/*
 * Copyright (c) 2002-2023 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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.neo4j.ogm.typeconversion;

import org.neo4j.ogm.utils.StringUtils;

/**
 * The NumberStringConverter can be used to convert any java object that extends
 * {@link java.lang.Number} to and from its String representation.
 * By default, the OGM will automatically convert {@link java.math.BigInteger}
 * and {@link java.math.BigDecimal} entity attributes using this converter.
 *
 * @author Vince Bickers
 * @author Gerrit Meier
 * @author Róbert Papp
 */
public class NumberStringConverter implements AttributeConverter<Number, String> {

    private final Class<? extends Number> numberClass;
    private final boolean lenient;

    public NumberStringConverter(Class<? extends Number> numberClass) {
        this.numberClass = numberClass;
        this.lenient = false;
    }

    public NumberStringConverter(Class<? extends Number> numberClass, boolean lenient) {
        this.numberClass = numberClass;
        this.lenient = lenient;
    }

    @Override
    public String toGraphProperty(Number value) {
        if (value == null) {
            return null;
        }
        return value.toString();
    }

    @Override
    public Number toEntityAttribute(String value) {
        if (value == null || (lenient && StringUtils.isBlank(value))) {
            return null;
        }
        try {
            return numberClass.getDeclaredConstructor(String.class).newInstance(value);
        } catch (Exception e) {
            throw new RuntimeException("Conversion failed!", e);
        }
    }
}
