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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) 2014, 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
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package org.javimmutable.collections.common;
import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Cursorable;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.cursors.Cursors;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
@Immutable
public abstract class AbstractJImmutableSet
implements JImmutableSet
{
private final JImmutableMap map;
protected AbstractJImmutableSet(JImmutableMap map)
{
this.map = map;
}
@Override
@Nonnull
public JImmutableSet insert(@Nonnull T value)
{
JImmutableMap newMap = map.assign(value, Boolean.TRUE);
return (newMap != map) ? create(newMap) : this;
}
@Override
public boolean contains(@Nullable T value)
{
return (value != null) && map.getValueOr(value, Boolean.FALSE);
}
@Override
public boolean containsAll(@Nonnull Cursorable values)
{
return containsAll(values.cursor());
}
@Override
public boolean containsAll(@Nonnull Collection values)
{
return containsAll(values.iterator());
}
@Override
public boolean containsAll(@Nonnull Cursor values)
{
for (Cursor c = values.start(); c.hasValue(); c = c.next()) {
if (!contains(c.getValue())) {
return false;
}
}
return true;
}
@Override
public boolean containsAll(@Nonnull Iterator values)
{
while (values.hasNext()) {
if (!contains(values.next())) {
return false;
}
}
return true;
}
@Override
public boolean containsAny(@Nonnull Cursorable values)
{
return containsAny(values.cursor());
}
@Override
public boolean containsAny(@Nonnull Collection values)
{
return containsAny(values.iterator());
}
@Override
public boolean containsAny(@Nonnull Cursor values)
{
for (Cursor c = values.start(); c.hasValue(); c = c.next()) {
if (contains(c.getValue())) {
return true;
}
}
return false;
}
@Override
public boolean containsAny(@Nonnull Iterator values)
{
while (values.hasNext()) {
if (contains(values.next())) {
return true;
}
}
return false;
}
@Nonnull
@Override
public JImmutableSet delete(T value)
{
JImmutableMap newMap = map.delete(value);
return (newMap != map) ? create(newMap) : this;
}
@Nonnull
@Override
public JImmutableSet deleteAll(@Nonnull Cursorable other)
{
return deleteAll(other.cursor());
}
@Nonnull
@Override
public JImmutableSet deleteAll(@Nonnull Collection other)
{
return deleteAll(other.iterator());
}
@Nonnull
@Override
public JImmutableSet deleteAll(@Nonnull Cursor values)
{
JImmutableMap newMap = map;
for (Cursor c = values.start(); c.hasValue(); c = c.next()) {
final T value = c.getValue();
if (value != null) {
newMap = newMap.delete(value);
}
}
return (newMap != map) ? create(newMap) : this;
}
@Nonnull
@Override
public JImmutableSet deleteAll(@Nonnull Iterator values)
{
JImmutableMap newMap = map;
while (values.hasNext()) {
final T value = values.next();
if (value != null) {
newMap = newMap.delete(value);
}
}
return (newMap != map) ? create(newMap) : this;
}
@Nonnull
@Override
public JImmutableSet union(@Nonnull Cursorable other)
{
return union(other.cursor());
}
@Nonnull
@Override
public JImmutableSet union(@Nonnull Collection other)
{
return union(other.iterator());
}
@Nonnull
@Override
public JImmutableSet union(@Nonnull Cursor values)
{
JImmutableMap newMap = map;
for (Cursor c = values.start(); c.hasValue(); c = c.next()) {
final T value = c.getValue();
if (value != null) {
newMap = newMap.assign(value, Boolean.TRUE);
}
}
return (newMap != map) ? create(newMap) : this;
}
@Nonnull
@Override
public JImmutableSet union(@Nonnull Iterator values)
{
JImmutableMap newMap = map;
while (values.hasNext()) {
final T value = values.next();
if (value != null) {
newMap = newMap.assign(value, Boolean.TRUE);
}
}
return (newMap != map) ? create(newMap) : this;
}
@Nonnull
@Override
public JImmutableSet intersection(@Nonnull Cursorable other)
{
return intersection(other.cursor());
}
@Nonnull
@Override
public JImmutableSet intersection(@Nonnull Collection other)
{
return intersection(other.iterator());
}
@Nonnull
@Override
public JImmutableSet intersection(@Nonnull Cursor values)
{
if (isEmpty()) {
return this;
}
JImmutableMap newMap = emptyMap();
for (Cursor c = values.start(); c.hasValue(); c = c.next()) {
final T value = c.getValue();
if ((value != null) && map.getValueOr(value, Boolean.FALSE)) {
newMap = newMap.assign(value, Boolean.TRUE);
}
}
return create(newMap);
}
@Nonnull
@Override
public JImmutableSet intersection(@Nonnull Iterator values)
{
if (isEmpty()) {
return this;
}
JImmutableMap newMap = emptyMap();
while (values.hasNext()) {
final T value = values.next();
if ((value != null) && map.getValueOr(value, Boolean.FALSE)) {
newMap = newMap.assign(value, Boolean.TRUE);
}
}
return create(newMap);
}
@Nonnull
@Override
public JImmutableSet intersection(@Nonnull JImmutableSet other)
{
if (isEmpty()) {
return this;
} else if (other.isEmpty()) {
return deleteAll();
}
JImmutableMap newMap = map;
for (Cursor> c = map.cursor().start(); c.hasValue(); c = c.next()) {
final T value = c.getValue().getKey();
if (!other.contains(value)) {
newMap = newMap.delete(value);
}
}
return (newMap != map) ? create(newMap) : this;
}
@Nonnull
@Override
public JImmutableSet intersection(@Nonnull Set other)
{
if (isEmpty()) {
return this;
} else if (other.isEmpty()) {
return deleteAll();
}
JImmutableMap newMap = map;
for (Cursor> c = map.cursor().start(); c.hasValue(); c = c.next()) {
final T value = c.getValue().getKey();
if (!other.contains(value)) {
newMap = newMap.delete(value);
}
}
return (newMap != map) ? create(newMap) : this;
}
@Override
public int size()
{
return map.size();
}
@Override
public boolean isEmpty()
{
return map.isEmpty();
}
@Nonnull
@Override
public Set getSet()
{
return SetAdaptor.of(this);
}
@Override
@Nonnull
public Cursor cursor()
{
return map.keysCursor();
}
@Override
public Iterator iterator()
{
return IteratorAdaptor.of(cursor());
}
@Override
public int hashCode()
{
return Cursors.computeHashCode(cursor());
}
@Override
public boolean equals(Object o)
{
if (o == this) {
return true;
} else if (o == null) {
return false;
} else if (o instanceof JImmutableSet) {
return getSet().equals(((JImmutableSet)o).getSet());
} else {
return (o instanceof Set) && getSet().equals(o);
}
}
@Override
public String toString()
{
return Cursors.makeString(cursor());
}
/**
* Implemented by derived classes to create a new instance of the appropriate class.
*
* @param map
* @return
*/
protected abstract JImmutableSet create(JImmutableMap map);
/**
* Implemented by derived classes to create a new empty PersistentMap for use by retainAll()
*
* @return
*/
protected abstract JImmutableMap emptyMap();
}