gradle-master/subprojects/logging/src/main/java/org/gradle/internal/featurelifecycle/LoggingIncubatingFeatureHandler.java
/*
 * Copyright 2018 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.gradle.internal.featurelifecycle;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashSet;
import java.util.Set;

public class LoggingIncubatingFeatureHandler implements FeatureHandler<IncubatingFeatureUsage> {
    private static final String INCUBATION_MESSAGE = "%s is an incubating feature.";
    private static final Logger LOGGER = LoggerFactory.getLogger(LoggingIncubatingFeatureHandler.class);

    private final Set<String> features = new HashSet<String>();

    @Override
    public void featureUsed(IncubatingFeatureUsage usage) {
        if (features.add(usage.getSummary())) {
            LOGGER.warn(String.format(INCUBATION_MESSAGE, usage.getSummary()));
        }
    }

    public void reset() {
        features.clear();
    }
}
