/***********************************************************************************************************************
* 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;
import eu.stratosphere.types.ShortValue;
/**
* Parses a decimal text field into a {@link ShortValue}.
* Only characters '1' to '0' and '-' are allowed.
*/
public class DecimalTextShortParser extends FieldParser<ShortValue> {
private static final int OVERFLOW_BOUND = 0x7fff;
private static final int UNDERFLOW_BOUND = 0x8000;
private ShortValue result;
@Override
public int parseField(byte[] bytes, int startPos, int limit, char delimiter, ShortValue reusable) {
int val = 0;
boolean neg = false;
this.result = reusable;
if (bytes[startPos] == '-') {
neg = true;
startPos++;
// check for empty field with only the sign
if (startPos == limit || bytes[startPos] == delimiter) {
setErrorState(ParseErrorState.NUMERIC_VALUE_ORPHAN_SIGN);
return -1;
}
}
for (int i = startPos; i < limit; i++) {
if (bytes[i] == delimiter) {
reusable.setValue((short) (neg ? -val : val));
return i+1;
}
if (bytes[i] < 48 || bytes[i] > 57) {
setErrorState(ParseErrorState.NUMERIC_VALUE_ILLEGAL_CHARACTER);
return -1;
}
val *= 10;
val += bytes[i] - 48;
if (val > OVERFLOW_BOUND && (!neg || val > UNDERFLOW_BOUND)) {
setErrorState(ParseErrorState.NUMERIC_VALUE_OVERFLOW_UNDERFLOW);
return -1;
}
}
reusable.setValue((short) (neg ? -val : val));
return limit;
}
@Override
public ShortValue createValue() {
return new ShortValue();
}
@Override
public ShortValue getLastResult() {
return this.result;
}
}