opendaylight/md-sal/sal-clustering-commons/src/main/java/org/opendaylight/controller/cluster/datastore/node/utils/stream/NormalizedNodeInputStreamReader.java

   1 /*
   2  *
   3  *  Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   4  *
   5  *  This program and the accompanying materials are made available under the
   6  *  terms of the Eclipse Public License v1.0 which accompanies this distribution,
   7  *  and is available at http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  */
  10
  11 package org.opendaylight.controller.cluster.datastore.node.utils.stream;
  12
  13 import com.google.common.base.Preconditions;
  14 import com.google.common.base.Strings;
  15 import java.io.DataInput;
  16 import java.io.DataInputStream;
  17 import java.io.IOException;
  18 import java.io.InputStream;
  19 import java.math.BigDecimal;
  20 import java.math.BigInteger;
  21 import java.nio.charset.StandardCharsets;
  22 import java.util.ArrayList;
  23 import java.util.HashMap;
  24 import java.util.HashSet;
  25 import java.util.List;
  26 import java.util.Map;
  27 import java.util.Set;
  28 import javax.xml.transform.dom.DOMSource;
  29 import org.opendaylight.controller.cluster.datastore.node.utils.QNameFactory;
  30 import org.opendaylight.yangtools.yang.common.QName;
  31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
  35 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  36 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  37 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
  38 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  39 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  40 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.ListNodeBuilder;
  41 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeAttrBuilder;
  42 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeContainerBuilder;
  43 import org.slf4j.Logger;
  44 import org.slf4j.LoggerFactory;
  45
  46 /**
  47  * NormalizedNodeInputStreamReader reads the byte stream and constructs the normalized node including its children nodes.
  48  * This process goes in recursive manner, where each NodeTypes object signifies the start of the object, except END_NODE.
  49  * If a node can have children, then that node's end is calculated based on appearance of END_NODE.
  50  *
  51  */
  52
  53 public class NormalizedNodeInputStreamReader implements NormalizedNodeStreamReader {
  54
  55     private static final Logger LOG = LoggerFactory.getLogger(NormalizedNodeInputStreamReader.class);
  56
  57     private static final String REVISION_ARG = "?revision=";
  58
  59     private final DataInput input;
  60
  61     private final Map<Integer, String> codedStringMap = new HashMap<>();
  62
  63     private QName lastLeafSetQName;
  64
  65     private NormalizedNodeAttrBuilder<YangInstanceIdentifier.NodeIdentifier,
  66                                       Object, LeafNode<Object>> leafBuilder;
  67
  68     private NormalizedNodeAttrBuilder<NodeWithValue, Object,
  69                                       LeafSetEntryNode<Object>> leafSetEntryBuilder;
  70
  71     private final StringBuilder reusableStringBuilder = new StringBuilder(50);
  72
  73     private boolean readSignatureMarker = true;
  74
  75     public NormalizedNodeInputStreamReader(InputStream stream) throws IOException {
  76         Preconditions.checkNotNull(stream);
  77         input = new DataInputStream(stream);
  78     }
  79
  80     public NormalizedNodeInputStreamReader(DataInput input) {
  81         this.input = Preconditions.checkNotNull(input);
  82     }
  83
  84     @Override
  85     public NormalizedNode<?, ?> readNormalizedNode() throws IOException {
  86         readSignatureMarkerAndVersionIfNeeded();
  87         return readNormalizedNodeInternal();
  88     }
  89
  90     private void readSignatureMarkerAndVersionIfNeeded() throws IOException {
  91         if(readSignatureMarker) {
  92             readSignatureMarker = false;
  93
  94             byte marker = input.readByte();
  95             if(marker != NormalizedNodeOutputStreamWriter.SIGNATURE_MARKER) {
  96                 throw new InvalidNormalizedNodeStreamException(String.format(
  97                         "Invalid signature marker: %d", marker));
  98             }
  99
 100             input.readShort(); // read the version - not currently used/needed.
 101         }
 102     }
 103
 104     private NormalizedNode<?, ?> readNormalizedNodeInternal() throws IOException {
 105         // each node should start with a byte
 106         byte nodeType = input.readByte();
 107
 108         if(nodeType == NodeTypes.END_NODE) {
 109             LOG.debug("End node reached. return");
 110             return null;
 111         }
 112
 113         switch(nodeType) {
 114             case NodeTypes.AUGMENTATION_NODE :
 115                 YangInstanceIdentifier.AugmentationIdentifier augIdentifier =
 116                     new YangInstanceIdentifier.AugmentationIdentifier(readQNameSet());
 117
 118                 LOG.debug("Reading augmentation node {} ", augIdentifier);
 119
 120                 return addDataContainerChildren(Builders.augmentationBuilder().
 121                         withNodeIdentifier(augIdentifier)).build();
 122
 123             case NodeTypes.LEAF_SET_ENTRY_NODE :
 124                 Object value = readObject();
 125                 NodeWithValue leafIdentifier = new NodeWithValue(lastLeafSetQName, value);
 126
 127                 LOG.debug("Reading leaf set entry node {}, value {}", leafIdentifier, value);
 128
 129                 return leafSetEntryBuilder().withNodeIdentifier(leafIdentifier).withValue(value).build();
 130
 131             case NodeTypes.MAP_ENTRY_NODE :
 132                 NodeIdentifierWithPredicates entryIdentifier = new NodeIdentifierWithPredicates(
 133                         readQName(), readKeyValueMap());
 134
 135                 LOG.debug("Reading map entry node {} ", entryIdentifier);
 136
 137                 return addDataContainerChildren(Builders.mapEntryBuilder().
 138                         withNodeIdentifier(entryIdentifier)).build();
 139
 140             default :
 141                 return readNodeIdentifierDependentNode(nodeType, new NodeIdentifier(readQName()));
 142         }
 143     }
 144
 145     private NormalizedNodeAttrBuilder<YangInstanceIdentifier.NodeIdentifier,
 146                                       Object, LeafNode<Object>> leafBuilder() {
 147         if(leafBuilder == null) {
 148             leafBuilder = Builders.leafBuilder();
 149         }
 150
 151         return leafBuilder;
 152     }
 153
 154     private NormalizedNodeAttrBuilder<NodeWithValue, Object,
 155                                       LeafSetEntryNode<Object>> leafSetEntryBuilder() {
 156         if(leafSetEntryBuilder == null) {
 157             leafSetEntryBuilder = Builders.leafSetEntryBuilder();
 158         }
 159
 160         return leafSetEntryBuilder;
 161     }
 162
 163     private NormalizedNode<?, ?> readNodeIdentifierDependentNode(byte nodeType, NodeIdentifier identifier)
 164         throws IOException {
 165
 166         switch(nodeType) {
 167             case NodeTypes.LEAF_NODE :
 168                 LOG.debug("Read leaf node {}", identifier);
 169                 // Read the object value
 170                 return leafBuilder().withNodeIdentifier(identifier).withValue(readObject()).build();
 171
 172             case NodeTypes.ANY_XML_NODE :
 173                 LOG.debug("Read xml node");
 174                 return Builders.anyXmlBuilder().withValue((DOMSource) readObject()).build();
 175
 176             case NodeTypes.MAP_NODE :
 177                 LOG.debug("Read map node {}", identifier);
 178                 return addDataContainerChildren(Builders.mapBuilder().
 179                         withNodeIdentifier(identifier)).build();
 180
 181             case NodeTypes.CHOICE_NODE :
 182                 LOG.debug("Read choice node {}", identifier);
 183                 return addDataContainerChildren(Builders.choiceBuilder().
 184                         withNodeIdentifier(identifier)).build();
 185
 186             case NodeTypes.ORDERED_MAP_NODE :
 187                 LOG.debug("Reading ordered map node {}", identifier);
 188                 return addDataContainerChildren(Builders.orderedMapBuilder().
 189                         withNodeIdentifier(identifier)).build();
 190
 191             case NodeTypes.UNKEYED_LIST :
 192                 LOG.debug("Read unkeyed list node {}", identifier);
 193                 return addDataContainerChildren(Builders.unkeyedListBuilder().
 194                         withNodeIdentifier(identifier)).build();
 195
 196             case NodeTypes.UNKEYED_LIST_ITEM :
 197                 LOG.debug("Read unkeyed list item node {}", identifier);
 198                 return addDataContainerChildren(Builders.unkeyedListEntryBuilder().
 199                         withNodeIdentifier(identifier)).build();
 200
 201             case NodeTypes.CONTAINER_NODE :
 202                 LOG.debug("Read container node {}", identifier);
 203                 return addDataContainerChildren(Builders.containerBuilder().
 204                         withNodeIdentifier(identifier)).build();
 205
 206             case NodeTypes.LEAF_SET :
 207                 LOG.debug("Read leaf set node {}", identifier);
 208                 return addLeafSetChildren(identifier.getNodeType(),
 209                         Builders.leafSetBuilder().withNodeIdentifier(identifier)).build();
 210
 211             default :
 212                 return null;
 213         }
 214     }
 215
 216     private QName readQName() throws IOException {
 217         // Read in the same sequence of writing
 218         String localName = readCodedString();
 219         String namespace = readCodedString();
 220         String revision = readCodedString();
 221
 222         String qName;
 223         if(!Strings.isNullOrEmpty(revision)) {
 224             qName = reusableStringBuilder.append('(').append(namespace).append(REVISION_ARG).
 225                         append(revision).append(')').append(localName).toString();
 226         } else {
 227             qName = reusableStringBuilder.append('(').append(namespace).append(')').
 228                         append(localName).toString();
 229         }
 230
 231         reusableStringBuilder.delete(0, reusableStringBuilder.length());
 232         return QNameFactory.create(qName);
 233     }
 234
 235
 236     private String readCodedString() throws IOException {
 237         byte valueType = input.readByte();
 238         if(valueType == NormalizedNodeOutputStreamWriter.IS_CODE_VALUE) {
 239             return codedStringMap.get(input.readInt());
 240         } else if(valueType == NormalizedNodeOutputStreamWriter.IS_STRING_VALUE) {
 241             String value = input.readUTF().intern();
 242             codedStringMap.put(Integer.valueOf(codedStringMap.size()), value);
 243             return value;
 244         }
 245
 246         return null;
 247     }
 248
 249     private Set<QName> readQNameSet() throws IOException{
 250         // Read the children count
 251         int count = input.readInt();
 252         Set<QName> children = new HashSet<>(count);
 253         for(int i = 0; i < count; i++) {
 254             children.add(readQName());
 255         }
 256         return children;
 257     }
 258
 259     private Map<QName, Object> readKeyValueMap() throws IOException {
 260         int count = input.readInt();
 261         Map<QName, Object> keyValueMap = new HashMap<>(count);
 262
 263         for(int i = 0; i < count; i++) {
 264             keyValueMap.put(readQName(), readObject());
 265         }
 266
 267         return keyValueMap;
 268     }
 269
 270     private Object readObject() throws IOException {
 271         byte objectType = input.readByte();
 272         switch(objectType) {
 273             case ValueTypes.BITS_TYPE:
 274                 return readObjSet();
 275
 276             case ValueTypes.BOOL_TYPE :
 277                 return Boolean.valueOf(input.readBoolean());
 278
 279             case ValueTypes.BYTE_TYPE :
 280                 return Byte.valueOf(input.readByte());
 281
 282             case ValueTypes.INT_TYPE :
 283                 return Integer.valueOf(input.readInt());
 284
 285             case ValueTypes.LONG_TYPE :
 286                 return Long.valueOf(input.readLong());
 287
 288             case ValueTypes.QNAME_TYPE :
 289                 return readQName();
 290
 291             case ValueTypes.SHORT_TYPE :
 292                 return Short.valueOf(input.readShort());
 293
 294             case ValueTypes.STRING_TYPE :
 295                 return input.readUTF();
 296
 297             case ValueTypes.STRING_BYTES_TYPE:
 298                 return readStringBytes();
 299
 300             case ValueTypes.BIG_DECIMAL_TYPE :
 301                 return new BigDecimal(input.readUTF());
 302
 303             case ValueTypes.BIG_INTEGER_TYPE :
 304                 return new BigInteger(input.readUTF());
 305
 306             case ValueTypes.BINARY_TYPE :
 307                 byte[] bytes = new byte[input.readInt()];
 308                 input.readFully(bytes);
 309                 return bytes;
 310
 311             case ValueTypes.YANG_IDENTIFIER_TYPE :
 312                 return readYangInstanceIdentifierInternal();
 313
 314             default :
 315                 return null;
 316         }
 317     }
 318
 319     private String readStringBytes() throws IOException {
 320         byte[] bytes = new byte[input.readInt()];
 321         input.readFully(bytes);
 322         return new String(bytes, StandardCharsets.UTF_8);
 323     }
 324
 325     public YangInstanceIdentifier readYangInstanceIdentifier() throws IOException {
 326         readSignatureMarkerAndVersionIfNeeded();
 327         return readYangInstanceIdentifierInternal();
 328     }
 329
 330     private YangInstanceIdentifier readYangInstanceIdentifierInternal() throws IOException {
 331         int size = input.readInt();
 332
 333         List<PathArgument> pathArguments = new ArrayList<>(size);
 334
 335         for(int i = 0; i < size; i++) {
 336             pathArguments.add(readPathArgument());
 337         }
 338         return YangInstanceIdentifier.create(pathArguments);
 339     }
 340
 341     private Set<String> readObjSet() throws IOException {
 342         int count = input.readInt();
 343         Set<String> children = new HashSet<>(count);
 344         for(int i = 0; i < count; i++) {
 345             children.add(readCodedString());
 346         }
 347         return children;
 348     }
 349
 350     public PathArgument readPathArgument() throws IOException {
 351         // read Type
 352         int type = input.readByte();
 353
 354         switch(type) {
 355
 356             case PathArgumentTypes.AUGMENTATION_IDENTIFIER :
 357                 return new YangInstanceIdentifier.AugmentationIdentifier(readQNameSet());
 358
 359             case PathArgumentTypes.NODE_IDENTIFIER :
 360                 return new NodeIdentifier(readQName());
 361
 362             case PathArgumentTypes.NODE_IDENTIFIER_WITH_PREDICATES :
 363                 return new NodeIdentifierWithPredicates(readQName(), readKeyValueMap());
 364
 365             case PathArgumentTypes.NODE_IDENTIFIER_WITH_VALUE :
 366                 return new NodeWithValue(readQName(), readObject());
 367
 368             default :
 369                 return null;
 370         }
 371     }
 372
 373     @SuppressWarnings("unchecked")
 374     private ListNodeBuilder<Object, LeafSetEntryNode<Object>> addLeafSetChildren(QName nodeType,
 375             ListNodeBuilder<Object, LeafSetEntryNode<Object>> builder) throws IOException {
 376
 377         LOG.debug("Reading children of leaf set");
 378
 379         lastLeafSetQName = nodeType;
 380
 381         LeafSetEntryNode<Object> child = (LeafSetEntryNode<Object>)readNormalizedNodeInternal();
 382
 383         while(child != null) {
 384             builder.withChild(child);
 385             child = (LeafSetEntryNode<Object>)readNormalizedNodeInternal();
 386         }
 387         return builder;
 388     }
 389
 390     @SuppressWarnings({ "unchecked", "rawtypes" })
 391     private NormalizedNodeContainerBuilder addDataContainerChildren(
 392             NormalizedNodeContainerBuilder builder) throws IOException {
 393         LOG.debug("Reading data container (leaf nodes) nodes");
 394
 395         NormalizedNode<?, ?> child = readNormalizedNodeInternal();
 396
 397         while(child != null) {
 398             builder.addChild(child);
 399             child = readNormalizedNodeInternal();
 400         }
 401         return builder;
 402     }
 403 }