lucene/luke/src/java/org/apache/lucene/luke/app/desktop/util/NumericUtils.java

/*
 * 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.lucene.luke.app.desktop.util;

import java.util.Arrays;

/** Utilities for handling numeric values */
public class NumericUtils {

  public static int[] convertToIntArray(String value, boolean ignoreException) throws NumberFormatException {
    if (StringUtils.isNullOrEmpty(value)) {
      return new int[]{0};
    }
    try {
      return Arrays.stream(value.trim().split(",")).mapToInt(Integer::parseInt).toArray();
    } catch (NumberFormatException e) {
      if (ignoreException) {
        return new int[]{0};
      } else {
        throw e;
      }
    }
  }

  public static long[] convertToLongArray(String value, boolean ignoreException) throws NumberFormatException {
    if (StringUtils.isNullOrEmpty(value)) {
      return new long[]{0};
    }
    try {
      return Arrays.stream(value.trim().split(",")).mapToLong(Long::parseLong).toArray();
    } catch (NumberFormatException e) {
      if (ignoreException) {
        return new long[]{0};
      } else {
        throw e;
      }
    }
  }

  public static float[] convertToFloatArray(String value, boolean ignoreException) throws NumberFormatException {
    if (StringUtils.isNullOrEmpty(value)) {
      return new float[]{0};
    }
    try {
      String[] strVals = value.trim().split(",");
      float[] values = new float[strVals.length];
      for (int i = 0; i < strVals.length; i++) {
        values[i] = Float.parseFloat(strVals[i]);
      }
      return values;
    } catch (NumberFormatException e) {
      if (ignoreException) {
        return new float[]{0};
      } else {
        throw e;
      }
    }
  }

  public static double[] convertToDoubleArray(String value, boolean ignoreException) throws NumberFormatException {
    if (StringUtils.isNullOrEmpty(value)) {
      return new double[]{0};
    }
    try {
      return Arrays.stream(value.trim().split(",")).mapToDouble(Double::parseDouble).toArray();
    } catch (NumberFormatException e) {
      if (ignoreException) {
        return new double[]{0};
      } else {
        throw e;
      }
    }
  }

  public static long tryConvertToLongValue(String value) throws NumberFormatException {
    try {
      // try parse to long
      return Long.parseLong(value.trim());
    } catch (NumberFormatException e) {
      // try parse to double
      double dvalue = Double.parseDouble(value.trim());
      return org.apache.lucene.util.NumericUtils.doubleToSortableLong(dvalue);
    }
  }

  private NumericUtils() {
  }
}