functionalj.stream.longstream.LongStep Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of functionalj-core Show documentation
Show all versions of functionalj-core Show documentation
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.longstream;
import java.util.function.Function;
import java.util.function.LongFunction;
import java.util.function.LongUnaryOperator;
import functionalj.function.Func1;
import functionalj.list.longlist.LongFuncList;
import lombok.val;
public class LongStep implements LongUnaryOperator, LongFunction, Function, LongFuncList {
public static class Size {
public final long size;
Size(long size) {
if (size <= 0) {
throw new IllegalArgumentException("Step size cannot be zero or negative: " + size);
}
this.size = size;
}
}
public static class From {
public final long from;
From(long from) {
this.from = from;
}
public LongStep step(int size) {
return new LongStep(size, from);
}
}
public static class LongStepToStream implements LongStreamPlus {
private final boolean distancePositive;
private final long end;
private final LongStreamPlus longStreamPlus;
LongStepToStream(LongStreamPlus longStreamPlus, long end, boolean distancePositive) {
this.distancePositive = distancePositive;
this.end = end;
this.longStreamPlus = longStreamPlus;
}
public LongStreamPlus inclusive() {
if (distancePositive) {
return longStreamPlus.takeUntil(i -> i > end);
} else {
return longStreamPlus.takeUntil(i -> i < end);
}
}
@Override
public LongStreamPlus longStream() {
if (distancePositive) {
return longStreamPlus.takeUntil(i -> i >= end);
} else {
return longStreamPlus.takeUntil(i -> i <= end);
}
}
}
public static LongStep step(long size) {
return new LongStep(size, 0);
}
public static LongStep step(Size size) {
return new LongStep(size.size, 0);
}
public static LongStep step(Size size, From from) {
return new LongStep(size.size, from.from);
}
public static LongStep step(long size, From from) {
return new LongStep(size, from.from);
}
public static LongStep of(long size) {
return new LongStep(size, 0);
}
public static LongStep ofSize(long size) {
return new LongStep(size, 0);
}
public static LongStep of(Size size) {
return new LongStep(size.size, 0);
}
public static LongStep of(Size size, From from) {
return new LongStep(size.size, from.from);
}
public static LongStep of(long size, From from) {
return new LongStep(size, from.from);
}
public static Size size(long size) {
return new Size(size);
}
public static From StartFrom(long start) {
return new From(start);
}
public static From LongFrom(long start) {
return new From(start);
}
public static From from(long start) {
return new From(start);
}
private final long size;
private final long start;
private LongStep(long size, long start) {
if (size <= 0) {
throw new IllegalArgumentException("Step size cannot be zero or negative: " + size);
}
this.size = size;
this.start = start;
}
public LongStep startFrom(long start) {
return new LongStep(size, start);
}
public LongStepToStream to(long end) {
val sizePositive = size > 0;
val distancePositive = (end - start) > 0;
val sameDirection = sizePositive == distancePositive;
val longStreamPlus
= sameDirection
? LongStreamPlus.wholeNumbers().map(i -> i * size + start)
: LongStreamPlus.wholeNumbers().map(i -> -i * size + start);
return new LongStepToStream(longStreamPlus, end, distancePositive);
}
public LongStreamPlus longStream() {
return longStreamPlus();
}
@Override
public LongStreamPlus longStreamPlus() {
return LongStreamPlus.wholeNumbers().map(i -> i *size + start);
}
@Override
public long applyAsLong(long operand) {
return start + (long)(Math.round(1.0 * (operand - start) / size) * size);
}
@Override
public Long apply(long operand) {
return applyAsLong(operand);
}
@Override
public Long apply(Long operand) {
return applyAsLong(operand);
}
public Func1 function() {
return i -> applyAsLong(i);
}
@Override
public LongFuncList toLazy() {
return LongFuncList.from(() -> longStreamPlus());
}
/** Please don't call. This will blow up. */
@Override
public LongFuncList toEager() {
throw new UnsupportedOperationException(
"Infinite double step cannot be made an eager list: "
+ longStreamPlus().limit(5).join(", ") + "...");
}
/** Please don't call. This will blow up. */
@Override
public LongFuncList toCache() {
throw new UnsupportedOperationException(
"Infinite double step cannot be made a cache list: "
+ longStreamPlus().limit(5).join(", ") + "...");
}
}