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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 io.microsphere.util;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import static java.lang.Boolean.FALSE;
/**
* Fluent API for {@link FunctionalInterface} (No Thread-Safe)
*
* @param The type to be configured
* @author Mercy
* @since 1.0.0
*/
public class Functional {
private static final String UNNAMED = "UNNAMED";
private final String name;
private final V value;
private Boolean matched = null;
protected Functional(String name, V value) {
this.name = name;
this.value = value;
}
public Functional on(Predicate predicate) {
if (isSkip()) {
return this;
}
V value = this.value;
if (value != null) {
matched = predicate.test(value);
}
return this;
}
public Functional as(Function function) {
if (isSkip()) {
return (Functional) this;
}
final R result = function.apply(this.value);
return new Functional(this.name, result);
}
public void apply(Consumer valueConsumer) {
if (isSkip()) {
return;
}
valueConsumer.accept(value);
}
private boolean isSkip() {
return FALSE.equals(matched);
}
@Override
public String toString() {
return "Functional{" +
"name='" + name + '\'' +
", value=" + value +
", matched=" + matched +
'}';
}
public static Functional value(Supplier valueSupplier) {
return value(valueSupplier.get());
}
public static Functional value(V value) {
return of(UNNAMED, value);
}
public static Functional of(String name, Supplier valueSupplier) {
return of(name, valueSupplier.get());
}
public static Functional of(String name, V value) {
return new Functional<>(name, value);
}
}