Java tutorial
/* * Licensed to STRATIO (C) under one or more contributor license agreements. * See the NOTICE file distributed with this work for additional information * regarding copyright ownership. The STRATIO (C) 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 com.stratio.cassandra.lucene.schema.mapping; import com.stratio.cassandra.lucene.IndexException; import org.apache.cassandra.db.marshal.AsciiType; import org.apache.cassandra.db.marshal.DecimalType; import org.apache.cassandra.db.marshal.DoubleType; import org.apache.cassandra.db.marshal.FloatType; import org.apache.cassandra.db.marshal.Int32Type; import org.apache.cassandra.db.marshal.IntegerType; import org.apache.cassandra.db.marshal.LongType; import org.apache.cassandra.db.marshal.UTF8Type; import org.apache.commons.lang3.StringUtils; import java.math.BigDecimal; /** * A {@link Mapper} to map {@link BigDecimal} values. A max number of digits for the integer a decimal parts must be * specified. * * @author Andres de la Pena {@literal <adelapena@stratio.com>} */ public class BigDecimalMapper extends KeywordMapper { /** The default max number of digits for the integer part. */ public static final int DEFAULT_INTEGER_DIGITS = 32; /** The default max number of digits for the decimal part. */ public static final int DEFAULT_DECIMAL_DIGITS = 32; /** THe numeric base. */ private static final int BASE = 10; /** The max number of digits for the integer part. */ public final int integerDigits; /** The max number of digits for the decimal part. */ public final int decimalDigits; private final BigDecimal complement; /** * Builds a new {@link BigDecimalMapper} using the specified max number of digits for the integer and decimal * parts. * * @param field The name of the field. * @param column The name of the column to be mapped. * @param indexed If the field supports searching. * @param sorted If the field supports sorting. * @param integerDigits The max number of digits for the integer part. If {@code null}, the {@link * #DEFAULT_INTEGER_DIGITS} will be used. * @param decimalDigits The max number of digits for the decimal part. If {@code null}, the {@link * #DEFAULT_DECIMAL_DIGITS} will be used. */ public BigDecimalMapper(String field, String column, Boolean indexed, Boolean sorted, Integer integerDigits, Integer decimalDigits) { super(field, column, indexed, sorted, AsciiType.instance, UTF8Type.instance, Int32Type.instance, LongType.instance, IntegerType.instance, FloatType.instance, DoubleType.instance, DecimalType.instance); // Setup integer part mapping if (integerDigits != null && integerDigits <= 0) { throw new IndexException("Positive integer part digits required"); } this.integerDigits = integerDigits == null ? DEFAULT_INTEGER_DIGITS : integerDigits; // Setup decimal part mapping if (decimalDigits != null && decimalDigits <= 0) { throw new IndexException("Positive decimal part digits required"); } this.decimalDigits = decimalDigits == null ? DEFAULT_DECIMAL_DIGITS : decimalDigits; int totalDigits = this.integerDigits + this.decimalDigits; BigDecimal divisor = BigDecimal.valueOf(BASE).pow(this.decimalDigits); BigDecimal dividend = BigDecimal.valueOf(BASE).pow(totalDigits).subtract(BigDecimal.valueOf(1)); complement = dividend.divide(divisor); } /** {@inheritDoc} */ @Override protected String doBase(String name, Object value) { // Parse big decimal BigDecimal bd; try { bd = new BigDecimal(value.toString()); } catch (NumberFormatException e) { throw new IndexException("Field '%s' requires a base 10 decimal, but found '%s'", name, value); } // Split integer and decimal part bd = bd.stripTrailingZeros(); String[] parts = bd.toPlainString().split("\\."); validateIntegerPart(name, value, parts); validateDecimalPart(name, value, parts); BigDecimal complemented = bd.add(complement); String bds[] = complemented.toString().split("\\."); String integerPart = StringUtils.leftPad(bds[0], integerDigits + 1, '0'); String decimalPart = bds.length == 2 ? bds[1] : "0"; return integerPart + "." + decimalPart; } private void validateIntegerPart(String name, Object value, String[] parts) { String integerPart = parts[0]; if (integerPart.replaceFirst("-", "").length() > integerDigits) { throw new IndexException("Field '%s' with value '%s' has more than %d integer digits", name, value, integerDigits); } } private void validateDecimalPart(String name, Object value, String[] parts) { String decimalPart = parts.length == 1 ? "0" : parts[1]; if (decimalPart.length() > decimalDigits) { throw new IndexException("Field '%s' with value '%s' has more than %d decimal digits", name, value, decimalDigits); } } /** {@inheritDoc} */ @Override public String toString() { return toStringHelper(this).add("integerDigits", integerDigits).add("decimalDigits", decimalDigits) .toString(); } }