content: /*******************************************************************************
   * Copyright (c) 2009, 2019 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:
   *    Evgeny Mandrikov - initial API and implementation
   *
   *******************************************************************************/
  package org.jacoco.core.internal.analysis.filter;
  
  import org.objectweb.asm.Opcodes;
  import org.objectweb.asm.tree.MethodNode;
  
  /**
   * Filters private empty constructors that do not have arguments.
   */
  public final class PrivateEmptyNoArgConstructorFilter implements IFilter {
  
  	private static final String CONSTRUCTOR_NAME = "<init>";
  	private static final String CONSTRUCTOR_DESC = "()V";
  
  	public void filter(final MethodNode methodNode,
  			final IFilterContext context, final IFilterOutput output) {
  		if ((methodNode.access & Opcodes.ACC_PRIVATE) != 0
  				&& CONSTRUCTOR_NAME.equals(methodNode.name)
  				&& CONSTRUCTOR_DESC.equals(methodNode.desc) && new Matcher()
  						.match(methodNode, context.getSuperClassName())) {
  			output.ignore(methodNode.instructions.getFirst(),
  					methodNode.instructions.getLast());
  		}
  	}
  
  	private static class Matcher extends AbstractMatcher {
  		private boolean match(final MethodNode methodNode,
  				final String superClassName) {
  			firstIsALoad0(methodNode);
  			nextIsInvoke(Opcodes.INVOKESPECIAL, superClassName,
  					CONSTRUCTOR_NAME, CONSTRUCTOR_DESC);
  			nextIs(Opcodes.RETURN);
  			return cursor != null;
  		}
  	}
  
  }
  