+/*
+ * Copyright (c) 2016 Cisco Systems, Inc. and others. 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
+ */
+package org.opendaylight.yangtools.util;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Preconditions;
+import org.opendaylight.yangtools.concepts.Identifier;
+
+/**
+ * An abstract {@link Identifier} backed by an immutable object. Subclasses have no control over {@link #hashCode()}
+ * and {@link #equals(Object)}, hence they should not add any fields.
+ *
+ * @author Robert Varga
+ *
+ * @param <T> Object type
+ */
+public abstract class AbstractIdentifier<T> implements Identifier {
+ private static final long serialVersionUID = 1L;
+
+ private final T value;
+
+ public AbstractIdentifier(final T value) {
+ this.value = Preconditions.checkNotNull(value);
+ }
+
+ public final T getValue() {
+ return value;
+ }
+
+ @Override
+ public final int hashCode() {
+ return value.hashCode();
+ }
+
+ @Override
+ public final boolean equals(final Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null) {
+ return false;
+ }
+
+ return getClass().equals(o.getClass()) && value.equals(((AbstractIdentifier<?>)o).value);
+ }
+
+ @Override
+ public final String toString() {
+ return MoreObjects.toStringHelper(this).add("value", value).toString();
+ }
+}