Package org.apache.metamodel.util

Utilities and convenient classes

See: Description

Interface Summary

Interface	Description
Action<E>	Represents an abstract action, which is an executable piece of functionality that takes an argument.
AggregateBuilder<E>	Interface for aggregate builders which allows for an iterative approach to evaluating aggregates.
Func<I,O>	Deprecated use Function instead
HasName	Represents anything with a (String based) name.
Predicate<E>	Deprecated use Predicate instead
Ref<E>	Deprecated use Supplier instead
Resource	Represents a resource from which we can read and write bytes
UncheckedFunc<I,O>	Represents a Function that allows for throwing checked exceptions, making it more appropriate for encapsulating code blocks that may fail.

Class Summary

Class	Description
AbstractDirectoryInputStream<T>
AbstractNumberAggregateBuilder<N extends Number>	Abstract AggregateBuilder that works on numbers.
AbstractResource	Abstract implementation of many methods in Resource
AlphabeticSequence	A sequence based on alphabetic representations.
BaseObject	A base object type with conveniently implemented base methods like hashCode() and equals().
BooleanComparator	Comparator of booleans
ClasspathResource	A Resource based on a classpath entry
CollectionUtils	Various utility methods for handling of collections and arrays.
ConstantFunc<I,O>	A function that always returns the same constant response.
DateUtils	Various utility methods pertaining to date handling
EqualsBuilder	A helper class for implementing equals(...) methods.
ExclusionPredicate<E>	A predicate that uses an exclusion list ("black list") of elements to determine whether to evaluate true or false.
FalsePredicate<E>	A predicate that is always false
FileHelper	Various helper methods for handling files
FileResource	File based Resource implementation.
FormatHelper	Helper class for formatting
HasNameMapper	Func useful for mapping HasName instances to names, using CollectionUtils#map(Object[], Func) and CollectionUtils#map(Iterable, Func).
HdfsResource	A Resource implementation that connects to Apache Hadoop's HDFS distributed file system.
ImmutableRef<E>	Simple/hard implementation of the Ref interface.
InclusionPredicate<E>	A predicate that uses an inclusion list ("white list") of elements to determine whether to evaluate true or false.
InMemoryResource	An entirely in-memory kept Resource.
LazyRef<E>	Represents a lazy loaded reference.
LegacyDeserializationObjectInputStream	A specialized ObjectInputStream for MetaModel which can be used or extended if it is needed to deserialize legacy MetaModel objects.
MutableRef<E>	Represents a mutable reference to any object
NumberComparator	Comparator that can compare numbers of various kinds (short, integer, float, double etc)
ObjectComparator	General purpose comparator to use for objects of various kinds.
ResourceUtils	Static utility methods for handling Resources.
SerializableRef<E>	A serializable reference to an object which may or may not be serializable.
SharedExecutorService	A shared ExecutorService for use on ad-hoc tasks that can be optimized by running operations in parallel.
SimpleTableDef	Represents a table definition to be used in scenarios where a DataContext is unable to detect/discover the table structure and needs some basic input around expected table structures.
SimpleTableDefParser
TimeComparator	Compares dates of various formats.
ToStringComparator	Uses the toString method for comparison of objects
TruePredicate<E>	A predicate that is always true
UnicodeWriter	Writes Unicode text to an output stream.
UrlResource	Resource based on URL or URI.
WildcardPattern	Represents a pattern with a wildcard character.

Enum Summary

Enum	Description
LegacyDeserializationObjectInputStream.LegacyColumnType	Implementation of the new ColumnType interface which still adheres to the constant/enum values of the old ColumnType definition.
LegacyDeserializationObjectInputStream.LegacyFunctionType	Implementation of the new FunctionType and AggregateFunction interfaces which still adheres to the constant/enum values of the old FunctionType definition.
LegacyDeserializationObjectInputStream.LegacyOperatorType	Implementation of the new OperatorType interface which still adheres to the constant/enum values of the old OperatorType definition.
Month	Provides a handy and type-safe enum around the months otherwise defined as int constants in java.util.Calendar.
Weekday	Provides a handy and type-safe enum around the weekdays otherwise defined as int constants in java.util.Calendar.

Exception Summary

Exception	Description
ResourceException	Exception type for errors that occur while dealing with Resources.

Package org.apache.metamodel.util Description

Utilities and convenient classes