/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.skywalking.apm.collector.core.util;

import java.math.RoundingMode;
import java.text.NumberFormat;

/**
 * @author peng-yongsheng
 */
public class NumberFormatUtils {

    public static Double rateNumberFormat(Double rate) {
        NumberFormat rateNumberFormat = NumberFormat.getNumberInstance();
        rateNumberFormat.setMaximumFractionDigits(2);
        rateNumberFormat.setRoundingMode(RoundingMode.HALF_UP);
        Double formattedRate = Double.valueOf(rateNumberFormat.format(rate));
        return Double.valueOf(formattedRate);
    }
}

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.skywalking.apm.collector.core.util;

import java.math.RoundingMode;
import java.text.DecimalFormat;

/**
 * @author peng-yongsheng
 */
public class NumberFormatUtils {

    public static Double rateNumberFormat(Double rate) {
        DecimalFormat decimalFormat = new DecimalFormat("#.00");
        decimalFormat.setRoundingMode(RoundingMode.HALF_UP);
        Double formattedRate = Double.valueOf(decimalFormat.format(rate));
        return Double.valueOf(formattedRate);
    }
}

Use DecimalFormat to replace DecimalFormat because of DecimalFormat will add a comma in formatted result when value greater than 1000.