com.github.jcustenborder.kafka.connect.utils.config.recommenders.EnumRecommender.java Source code

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Here is the source code for com.github.jcustenborder.kafka.connect.utils.config.recommenders.EnumRecommender.java

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/**
 * Copyright  2016 Jeremy Custenborder (jcustenborder@gmail.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.github.jcustenborder.kafka.connect.utils.config.recommenders;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import org.apache.kafka.common.config.ConfigDef;

import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

class EnumRecommender implements ConfigDef.Recommender {
    final Set<String> validEnums;
    final Class<?> enumClass;
    final VisibleCallback visible;

    EnumRecommender(Class<?> enumClass, VisibleCallback visible, String... excludes) {
        Preconditions.checkNotNull(enumClass, "enumClass cannot be null");
        Preconditions.checkState(enumClass.isEnum(), "enumClass must be an enum.");
        Preconditions.checkNotNull(visible, "visible cannot be null");
        this.enumClass = enumClass;
        this.visible = visible;
        Set<String> validEnums = new LinkedHashSet<>();
        for (Object o : enumClass.getEnumConstants()) {
            String key = o.toString();
            validEnums.add(key);
        }
        validEnums.removeAll(Arrays.asList(excludes));
        this.validEnums = ImmutableSet.copyOf(validEnums);
    }

    @Override
    public List<Object> validValues(String s, Map<String, Object> map) {
        return ImmutableList.copyOf(this.validEnums);
    }

    @Override
    public boolean visible(String s, Map<String, Object> map) {
        return this.visible.visible(s, map);
    }
}