedSet(Set base)      Creates a new derived set from the specified base set. Method Summary public  boolean add(Object element)      Ensures that this set contains the specified element. The default implementation invokes .add( (element)). Parameters:   element - element whose presence in this set is to be ensured. abstract protected  Object baseToDerived(Object element)      Transforms a value in the set to a value in this set. If there is no mapping in the derived set for the specified element, then this method returns null . Parameters:   element - A value in the set. public  boolean contains(Object element)      Returns true if this set contains the specified element. The default implementation invokes .contains( (element)). Parameters:   element - object to be checked for containment in this set. abstract protected  Object derivedToBase(Object element)      Transforms a value in this set to a value in the set. Parameters:   element - A value in this set. public  boolean isEmpty()      Returns true if this set contains no elements. public  Iterator iterator()      Returns an iterator over the elements contained in this set. public  boolean remove(Object element)      Removes a single instance of the specified element from this set. The default implementation invokes .remove( (element)). Parameters:   element - element to be removed from this set, if present. public  int size()      Returns the number of elements in this set. Field Detail base final protected Set base(Code) The base set whose values are derived from. See Also:   DerivedSet.baseToDerived See Also:   DerivedSet.derivedToBase Constructor Detail DerivedSet public DerivedSet(Set base)(Code) Creates a new derived set from the specified base set. Parameters:   base - The base set. Method Detail add public boolean add(Object element) throws UnsupportedOperationException(Code) Ensures that this set contains the specified element. The default implementation invokes .add( (element)). Parameters:   element - element whose presence in this set is to be ensured. true if the set changed as a result of the call. throws:   UnsupportedOperationException - if the set doesn'tsupports the add operation. baseToDerived abstract protected Object baseToDerived(Object element)(Code) Transforms a value in the set to a value in this set. If there is no mapping in the derived set for the specified element, then this method returns null . Parameters:   element - A value in the set. The value that this view should contains instead of element ,or null . contains public boolean contains(Object element)(Code) Returns true if this set contains the specified element. The default implementation invokes .contains( (element)). Parameters:   element - object to be checked for containment in this set. true if this set contains the specified element. derivedToBase abstract protected Object derivedToBase(Object element)(Code) Transforms a value in this set to a value in the set. Parameters:   element - A value in this set. The value stored in the set. isEmpty public boolean isEmpty()(Code) Returns true if this set contains no elements. true if this set contains no elements. iterator public Iterator iterator()(Code) Returns an iterator over the elements contained in this set. The iterator will invokes DerivedSet.baseToDerived for each element. an iterator over the elements contained in this set. remove public boolean remove(Object element) throws UnsupportedOperationException(Code) Removes a single instance of the specified element from this set. The default implementation invokes .remove( (element)). Parameters:   element - element to be removed from this set, if present. true if the set contained the specified element. throws:   UnsupportedOperationException - if the set doesn'tsupports the remove operation. size public int size()(Code) Returns the number of elements in this set. The default implementation counts the number of elements returned by the DerivedSet.iterator iterator . the number of elements in this set. Methods inherited from java.util.AbstractSet public boolean equals(Object o)(Code)(Java Doc) public int hashCode()(Code)(Java Doc) public boolean removeAll(Collection c)(Code)(Java Doc)