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/**
 * Copyright 2017 VMware, Inc.
 * 
 * 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
 * 

 * https://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.micrometer.spring.autoconfigure.export.properties;

import org.springframework.util.Assert;

import java.util.function.Function;
import java.util.function.Supplier;

/**
 * Base class for properties to config adapters.
 *
 * @param  The properties type
 * @author Phillip Webb
 * @author Nikolay Rybak
 */
public class PropertiesConfigAdapter {

    private T properties;

    /**
     * Create a new {@link PropertiesConfigAdapter} instance.
     *
     * @param properties the source properties
     */
    public PropertiesConfigAdapter(T properties) {
        Assert.notNull(properties, "Properties must not be null");
        this.properties = properties;
    }

    /**
     * Get the value from the properties or use a fallback from the {@code defaults}.
     *
     * @param getter   the getter for the properties
     * @param fallback the fallback method, usually super interface method reference
     * @param       the value type
     * @return the property or fallback value
     */
    protected final  V get(Function getter, Supplier fallback) {
        V value = getter.apply(properties);
        return (value != null ? value : fallback.get());
    }
}