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Celerio Core Generation Engine

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/*
 * Copyright 2015 JAXIO http://www.jaxio.com
 *
 * 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.
 */

package com.jaxio.celerio.util.support;

import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.jaxio.celerio.util.Named;

import static com.google.common.collect.Iterables.filter;

/**
 * A list holder whose underlying List is built out of an Iterable and a predicate.
 */
public class SimpleListHolder extends AbstractListHolder {
    private Iterable original;
    private Predicate filter;

    public SimpleListHolder(Iterable original) {
        assert original != null;
        this.original = original;
        this.filter = Predicates.alwaysTrue(); // using static import breaks compilation
    }

    public SimpleListHolder(Iterable original, Predicate filter) {
        assert original != null;
        assert filter != null;
        this.original = original;
        this.filter = filter;
    }

    public SimpleListHolder(Iterable original, Predicate filter, String sortProperty) {
        this(original, filter);
        setSortProperty(sortProperty);
    }

    @Override
    protected Iterable getIterable() {
        return filter(original, filter);
    }
}