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Library which provides meta-model, diffs, paths... for java beans

There is a newer version: 0.0.4

/*-
 * #%L
 * codegeny-beans
 * %%
 * Copyright (C) 2016 - 2018 Codegeny
 * %%
 * 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.
 * #L%
 */
package org.codegeny.beans.model;

import java.util.Set;
import java.util.function.Function;

import static java.util.Collections.emptySet;
import static java.util.Objects.requireNonNull;

/**
 * An implementation of {@link Model} for a set.
 *
 * @param  The type of the set.
 * @param  The type of the element.
 * @author Xavier DURY
 */
public final class SetModel implements Model {

    private final Model elementModel;
    private final Function> extractor;

    SetModel(Function> extractor, Model elementModel) {
        this.extractor = requireNonNull(extractor);
        this.elementModel = requireNonNull(elementModel);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public  R accept(ModelVisitor visitor) {
        return requireNonNull(visitor).visitSet(this);
    }

    /**
     * Visit the element model.
     *
     * @param visitor The visitor.
     * @param      The result type.
     * @return A result of type <R>.
     */
    public  R acceptElement(ModelVisitor visitor) {
        return elementModel.accept(visitor);
    }

    /**
     * Transform a set of type <S> to Set<E>
     *
     * @param values The values.
     * @return A set of elements.
     */
    public Set toSet(S values) {
        return values == null ? emptySet() : extractor.apply(values);
    }

    /**
     * Get the element model.
     *
     * @return The element model.
     */
    public Model getElementModel() {
        return elementModel;
    }
}