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The module for FunctionalJ Core.
// ============================================================================
// Copyright (c) 2017-2021 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.stream;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.IntFunction;
import java.util.function.ToDoubleFunction;
import java.util.function.ToIntFunction;
import java.util.stream.Collectors;
import functionalj.function.ToByteFunction;
import functionalj.function.aggregator.Aggregation;
import functionalj.functions.StrFuncs;
import functionalj.list.FuncList;
import functionalj.list.ImmutableFuncList;
import functionalj.map.FuncMap;
import functionalj.map.ImmutableFuncMap;
import functionalj.stream.markers.Eager;
import functionalj.stream.markers.Terminal;
import lombok.val;
public interface AsStreamPlusWithConversion {
public StreamPlus streamPlus();
/** @return a iterator of this FuncList. */
public default IteratorPlus iterator() {
val streamPlus = streamPlus();
return streamPlus
.iterator();
}
/** @return a spliterator of this FuncList. */
public default Spliterator spliterator() {
val iterator = iterator();
return Spliterators
.spliteratorUnknownSize(iterator, 0);
}
/**
* @return a functional list containing the elements.
*
* Note: This method will materialize the elements and put in a list.
**/
@Eager
@Terminal
public default FuncList toFuncList() {
return FuncList.from(streamPlus());
}
//-- toArray --
@Eager
@Terminal
public default Object[] toArray() {
val streamPlus = streamPlus();
return streamPlus
.toArray();
}
@Eager
@Terminal
public default A[] toArray(IntFunction generator) {
val streamPlus = streamPlus();
return streamPlus
.toArray(generator);
}
//-- toArray --
/** Map the data to byte and return the byte array of all the results. */
@Eager
@Terminal
public default byte[] toByteArray(ToByteFunction toByte) {
val streamPlus = streamPlus();
val byteArray = new ByteArrayOutputStream();
streamPlus
.forEach(d -> {
byte b = toByte.apply(d);
byteArray.write(b);
});
return byteArray
.toByteArray();
}
/** Map the data to int and return the int array of all the results. */
@Eager
@Terminal
public default int[] toIntArray(ToIntFunction toInt) {
val streamPlus = streamPlus();
return streamPlus
.mapToInt(toInt)
.toArray ();
}
/** Map the data to double and return the byte array of all the results. */
@Eager
@Terminal
public default double[] toDoubleArray(ToDoubleFunction toDouble) {
val streamPlus = streamPlus();
return streamPlus
.mapToDouble(toDouble)
.toArray ();
}
//-- toList --
/** @return the array list containing the elements. */
@Eager
@Terminal
public default ArrayList toArrayList() {
val streamPlus = streamPlus();
val newList = new ArrayList();
streamPlus
.forEach(value -> newList.add(value));
return newList;
}
/** @return an immutable list containing the elements. */
@Eager
@Terminal
public default ImmutableFuncList toImmutableList() {
val streamPlus = streamPlus();
return ImmutableFuncList.from(streamPlus);
}
/** @return an Java list containing the elements. */
@Eager
@Terminal
public default List toJavaList() {
val streamPlus = streamPlus();
return streamPlus
.collect(Collectors.toList());
}
/** @return a list containing the elements. */
@Eager
@Terminal
public default FuncList toList() {
return toImmutableList();
}
/** @return a mutable list containing the elements. */
@Eager
@Terminal
public default List toMutableList() {
return toArrayList();
}
//-- join --
/** @return the concatenate of toString() of each elements. */
@Eager
@Terminal
public default String join() {
val streamPlus = streamPlus();
return streamPlus
.mapToObj(StrFuncs::toStr)
.collect (Collectors.joining());
}
/** @return the concatenate of toString() of each elements with the given delimiter. */
@Eager
@Terminal
public default String join(String delimiter) {
val streamPlus = streamPlus();
return streamPlus
.mapToObj(StrFuncs::toStr)
.collect (Collectors.joining(delimiter));
}
//-- toListString --
/** @return the to string as a list for this stream. */
@Eager
@Terminal
public default String toListString() {
val streamPlus = streamPlus();
val strValue
= streamPlus
.mapToObj(String::valueOf)
.collect (Collectors.joining(", "));
return "[" + strValue + "]";
}
//-- toMap --
/**
* Create a map from the data using the keyMapper.
* This method throw an exception with duplicate keys.
*/
@Eager
@Terminal
public default FuncMap toMap(Function keyMapper) {
val streamPlus = streamPlus();
val theMap = streamPlus.collect(Collectors.toMap(keyMapper, data -> data));
return ImmutableFuncMap.from(theMap);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* This method throw an exception with duplicate keys.
*/
@Eager
@Terminal
public default FuncMap toMap(
Function keyMapper,
Function valueMapper) {
val streamPlus = streamPlus();
val theMap = streamPlus.collect(Collectors.toMap(keyMapper, valueMapper));
return ImmutableFuncMap.from(theMap);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* When a value mapped to the same key, use the merge function to merge the value.
*/
@Eager
@Terminal
public default FuncMap toMap(
Function keyMapper,
Function valueMapper,
BinaryOperator mergeFunction) {
val streamPlus = streamPlus();
val theMap = streamPlus.collect(Collectors.toMap(keyMapper, valueMapper, mergeFunction));
return ImmutableFuncMap.from(theMap);
}
/**
* Create a map from the data using the keyMapper.
* When a value mapped to the same key, use the merge function to merge the value.
*/
@Eager
@Terminal
public default FuncMap toMap(
Function keyMapper,
BinaryOperator mergeFunction) {
val streamPlus = streamPlus();
val theMap = streamPlus.collect(Collectors.toMap(keyMapper, value -> value, mergeFunction));
return (FuncMap) ImmutableFuncMap.from(theMap);
}
/**
* Create a map from the data using the keyMapper.
* This method throw an exception with duplicate keys.
*/
@Eager
@Terminal
public default FuncMap toMap(Aggregation keyAggregation) {
val aggregator = keyAggregation.newAggregator();
return toMap(aggregator);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* This method throw an exception with duplicate keys.
*/
@Eager
@Terminal
public default FuncMap toMap(
Aggregation keyAggregation,
Function valueMapper) {
val keyAggregator = keyAggregation.newAggregator();
return toMap(keyAggregator, valueMapper);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* This method throw an exception with duplicate keys.
*/
@Eager
@Terminal
public default FuncMap toMap(
Function keyMapper,
Aggregation valueAggregation) {
val valueAggregator = valueAggregation.newAggregator();
return toMap(keyMapper, valueAggregator);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* This method throw an exception with duplicate keys.
*/
@Eager
@Terminal
public default FuncMap toMap(
Aggregation keyAggregation,
Aggregation valueAggregation) {
val keyAggregator = keyAggregation.newAggregator();
val valueAggregator = valueAggregation.newAggregator();
return toMap(keyAggregator, valueAggregator);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* When a value mapped to the same key, use the merge function to merge the value.
*/
@Eager
@Terminal
public default FuncMap toMap(
Aggregation keyAggregation,
Function valueMapper,
BinaryOperator mergeFunction) {
val keyAggregator = keyAggregation.newAggregator();
return toMap(keyAggregator, valueMapper, mergeFunction);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* When a value mapped to the same key, use the merge function to merge the value.
*/
@Eager
@Terminal
public default FuncMap toMap(
Function keyMapper,
Aggregation valueAggregation,
BinaryOperator mergeFunction) {
val valueAggregator = valueAggregation.newAggregator();
return toMap(keyMapper, valueAggregator, mergeFunction);
}
/**
* Create a map from the data using the keyMapper and the valueMapper.
* When a value mapped to the same key, use the merge function to merge the value.
*/
@Eager
@Terminal
public default FuncMap toMap(
Aggregation keyAggregation,
Aggregation valueAggregation,
BinaryOperator mergeFunction) {
val keyAggregator = keyAggregation.newAggregator();
val valueAggregator = valueAggregation.newAggregator();
return toMap(keyAggregator, valueAggregator, mergeFunction);
}
/**
* Create a map from the data using the keyMapper.
* When a value mapped to the same key, use the merge function to merge the value.
*/
@Eager
@Terminal
public default FuncMap toMap(
Aggregation keyAggregation,
BinaryOperator mergeFunction) {
val keyAggregator = keyAggregation.newAggregator();
return toMap(keyAggregator, mergeFunction);
}
//-- toSet --
/** @return a set of the elements. */
@Eager
@Terminal
public default Set toSet() {
val streamPlus = streamPlus();
return streamPlus.collect(Collectors.toSet());
}
}