io.ultreia.java4all.bean.AbstractJavaBeanStream Maven / Gradle / Ivy

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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 io.ultreia.java4all.bean.definition.JavaBeanDefinition;
import io.ultreia.java4all.bean.definition.JavaBeanDefinitionStore;

import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Stream;

/**
 * Created by tchemit on 11/01/2018.
 *
 * @author Tony Chemit - [email protected]
 */
public class AbstractJavaBeanStream> implements JavaBeanStream {

    private final JavaBeanDefinition javaBeanDefinition;
    private final List> predicates;
    private final List> comparators;
    private final Collection elements;

    public AbstractJavaBeanStream(JavaBeanDefinition javaBeanDefinition, Collection elements) {
        this.javaBeanDefinition = javaBeanDefinition;
        this.elements = elements;
        this.predicates = new LinkedList<>();
        this.comparators = new LinkedList<>();
    }

    protected AbstractJavaBeanStream(Class javaBeanDefinitionType, Collection elements) {
        this(JavaBeanDefinitionStore.definition(javaBeanDefinitionType), elements);
    }

    @Override
    public void addPredicate(Predicate predicate) {
        predicates.add(predicate);
    }

    @Override
    public Predicate predicate() {
        Iterator> iterator = predicates.iterator();
        if (!iterator.hasNext()) {
            return d -> true;
        }
        Predicate result = iterator.next();
        while (iterator.hasNext()) {
            result = result.and(iterator.next());
        }
        return result;
    }

    @Override
    public void addComparator(Comparator predicate) {
        comparators.add(predicate);
    }

    @Override
    public Optional> comparator() {
        Iterator> iterator = comparators.iterator();
        if (!iterator.hasNext()) {
            return Optional.empty();
        }
        Comparator result = iterator.next();
        while (iterator.hasNext()) {
            result = result.thenComparing(iterator.next());
        }
        return Optional.of(result);
    }

    @Override
    public Stream stream() {
        return elements.stream();
    }

    protected  ObjectQuery where(String propertyName) {
        return new ObjectQuery<>(p(), this.getter(propertyName));
    }

    protected > ComparableQuery whereComparable(String propertyName) {
        return new SimpleComparableQuery<>(p(), this.getter(propertyName));
    }

    protected > PrimitiveObjectQuery wherePrimitiveComparable(String propertyName) {
        return new PrimitiveObjectQuery<>(p(), this.getter(propertyName));
    }

    protected BooleanQuery whereBoolean(String propertyName) {
        return new BooleanQuery<>(p(), getter(propertyName));
    }

    protected PrimitiveBooleanQuery wherePrimitiveBoolean(String propertyName) {
        return new PrimitiveBooleanQuery<>(p(), getter(propertyName));
    }

    protected StringQuery whereString(String propertyName) {
        return new StringQuery<>(p(), getter(propertyName));
    }

    protected  Function getter(String propertyName) {
        return javaBeanDefinition.readProperty(propertyName).getter();
    }

    @SuppressWarnings("unchecked")
    protected P p() {
        return (P) this;
    }

}