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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map
implementations with a rich API and set of utility classes that work with any JDK compatible Collections,
Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
/*
* Copyright 2015 Goldman Sachs.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.gs.collections.impl.utility.internal;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import com.gs.collections.api.RichIterable;
import com.gs.collections.api.block.HashingStrategy;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function0;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.block.function.Function3;
import com.gs.collections.api.block.function.primitive.BooleanFunction;
import com.gs.collections.api.block.function.primitive.ByteFunction;
import com.gs.collections.api.block.function.primitive.CharFunction;
import com.gs.collections.api.block.function.primitive.DoubleFunction;
import com.gs.collections.api.block.function.primitive.DoubleObjectToDoubleFunction;
import com.gs.collections.api.block.function.primitive.FloatFunction;
import com.gs.collections.api.block.function.primitive.FloatObjectToFloatFunction;
import com.gs.collections.api.block.function.primitive.IntFunction;
import com.gs.collections.api.block.function.primitive.IntObjectToIntFunction;
import com.gs.collections.api.block.function.primitive.LongFunction;
import com.gs.collections.api.block.function.primitive.LongObjectToLongFunction;
import com.gs.collections.api.block.function.primitive.ShortFunction;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.api.collection.MutableCollection;
import com.gs.collections.api.collection.primitive.MutableBooleanCollection;
import com.gs.collections.api.collection.primitive.MutableByteCollection;
import com.gs.collections.api.collection.primitive.MutableCharCollection;
import com.gs.collections.api.collection.primitive.MutableDoubleCollection;
import com.gs.collections.api.collection.primitive.MutableFloatCollection;
import com.gs.collections.api.collection.primitive.MutableIntCollection;
import com.gs.collections.api.collection.primitive.MutableLongCollection;
import com.gs.collections.api.collection.primitive.MutableShortCollection;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.ImmutableMultimap;
import com.gs.collections.api.multimap.MutableMultimap;
import com.gs.collections.api.partition.PartitionMutableCollection;
import com.gs.collections.api.partition.list.PartitionMutableList;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.api.tuple.Twin;
import com.gs.collections.impl.block.factory.Functions0;
import com.gs.collections.impl.block.factory.HashingStrategies;
import com.gs.collections.impl.block.procedure.MutatingAggregationProcedure;
import com.gs.collections.impl.block.procedure.NonMutatingAggregationProcedure;
import com.gs.collections.impl.factory.Lists;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.list.mutable.primitive.BooleanArrayList;
import com.gs.collections.impl.list.mutable.primitive.ByteArrayList;
import com.gs.collections.impl.list.mutable.primitive.CharArrayList;
import com.gs.collections.impl.list.mutable.primitive.DoubleArrayList;
import com.gs.collections.impl.list.mutable.primitive.FloatArrayList;
import com.gs.collections.impl.list.mutable.primitive.IntArrayList;
import com.gs.collections.impl.list.mutable.primitive.LongArrayList;
import com.gs.collections.impl.list.mutable.primitive.ShortArrayList;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.multimap.list.FastListMultimap;
import com.gs.collections.impl.partition.list.PartitionFastList;
import com.gs.collections.impl.set.mutable.UnifiedSet;
import com.gs.collections.impl.set.strategy.mutable.UnifiedSetWithHashingStrategy;
import com.gs.collections.impl.tuple.Tuples;
import com.gs.collections.impl.utility.Iterate;
/**
* The IteratorIterate class implementations of the various iteration patterns for use with java.util.Iterator.
*/
public final class IteratorIterate
{
private IteratorIterate()
{
throw new AssertionError("Suppress default constructor for noninstantiability");
}
/**
* @see Iterate#selectAndRejectWith(Iterable, Predicate2, Object)
*/
public static Twin> selectAndRejectWith(
Iterator iterator,
Predicate2 predicate,
P parameter)
{
MutableList positiveResult = Lists.mutable.empty();
MutableList negativeResult = Lists.mutable.empty();
while (iterator.hasNext())
{
T item = iterator.next();
(predicate.accept(item, parameter) ? positiveResult : negativeResult).add(item);
}
return Tuples.twin(positiveResult, negativeResult);
}
/**
* @see Iterate#partition(Iterable, Predicate)
*/
public static PartitionMutableList partition(Iterator iterator, Predicate predicate)
{
PartitionMutableList result = new PartitionFastList();
MutableList selected = result.getSelected();
MutableList rejected = result.getRejected();
while (iterator.hasNext())
{
T each = iterator.next();
MutableList bucket = predicate.accept(each) ? selected : rejected;
bucket.add(each);
}
return result;
}
/**
* @see Iterate#partitionWith(Iterable, Predicate2, Object)
* @since 5.0
*/
public static PartitionMutableList partitionWith(
Iterator iterator,
Predicate2 predicate,
P parameter)
{
PartitionMutableList result = new PartitionFastList();
MutableList selected = result.getSelected();
MutableList rejected = result.getRejected();
while (iterator.hasNext())
{
T each = iterator.next();
MutableList bucket = predicate.accept(each, parameter) ? selected : rejected;
bucket.add(each);
}
return result;
}
public static > R partitionWhile(Iterator iterator, Predicate predicate, R target)
{
MutableCollection selected = target.getSelected();
MutableCollection rejected = target.getRejected();
boolean partitionFound = false;
while (iterator.hasNext() && !partitionFound)
{
T next = iterator.next();
if (predicate.accept(next))
{
selected.add(next);
}
else
{
rejected.add(next);
partitionFound = true;
}
}
while (iterator.hasNext())
{
rejected.add(iterator.next());
}
return target;
}
public static > R takeWhile(Iterator iterator, Predicate predicate, R target)
{
while (iterator.hasNext())
{
T next = iterator.next();
if (predicate.accept(next))
{
target.add(next);
}
else
{
return target;
}
}
return target;
}
public static > R dropWhile(Iterator iterator, Predicate predicate, R target)
{
boolean partitionFound = false;
while (iterator.hasNext() && !partitionFound)
{
T next = iterator.next();
if (!predicate.accept(next))
{
target.add(next);
partitionFound = true;
}
}
while (iterator.hasNext())
{
target.add(iterator.next());
}
return target;
}
/**
* @see Iterate#count(Iterable, Predicate)
*/
public static int count(Iterator iterator, Predicate predicate)
{
int count = 0;
while (iterator.hasNext())
{
if (predicate.accept(iterator.next()))
{
count++;
}
}
return count;
}
/**
* @see Iterate#countWith(Iterable, Predicate2, Object)
*/
public static int countWith(
Iterator iterator,
Predicate2 predicate,
P parameter)
{
int count = 0;
while (iterator.hasNext())
{
if (predicate.accept(iterator.next(), parameter))
{
count++;
}
}
return count;
}
/**
* @see Iterate#select(Iterable, Predicate, Collection)
*/
public static > R select(
Iterator iterator,
Predicate predicate,
R targetCollection)
{
while (iterator.hasNext())
{
T item = iterator.next();
if (predicate.accept(item))
{
targetCollection.add(item);
}
}
return targetCollection;
}
/**
* @see Iterate#selectWith(Iterable, Predicate2, Object, Collection)
*/
public static > R selectWith(
Iterator iterator,
Predicate2 predicate,
P injectedValue,
R targetCollection)
{
while (iterator.hasNext())
{
T item = iterator.next();
if (predicate.accept(item, injectedValue))
{
targetCollection.add(item);
}
}
return targetCollection;
}
/**
* @see Iterate#selectInstancesOf(Iterable, Class)
*/
public static > R selectInstancesOf(
Iterator iterator,
Class clazz,
R targetCollection)
{
while (iterator.hasNext())
{
Object item = iterator.next();
if (clazz.isInstance(item))
{
targetCollection.add((T) item);
}
}
return targetCollection;
}
/**
* @see Iterate#selectWith(Iterable, Predicate2, Object, Collection)
*/
public static > R collectIf(
Iterator iterator,
Predicate predicate,
Function function,
R targetCollection)
{
while (iterator.hasNext())
{
T item = iterator.next();
if (predicate.accept(item))
{
targetCollection.add(function.valueOf(item));
}
}
return targetCollection;
}
/**
* @see Iterate#reject(Iterable, Predicate, Collection)
*/
public static > R reject(
Iterator iterator,
Predicate predicate,
R targetCollection)
{
while (iterator.hasNext())
{
T item = iterator.next();
if (!predicate.accept(item))
{
targetCollection.add(item);
}
}
return targetCollection;
}
/**
* @see Iterate#rejectWith(Iterable, Predicate2, Object, Collection)
*/
public static > R rejectWith(
Iterator iterator,
Predicate2 predicate,
P parameter,
R targetCollection)
{
while (iterator.hasNext())
{
T item = iterator.next();
if (!predicate.accept(item, parameter))
{
targetCollection.add(item);
}
}
return targetCollection;
}
/**
* @see Iterate#collect(Iterable, Function, Collection)
*/
public static > R collect(
Iterator iterator,
Function function,
R targetCollection)
{
while (iterator.hasNext())
{
targetCollection.add(function.valueOf(iterator.next()));
}
return targetCollection;
}
/**
* @see Iterate#collectBoolean(Iterable, BooleanFunction)
*/
public static MutableBooleanCollection collectBoolean(
Iterator iterator,
BooleanFunction booleanFunction)
{
MutableBooleanCollection result = new BooleanArrayList();
while (iterator.hasNext())
{
result.add(booleanFunction.booleanValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectBoolean(Iterable, BooleanFunction, MutableBooleanCollection)
*/
public static R collectBoolean(
Iterator iterator,
BooleanFunction booleanFunction,
R target)
{
while (iterator.hasNext())
{
target.add(booleanFunction.booleanValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#collectByte(Iterable, ByteFunction)
*/
public static MutableByteCollection collectByte(
Iterator iterator,
ByteFunction byteFunction)
{
MutableByteCollection result = new ByteArrayList();
while (iterator.hasNext())
{
result.add(byteFunction.byteValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectByte(Iterable, ByteFunction,
* MutableByteCollection)
*/
public static R collectByte(
Iterator iterator,
ByteFunction byteFunction,
R target)
{
while (iterator.hasNext())
{
target.add(byteFunction.byteValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#collectChar(Iterable, CharFunction)
*/
public static MutableCharCollection collectChar(
Iterator iterator,
CharFunction charFunction)
{
MutableCharCollection result = new CharArrayList();
while (iterator.hasNext())
{
result.add(charFunction.charValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectChar(Iterable, CharFunction,
* MutableCharCollection)
*/
public static R collectChar(
Iterator iterator,
CharFunction charFunction,
R target)
{
while (iterator.hasNext())
{
target.add(charFunction.charValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#collectDouble(Iterable, DoubleFunction)
*/
public static MutableDoubleCollection collectDouble(
Iterator iterator,
DoubleFunction doubleFunction)
{
MutableDoubleCollection result = new DoubleArrayList();
while (iterator.hasNext())
{
result.add(doubleFunction.doubleValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectDouble(Iterable, DoubleFunction,
* MutableDoubleCollection)
*/
public static R collectDouble(
Iterator iterator,
DoubleFunction doubleFunction,
R target)
{
while (iterator.hasNext())
{
target.add(doubleFunction.doubleValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#collectFloat(Iterable, FloatFunction)
*/
public static MutableFloatCollection collectFloat(
Iterator iterator,
FloatFunction floatFunction)
{
MutableFloatCollection result = new FloatArrayList();
while (iterator.hasNext())
{
result.add(floatFunction.floatValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectFloat(Iterable, FloatFunction,
* MutableFloatCollection)
*/
public static R collectFloat(
Iterator iterator,
FloatFunction floatFunction,
R target)
{
while (iterator.hasNext())
{
target.add(floatFunction.floatValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#collectInt(Iterable, IntFunction)
*/
public static MutableIntCollection collectInt(
Iterator iterator,
IntFunction intFunction)
{
MutableIntCollection result = new IntArrayList();
while (iterator.hasNext())
{
result.add(intFunction.intValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectInt(Iterable, IntFunction,
* MutableIntCollection)
*/
public static R collectInt(
Iterator iterator,
IntFunction intFunction,
R target)
{
while (iterator.hasNext())
{
target.add(intFunction.intValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#collectLong(Iterable, LongFunction)
*/
public static MutableLongCollection collectLong(
Iterator iterator,
LongFunction longFunction)
{
MutableLongCollection result = new LongArrayList();
while (iterator.hasNext())
{
result.add(longFunction.longValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectLong(Iterable, LongFunction,
* MutableLongCollection)
*/
public static R collectLong(
Iterator iterator,
LongFunction longFunction,
R target)
{
while (iterator.hasNext())
{
target.add(longFunction.longValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#collectShort(Iterable, ShortFunction)
*/
public static MutableShortCollection collectShort(
Iterator iterator,
ShortFunction shortFunction)
{
MutableShortCollection result = new ShortArrayList();
while (iterator.hasNext())
{
result.add(shortFunction.shortValueOf(iterator.next()));
}
return result;
}
/**
* @see Iterate#collectShort(Iterable, ShortFunction,
* MutableShortCollection)
*/
public static R collectShort(
Iterator iterator,
ShortFunction shortFunction,
R target)
{
while (iterator.hasNext())
{
target.add(shortFunction.shortValueOf(iterator.next()));
}
return target;
}
/**
* @see Iterate#flatCollect(Iterable, Function, Collection)
*/
public static > R flatCollect(
Iterator iterator,
Function> function,
R targetCollection)
{
while (iterator.hasNext())
{
Iterate.addAllTo(function.valueOf(iterator.next()), targetCollection);
}
return targetCollection;
}
/**
* @see Iterate#forEach(Iterable, Procedure)
*/
public static void forEach(Iterator iterator, Procedure procedure)
{
while (iterator.hasNext())
{
procedure.value(iterator.next());
}
}
/**
* @see Iterate#forEachWithIndex(Iterable, ObjectIntProcedure)
*/
public static void forEachWithIndex(Iterator iterator, ObjectIntProcedure objectIntProcedure)
{
int i = 0;
while (iterator.hasNext())
{
objectIntProcedure.value(iterator.next(), i++);
}
}
/**
* @see Iterate#detect(Iterable, Predicate)
*/
public static T detect(Iterator iterator, Predicate predicate)
{
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate.accept(each))
{
return each;
}
}
return null;
}
/**
* @see Iterate#detectWith(Iterable, Predicate2, Object)
*/
public static T detectWith(Iterator iterator, Predicate2 predicate, P parameter)
{
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate.accept(each, parameter))
{
return each;
}
}
return null;
}
/**
* @see Iterate#injectInto(Object, Iterable, Function2)
*/
public static IV injectInto(
IV injectValue,
Iterator iterator,
Function2 function)
{
IV result = injectValue;
while (iterator.hasNext())
{
result = function.value(result, iterator.next());
}
return result;
}
/**
* @see Iterate#injectInto(int, Iterable, IntObjectToIntFunction)
*/
public static int injectInto(
int injectValue,
Iterator iterator,
IntObjectToIntFunction function)
{
int result = injectValue;
while (iterator.hasNext())
{
result = function.intValueOf(result, iterator.next());
}
return result;
}
/**
* @see Iterate#injectInto(long, Iterable, LongObjectToLongFunction)
*/
public static long injectInto(
long injectValue,
Iterator iterator,
LongObjectToLongFunction function)
{
long result = injectValue;
while (iterator.hasNext())
{
result = function.longValueOf(result, iterator.next());
}
return result;
}
/**
* @see Iterate#injectInto(double, Iterable, DoubleObjectToDoubleFunction)
*/
public static double injectInto(
double injectValue,
Iterator iterator,
DoubleObjectToDoubleFunction function)
{
double result = injectValue;
while (iterator.hasNext())
{
result = function.doubleValueOf(result, iterator.next());
}
return result;
}
/**
* @see Iterate#injectInto(float, Iterable, FloatObjectToFloatFunction)
*/
public static float injectInto(
float injectValue,
Iterator iterator,
FloatObjectToFloatFunction function)
{
float result = injectValue;
while (iterator.hasNext())
{
result = function.floatValueOf(result, iterator.next());
}
return result;
}
/**
* @see Iterate#injectIntoWith(Object, Iterable, Function3, Object)
*/
public static IV injectIntoWith(IV injectValue, Iterator iterator, Function3 function, P parameter)
{
IV result = injectValue;
while (iterator.hasNext())
{
result = function.value(result, iterator.next(), parameter);
}
return result;
}
public static boolean shortCircuit(
Iterator iterator,
Predicate predicate,
boolean expected,
boolean onShortCircuit,
boolean atEnd)
{
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate.accept(each) == expected)
{
return onShortCircuit;
}
}
return atEnd;
}
public static boolean shortCircuitWith(
Iterator iterator,
Predicate2 predicate2,
P parameter,
boolean expected,
boolean onShortCircuit,
boolean atEnd)
{
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate2.accept(each, parameter) == expected)
{
return onShortCircuit;
}
}
return atEnd;
}
/**
* @see Iterate#anySatisfy(Iterable, Predicate)
*/
public static boolean anySatisfy(Iterator iterator, Predicate predicate)
{
return IteratorIterate.shortCircuit(iterator, predicate, true, true, false);
}
/**
* @see Iterate#anySatisfyWith(Iterable, Predicate2, Object)
*/
public static boolean anySatisfyWith(Iterator iterator, Predicate2 predicate, P parameter)
{
return IteratorIterate.shortCircuitWith(iterator, predicate, parameter, true, true, false);
}
/**
* @see Iterate#allSatisfy(Iterable, Predicate)
*/
public static boolean allSatisfy(Iterator iterator, Predicate predicate)
{
return IteratorIterate.shortCircuit(iterator, predicate, false, false, true);
}
/**
* @see Iterate#allSatisfyWith(Iterable, Predicate2, Object)
*/
public static boolean allSatisfyWith(Iterator iterator, Predicate2 predicate, P parameter)
{
return IteratorIterate.shortCircuitWith(iterator, predicate, parameter, false, false, true);
}
/**
* @see Iterate#noneSatisfy(Iterable, Predicate)
*/
public static boolean noneSatisfy(Iterator iterator, Predicate predicate)
{
return IteratorIterate.shortCircuit(iterator, predicate, true, false, true);
}
/**
* @see Iterate#noneSatisfyWith(Iterable, Predicate2, Object)
*/
public static boolean noneSatisfyWith(Iterator iterator, Predicate2 predicate, P parameter)
{
return IteratorIterate.shortCircuitWith(iterator, predicate, parameter, true, false, true);
}
/**
* @see Iterate#removeIf(Iterable, Predicate)
*/
public static boolean removeIf(Iterator iterator, Predicate predicate)
{
boolean changed = false;
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate.accept(each))
{
iterator.remove();
changed = true;
}
}
return changed;
}
/**
* @see Iterate#removeIfWith(Iterable, Predicate2, Object)
*/
public static boolean removeIfWith(Iterator iterator, Predicate2 predicate, P parameter)
{
boolean changed = false;
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate.accept(each, parameter))
{
iterator.remove();
changed = true;
}
}
return changed;
}
public static boolean removeIf(Iterator iterator, Predicate predicate, Procedure procedure)
{
boolean changed = false;
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate.accept(each))
{
procedure.value(each);
iterator.remove();
changed = true;
}
}
return changed;
}
public static boolean removeIfWith(Iterator iterator, Predicate2 predicate, P parameter, Procedure procedure)
{
boolean changed = false;
while (iterator.hasNext())
{
T each = iterator.next();
if (predicate.accept(each, parameter))
{
procedure.value(each);
iterator.remove();
changed = true;
}
}
return changed;
}
/**
* @see Iterate#detectIndex(Iterable, Predicate)
*/
public static int detectIndex(Iterator iterator, Predicate predicate)
{
int i = 0;
while (iterator.hasNext())
{
if (predicate.accept(iterator.next()))
{
return i;
}
i++;
}
return -1;
}
/**
* @see Iterate#detectIndexWith(Iterable, Predicate2, Object)
*/
public static int detectIndexWith(Iterator iterator, Predicate2 predicate, IV injectedValue)
{
int i = 0;
while (iterator.hasNext())
{
if (predicate.accept(iterator.next(), injectedValue))
{
return i;
}
i++;
}
return -1;
}
/**
* @see Iterate#forEachWith(Iterable, Procedure2, Object)
*/
public static void forEachWith(Iterator iterator, Procedure2 procedure, P parameter)
{
while (iterator.hasNext())
{
procedure.value(iterator.next(), parameter);
}
}
/**
* @see Iterate#collectWith(Iterable, Function2, Object, Collection)
*/
public static > R collectWith(
Iterator iterator,
Function2 function,
P parameter,
R targetCollection)
{
while (iterator.hasNext())
{
targetCollection.add(function.value(iterator.next(), parameter));
}
return targetCollection;
}
/**
* @see Iterate#groupBy(Iterable, Function)
*/
public static ImmutableMultimap groupBy(
Iterator iterator,
Function function)
{
return IteratorIterate.groupBy(iterator, function, new FastListMultimap()).toImmutable();
}
/**
* @see Iterate#groupBy(Iterable, Function, MutableMultimap)
*/
public static > R groupBy(
Iterator iterator,
Function function,
R target)
{
while (iterator.hasNext())
{
T item = iterator.next();
target.put(function.valueOf(item), item);
}
return target;
}
/**
* @see Iterate#groupByEach(Iterable, Function, MutableMultimap)
*/
public static > R groupByEach(
Iterator iterator,
Function> function,
R target)
{
while (iterator.hasNext())
{
T item = iterator.next();
Iterable iterable = function.valueOf(item);
for (V key : iterable)
{
target.put(key, item);
}
}
return target;
}
/**
* @see Iterate#groupByUniqueKey(Iterable, Function, MutableMap)
*/
public static > R groupByUniqueKey(
Iterator iterator,
Function function,
R target)
{
while (iterator.hasNext())
{
T value = iterator.next();
K key = function.valueOf(value);
if (target.put(key, value) != null)
{
throw new IllegalStateException("Key " + key + " already exists in map!");
}
}
return target;
}
/**
* @deprecated in 7.0.
*/
@Deprecated
public static > R distinct(
Iterator iterator,
R targetCollection)
{
Set seenSoFar = UnifiedSet.newSet();
while (iterator.hasNext())
{
T item = iterator.next();
if (seenSoFar.add(item))
{
targetCollection.add(item);
}
}
return targetCollection;
}
/**
* @since 7.0.
*/
public static MutableList distinct(Iterator iterator)
{
return IteratorIterate.distinct(iterator, FastList.newList());
}
/**
* @since 7.0.
*/
public static MutableList distinct(Iterator iterator, HashingStrategy hashingStrategy)
{
Set seenSoFar = UnifiedSetWithHashingStrategy.newSet(hashingStrategy);
FastList result = FastList.newList();
while (iterator.hasNext())
{
T item = iterator.next();
if (seenSoFar.add(item))
{
result.add(item);
}
}
return result;
}
/**
* @see Iterate#zip(Iterable, Iterable, Collection)
*/
public static >> R zip(
Iterator xs,
Iterator ys,
R target)
{
while (xs.hasNext() && ys.hasNext())
{
target.add(Tuples.pair(xs.next(), ys.next()));
}
return target;
}
/**
* @see Iterate#zipWithIndex(Iterable, Collection)
*/
public static >> R zipWithIndex(Iterator iterator, R target)
{
int index = 0;
while (iterator.hasNext())
{
target.add(Tuples.pair(iterator.next(), index));
index += 1;
}
return target;
}
/**
* @see Iterate#chunk(Iterable, int)
*/
public static RichIterable> chunk(Iterator iterator, int size)
{
if (size <= 0)
{
throw new IllegalArgumentException("Size for groups must be positive but was: " + size);
}
MutableList> result = Lists.mutable.empty();
while (iterator.hasNext())
{
MutableList batch = Lists.mutable.empty();
for (int i = 0; i < size && iterator.hasNext(); i++)
{
batch.add(iterator.next());
}
result.add(batch);
}
return result;
}
/**
* @see Iterate#min(Iterable, Comparator)
*/
public static T min(Iterator iterator, Comparator comparator)
{
T min = iterator.next();
while (iterator.hasNext())
{
T next = iterator.next();
if (comparator.compare(next, min) < 0)
{
min = next;
}
}
return min;
}
/**
* @see Iterate#max(Iterable, Comparator)
*/
public static T max(Iterator iterator, Comparator comparator)
{
T max = iterator.next();
while (iterator.hasNext())
{
T next = iterator.next();
if (comparator.compare(next, max) > 0)
{
max = next;
}
}
return max;
}
public static Iterator advanceIteratorTo(Iterator iterator, int from)
{
for (int i = 0; i < from; i++)
{
iterator.next();
}
return iterator;
}
public static long sumOfInt(Iterator iterator, IntFunction function)
{
long sum = 0L;
while (iterator.hasNext())
{
sum += (long) function.intValueOf(iterator.next());
}
return sum;
}
public static long sumOfLong(Iterator iterator, LongFunction function)
{
long sum = 0L;
while (iterator.hasNext())
{
sum += function.longValueOf(iterator.next());
}
return sum;
}
public static double sumOfFloat(Iterator iterator, FloatFunction function)
{
double sum = 0.0d;
double compensation = 0.0d;
while (iterator.hasNext())
{
double adjustedValue = (double) function.floatValueOf(iterator.next()) - compensation;
double nextSum = sum + adjustedValue;
compensation = nextSum - sum - adjustedValue;
sum = nextSum;
}
return sum;
}
public static double sumOfDouble(Iterator iterator, DoubleFunction function)
{
double sum = 0.0d;
double compensation = 0.0d;
while (iterator.hasNext())
{
double adjustedValue = function.doubleValueOf(iterator.next()) - compensation;
double nextSum = sum + adjustedValue;
compensation = nextSum - sum - adjustedValue;
sum = nextSum;
}
return sum;
}
public static BigDecimal sumOfBigDecimal(Iterator iterator, Function function)
{
BigDecimal result = BigDecimal.ZERO;
while (iterator.hasNext())
{
result = result.add(function.valueOf(iterator.next()));
}
return result;
}
public static BigInteger sumOfBigInteger(Iterator iterator, Function function)
{
BigInteger result = BigInteger.ZERO;
while (iterator.hasNext())
{
result = result.add(function.valueOf(iterator.next()));
}
return result;
}
public static MutableMap sumByBigDecimal(Iterator iterator, Function groupBy, final Function function)
{
MutableMap result = UnifiedMap.newMap();
while (iterator.hasNext())
{
final T item = iterator.next();
result.updateValue(groupBy.valueOf(item), Functions0.zeroBigDecimal(), new Function()
{
public BigDecimal valueOf(BigDecimal original)
{
return original.add(function.valueOf(item));
}
});
}
return result;
}
public static MutableMap sumByBigInteger(Iterator iterator, Function groupBy, final Function function)
{
MutableMap result = UnifiedMap.newMap();
while (iterator.hasNext())
{
final T item = iterator.next();
result.updateValue(groupBy.valueOf(item), Functions0.zeroBigInteger(), new Function()
{
public BigInteger valueOf(BigInteger original)
{
return original.add(function.valueOf(item));
}
});
}
return result;
}
public static MutableMap aggregateBy(
Iterator iterator,
Function groupBy,
Function0 zeroValueFactory,
Procedure2 mutatingAggregator)
{
MutableMap map = UnifiedMap.newMap();
IteratorIterate.forEach(iterator, new MutatingAggregationProcedure(map, groupBy, zeroValueFactory, mutatingAggregator));
return map;
}
public static MutableMap aggregateBy(
Iterator iterator,
Function groupBy,
Function0 zeroValueFactory,
Function2 nonMutatingAggregator)
{
MutableMap map = UnifiedMap.newMap();
IteratorIterate.forEach(iterator, new NonMutatingAggregationProcedure(map, groupBy, zeroValueFactory, nonMutatingAggregator));
return map;
}
public static > T minBy(Iterator iterator, Function function)
{
T min = iterator.next();
V minValue = function.valueOf(min);
while (iterator.hasNext())
{
T next = iterator.next();
V nextValue = function.valueOf(next);
if (nextValue.compareTo(minValue) < 0)
{
min = next;
minValue = nextValue;
}
}
return min;
}
public static > T maxBy(Iterator iterator, Function function)
{
T max = iterator.next();
V maxValue = function.valueOf(max);
while (iterator.hasNext())
{
T next = iterator.next();
V nextValue = function.valueOf(next);
if (nextValue.compareTo(maxValue) > 0)
{
max = next;
maxValue = nextValue;
}
}
return max;
}
}
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