org.feature4j.config.CompositeFeatureOverridesFactory.java Source code

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Here is the source code for org.feature4j.config.CompositeFeatureOverridesFactory.java

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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 org.feature4j.config;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import org.feature4j.FeatureOverride;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static com.google.common.base.Preconditions.checkNotNull;

public class CompositeFeatureOverridesFactory implements FeatureOverridesFactory {
    private final Iterable<FeatureOverridesFactory> featureOverridesFactories;

    public static CompositeFeatureOverridesFactory fromFactories(FeatureOverridesFactory... factories) {
        return fromIterable(Arrays.asList(factories));
    }

    public static CompositeFeatureOverridesFactory fromIterable(
            Iterable<FeatureOverridesFactory> featureOverridesFactories) {
        return new CompositeFeatureOverridesFactory(featureOverridesFactories);
    }

    CompositeFeatureOverridesFactory(Iterable<FeatureOverridesFactory> featureOverridesFactories) {
        this.featureOverridesFactories = ImmutableList
                .copyOf(checkNotNull(featureOverridesFactories, "featureOverridesFactories must be non-null"));
    }

    @Override
    public Iterable<FeatureOverride> createOverrides(FeatureConfiguration featureConfiguration) {
        List<FeatureOverride> allFeatureOverrides = new ArrayList<>();
        for (FeatureOverridesFactory factory : featureOverridesFactories) {
            Iterable<FeatureOverride> featureOverrides = factory.createOverrides(featureConfiguration);
            if (featureOverrides != null) {
                Iterables.addAll(allFeatureOverrides, featureOverrides);
            }
        }
        return allFeatureOverrides;
    }
}