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Java Bean api extends by Ultreia.io
There is a newer version: 0.3.3
package io.ultreia.java4all.bean;

/*-
 * #%L
 * Java Beans extends by Ultreia.io
 * %%
 * Copyright (C) 2018 Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;

import java.util.Objects;
import java.util.function.BiConsumer;
import java.util.function.Function;
import java.util.stream.Collectors;

public class AbstractJavaBeanDefinition implements JavaBeanDefinition {

    private final ImmutableSet> types;
    private final ImmutableMap getters;
    private final ImmutableMap setters;
    private final ImmutableSet copyPropertyNames;

    @SuppressWarnings("unchecked")
    public  AbstractJavaBeanDefinition(ImmutableSet> types, ImmutableMap> getters, ImmutableMap> setters) {
        this.types = types;
        this.getters = (ImmutableMap) getters;
        this.setters = (ImmutableMap) setters;
        copyPropertyNames = ImmutableSet.copyOf(this.getters.keySet().stream().filter(this.setters::containsKey).collect(Collectors.toSet()));
    }

    @Override
    public final ImmutableSet> types() {
        return types;
    }

    @Override
    public final ImmutableMap getters() {
        return getters;
    }

    @Override
    public final ImmutableMap setters() {
        return setters;
    }

    @Override
    public final ImmutableSet copyPropertyNames() {
        return copyPropertyNames;
    }

    @SuppressWarnings("unchecked")
    @Override
    public final  O get(JavaBean javaBean, String propertyName) {
        Function getter = Objects.requireNonNull(getters.get(propertyName), String.format("Can't find getter for property %s on %s", propertyName, javaBean.getClass().getName()));
        return (O) getter.apply(javaBean);
    }

    @SuppressWarnings("unchecked")
    @Override
    public final  void set(JavaBean javaBean, String propertyName, O propertyValue) {
        BiConsumer setter = Objects.requireNonNull(setters.get(propertyName), String.format("Can't find a setter for property: %s on %s", propertyName, javaBean.getClass().getName()));
        setter.accept(javaBean, propertyValue);
    }

    @Override
    public final void copy(JavaBean source, JavaBean target, String propertyName) {
        Object o = get(source, propertyName);
        set(target, propertyName, o);
    }

    @Override
    public final void copy(JavaBean source, JavaBean target) {
        for (String propertyName : copyPropertyNames) {
            copy(source, target, propertyName);
        }
    }

    @SuppressWarnings("unchecked")
    @Override
    public final void clear(JavaBean javaBean) {
        for (BiConsumer o : setters.values()) {
            try {
                o.accept(javaBean, null);
            } catch (Exception e) {
                o.accept(javaBean, 0);
            }
        }
    }

}