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
/*******************************************************************************
 * 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.eclipse.jdt.internal.core.nd.field;

import org.eclipse.jdt.internal.core.nd.Nd;
import org.eclipse.jdt.internal.core.nd.db.ModificationLog;
import org.eclipse.jdt.internal.core.nd.db.ModificationLog.Tag;
import org.eclipse.jdt.internal.core.nd.db.Database;

public class FieldPointer extends BaseField {
	private final Tag putTag;

	public FieldPointer(String structName, int fieldNumber) {
		setFieldName("field " + fieldNumber + ", a " + getClass().getSimpleName() //$NON-NLS-1$//$NON-NLS-2$
				+ " in struct " + structName); //$NON-NLS-1$
		this.putTag = ModificationLog.createTag("Writing " + getFieldName()); //$NON-NLS-1$
	}

	public long get(Nd nd, long address) {
		Database db = nd.getDB();
		return db.getRecPtr(address + this.offset);
	}

	public void put(Nd nd, long address, long newValue) {
		Database db = nd.getDB();
		db.getLog().start(this.putTag);
		try {
			nd.getDB().putRecPtr(address + this.offset, newValue);
		} finally {
			db.getLog().end(this.putTag);
		}
	}

	@Override
	public int getRecordSize() {
		return Database.PTR_SIZE;
	}
}