| /******************************************************************************* |
| * Copyright (c) 2015, 2016 Google, Inc 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: |
| * Stefan Xenos (Google) - Initial implementation |
| *******************************************************************************/ |
| package org.aspectj.org.eclipse.jdt.internal.core.nd; |
| |
| import org.aspectj.org.eclipse.jdt.internal.core.nd.db.Database; |
| |
| /** |
| * Points to a concrete type, NOT one of its subclasses. This should not be used for node |
| * pointers, since they are stored as a pointer to the base class. If you want a pointer to |
| * a node, use a NodeFieldDefinition instead. |
| */ |
| public class Pointer<T> { |
| private final Nd nd; |
| private final long address; |
| private ITypeFactory<T> targetFactory; |
| |
| public Pointer(Nd nd, long address, ITypeFactory<T> targetFactory) { |
| this.nd = nd; |
| this.address = address; |
| this.targetFactory = targetFactory; |
| } |
| |
| public T get() { |
| long ptr = this.nd.getDB().getRecPtr(this.address); |
| |
| if (ptr == 0) { |
| return null; |
| } |
| |
| return this.targetFactory.create(this.nd, ptr); |
| } |
| |
| public static <T> ITypeFactory<Pointer<T>> getFactory(final ITypeFactory<T> targetFactory) { |
| if (NdNode.class.isAssignableFrom(targetFactory.getElementClass())) { |
| throw new IllegalArgumentException("Don't use Pointer<T> for references to NdNode"); //$NON-NLS-1$ |
| } |
| return new AbstractTypeFactory<Pointer<T>>() { |
| @Override |
| public Pointer<T> create(Nd dom, long address) { |
| return new Pointer<T>(dom, address, targetFactory); |
| } |
| |
| @Override |
| public int getRecordSize() { |
| return Database.PTR_SIZE; |
| } |
| |
| @Override |
| public Class<?> getElementClass() { |
| return Pointer.class; |
| } |
| }; |
| } |
| } |