# Package org.apache.cayenne.util

package org.apache.cayenne.util
General utility classes.

- Related Packages
  Package
  Description
  org.apache.cayenne
  Contains persistence APIs directly accessible by users.
  org.apache.cayenne.util.commons
  org.apache.cayenne.util.concurrentlinkedhashmap
- Class
  Description
  ArrayUtil
  CayenneMapEntry
  Defining a double-linked named entry in CayenneMap.
  CompareToBuilder
  Assists in implementing `Comparable.compareTo(Object)` methods.
  ConversionUtil
  A collection of static conversion utility methods.
  DeepMergeOperation
  An operation that merges changes from an object graph, whose objects are registered in some ObjectContext, to peer objects in an ObjectConext that is a child of that context.
  DeleteRuleUpdater
  DeleteRuleUpdater is responsible for auto-setting delete rules for object relationships
  EntityMergeListener
  EntityMergeListener interface defines API useful for listening to EntityMergeSupport processing.
  EqualsBuilder
  Assists in implementing `Object.equals(Object)` methods.
  EventUtil
  Contains access stack events related utility methods.
  GenericQueryResult<T>
  Generic implementation of QueryResult using List as QueryResultItem storage.
  GenericResponse
  A simple serializable implementation of QueryResponse.
  HashCodeBuilder
  Assists in implementing `Object.hashCode()` methods.
  IDUtil
  helper class to generate pseudo-GUID sequences.
  IncrementalListResponse
  A QueryResponse that contains a sublist of the query result.
  IndexPropertyList
  A List implementation that would maintain its internal ordering based on some object numeric "index" property.
  Invocation
  Invocation represents a dynamic method invocation bound to a specific target.
  ListResponse
  A QueryResponse optimized to hold a single object or data row list.
  LocalizedStringsHandler
  Provides access to various modeler resources (mainly strings) obtained via a ResourceBundle.
  MemoryBlob
  A Blob implementation that stores content in memory.
  MemoryClob
  A Clob implementation that stores contents in memory.
  ObjectContextGraphAction
  A base implementation of a helper class to handle `ObjectContext.propertyChanged(org.apache.cayenne.Persistent, String, Object, Object)` processing on behalf of an ObjectContext.
  ObjectContextQueryAction
  A helper class that implements `DataChannel.onQuery(ObjectContext, Query)` logic on behalf of an ObjectContext.
  PersistentObjectCollection<E>
  Simple interface to unify PersistentObject* collections in way of setting properties directly
  PersistentObjectHolder<E>
  A ValueHolder implementation that holds a single Persistent object related to an object used to initialize PersistentObjectHolder.
  PersistentObjectList<E>
  A list of persistent objects lazily resolved on the first access.
  PersistentObjectMap
  PersistentObjectSet<E>
  ProcedureResultBuilder<T>
  QueryResultBuilder
  RelationshipFault<E>
  An abstract superclass of lazily faulted to-one and to-many relationships.
  ResultIteratorIterator<T>
  ShallowMergeOperation
  An operation that merges changes from a single object registered in some ObjectContext, to a peer object in an ObjectConext that is a child of that context.
  SingleEntryMap<K,V>
  Optimized mutable single-entry map.
  SoftValueMap<K,V>
  Map that stores values wrapped into `SoftReference`
  ToStringBuilder
  A utility class to simplify implementation of Object toString methods.
  Util
  Contains various unorganized static utility methods used across Cayenne.
  WeakValueMap<K,V>
  Map that stores values wrapped into `WeakReference`
  XMLEncoder
  A helper class to encode objects to XML.
  XMLSerializable
  Interface for Cayenne objects that can be saved to XML.