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- /*
- Copyright (c) 2008 Health Market Science, Inc.
-
- 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 com.healthmarketscience.jackcess.impl;
-
-
- /**
- * Various constants used for creating index entries.
- *
- * @author James Ahlborn
- */
- public class IndexCodes {
-
- static final byte ASC_START_FLAG = (byte)0x7F;
- static final byte ASC_NULL_FLAG = (byte)0x00;
- static final byte DESC_START_FLAG = (byte)0x80;
- static final byte DESC_NULL_FLAG = (byte)0xFF;
-
- static final byte ASC_BOOLEAN_TRUE = (byte)0x00;
- static final byte ASC_BOOLEAN_FALSE = (byte)0xFF;
-
- static final byte DESC_BOOLEAN_TRUE = ASC_BOOLEAN_FALSE;
- static final byte DESC_BOOLEAN_FALSE = ASC_BOOLEAN_TRUE;
-
-
- static boolean isNullEntry(byte startEntryFlag) {
- return((startEntryFlag == ASC_NULL_FLAG) ||
- (startEntryFlag == DESC_NULL_FLAG));
- }
-
- static byte getNullEntryFlag(boolean isAscending) {
- return(isAscending ? ASC_NULL_FLAG : DESC_NULL_FLAG);
- }
-
- static byte getStartEntryFlag(boolean isAscending) {
- return(isAscending ? ASC_START_FLAG : DESC_START_FLAG);
- }
-
- }
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