/*
 * Copyright (c) nosqlbench
 *
 * 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 io.nosqlbench.virtdata.library.basics.shared.conversions.from_double;

import io.nosqlbench.virtdata.api.annotations.Categories;
import io.nosqlbench.virtdata.api.annotations.Category;
import io.nosqlbench.virtdata.api.annotations.Example;
import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;

import java.util.function.DoubleFunction;
import java.util.function.DoubleUnaryOperator;
import java.util.function.Function;

@Categories({Category.conversion})
@ThreadSafeMapper
public class ToString implements DoubleFunction<String> {
    private final DoubleUnaryOperator doubleFunc;

    @Example({"ToString()","map the double input value to a String"})
    public ToString() {
        doubleFunc = (d) -> d;
    }

    @Example({"ToString(Add(5.7D))","map the double input value X to X+5.7D and then to a String"})
    public ToString(DoubleUnaryOperator df) {
        this.doubleFunc = df;
    }

    public ToString(DoubleFunction<Double> df) {
        this.doubleFunc = df::apply;
    }

    public ToString(Function<Double,Double> df) {
        this.doubleFunc = df::apply;
    }

    public String apply(double v) {
        return String.valueOf(doubleFunc.applyAsDouble(v));
    }
}
