io.datarouter.binarydto.internal.BinaryDtoNullFieldTool Maven / Gradle / Ivy
/*
* Copyright © 2009 HotPads ([email protected])
*
* 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 io.datarouter.binarydto.internal;
import java.util.Arrays;
public class BinaryDtoNullFieldTool{
// Define null behavior. Nulls will sort before non-nulls for unsigned byte comparisons.
public static final int NULL_INDICATOR_LENGTH = 1;
public static final byte NULL_INDICATOR_TRUE = 0;//all zero bits
public static final byte[] NULL_INDICATOR_TRUE_ARRAY = {NULL_INDICATOR_TRUE};
public static final byte NULL_INDICATOR_FALSE = 1;//rightmost one bit
public static final byte[] NULL_INDICATOR_FALSE_ARRAY = {NULL_INDICATOR_FALSE};
static{
if(Arrays.compareUnsigned(NULL_INDICATOR_TRUE_ARRAY, NULL_INDICATOR_FALSE_ARRAY) >= 0){
throw new IllegalArgumentException("Nulls should sort before non-nulls.");
}
}
public static boolean decodeNullIndicator(byte value){
if(value == NULL_INDICATOR_FALSE){
return false;
}else if(value == NULL_INDICATOR_TRUE){
return true;
}else{
throw new IllegalArgumentException("unknown nullIndicator=" + value);
}
}
}