/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.types.parser;
/**
* Parses a text field into a Double.
*/
public class DoubleParser extends FieldParser<Double> {
private static final Double DOUBLE_INSTANCE = Double.valueOf(0.0);
private double result;
@Override
public int parseField(byte[] bytes, int startPos, int limit, char delimiter, Double reusable) {
int i = startPos;
final byte delByte = (byte) delimiter;
while (i < limit && bytes[i] != delByte) {
i++;
}
String str = new String(bytes, startPos, i-startPos);
try {
this.result = Double.parseDouble(str);
return (i == limit) ? limit : i+1;
}
catch (NumberFormatException e) {
setErrorState(ParseErrorState.NUMERIC_VALUE_FORMAT_ERROR);
return -1;
}
}
@Override
public Double createValue() {
return DOUBLE_INSTANCE;
}
@Override
public Double getLastResult() {
return Double.valueOf(this.result);
}
/**
* Static utility to parse a field of type double from a byte sequence that represents text characters
* (such as when read from a file stream).
*
* @param bytes The bytes containing the text data that should be parsed.
* @param startPos The offset to start the parsing.
* @param length The length of the byte sequence (counting from the offset).
*
* @return The parsed value.
*
* @throws NumberFormatException Thrown when the value cannot be parsed because the text represents not a correct number.
*/
public static final double parseField(byte[] bytes, int startPos, int length) {
return parseField(bytes, startPos, length, (char) 0xffff);
}
/**
* Static utility to parse a field of type double from a byte sequence that represents text characters
* (such as when read from a file stream).
*
* @param bytes The bytes containing the text data that should be parsed.
* @param startPos The offset to start the parsing.
* @param length The length of the byte sequence (counting from the offset).
* @param delimiter The delimiter that terminates the field.
*
* @return The parsed value.
*
* @throws NumberFormatException Thrown when the value cannot be parsed because the text represents not a correct number.
*/
public static final double parseField(byte[] bytes, int startPos, int length, char delimiter) {
if (length <= 0) {
throw new NumberFormatException("Invalid input: Empty string");
}
int i = 0;
final byte delByte = (byte) delimiter;
while (i < length && bytes[i] != delByte) {
i++;
}
String str = new String(bytes, startPos, i);
return Double.parseDouble(str);
}
}