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/*******************************************************************************
* Copyright (c) 2006, 2012 QNX Software Systems and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* QNX - Initial API and implementation
* Markus Schorn (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.core.pdom.db;
import org.eclipse.core.runtime.CoreException;
/**
* This is a list item. It contains a next and prev pointer
* as well as a pointer to the item.
*
* @author Doug Schaefer
*/
public class ListItem {
protected final Database db;
protected final long record;
protected static final int NEXT = 0;
protected static final int PREV = 4;
protected static final int ITEM = 8;
protected static final int RECORD_SIZE = 12;
public ListItem(Database db, long record) {
this.db = db;
this.record = record;
}
public ListItem(Database db) throws CoreException {
this.db = db;
this.record = db.malloc(RECORD_SIZE);
}
public long getRecord() {
return record;
}
@Override
public boolean equals(Object obj) {
if (obj == this)
return true;
if (obj instanceof ListItem)
return record == ((ListItem) obj).record;
return false;
}
public void setItem(long item) throws CoreException {
db.putRecPtr(record + ITEM, item);
}
public long getItem() throws CoreException {
return db.getRecPtr(record + ITEM);
}
public void setNext(ListItem next) throws CoreException {
db.putRecPtr(record + NEXT, next.getRecord());
}
public ListItem getNext() throws CoreException {
long next = db.getRecPtr(record + NEXT);
return next != 0 ? new ListItem(db, next) : null;
}
public void setPrev(ListItem prev) throws CoreException {
db.putRecPtr(record + PREV, prev.getRecord());
}
public ListItem getPrev() throws CoreException {
long prev = db.getRecPtr(record + PREV);
return prev != 0 ? new ListItem(db, prev) : null;
}
public void delete() throws CoreException {
db.free(record);
}
}
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