/***********************************************************************************************************************
* 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;
/**
* An exception specifying that a required key field was not set in a record, i.e. was <code>null</code>.
*/
public class NullKeyFieldException extends RuntimeException
{
/**
* UID for serialization interoperability.
*/
private static final long serialVersionUID = -3254501285363420762L;
private final int fieldNumber;
/**
* Constructs an {@code NullKeyFieldException} with {@code null}
* as its error detail message.
*/
public NullKeyFieldException() {
super();
this.fieldNumber = -1;
}
/**
* Constructs an {@code NullKeyFieldException} with the specified detail message.
*
* @param message The detail message.
*/
public NullKeyFieldException(String message) {
super(message);
this.fieldNumber = -1;
}
/**
* Constructs an {@code NullKeyFieldException} with a default message, referring to
* given field number as the null key field.
*
* @param fieldNumber The index of the field that was null, bit expected to hold a key.
*/
public NullKeyFieldException(int fieldNumber) {
super("Field " + fieldNumber + " is null, but expected to hold a key.");
this.fieldNumber = fieldNumber;
}
/**
* Gets the field number that was attempted to access. If the number is not set, this method returns
* {@code -1}.
*
* @return The field number that was attempted to access, or {@code -1}, if not set.
*/
public int getFieldNumber() {
return this.fieldNumber;
}
}