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Java client for Appium Mobile Webdriver

There is a newer version: 9.3.0

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 * 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 io.appium.java_client.functions;

import com.google.common.base.Function;

import java.util.Objects;
import java.util.Optional;

/**
 * This is extended version of {@link com.google.common.base.Function}. It is combined
 * with {@link java.util.function.Function}. It was designed in order to provide compatibility
 * with the {@link org.openqa.selenium.support.ui.Wait}.
 *
 * @param  The input type
 * @param  The return type
 */
@FunctionalInterface
public interface AppiumFunction  extends Function, java.util.function.Function {

    @Override default  AppiumFunction compose(java.util.function.Function before) {
        Objects.requireNonNull(before);
        return (V v) -> {
            F f = before.apply(v);
            return Optional.ofNullable(f != null ? apply(f) : null).orElse(null);
        };
    }

    @Override default  AppiumFunction andThen(java.util.function.Function after) {
        Objects.requireNonNull(after);
        return (F f) -> {
            T result = apply(f);
            return Optional.ofNullable(result != null ? after.apply(result) : null).orElse(null);
        };
    }
}