Module com.aoapps.collections

Package com.aoapps.collections

Class UnionMethodSet<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

com.aoapps.collections.UnionMethodSet<E>

All Implemented Interfaces:

Iterable<E>, Collection<E>, Set<E>

public class UnionMethodSet<E>
extends AbstractSet<E>

A union set that assumes objects of different classes are not equal. It obtains the objects by invoking the provided methods. The provided methods will be invoked on an as-needed basis. It never does any combining.

The following assumptions are made:

1. All elements of the returned sets are of the same exact class (within a single method)
2. Objects of different classes are not equal.
3. No set will contain null

Author:

AO Industries, Inc.

See Also:

• This class is unmodifiable.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	UnionMethodSet.Method<E>
static class	UnionMethodSet.ReflectionMethod<E>
static class	UnionMethodSet.SetMethod<E>	A set of values will be obtained from the call to the method.
static class	UnionMethodSet.SingletonMethod<E>	A single value will be obtained from the call to the method.

Constructor Summary

Constructors

Constructor	Description
UnionMethodSet(Object target, Class<E> classE, Map<Class<? extends E>,? extends List<? extends UnionMethodSet.Method<? extends E>>> methodsByClass)

Method Summary

Modifier and Type	Method	Description
boolean	contains(Object element)
boolean	isEmpty()	Checks if this set is empty.
Iterator<E>	iterator()
int	size()	This is an expensive operation, since every single method is called, and when there are multiple methods for one class, the sets must be merged to avoid redundant values.

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, containsAll, remove, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

add, addAll, clear, containsAll, remove, retainAll, spliterator, toArray, toArray

Constructor Details

UnionMethodSet

public UnionMethodSet(Object target,
 Class<E> classE,
 Map<Class<? extends E>,? extends List<? extends UnionMethodSet.Method<? extends E>>> methodsByClass)

Method Details

size

public int size()

This is an expensive operation, since every single method is called, and when there are multiple methods for one class, the sets must be merged to avoid redundant values.

Specified by:

size in interface Collection<E>

Specified by:

size in interface Set<E>

Specified by:

size in class AbstractCollection<E>

isEmpty

public boolean isEmpty()

Checks if this set is empty. This can be an expensive method since it can potentially call all methods.

Specified by:

isEmpty in interface Collection<E>

Specified by:

isEmpty in interface Set<E>

Overrides:

isEmpty in class AbstractCollection<E>

contains

public boolean contains(Object element)

Specified by:

contains in interface Collection<E>

Specified by:

contains in interface Set<E>

Overrides:

contains in class AbstractCollection<E>

iterator

public Iterator<E> iterator()

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface Set<E>

Specified by:

iterator in class AbstractCollection<E>