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Library providing immutable/persistent collection classes for
Java. While collections are immutable they provide methods for
adding and removing values by creating new modified copies of
themselves. Each copy shares almost all of its structure with
other copies to minimize memory consumption.
///###////////////////////////////////////////////////////////////////////////
//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2019, Burton Computer Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// Neither the name of the Burton Computer Corporation nor the names
// of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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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.stream.Collector;
/**
* Interface for maps that map keys to sets of values.
*/
@Immutable
public interface JImmutableSetMap
extends Insertable, JImmutableSetMap>,
Mapped>,
IterableStreamable>>,
InvariantCheckable
{
/**
* Return the set associated with key, or an empty set if no list is associated.
*/
@Nonnull
JImmutableSet getSet(@Nonnull K key);
/**
* Sets the set associated with a specific key. Key and value must be non-null.
* If the key already has a set in the map the old set is discarded and the
* new set is stored in its place. Returns a new JImmutableSetMap reflecting
* any changes. The original map is always left unchanged.
*/
@Nonnull
JImmutableSetMap assign(@Nonnull K key,
@Nonnull JImmutableSet value);
/**
* Add value to the Set for the specified key. Note that if the value has already been
* added, it will not be added again.
*/
@Nonnull
@Override
JImmutableSetMap insert(@Nonnull JImmutableMap.Entry value);
/**
* Add value to the Set for the specified key. Note that if the value has already been
* added, it will not be added again.
*/
@Nonnull
JImmutableSetMap insert(@Nonnull K key,
@Nonnull V value);
/**
* Adds all of the elements of the specified Iterable to the Set for the specified key.
*/
@Nonnull
JImmutableSetMap insertAll(@Nonnull K key,
@Nonnull Iterable values);
/**
* Adds all of the elements of the specified collection to the Set for the specified key.
*/
@Nonnull
JImmutableSetMap insertAll(@Nonnull K key,
@Nonnull Iterator values);
/**
* Determines if the setmap contains the specified key.
*/
boolean contains(@Nonnull K key);
/**
* Determines if the Set at key contains the specified value.
*
* @return true if the Set contains the value
*/
boolean contains(@Nonnull K key,
@Nullable V value);
/**
* Determines if the Set at key contains all values in the specified collection.
*
* @return true if the Set contains the values
*/
boolean containsAll(@Nonnull K key,
@Nonnull Iterable values);
/**
* Determines if the Set at key contains all values in the specified collection.
*
* @return true if the Set contains the values
*/
boolean containsAll(@Nonnull K key,
@Nonnull Iterator values);
/**
* Determines if the Set at key contains any values in the specified collection.
*
* @return true if the Set contains a value
*/
boolean containsAny(@Nonnull K key,
@Nonnull Iterable values);
/**
* Determines if the Set at key contains any values in the specified collection.
*
* @return true if the Set contains a value
*/
boolean containsAny(@Nonnull K key,
@Nonnull Iterator values);
/**
* Deletes the entry for the specified key (if any). Returns a new map if the value
* was deleted or the current map if the key was not contained in the map.
*/
@Nonnull
JImmutableSetMap delete(@Nonnull K key);
/**
* Deletes the specified value from the specified key's set. Returns a new map if the value
* was deleted or the current map if the key was not contained in the map.
*/
@Nonnull
JImmutableSetMap delete(@Nonnull K key,
@Nonnull V value);
/**
* Deletes the elements in other at the specified key. Returns a new map if the
* values were deleted or the current map if the key was not contained in the map.
*/
@Nonnull
JImmutableSetMap deleteAll(@Nonnull K key,
@Nonnull Iterable other);
/**
* Deletes the elements in other at the specified key. Returns a new map if the
* values were deleted or the current map if the key was not contained in the map.
*/
@Nonnull
JImmutableSetMap deleteAll(@Nonnull K key,
@Nonnull Iterator other);
/**
* Adds all values from other to the Set at key
*/
@Nonnull
JImmutableSetMap union(@Nonnull K key,
@Nonnull Iterable other);
/**
* Adds all values from other to the Set at key
*/
@Nonnull
JImmutableSetMap union(@Nonnull K key,
@Nonnull Iterator other);
/**
* Removes all values from the Set at key that are not contained in the other
* collection. If the given key is not present in the map, an empty set is added
* to the map.
*/
@Nonnull
JImmutableSetMap intersection(@Nonnull K key,
@Nonnull Iterable other);
/**
* Removes all values from the Set at key that are not contained in the other
* collection. If the given key is not present in the map, an empty set is added
* to the map.
*/
@Nonnull
JImmutableSetMap intersection(@Nonnull K key,
@Nonnull Iterator other);
/**
* Removes all values from the Set at key that are not contained in the other
* collection. If the given key is not present in the map, an empty set is added
* to the map.
*/
@Nonnull
JImmutableSetMap intersection(@Nonnull K key,
@Nonnull JImmutableSet other);
/**
* Removes all values from the Set at key that are not contained in the other
* collection. If the given key is not present in the map, an empty set is added
* to the map.
*/
@Nonnull
JImmutableSetMap intersection(@Nonnull K key,
@Nonnull Set other);
/**
* Apply the specified transform function to the Set assigned to the specified key and assign the result
* to the key in this map. If no Set is currently assigned to the key the transform function is called
* with an empty set.
*
* @param key key holding set to be updated
* @param transform function to update the set
* @return new map with update applied to set associated with key
*/
default JImmutableSetMap transform(@Nonnull K key,
@Nonnull Func1, JImmutableSet> transform)
{
final JImmutableSet current = getSet(key);
final JImmutableSet transformed = transform.apply(current);
return (transformed == current) ? this : assign(key, transformed);
}
/**
* Apply the specified transform function to the Set assigned to the specified key and assign the result
* to the key in this map. If no set is currently assigned to the key the transform function is never
* called and this map is returned unchanged.
*
* @param key key holding set to be updated
* @param transform function to update the set
* @return new map with update applied to set associated with key
*/
default JImmutableSetMap transformIfPresent(@Nonnull K key,
@Nonnull Func1, JImmutableSet> transform)
{
final JImmutableSet current = get(key);
if (current != null) {
final JImmutableSet transformed = transform.apply(current);
if (transformed != current) {
return assign(key, transformed);
}
}
return this;
}
/**
* Return the number of keys in the map.
*/
int size();
/**
* @return true only if the set contains no values
*/
boolean isEmpty();
/**
* @return an equivalent collectin with no values
*/
@Nonnull
JImmutableSetMap deleteAll();
/**
* Creates a Streamable to access all of the Map's keys.
*/
@Nonnull
IterableStreamable keys();
/**
* Creates a Streamable to access all of the specified key's set.
* If no set exists for key an empty Streamable is returned.
*
* @return a (possibly empty) Streamable for traversing the values associated with key
*/
@Nonnull
IterableStreamable values(@Nonnull K key);
/**
* Creates a Streamable to access all of the Map's entries.
*/
@Nonnull
IterableStreamable> entries();
/**
* Returns a Collector that creates a setMap of the same type as this containing all
* of the collected values inserted over whatever starting values this already contained.
*/
@Nonnull
default Collector, ?, JImmutableSetMap> setMapCollector()
{
return GenericCollector.unordered(this, deleteAll(), a -> a.isEmpty(), (a, v) -> a.insert(v), (a, b) -> a.insertAll(b.entries()));
}
}