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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2017 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 org.wildfly.common.function;

import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.BiPredicate;
import java.util.function.Consumer;
import java.util.function.DoubleFunction;
import java.util.function.Function;
import java.util.function.IntFunction;
import java.util.function.LongFunction;
import java.util.function.ObjDoubleConsumer;
import java.util.function.ObjIntConsumer;
import java.util.function.ObjLongConsumer;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.function.ToDoubleBiFunction;
import java.util.function.ToDoubleFunction;
import java.util.function.ToIntBiFunction;
import java.util.function.ToIntFunction;
import java.util.function.ToLongBiFunction;
import java.util.function.ToLongFunction;

import org.jboss.logging.Logger;
import org.wildfly.common.Assert;

/**
 * A set of utility methods which return common functions.
 */
public final class Functions {
    private Functions() {}

    private static final Logger LOGGER = Logger.getLogger(Functions.class);

    private static final Consumer CLOSING_CONSUMER = quiet(AutoCloseable::close, exceptionLoggingConsumer());

    /**
     * Returns a consumer that quietly closes its argument, logging any exceptions.
     * @return a closing consumer
     */
    @SuppressWarnings("unchecked")
    public static  Consumer closingConsumer() {
        return (Consumer) CLOSING_CONSUMER;
    }

    private static final Consumer EXCEPTION_LOGGER = new Consumer() {
        @Override
        public void accept(Exception e) {
            LOGGER.warn(e.getLocalizedMessage(), e);
        }
    };

    /**
     * Returns a consumer that logs its exception parameter as a warning.
     * @param  the exception type
     * @return an exception consumer
     */
    @SuppressWarnings("unchecked")
    public static  Consumer exceptionLoggingConsumer() {
        return (Consumer) EXCEPTION_LOGGER;
    }

    /**
     * Returns a consumer that wraps and throws its exception parameter as a {@link RuntimeException}.
     * @param  the exception type
     * @return an exception consumer
     */
    public static  Consumer runtimeExceptionThrowingConsumer(Function runtimeExceptionWrapper) {
        return new Consumer() {
            @Override
            public void accept(E exception) {
                throw runtimeExceptionWrapper.apply(exception);
            }
        };
    }

    /**
     * Converts an {@link ExceptionConsumer} to a standard {@link Consumer} using the specified exception handler.
     * @param  the parameter type of the consumer
     * @param  the exception type
     * @param consumer an exception consumer
     * @param exceptionHandler an exception handler
     * @return a standard consumer
     */
    public static  Consumer quiet(ExceptionConsumer consumer, Consumer exceptionHandler) {
        return new Consumer() {
            @SuppressWarnings("unchecked")
            @Override
            public void accept(T value) {
                try {
                    consumer.accept(value);
                } catch (Exception e) {
                    exceptionHandler.accept((E) e);
                }
            }
        };
    }

    /**
     * Converts an {@link ExceptionBiConsumer} to a standard {@link BiConsumer} using the specified exception handler.
     * @param  the first parameter type of the consumer
     * @param  the second parameter type of the consumer
     * @param  the exception type
     * @param consumer a binary exception consumer
     * @param exceptionHandler an exception handler
     * @return a standard binary consumer
     */
    public static  BiConsumer quiet(ExceptionBiConsumer consumer, Consumer exceptionHandler) {
        return new BiConsumer() {
            @SuppressWarnings("unchecked")
            @Override
            public void accept(T value1, U value2) {
                try {
                    consumer.accept(value1, value2);
                } catch (Exception e) {
                    exceptionHandler.accept((E) e);
                }
            }
        };
    }

    /**
     * Converts an {@link ExceptionObjIntConsumer} to a standard {@link ObjIntConsumer} using the specified exception handler.
     * @param  the first parameter type of the consumer
     * @param  the exception type
     * @param consumer an object/int exception consumer
     * @param exceptionHandler an exception handler
     * @return a standard object/int consumer
     */
    public static  ObjIntConsumer quiet(ExceptionObjIntConsumer consumer, Consumer exceptionHandler) {
        return new ObjIntConsumer() {
            @SuppressWarnings("unchecked")
            @Override
            public void accept(T object, int i) {
                try {
                    consumer.accept(object, i);
                } catch (Exception e) {
                    exceptionHandler.accept((E) e);
                }
            }
        };
    }

    /**
     * Converts an {@link ExceptionObjLongConsumer} to a standard {@link ObjLongConsumer} using the specified exception handler.
     * @param  the first parameter type of the consumer
     * @param  the exception type
     * @param consumer an object/long exception consumer
     * @param exceptionHandler an exception handler
     * @return a standard object/long consumer
     */
    public static  ObjLongConsumer quiet(ExceptionObjLongConsumer consumer, Consumer exceptionHandler) {
        return new ObjLongConsumer() {
            @SuppressWarnings("unchecked")
            @Override
            public void accept(T object, long i) {
                try {
                    consumer.accept(object, i);
                } catch (Exception e) {
                    exceptionHandler.accept((E) e);
                }
            }
        };
    }

    /**
     * Get the singleton consumer which accepts and runs runnable instances.
     *
     * @return the runnable consumer
     */
    public static Consumer runnableConsumer() {
        return RunnableConsumer.INSTANCE;
    }

    /**
     * Get the singleton exception consumer which accepts and runs exception runnable instances.
     *
     * @param  the exception type
     * @return the runnable consumer
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionConsumer, E> exceptionRunnableConsumer() {
        return ExceptionRunnableConsumer.INSTANCE;
    }

    /**
     * Get the singleton exception consumer which accepts and runs runnable instances.
     *
     * @return the runnable consumer
     */
    public static ExceptionConsumer runnableExceptionConsumer() {
        return RunnableExceptionConsumer.INSTANCE;
    }

    /**
     * Get the singleton consumer which accepts a consumer and an argument to hand to it.
     *
     * @param  the argument type
     * @return the consumer
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  BiConsumer, T> consumerBiConsumer() {
        return ConsumerBiConsumer.INSTANCE;
    }

    /**
     * Get the singleton consumer which accepts a consumer and an argument to hand to it.
     *
     * @param  the argument type
     * @param  the exception type
     * @return the consumer
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionBiConsumer, T, E> exceptionConsumerBiConsumer() {
        return ExceptionConsumerBiConsumer.INSTANCE;
    }

    /**
     * Get the singleton consumer which accepts a consumer and an argument to hand to it.
     *
     * @param  the argument type
     * @return the consumer
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionBiConsumer, T, RuntimeException> consumerExceptionBiConsumer() {
        return ConsumerExceptionBiConsumer.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a supplier and returns the result of the supplier.
     *
     * @param  the result type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  Function, R> supplierFunction() {
        return SupplierFunction.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a supplier and returns the result of the supplier.
     *
     * @param  the result type
     * @param  the exception type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionFunction, R, E> exceptionSupplierFunction() {
        return ExceptionSupplierFunction.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a supplier and returns the result of the supplier.
     *
     * @param  the result type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionFunction, R, RuntimeException> supplierExceptionFunction() {
        return SupplierExceptionFunction.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a function which accepts a supplier, all of which return the result
     * of the supplier.
     *
     * @param  the result type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  BiFunction, R>, Supplier, R> supplierFunctionBiFunction() {
        return FunctionSupplierBiFunction.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a function which accepts a supplier, all of which return the result
     * of the supplier.
     *
     * @param  the result type
     * @param  the exception type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionBiFunction, R, E>, ExceptionSupplier, R, E> exceptionSupplierFunctionBiFunction() {
        return ExceptionFunctionSupplierBiFunction.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a function and a parameter to pass to the function, and returns the
     * result of the function.
     *
     * @param  the argument type
     * @param  the result type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  BiFunction, T, R> functionBiFunction() {
        return FunctionBiFunction.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a function and a parameter to pass to the function, and returns the
     * result of the function.
     *
     * @param  the argument type
     * @param  the result type
     * @param  the exception type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionBiFunction, T, R, E> exceptionFunctionBiFunction() {
        return ExceptionFunctionBiFunction.INSTANCE;
    }

    /**
     * Get the singleton function which accepts a function and a parameter to pass to the function, and returns the
     * result of the function.
     *
     * @param  the argument type
     * @param  the result type
     * @return the function
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionBiFunction, T, R, RuntimeException> functionExceptionBiFunction() {
        return FunctionExceptionBiFunction.INSTANCE;
    }

    /**
     * Get a supplier which always returns the same value.
     *
     * @param value the value to return
     * @param  the value type
     * @return the value supplier
     */
    @SuppressWarnings("unchecked")
    public static  Supplier constantSupplier(T value) {
        return value == null ? ConstantSupplier.NULL : new ConstantSupplier<>(value);
    }

    /**
     * Get a supplier which always returns the same value.
     *
     * @param value the value to return
     * @param  the value type
     * @param  the exception type
     * @return the value supplier
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static  ExceptionSupplier constantExceptionSupplier(T value) {
        return value == null ? ConstantSupplier.NULL : new ConstantSupplier(value);
    }

    /**
     * Get a runnable which executes the given consumer with captured values.
     *
     * @param consumer the consumer to run (must not be {@code null})
     * @param param1 the first parameter to pass
     * @param param2 the second parameter to pass
     * @param  the first parameter type
     * @param  the second parameter type
     * @return the capturing runnable
     */
    public static  Runnable capturingRunnable(BiConsumer consumer, T param1, U param2) {
        Assert.checkNotNullParam("consumer", consumer);
        return new BiConsumerRunnable(consumer, param1, param2);
    }

    /**
     * Get a runnable which executes the given consumer with captured values.
     *
     * @param consumer the consumer to run (must not be {@code null})
     * @param param the parameter to pass
     * @param  the parameter type
     * @return the capturing runnable
     */
    public static  Runnable capturingRunnable(Consumer consumer, T param) {
        Assert.checkNotNullParam("consumer", consumer);
        return new ConsumerRunnable(consumer, param);
    }

    /**
     * Get a runnable which executes the given consumer with captured values.
     *
     * @param consumer the consumer to run (must not be {@code null})
     * @param param1 the first parameter to pass
     * @param param2 the second parameter to pass
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the exception type
     * @return the capturing runnable
     */
    public static  ExceptionRunnable exceptionCapturingRunnable(ExceptionBiConsumer consumer, T param1, U param2) {
        Assert.checkNotNullParam("consumer", consumer);
        return new ExceptionBiConsumerRunnable(consumer, param1, param2);
    }

    /**
     * Get a runnable which executes the given consumer with captured values.
     *
     * @param consumer the consumer to run (must not be {@code null})
     * @param param the parameter to pass
     * @param  the parameter type
     * @param  the exception type
     * @return the capturing runnable
     */
    public static  ExceptionRunnable exceptionCapturingRunnable(ExceptionConsumer consumer, T param) {
        Assert.checkNotNullParam("consumer", consumer);
        return new ExceptionConsumerRunnable(consumer, param);
    }

    /**
     * Get a consumer which discards the values it is given.
     *
     * @param  the parameter type
     * @return the discarding consumer
     */
    @SuppressWarnings("unchecked")
    public static  Consumer discardingConsumer() {
        return DiscardingConsumer.INSTANCE;
    }

    /**
     * Get a consumer which discards the values it is given.
     *
     * @param  the parameter type
     * @param  the exception type
     * @return the discarding consumer
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionConsumer discardingExceptionConsumer() {
        return DiscardingConsumer.INSTANCE;
    }

    /**
     * Get a consumer which discards the values it is given.
     *
     * @param  the first parameter type
     * @param  the second parameter type
     * @return the discarding consumer
     */
    @SuppressWarnings("unchecked")
    public static  BiConsumer discardingBiConsumer() {
        return DiscardingBiConsumer.INSTANCE;
    }

    /**
     * Get a consumer which discards the values it is given.
     *
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the exception type
     * @return the discarding consumer
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionBiConsumer discardingExceptionBiConsumer() {
        return DiscardingBiConsumer.INSTANCE;
    }

    /**
     * Returns a {@link Consumer} with identical behavior to the specified {@link Consumer} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  Consumer cast(Consumer consumer) {
        return (Consumer) consumer;
    }

    /**
     * Returns a {@link Predicate} with identical behavior to the specified {@link Predicate} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param predicate a predicate
     * @return a functionally equivalent predicate
     */
    @SuppressWarnings("unchecked")
    public static  Predicate cast(Predicate predicate) {
        return (Predicate) predicate;
    }

    /**
     * Returns a {@link Supplier} with identical behavior to the specified {@link Supplier} but with relaxed return type.
     * @param  the return type
     * @param  the relaxed return type
     * @param supplier a supplier
     * @return a functionally equivalent supplier
     */
    @SuppressWarnings("unchecked")
    public static  Supplier cast(Supplier supplier) {
        return (Supplier) supplier;
    }

    /**
     * Returns a {@link Function} with identical behavior to the specified {@link Function} but with restricted parameter type and relaxed return type.
     * @param  the parameter type
     * @param  the return type
     * @param  the restricted parameter type
     * @param  the relaxed return type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  Function cast(Function function) {
        return (Function) function;
    }

    /**
     * Returns a {@link DoubleFunction} with identical behavior to the specified {@link DoubleFunction} but with relaxed return type.
     * @param  the return type
     * @param  the relaxed return type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  DoubleFunction cast(DoubleFunction function) {
        return (DoubleFunction) function;
    }

    /**
     * Returns a {@link IntFunction} with identical behavior to the specified {@link IntFunction} but with relaxed return type.
     * @param  the return type
     * @param  the relaxed return type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  IntFunction cast(IntFunction function) {
        return (IntFunction) function;
    }

    /**
     * Returns a {@link LongFunction} with identical behavior to the specified {@link LongFunction} but with relaxed return type.
     * @param  the return type
     * @param  the relaxed return type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  LongFunction cast(LongFunction function) {
        return (LongFunction) function;
    }

    /**
     * Returns a {@link ToDoubleFunction} with identical behavior to the specified {@link ToDoubleFunction} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ToDoubleFunction cast(ToDoubleFunction function) {
        return (ToDoubleFunction) function;
    }

    /**
     * Returns a {@link ToIntFunction} with identical behavior to the specified {@link ToIntFunction} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ToIntFunction cast(ToIntFunction function) {
        return (ToIntFunction) function;
    }

    /**
     * Returns a {@link ToLongFunction} with identical behavior to the specified {@link ToLongFunction} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ToLongFunction cast(ToLongFunction function) {
        return (ToLongFunction) function;
    }

    /**
     * Returns a {@link BiConsumer} with identical behavior to the specified {@link BiConsumer} but with restricted parameter types.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  BiConsumer cast(BiConsumer consumer) {
        return (BiConsumer) consumer;
    }

    /**
     * Returns a {@link ObjDoubleConsumer} with identical behavior to the specified {@link ObjDoubleConsumer} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  ObjDoubleConsumer cast(ObjDoubleConsumer consumer) {
        return (ObjDoubleConsumer) consumer;
    }

    /**
     * Returns a {@link ObjIntConsumer} with identical behavior to the specified {@link ObjIntConsumer} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  ObjIntConsumer cast(ObjIntConsumer consumer) {
        return (ObjIntConsumer) consumer;
    }

    /**
     * Returns a {@link ObjLongConsumer} with identical behavior to the specified {@link ObjLongConsumer} but with restricted parameter type.
     * @param  the parameter type
     * @param  the restricted parameter type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  ObjLongConsumer cast(ObjLongConsumer consumer) {
        return (ObjLongConsumer) consumer;
    }

    /**
     * Returns a {@link BiPredicate} with identical behavior to the specified {@link BiPredicate} but with restricted parameter types.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param predicate a predicate
     * @return a functionally equivalent predicate
     */
    @SuppressWarnings("unchecked")
    public static  BiPredicate cast(BiPredicate predicate) {
        return (BiPredicate) predicate;
    }

    /**
     * Returns a {@link BiFunction} with identical behavior to the specified {@link BiFunction} but with restricted parameter types and relaxed return type.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the return type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param  the relaxed return type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  BiFunction cast(BiFunction function) {
        return (BiFunction) function;
    }

    /**
     * Returns a {@link ToDoubleBiFunction} with identical behavior to the specified {@link ToDoubleBiFunction} but with restricted parameter types.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ToDoubleBiFunction cast(ToDoubleBiFunction function) {
        return (ToDoubleBiFunction) function;
    }

    /**
     * Returns a {@link ToIntBiFunction} with identical behavior to the specified {@link ToIntBiFunction} but with restricted parameter types.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ToIntBiFunction cast(ToIntBiFunction function) {
        return (ToIntBiFunction) function;
    }

    /**
     * Returns a {@link ToLongBiFunction} with identical behavior to the specified {@link ToLongBiFunction} but with restricted parameter types.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ToLongBiFunction cast(ToLongBiFunction function) {
        return (ToLongBiFunction) function;
    }

    /**
     * Returns a {@link ExceptionConsumer} with identical behavior to the specified {@link ExceptionConsumer} but with restricted parameter type and relaxed exception type.
     * @param  the parameter type
     * @param  the exception type
     * @param  the restricted parameter type
     * @param  the relaxed exception type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionConsumer cast(ExceptionConsumer consumer) {
        return (ExceptionConsumer) consumer;
    }

    /**
     * Returns a {@link ExceptionPredicate} with identical behavior to the specified {@link ExceptionPredicate} but with restricted parameter type and relaxed exception type.
     * @param  the parameter type
     * @param  the exception type
     * @param  the restricted parameter type
     * @param  the relaxed exception type
     * @param predicate a predicate
     * @return a functionally equivalent predicate
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionPredicate cast(ExceptionPredicate consumer) {
        return (ExceptionPredicate) consumer;
    }

    /**
     * Returns a {@link ExceptionSupplier} with identical behavior to the specified {@link ExceptionSupplier} but with relaxed return type and relaxed exception type.
     * @param  the return type
     * @param  the exception type
     * @param  the relaxed return type
     * @param  the relaxed exception type
     * @param supplier a supplier
     * @return a functionally equivalent supplier
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionSupplier cast(ExceptionSupplier supplier) {
        return (ExceptionSupplier) supplier;
    }

    /**
     * Returns a {@link ExceptionFunction} with identical behavior to the specified {@link ExceptionFunction} but with restricted parameter type, relaxed return type, and relaxed exception type.
     * @param  the parameter type
     * @param  the return type
     * @param  the exception type
     * @param  the restricted parameter type
     * @param  the relaxed return type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionFunction cast(ExceptionFunction function) {
        return (ExceptionFunction) function;
    }

    /**
     * Returns a {@link ExceptionIntFunction} with identical behavior to the specified {@link ExceptionFunction} but with relaxed return type and relaxed exception type.
     * @param  the return type
     * @param  the exception type
     * @param  the relaxed return type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionIntFunction cast(ExceptionIntFunction function) {
        return (ExceptionIntFunction) function;
    }

    /**
     * Returns a {@link ExceptionLongFunction} with identical behavior to the specified {@link ExceptionLongFunction} but with relaxed return type and relaxed exception type.
     * @param  the return type
     * @param  the exception type
     * @param  the relaxed return type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionLongFunction cast(ExceptionLongFunction function) {
        return (ExceptionLongFunction) function;
    }

    /**
     * Returns a {@link ExceptionToIntFunction} with identical behavior to the specified {@link ExceptionToIntFunction} but with restricted parameter type and relaxed exception type.
     * @param  the parameter type
     * @param  the exception type
     * @param  the restricted parameter type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionToIntFunction cast(ExceptionToIntFunction function) {
        return (ExceptionToIntFunction) function;
    }

    /**
     * Returns a {@link ExceptionToLongFunction} with identical behavior to the specified {@link ExceptionToLongFunction} but with restricted parameter type and relaxed exception type.
     * @param  the parameter type
     * @param  the exception type
     * @param  the restricted parameter type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionToLongFunction cast(ExceptionToLongFunction function) {
        return (ExceptionToLongFunction) function;
    }

    /**
     * Returns a {@link ExceptionBiConsumer} with identical behavior to the specified {@link ExceptionBiConsumer} but with restricted parameter types and relaxed exception type.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the exception type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param  the relaxed exception type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionBiConsumer cast(ExceptionBiConsumer consumer) {
        return (ExceptionBiConsumer) consumer;
    }

    /**
     * Returns a {@link ExceptionObjIntConsumer} with identical behavior to the specified {@link ExceptionObjIntConsumer} but with restricted parameter type and relaxed exception type.
     * @param  the parameter type
     * @param  the exception type
     * @param  the restricted parameter type
     * @param  the relaxed exception type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionObjIntConsumer cast(ExceptionObjIntConsumer consumer) {
        return (ExceptionObjIntConsumer) consumer;
    }

    /**
     * Returns a {@link ExceptionObjLongConsumer} with identical behavior to the specified {@link ExceptionObjLongConsumer} but with restricted parameter type and relaxed exception type.
     * @param  the parameter type
     * @param  the exception type
     * @param  the restricted parameter type
     * @param  the relaxed exception type
     * @param consumer a consumer
     * @return a functionally equivalent consumer
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionObjLongConsumer cast(ExceptionObjLongConsumer consumer) {
        return (ExceptionObjLongConsumer) consumer;
    }

    /**
     * Returns a {@link ExceptionBiPredicate} with identical behavior to the specified {@link ExceptionBiPredicate} but with restricted parameter types and relaxed exception type.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the exception type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param  the relaxed exception type
     * @param predicate a predicate
     * @return a functionally equivalent predicate
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionBiPredicate cast(ExceptionBiPredicate predicate) {
        return (ExceptionBiPredicate) predicate;
    }

    /**
     * Returns a {@link ExceptionBiFunction} with identical behavior to the specified {@link ExceptionBiFunction} but with restricted parameter types, relaxed return type, and relaxed exception type.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the return type
     * @param  the exception type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param  the relaxed return type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionBiFunction cast(ExceptionBiFunction function) {
        return (ExceptionBiFunction) function;
    }

    /**
     * Returns a {@link ExceptionToIntBiFunction} with identical behavior to the specified {@link ExceptionToIntBiFunction} but with restricted parameter types and relaxed exception type.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the exception type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionToIntBiFunction cast(ExceptionToIntBiFunction function) {
        return (ExceptionToIntBiFunction) function;
    }

    /**
     * Returns a {@link ExceptionToLongBiFunction} with identical behavior to the specified {@link ExceptionToLongBiFunction} but with restricted parameter types and relaxed exception type.
     * @param  the first parameter type
     * @param  the second parameter type
     * @param  the exception type
     * @param  the restricted first parameter type
     * @param  the restricted second parameter type
     * @param  the relaxed exception type
     * @param function a function
     * @return a functionally equivalent function
     */
    @SuppressWarnings("unchecked")
    public static  ExceptionToLongBiFunction cast(ExceptionToLongBiFunction function) {
        return (ExceptionToLongBiFunction) function;
    }

    static class RunnableConsumer implements Consumer {
        static final Consumer INSTANCE = new RunnableConsumer();

        private RunnableConsumer() {}

        public void accept(final Runnable runnable) {
            runnable.run();
        }
    }

    static class ExceptionRunnableConsumer implements ExceptionConsumer, E> {
        static final ExceptionConsumer INSTANCE = new ExceptionRunnableConsumer<>();

        private ExceptionRunnableConsumer() {}

        public void accept(final ExceptionRunnable ExceptionRunnable) throws E {
            ExceptionRunnable.run();
        }
    }

    static class RunnableExceptionConsumer implements ExceptionConsumer {
        static final RunnableExceptionConsumer INSTANCE = new RunnableExceptionConsumer();

        private RunnableExceptionConsumer() {}

        public void accept(final Runnable runnable) throws RuntimeException {
            runnable.run();
        }
    }

    static class ConsumerBiConsumer implements BiConsumer, Object> {
        static final BiConsumer INSTANCE = new ConsumerBiConsumer();

        private ConsumerBiConsumer() {}

        public void accept(final Consumer consumer, final Object o) {
            consumer.accept(o);
        }
    }

    static class ExceptionConsumerBiConsumer implements ExceptionBiConsumer, Object, E> {
        static final ExceptionBiConsumer INSTANCE = new ExceptionConsumerBiConsumer<>();

        private ExceptionConsumerBiConsumer() {}

        public void accept(final ExceptionConsumer consumer, final Object o) throws E {
            consumer.accept(o);
        }
    }

    static class ConsumerExceptionBiConsumer implements ExceptionBiConsumer, T, RuntimeException> {
        static final ExceptionBiConsumer INSTANCE = new ConsumerExceptionBiConsumer();

        private ConsumerExceptionBiConsumer() {}

        public void accept(final Consumer consumer, final T t) throws RuntimeException {
            consumer.accept(t);
        }
    }

    static class SupplierFunction implements Function, Object> {
        static final Function INSTANCE = new SupplierFunction();

        private SupplierFunction() {}

        public Object apply(final Supplier supplier) {
            return supplier.get();
        }
    }

    static class ExceptionSupplierFunction implements ExceptionFunction, Object, E> {
        static final ExceptionFunction INSTANCE = new ExceptionSupplierFunction<>();

        private ExceptionSupplierFunction() {}

        public Object apply(final ExceptionSupplier supplier) throws E {
            return supplier.get();
        }
    }

    static class SupplierExceptionFunction implements ExceptionFunction, R, RuntimeException> {
        static final SupplierExceptionFunction INSTANCE = new SupplierExceptionFunction();

        private SupplierExceptionFunction() {}

        public R apply(final Supplier supplier) throws RuntimeException {
            return supplier.get();
        }
    }

    static class FunctionSupplierBiFunction implements BiFunction, Object>, Supplier, Object> {
        static final BiFunction INSTANCE = new FunctionSupplierBiFunction();

        private FunctionSupplierBiFunction() {}

        public Object apply(final Function, Object> function, final Supplier supplier) {
            return function.apply(supplier);
        }
    }

    static class ExceptionFunctionSupplierBiFunction implements ExceptionBiFunction, Object, E>, ExceptionSupplier, Object, E> {
        static final ExceptionBiFunction INSTANCE = new ExceptionFunctionSupplierBiFunction();

        private ExceptionFunctionSupplierBiFunction() {}

        public Object apply(final ExceptionFunction, Object, E> function, final ExceptionSupplier supplier) throws E {
            return function.apply(supplier);
        }
    }

    static class FunctionExceptionBiFunction implements ExceptionBiFunction, T, R, RuntimeException> {
        static final FunctionExceptionBiFunction INSTANCE = new FunctionExceptionBiFunction();

        private FunctionExceptionBiFunction() {}

        public R apply(final Function function, final T t) throws RuntimeException {
            return function.apply(t);
        }
    }

    static class FunctionBiFunction implements BiFunction, T, R> {
        static final BiFunction INSTANCE = new FunctionBiFunction();

        private FunctionBiFunction() {
        }

        public R apply(final Function function, final T t) {
            return function.apply(t);
        }
    }

    static class ExceptionFunctionBiFunction implements ExceptionBiFunction, T, R, E> {
        static final ExceptionBiFunction INSTANCE = new ExceptionFunctionBiFunction();

        private ExceptionFunctionBiFunction() {
        }

        public R apply(final ExceptionFunction function, final T t) throws E {
            return function.apply(t);
        }
    }

    static class ConstantSupplier implements Supplier, ExceptionSupplier {
        static final ConstantSupplier NULL = new ConstantSupplier<>(null);

        private final T arg1;

        ConstantSupplier(final T arg1) {
            this.arg1 = arg1;
        }

        public T get() {
            return arg1;
        }

        public String toString() {
            return String.format("supplier(%s)", arg1);
        }
    }

    static class BiConsumerRunnable implements Runnable {
        private final BiConsumer consumer;
        private final T param1;
        private final U param2;

        BiConsumerRunnable(final BiConsumer consumer, final T param1, final U param2) {
            this.consumer = consumer;
            this.param1 = param1;
            this.param2 = param2;
        }

        public void run() {
            consumer.accept(param1, param2);
        }

        public String toString() {
            return String.format("%s(%s,%s)", consumer, param1, param2);
        }
    }

    static class ConsumerRunnable implements Runnable {
        private final Consumer consumer;
        private final T param;

        ConsumerRunnable(final Consumer consumer, final T param) {
            this.consumer = consumer;
            this.param = param;
        }

        public void run() {
            consumer.accept(param);
        }

        public String toString() {
            return String.format("%s(%s)", consumer, param);
        }
    }

    static class ExceptionBiConsumerRunnable implements ExceptionRunnable {
        private final ExceptionBiConsumer consumer;
        private final T param1;
        private final U param2;

        ExceptionBiConsumerRunnable(final ExceptionBiConsumer consumer, final T param1, final U param2) {
            this.consumer = consumer;
            this.param1 = param1;
            this.param2 = param2;
        }

        public void run() throws E {
            consumer.accept(param1, param2);
        }

        public String toString() {
            return String.format("%s(%s,%s)", consumer, param1, param2);
        }
    }

    static class ExceptionConsumerRunnable implements ExceptionRunnable {
        private final ExceptionConsumer consumer;
        private final T param;

        ExceptionConsumerRunnable(final ExceptionConsumer consumer, final T param) {
            this.consumer = consumer;
            this.param = param;
        }

        public void run() throws E {
            consumer.accept(param);
        }

        public String toString() {
            return String.format("%s(%s)", consumer, param);
        }
    }

    static class DiscardingConsumer implements Consumer, ExceptionConsumer {
        static final DiscardingConsumer INSTANCE = new DiscardingConsumer();

        private DiscardingConsumer() {
        }

        public void accept(final T t) {
        }
    }

    static class DiscardingBiConsumer implements BiConsumer, ExceptionBiConsumer {
        static final DiscardingBiConsumer INSTANCE = new DiscardingBiConsumer();

        private DiscardingBiConsumer() {
        }

        public void accept(final T t, final U u) {
        }
    }
}
    

    

    

            

    

            



    
    






    
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