org.gridkit.jvmtool.heapdump.RefSet Maven / Gradle / Ivy
/**
* Copyright 2014 Alexey Ragozin
*
* 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 org.gridkit.jvmtool.heapdump;
import org.gridkit.jvmtool.util.PagedBitMap;
/**
* This is thin wrapper around {@link PagedBitMap}
* enforcing 8 byte index alignment (and compressing indexes in underlying bitmap).
*
* @author Alexey Ragozin ([email protected])
*/
public class RefSet extends PagedBitMap {
public RefSet() {
super(true);
}
public RefSet(boolean sparse) {
super(sparse);
}
@Override
public boolean get(long index) {
if (index % 8 != 0) {
throw new IllegalArgumentException("" + index);
}
return super.get(index >>> 3);
}
@Override
public long seekOne(long index) {
index = (index + 7) >>> 3; // aligning to 8 byte boundary
long result = super.seekOne(index);
if (result == -1) {
return -1;
}
else {
return 8 * result;
}
}
@Override
public boolean getAndSet(long index, boolean value) {
if (index % 8 != 0) {
throw new IllegalArgumentException("" + index);
}
return super.getAndSet(index >>> 3, value);
}
@Override
public void set(long index, boolean value) {
if (index % 8 != 0) {
throw new IllegalArgumentException("" + index);
}
super.set(index >>> 3, value);
}
@Override
public void sub(PagedBitMap that) {
super.sub(that);
}
}