com.yuehuanghun.mybatis.milu.tool.Streamable Maven / Gradle / Ivy

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A mybatis orm enhance framework.

There is a newer version: 1.18.0

/*
 * Copyright 2020-2022 the original author or authors.
 *
 * 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
 *
 *      https://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.yuehuanghun.mybatis.milu.tool;

import java.util.Arrays;
import java.util.Collections;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

/**
 * reference org.springframework.data.util.Streamable
 * 
 * @author yuehuanghun
 */
@FunctionalInterface
public interface Streamable extends Iterable {
	
	static  Streamable empty() {
		return Collections::emptyIterator;
	}

	@SafeVarargs
	static  Streamable of(T... t) {
		return () -> Arrays.asList(t).iterator();
	}

	static  Streamable of(Iterable iterable) {

		Assert.notNull(iterable, "Iterable must not be null!");

		return iterable::iterator;
	}

	static  Streamable of(Supplier> supplier) {
		return LazyStreamable.of(supplier);
	}

	default Stream stream() {
		return StreamSupport.stream(spliterator(), false);
	}

	default  Streamable map(Function mapper) {

		Assert.notNull(mapper, "Mapping function must not be null!");

		return Streamable.of(() -> stream().map(mapper));
	}

	default  Streamable flatMap(Function> mapper) {

		Assert.notNull(mapper, "Mapping function must not be null!");

		return Streamable.of(() -> stream().flatMap(mapper));
	}

	default Streamable filter(Predicate predicate) {

		Assert.notNull(predicate, "Filter predicate must not be null!");

		return Streamable.of(() -> stream().filter(predicate));
	}
}