| /******************************************************************************* |
| * Copyright (c) 2006, 2007 QNX Software Systems and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * QNX - Initial API and implementation |
| * Markus Schorn (Wind River Systems) |
| *******************************************************************************/ |
| package org.eclipse.rephraserengine.internal.db.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. |
| * block. |
| * |
| * @author Doug Schaefer |
| */ |
| public class ListItem { |
| |
| protected final Database db; |
| protected final int 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, int record) { |
| this.db = db; |
| this.record = record; |
| } |
| |
| public ListItem(Database db) throws CoreException { |
| this.db = db; |
| this.record = db.malloc(RECORD_SIZE); |
| } |
| |
| public int getRecord() { |
| return record; |
| } |
| |
| public boolean equals(Object obj) { |
| if (obj == this) |
| return true; |
| else if (obj instanceof ListItem) |
| return record == ((ListItem)obj).record; |
| else |
| return false; |
| } |
| |
| public void setItem(int item) throws CoreException { |
| db.putInt(record + ITEM, item); |
| } |
| |
| public int getItem() throws CoreException { |
| return db.getInt(record + ITEM); |
| } |
| |
| public void setNext(ListItem next) throws CoreException { |
| db.putInt(record + NEXT, next.getRecord()); |
| } |
| |
| public ListItem getNext() throws CoreException { |
| int next = db.getInt(record + NEXT); |
| return next != 0 ? new ListItem(db, next) : null; |
| } |
| |
| public void setPrev(ListItem prev) throws CoreException { |
| db.putInt(record + PREV, prev.getRecord()); |
| } |
| |
| public ListItem getPrev() throws CoreException { |
| int prev = db.getInt(record + PREV); |
| return prev != 0 ? new ListItem(db, prev) : null; |
| } |
| |
| public void delete() throws CoreException { |
| db.free(record); |
| } |
| |
| } |