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/*
* 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.*;
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 }
*/
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 validated If the field must be validated.
* @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,
Boolean validated,
Integer integerDigits,
Integer decimalDigits) {
super(field,
column,
indexed,
sorted,
validated,
ByteType.instance,
DecimalType.instance,
DoubleType.instance,
FloatType.instance,
IntegerType.instance,
Int32Type.instance,
LongType.instance,
ShortType.instance,
UTF8Type.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();
}
}
