2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.yangtools.yang.model.repo.util;
10 import static com.google.common.base.Preconditions.checkState;
11 import static java.util.Objects.requireNonNull;
13 import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceRegistration;
15 final class RefcountedRegistration {
16 private final SchemaSourceRegistration<?> reg;
17 private int refcount = 1;
19 RefcountedRegistration(final SchemaSourceRegistration<?> reg) {
20 this.reg = requireNonNull(reg);
23 public void incRef() {
27 public boolean decRef() {
28 checkState(refcount > 0, "Refcount underflow: %s", refcount);
30 if (0 == --refcount) {