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63 lines
1.8 KiB
63 lines
1.8 KiB
package com.woniu.builderdemo;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Consumer;
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import java.util.function.Supplier;
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/**
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* 通用的 Builder 模式构建器
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*
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*/
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public class Builder<T> {
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private final Supplier<T> instantiator;
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private List<Consumer<T>> modifiers = new ArrayList<>();
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public Builder(Supplier<T> instantiator) {
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this.instantiator = instantiator;
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}
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public static <T> Builder<T> of(Supplier<T> instantiator) {
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return new Builder<>(instantiator);
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}
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public <P1> Builder<T> with(Consumer1<T, P1> consumer, P1 p1) {
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Consumer<T> c = instance -> consumer.accept(instance, p1);
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modifiers.add(c);
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return this;
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}
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public <P1, P2> Builder<T> with(Consumer2<T, P1, P2> consumer, P1 p1, P2 p2) {
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Consumer<T> c = instance -> consumer.accept(instance, p1, p2);
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modifiers.add(c);
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return this;
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}
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public <P1, P2, P3> Builder<T> with(Consumer3<T, P1, P2, P3> consumer, P1 p1, P2 p2, P3 p3) {
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Consumer<T> c = instance -> consumer.accept(instance, p1, p2, p3);
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modifiers.add(c);
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return this;
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}
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public T build() {
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T value = instantiator.get();
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modifiers.forEach(modifier -> modifier.accept(value));
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modifiers.clear();
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return value;
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}
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/**
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* 1 参数 Consumer
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*/
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@FunctionalInterface
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public interface Consumer1<T, P1> {
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void accept(T t, P1 p1);
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}
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/**
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* 2 参数 Consumer
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*/
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@FunctionalInterface
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public interface Consumer2<T, P1, P2> {
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void accept(T t, P1 p1, P2 p2);
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}
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/**
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* 3 参数 Consumer
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*/
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@FunctionalInterface
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public interface Consumer3<T, P1, P2, P3> {
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void accept(T t, P1 p1, P2 p2, P3 p3);
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}
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}
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