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eu.lunisolar.magma.func.supplier.LSupplier Maven / Gradle / Ivy
/*
* This file is part of "lunisolar-magma".
*
* (C) Copyright 2014-2019 Lunisolar (http://lunisolar.eu/).
*
* 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 eu.lunisolar.magma.func.supplier;
import javax.annotation.Nonnull; // NOSONAR
import javax.annotation.Nullable; // NOSONAR
import java.util.Objects; // NOSONAR
import eu.lunisolar.magma.basics.*; // NOSONAR
import eu.lunisolar.magma.basics.builder.*; // NOSONAR
import eu.lunisolar.magma.basics.exceptions.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.aType.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.functional.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.functional.type.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.functional.domain.*; // NOSONAR
import eu.lunisolar.magma.func.IA;
import eu.lunisolar.magma.func.SA;
import eu.lunisolar.magma.func.*; // NOSONAR
import eu.lunisolar.magma.func.tuple.*; // NOSONAR
import java.util.function.*; // NOSONAR
import java.util.*;
import eu.lunisolar.magma.func.action.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.bi.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.obj.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.tri.*; // NOSONAR
import eu.lunisolar.magma.func.function.*; // NOSONAR
import eu.lunisolar.magma.func.function.conversion.*; // NOSONAR
import eu.lunisolar.magma.func.function.from.*; // NOSONAR
import eu.lunisolar.magma.func.function.to.*; // NOSONAR
import eu.lunisolar.magma.func.operator.binary.*; // NOSONAR
import eu.lunisolar.magma.func.operator.ternary.*; // NOSONAR
import eu.lunisolar.magma.func.operator.unary.*; // NOSONAR
import eu.lunisolar.magma.func.predicate.*; // NOSONAR
import eu.lunisolar.magma.func.supplier.*; // NOSONAR
/**
* Non-throwing functional interface (lambda) LSupplier for Java 8.
*
* Type: supplier
*
* Domain (lvl: 0): none
*
* Co-domain: T
*
*/
@FunctionalInterface
@SuppressWarnings("UnusedDeclaration")
public interface LSupplier extends Supplier, MetaSupplier, MetaInterface.NonThrowing, Codomain>, Domain0 { // NOSONAR
String DESCRIPTION = "LSupplier: T get()";
@Nullable
// T get() ;
default T get() {
// return nestingGet();
try {
return this.getX();
} catch (Throwable e) { // NOSONAR
throw Handling.nestCheckedAndThrow(e);
}
}
/**
* Implement this, but call get()
*/
T getX() throws Throwable;
default T tupleGet(LTuple.Void args) {
return get();
}
/** Function call that handles exceptions according to the instructions. */
default T handlingGet(HandlingInstructions handling) {
try {
return this.getX();
} catch (Throwable e) { // NOSONAR
throw Handler.handleOrNest(e, handling);
}
}
default LSupplier handling(HandlingInstructions handling) {
return () -> handlingGet(handling);
}
default T get(@Nonnull ExWMF exF, @Nonnull String newMessage, @Nullable Object... messageParams) {
try {
return this.getX();
} catch (Throwable e) { // NOSONAR
throw Handling.wrap(e, exF, newMessage, messageParams);
}
}
default LSupplier trying(@Nonnull ExWMF exF, @Nonnull String newMessage, @Nullable Object... messageParams) {
return () -> get(exF, newMessage, messageParams);
}
default T get(@Nonnull ExWF exF) {
try {
return this.getX();
} catch (Throwable e) { // NOSONAR
throw Handling.wrap(e, exF);
}
}
default LSupplier trying(@Nonnull ExWF exF) {
return () -> get(exF);
}
default T getThen(@Nonnull LFunction handler) {
try {
return this.getX();
} catch (Throwable e) { // NOSONAR
Handling.handleErrors(e);
return handler.apply(e);
}
}
default LSupplier tryingThen(@Nonnull LFunction handler) {
return () -> getThen(handler);
}
/** Function call that handles exceptions by always nesting checked exceptions and propagating the others as is. */
default T nestingGet() {
try {
return this.getX();
} catch (Throwable e) { // NOSONAR
throw Handling.nestCheckedAndThrow(e);
}
}
/** Function call that handles exceptions by always propagating them as is, even when they are undeclared checked ones. */
default T shovingGet() {
try {
return this.getX();
} catch (Throwable e) { // NOSONAR
throw Handling.shoveIt(e);
}
}
static T handlingGet(LSupplier func, HandlingInstructions handling) { // <-
Null.nonNullArg(func, "func");
return func.handlingGet(handling);
}
static T tryGet(LSupplier func) {
Null.nonNullArg(func, "func");
return func.nestingGet();
}
static T tryGet(LSupplier func, @Nonnull ExWMF exF, @Nonnull String newMessage, @Nullable Object... messageParams) {
Null.nonNullArg(func, "func");
return func.get(exF, newMessage, messageParams);
}
static T tryGet(LSupplier func, @Nonnull ExWF exF) {
Null.nonNullArg(func, "func");
return func.get(exF);
}
static T tryGetThen(LSupplier func, @Nonnull LFunction handler) {
Null.nonNullArg(func, "func");
return func.getThen(handler);
}
default T failSafeGet(@Nonnull LSupplier failSafe) {
try {
return get();
} catch (Throwable e) { // NOSONAR
Handling.handleErrors(e);
return failSafe.get();
}
}
static T failSafeGet(LSupplier func, @Nonnull LSupplier failSafe) {
Null.nonNullArg(failSafe, "failSafe");
if (func == null) {
return failSafe.get();
} else {
return func.failSafeGet(failSafe);
}
}
static LSupplier failSafe(LSupplier func, @Nonnull LSupplier failSafe) {
Null.nonNullArg(failSafe, "failSafe");
return () -> failSafeGet(func, failSafe);
}
LSupplier NULL_VALUE_MESSAGE_SUPPLIER = () -> "Evaluated value by nonNullGet() method cannot be null (" + DESCRIPTION + ").";
/** Function call that ensures the result is not null */
@Nonnull
default T nonNullGet() {
return Null.requireNonNull(get(), NULL_VALUE_MESSAGE_SUPPLIER);
}
/** Returns description of the functional interface. */
@Nonnull
default String functionalInterfaceDescription() {
return LSupplier.DESCRIPTION;
}
/** From-To. Intended to be used with non-capturing lambda. */
public static void fromTo(int min_i, int max_i, LSupplier func) {
Null.nonNullArg(func, "func");
if (min_i <= max_i) {
for (int i = min_i; i <= max_i; i++) {
func.get();
}
} else {
for (int i = min_i; i >= max_i; i--) {
func.get();
}
}
}
/** From-To. Intended to be used with non-capturing lambda. */
public static void fromTill(int min_i, int max_i, LSupplier func) {
Null.nonNullArg(func, "func");
if (min_i <= max_i) {
for (int i = min_i; i < max_i; i++) {
func.get();
}
} else {
for (int i = min_i; i > max_i; i--) {
func.get();
}
}
}
/** From-To. Intended to be used with non-capturing lambda. */
public static void times(int max_i, LSupplier func) {
if (max_i < 0)
return;
fromTill(0, max_i, func);
}
/** Cast that removes generics. */
public default LSupplier untyped() {
return this;
}
/** Cast that replace generics. */
public default LSupplier cast() {
return untyped();
}
/** Cast that replace generics. */
public static LSupplier cast(LSupplier function) {
return (LSupplier) function;
}
/** Creates function that always returns the same value. */
static LSupplier of(T r) {
return () -> r;
}
/** Convenient method in case lambda expression is ambiguous for the compiler (that might happen for overloaded methods accepting different interfaces). */
@Nonnull
static LSupplier sup(final @Nonnull LSupplier lambda) {
Null.nonNullArg(lambda, "lambda");
return lambda;
}
@Nonnull
static LSupplier recursive(final @Nonnull LFunction, LSupplier> selfLambda) {
final LSupplierSingle single = new LSupplierSingle();
LSupplier func = selfLambda.apply(single);
single.target = func;
return func;
}
final class LSupplierSingle implements LSingle>, LSupplier {
private LSupplier target = null;
@Override
public T getX() throws Throwable {
return target.getX();
}
@Override
public LSupplier value() {
return target;
}
}
@Nonnull
static LSupplier supThrowing(final @Nonnull ExF exF) {
Null.nonNullArg(exF, "exF");
return () -> {
throw exF.produce();
};
}
@Nonnull
static LSupplier supThrowing(final String message, final @Nonnull ExMF exF) {
Null.nonNullArg(exF, "exF");
return () -> {
throw exF.produce(message);
};
}
static T call(final @Nonnull LSupplier lambda) {
Null.nonNullArg(lambda, "lambda");
return lambda.get();
}
//
/** Wraps JRE instance. */
@Nonnull
static LSupplier wrap(final Supplier other) {
return other::get;
}
//
//
/** Safe instance. That always returns the same value (as produce). */
@Nonnull
static LSupplier safe() {
return LSupplier::produce;
}
/** Safe instance supplier. Returns supplier of safe() instance. */
@Nonnull
static LSupplier> safeSupplier() {
return () -> safe();
}
/** Safe wrapping. Either argument function is returned (if it is not null) or safe() instance. */
@Nonnull
static LSupplier safe(final @Nullable LSupplier other) {
if (other == null) {
return safe();
} else {
return other;
}
}
/** Safe supplier. Either argument supplier is returned (if it is not null) or supplier of safe() instance. */
@Nonnull
static LSupplier> safeSupplier(final @Nullable LSupplier> supplier) {
if (supplier == null) {
return safeSupplier();
} else {
return supplier;
}
}
//
//
/** Combines two functions together in a order. */
@Nonnull
default LSupplier toSup(@Nonnull LFunction after) {
Null.nonNullArg(after, "after");
return () -> after.apply(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LAction toAct(@Nonnull LConsumer after) {
Null.nonNullArg(after, "after");
return () -> after.accept(this.get());
}
@Nonnull
default LSupplier before(@Nonnull LAction before) {
Null.nonNullArg(before, "before");
return () -> {
before.execute();
return this.get();
};
}
@Nonnull
default LSupplier after(@Nonnull LConsumer after) {
Null.nonNullArg(after, "after");
return () -> {
T result = this.get();
after.accept(result);
return result;
};
}
/** Combines two functions together in a order. */
@Nonnull
default LByteSupplier toByteSup(@Nonnull LToByteFunction after) {
Null.nonNullArg(after, "after");
return () -> after.applyAsByte(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LSrtSupplier toSrtSup(@Nonnull LToSrtFunction after) {
Null.nonNullArg(after, "after");
return () -> after.applyAsSrt(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LIntSupplier toIntSup(@Nonnull LToIntFunction after) {
Null.nonNullArg(after, "after");
return () -> after.applyAsInt(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LLongSupplier toLongSup(@Nonnull LToLongFunction after) {
Null.nonNullArg(after, "after");
return () -> after.applyAsLong(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LFltSupplier toFltSup(@Nonnull LToFltFunction after) {
Null.nonNullArg(after, "after");
return () -> after.applyAsFlt(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LDblSupplier toDblSup(@Nonnull LToDblFunction after) {
Null.nonNullArg(after, "after");
return () -> after.applyAsDbl(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LCharSupplier toCharSup(@Nonnull LToCharFunction after) {
Null.nonNullArg(after, "after");
return () -> after.applyAsChar(this.get());
}
/** Combines two functions together in a order. */
@Nonnull
default LBoolSupplier toBoolSup(@Nonnull LPredicate after) {
Null.nonNullArg(after, "after");
return () -> after.test(this.get());
}
//
//
//
/** Converts to function that makes sure that the result is not null. */
@Nonnull
default LSupplier nonNullable() {
return this::nonNullGet;
}
/** Does nothing (LSupplier) Supplier */
public static T produce() {
return (T) Function4U.defaultObject;
}
}
