com.basistech.rosette.dm.jackson.DoubleSerializer Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of adm-json Show documentation

There is a newer version: 3.0.3

/*
 * Copyright 2017 Basis Technology Corp.
 *
 * 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.basistech.rosette.dm.jackson;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

import java.io.IOException;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;

public class DoubleSerializer extends StdSerializer {

    private final NumberFormat numberFormat;

    public DoubleSerializer() {
        super(Double.class);

        NumberFormat f = NumberFormat.getInstance(Locale.US);
        if (f instanceof DecimalFormat) {
            f.setMaximumFractionDigits(8);
        }
        f.setGroupingUsed(false);
        numberFormat = f;
    }

    /**
     * Method to serialize Double values in {@link com.basistech.rosette.dm.AnnotatedText} globally.
     *
     * @param value       Value to serialize; can not be null.
     * @param gen         Generator used to output resulting Json content
     * @param serializers Provider that can be used to get serializers for
     */
    @Override
    public void serialize(Double value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        // truncate to 8 digits below decimal for all Double fields.
        gen.writeNumber(Double.parseDouble(numberFormat.format(value)));
    }
}