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Prelude.java
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Prelude.java
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/*
* Copyright 2010 Henry Coles
*
* 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.pitest.functional.prelude;
import java.io.PrintStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import org.pitest.functional.predicate.And;
import org.pitest.functional.predicate.Or;
/**
* @author henry
*
*/
public abstract class Prelude {
@SafeVarargs
public static <A> And<A> and(final Predicate<A>... ps) {
return new And<>(Arrays.asList(ps));
}
public static <A> And<A> and(final Iterable<? extends Predicate<A>> ps) {
return new And<>(ps);
}
public static <A> Predicate<A> not(final Predicate<A> p) {
return p.negate();
}
@SafeVarargs
public static <A> Or<A> or(final Predicate<A>... ps) {
return new Or<>(Arrays.asList(ps));
}
public static <A> Or<A> or(final Iterable<Predicate<A>> ps) {
return new Or<>(ps);
}
public static <A, B> Consumer<A> putToMap(final Map<A, B> map,
final B value) {
return key -> map.put(key, value);
}
public static <A> Function<A, A> id() {
return a -> a;
}
public static <A> Function<A, A> id(final Class<A> type) {
return id();
}
public static <T> Consumer<T> println() {
return printlnTo(System.out);
}
public static <T> Consumer<T> println(final Class<T> type) {
return println();
}
public static <T> Consumer<T> printlnTo(final Class<T> type,
final PrintStream stream) {
return printlnTo(stream);
}
public static <T> Consumer<T> printlnTo(final PrintStream stream) {
return stream::println;
}
public static <T> Consumer<T> printlnWith(final T t) {
return a -> System.out.println(t + " : " + a);
}
public static <T> Function<T, Iterable<T>> asList(final Class<T> type) {
return Collections::singletonList;
}
public static <T> Consumer<T> noSideEffect(final Class<T> clazz) {
return a -> {
};
}
}