/* Copyright (c) 2001-2018, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.persist;
import org.hsqldb.error.
Error;
import org.hsqldb.error.
ErrorCode;
/**
* Base class for a stored object.
*
* @author Fred Toussi (fredt@users dot sourceforge dot net)
* @version 2.3.3
*/
public abstract class
CachedObjectBase implements
CachedObject {
boolean
isMemory;
long
position;
int
storageSize;
boolean
isInMemory;
boolean
hasChanged;
int
keepCount;
int
accessCount;
public boolean
isMemory() {
return
isMemory;
}
public void
updateAccessCount(int
count) {
accessCount =
count;
}
public int
getAccessCount() {
return
accessCount;
}
public void
setStorageSize(int
size) {
storageSize =
size;
}
public int
getStorageSize() {
return
storageSize;
}
public final boolean
isInvariable() {
return false;
}
public final boolean
isBlock() {
return true;
}
public long
getPos() {
return
position;
}
public void
setPos(long
pos) {
position =
pos;
}
public boolean
isNew() {
return false;
}
public boolean
hasChanged() {
return
hasChanged;
}
public final void
setChanged(boolean
flag) {
hasChanged =
flag;
}
public boolean
isKeepInMemory() {
return
keepCount > 0;
}
public boolean
keepInMemory(boolean
keep) {
if (!
isInMemory) {
return false;
}
if (
keep) {
keepCount++;
} else {
if (
keepCount == 0) {
throw
Error.
runtimeError(
ErrorCode.
U_S0500,
"CachedObjectBase - keep count");
}
keepCount--;
}
return true;
}
public boolean
isInMemory() {
return
isInMemory;
}
public void
setInMemory(boolean
in) {
isInMemory =
in;
}
public boolean
equals(
Object other) {
return
other instanceof
CachedObjectBase
&& ((
CachedObjectBase)
other).
position == this.
position;
}
public int
hashCode() {
return (int)
position;
}
public void
restore() {}
public void
destroy() {}
}