yang/yang-data-api/src/main/java/org/opendaylight/yangtools/yang/data/api/schema/stream/DataSchemaNodeAwareAdaptor.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. 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.api.schema.stream;
   9
  10 import com.google.common.annotations.Beta;
  11 import com.google.common.base.Preconditions;
  12 import javax.annotation.Nonnull;
  13 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  14
  15 /**
  16  * Utility class for adapting {@link NormalizedNodeStreamWriter}s to their {@link DataSchemaNodeAware} counterparts
  17  * which ignore the provided schema node.
  18  */
  19 @Beta
  20 public final class DataSchemaNodeAwareAdaptor {
  21     private DataSchemaNodeAwareAdaptor() {
  22         throw new UnsupportedOperationException();
  23     }
  24
  25     public static SchemaAwareNormalizedNodeStreamAttributeWriter forAttributeWriter(
  26             @Nonnull final NormalizedNodeStreamAttributeWriter writer) {
  27         Preconditions.checkNotNull(writer, "Writer must not be null");
  28
  29         if (writer instanceof SchemaAwareNormalizedNodeStreamAttributeWriter) {
  30             return (SchemaAwareNormalizedNodeStreamAttributeWriter) writer;
  31         }
  32
  33         return new AttributeWriter() {
  34             @Override
  35             protected NormalizedNodeStreamAttributeWriter delegate() {
  36                 return writer;
  37             }
  38         };
  39     }
  40
  41     public static SchemaAwareNormalizedNodeStreamWriter forWriter(@Nonnull final NormalizedNodeStreamWriter writer) {
  42         Preconditions.checkNotNull(writer, "Writer must not be null");
  43
  44         if (writer instanceof SchemaAwareNormalizedNodeStreamWriter) {
  45             return (SchemaAwareNormalizedNodeStreamWriter) writer;
  46         }
  47         if (writer instanceof NormalizedNodeStreamAttributeWriter) {
  48             return forAttributeWriter((NormalizedNodeStreamAttributeWriter) writer);
  49         }
  50
  51         return new Writer() {
  52             @Override
  53             protected NormalizedNodeStreamWriter delegate() {
  54                 return writer;
  55             }
  56         };
  57     }
  58
  59     private static abstract class AttributeWriter extends ForwardingNormalizedNodeStreamAttributeWriter
  60             implements SchemaAwareNormalizedNodeStreamAttributeWriter {
  61         @Override
  62         public void nextDataSchemaNode(final DataSchemaNode schema) {
  63             // Intentional no-op
  64         }
  65     }
  66
  67     private static abstract class Writer extends ForwardingNormalizedNodeStreamWriter
  68             implements SchemaAwareNormalizedNodeStreamWriter {
  69         @Override
  70         public void nextDataSchemaNode(final DataSchemaNode schema) {
  71             // Intentional no-op
  72         }
  73     }
  74 }