LazyFrameTracker.java
/*******************************************************************************
* Copyright (c) 2009, 2012 Mountainminds GmbH & Co. KG and Contributors
* 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:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.instr;
import org.objectweb.asm.MethodAdapter;
import org.objectweb.asm.MethodVisitor;
/**
* Internal wrapper for the FrameTracker which activates frame tracking lazily
* when the first frame is reported.
*/
class LazyFrameTracker extends MethodAdapter implements IFrameInserter {
private final String owner;
private FrameTracker tracker;
public LazyFrameTracker(final MethodVisitor mv, final String owner) {
super(mv);
this.owner = owner;
this.tracker = null;
}
@Override
public void visitFrame(final int type, final int nLocal,
final Object[] local, final int nStack, final Object[] stack) {
if (tracker == null) {
mv = tracker = new FrameTracker(mv, owner);
}
tracker.visitFrame(type, nLocal, local, nStack, stack);
}
public void insertFrame() {
if (tracker != null) {
tracker.insertFrame();
}
}
}