data/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/schema/InterningLeafNodeBuilder.java

   1 /*
   2  * Copyright (c) 2019 PANTHEON.tech, s.r.o. and others.  All rights reserved.
   3  *
   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
   7  */
   8 package org.opendaylight.yangtools.yang.data.impl.schema;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.collect.Interner;
  13 import java.util.Optional;
  14 import org.eclipse.jdt.annotation.Nullable;
  15 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  16 import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableLeafNodeBuilder;
  17 import org.opendaylight.yangtools.yang.data.util.LeafInterner;
  18 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  19 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  20
  21 final class InterningLeafNodeBuilder<T> extends ImmutableLeafNodeBuilder<T> {
  22     private final Interner<LeafNode<T>> interner;
  23
  24     private InterningLeafNodeBuilder(final Interner<LeafNode<T>> interner) {
  25         this.interner = requireNonNull(interner);
  26     }
  27
  28     static <T> @Nullable InterningLeafNodeBuilder<T> forSchema(final @Nullable DataSchemaNode schema) {
  29         if (schema instanceof LeafSchemaNode) {
  30             final Optional<Interner<LeafNode<T>>> interner = LeafInterner.forSchema((LeafSchemaNode)schema);
  31             if (interner.isPresent()) {
  32                 return new InterningLeafNodeBuilder<>(interner.get());
  33             }
  34         }
  35         return null;
  36     }
  37
  38     @Override
  39     public LeafNode<T> build() {
  40         return interner.intern(super.build());
  41     }
  42 }