org.javimmutable.collections.JImmutableSet Maven / Gradle / Ivy
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package org.javimmutable.collections;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import java.util.Iterator;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collector;
/**
* Interface for immutable sets.
*/
@SuppressWarnings("ClassWithTooManyMethods")
@Immutable
public interface JImmutableSet
extends Insertable>,
Cursorable,
IterableStreamable,
Mapped,
InvariantCheckable
{
/**
* Adds the single value to the Set.
*
* @return instance of set containing the value
*/
@Nonnull
@Override
JImmutableSet insert(@Nonnull T value);
/**
* Adds all of the elements of the specified collection to the set.
*
* @return instance of set containing the collection
*/
@Nonnull
@Override
JImmutableSet insertAll(@Nonnull Iterable values);
/**
* Adds all of the elements of the specified collection to the set.
*
* @return instance of set containing the collection
*/
@Nonnull
@Override
JImmutableSet insertAll(@Nonnull Cursor values);
/**
* Adds all of the elements of the specified collection to the set.
*
* @return instance of set containing the collection
*/
@Nonnull
@Override
JImmutableSet insertAll(@Nonnull Iterator values);
/**
* Determines if the Set contains the specified value.
*
* @return true if the Set contains the value
*/
boolean contains(@Nullable T value);
/**
* Determines if the Set contains all values in the specified collection.
*
* @return true if the Set contains the values
*/
boolean containsAll(@Nonnull Iterable values);
/**
* Determines if the Set contains all values in the specified collection.
*
* @return true if the Set contains the values
*/
boolean containsAll(@Nonnull Cursor values);
/**
* Determines if the Set contains all values in the specified collection.
*
* @return true if the Set contains the values
*/
boolean containsAll(@Nonnull Iterator values);
/**
* Determines if the Set contains any values in the specified collection.
*
* @return true if the Set contains a value
*/
boolean containsAny(@Nonnull Iterable values);
/**
* Determines if the Set contains any values in the specified collection.
*
* @return true if the Set contains a value
*/
boolean containsAny(@Nonnull Cursor values);
/**
* Determines if the Set contains any values in the specified collection.
*
* @return true if the Set contains a value
*/
boolean containsAny(@Nonnull Iterator values);
/**
* Removes the value from the Set. Has no effect if the value is not in the Set.
*
* @return instance of set without the value
*/
@Nonnull
JImmutableSet delete(T value);
/**
* Removes all values of other from the Set. Has no effect if none of the values are in the Set
*
* @return instance of set without the values
*/
@Nonnull
JImmutableSet deleteAll(@Nonnull Iterable other);
/**
* Removes all values of other from the Set. Has no effect if none of the values are in the Set
*
* @return instance of set without the values
*/
@Nonnull
JImmutableSet deleteAll(@Nonnull Cursor other);
/**
* Removes all values of other from the Set. Has no effect if none of the values are in the Set
*
* @return instance of set without the values
*/
@Nonnull
JImmutableSet deleteAll(@Nonnull Iterator other);
/**
* Adds all values from other to the Set.
*
* @param other source of values to add
* @return instance of set containing the values
*/
@Nonnull
JImmutableSet union(@Nonnull Iterable other);
/**
* Adds all values from other to the Set.
*
* @param values source of values to add
* @return instance of set containing the values
*/
@Nonnull
JImmutableSet union(@Nonnull Cursor values);
/**
* Adds all values from other to the Set.
*
* @param values source of values to add
* @return instance of set containing the values
*/
@Nonnull
JImmutableSet union(@Nonnull Iterator values);
/**
* Removes all values from the Set that are not contained in the other collection.
*
* @return instance of set with unmatched values removed
*/
@Nonnull
JImmutableSet intersection(@Nonnull Iterable other);
/**
* Removes all values from the Set that are not contained in the other collection.
*
* @return instance of set with unmatched values removed
*/
@Nonnull
JImmutableSet intersection(@Nonnull Cursor values);
/**
* Removes all values from the Set that are not contained in the other collection.
*
* @return instance of set with unmatched values removed
*/
@Nonnull
JImmutableSet intersection(@Nonnull Iterator values);
/**
* Removes all values from the Set that are not contained in the other collection.
*
* @return instance of set with unmatched values removed
*/
@Nonnull
JImmutableSet intersection(@Nonnull JImmutableSet other);
/**
* Removes all values from the Set that are not contained in the other collection.
*
* @return instance of set with unmatched values removed
*/
@Nonnull
JImmutableSet intersection(@Nonnull Set other);
/**
* Determines the number of values in the Set.
*
* @return number of values in the Set
*/
int size();
/**
* @return true only if set contains no values
*/
boolean isEmpty();
/**
* @return an equivalent collection with no values
*/
@Nonnull
JImmutableSet deleteAll();
/**
* @return an unmodifiable Set implementation backed by this set.
*/
@Nonnull
Set getSet();
/**
* Returns the specified key if its contained in the set. Otherwise returns null.
*
* @param key identifies the value to retrieve
* @return the key or null
*/
@Nullable
@Override
default T get(T key)
{
return contains(key) ? key : null;
}
/**
* Returns the specified key if its contained in the set. Otherwise returns defaultValue.
*
* @param key identifies the value to retrieve
* @return the key or defaultValue
*/
@Override
default T getValueOr(T key,
T defaultValue)
{
return contains(key) ? key : defaultValue;
}
/**
* Returns a Holder containing the specified key if its contained in the set.
* Otherwise returns an empty Holder.
*
* @param key identifies the value to retrieve
* @return possibly empty Holder
*/
@Nonnull
@Override
default Holder find(T key)
{
return contains(key) ? Holders.of(key) : Holders.of();
}
/**
* Apply the transform function to all elements in iterator order and add each transformed
* value to build a new collection the same type as this.
*
* @param transform transformation applied to each element
* @return the new collection after all elements have been processed
*/
@SuppressWarnings("unchecked")
default JImmutableSet transform(@Nonnull Func1 transform)
{
return transform((JImmutableSet)deleteAll(), transform);
}
/**
* Returns a set of the same type as this containing only those elements for which
* predicate returns true. Implementations are optimized assuming predicate will
* return false more often than true.
*
* @param predicate decides whether to include an element
* @return set of same type as this containing only those elements for which predicate returns true
*/
@Nonnull
default JImmutableSet select(@Nonnull Predicate predicate)
{
JImmutableSet answer = deleteAll();
for (T value : this) {
if (predicate.test(value)) {
answer = answer.insert(value);
}
}
return answer.size() == size() ? this : answer;
}
/**
* Returns a set of the same type as this containing all those elements for which
* predicate returns false. Implementations are optimized assuming predicate will
* return false more often than true.
*
* @param predicate decides whether to include an element
* @return set of same type as this containing only those elements for which predicate returns false
*/
@Nonnull
default JImmutableSet reject(@Nonnull Predicate predicate)
{
JImmutableSet answer = this;
for (T value : this) {
if (predicate.test(value)) {
answer = answer.delete(value);
}
}
return answer.size() == size() ? this : answer;
}
/**
* Returns a Collector that creates a set of the same type as this containing all
* of the collected values inserted over whatever starting values this already contained.
*/
@Nonnull
default Collector> setCollector()
{
return GenericCollector.unordered(this, deleteAll(), a -> a.isEmpty(), (a, v) -> a.insert(v), (a, b) -> a.insertAll(b));
}
}
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