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rxjava2-extensions developed by David Karnok

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/*
 * Copyright 2016-2017 David Karnok
 *
 * 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 hu.akarnokd.rxjava2.joins;

import java.util.*;

import io.reactivex.Observable;
import io.reactivex.functions.Function;

/**
 * Represents a join pattern over observable sequences.
 */
public final class PatternN {
    private final List> observables;

    public PatternN(List> observables) {
        this.observables = observables;
    }

    public PatternN(List> observables, Observable other) {
        this.observables = new ArrayList>(observables);
        this.observables.add(other);
    }

    /**
     * @return the number of observables in this pattern.
     */
    int size() {
        return observables.size();
    }
    /**
     * Returns the specific Observable from this pattern.
     * @param index the index
     * @return the observable
     */
    Observable get(int index) {
        return observables.get(index);
    }

    /**
     * Creates a pattern that matches when all previous observable sequences have an available element.
     *
     * @param other
     *            Observable sequence to match with the previous sequences.
     * @return Pattern object that matches when all observable sequences have an available element.
     */
    public PatternN and(Observable other) {
        if (other == null) {
            throw new NullPointerException();
        }
        return new PatternN(observables, other);
    }

    /**
     * Matches when all observable sequences have an available
     * element and projects the elements by invoking the selector function.
     *
     * @param  the result type
     * @param selector
     *            the function that will be invoked for elements in the source sequences.
     * @return the plan for the matching
     * @throws NullPointerException
     *             if selector is null
     */
    public  Plan then(Function selector) {
        if (selector == null) {
            throw new NullPointerException();
        }
        return new PlanN(this, selector);
    }
}