opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/impl/JsonMapper.java

   1 package org.opendaylight.controller.sal.rest.impl;
   2
   3 import static com.google.common.base.Preconditions.checkNotNull;
   4
   5 import java.io.IOException;
   6 import java.util.HashSet;
   7 import java.util.List;
   8 import java.util.Set;
   9
  10 import javax.activation.UnsupportedDataTypeException;
  11
  12 import org.opendaylight.yangtools.yang.data.api.CompositeNode;
  13 import org.opendaylight.yangtools.yang.data.api.Node;
  14 import org.opendaylight.yangtools.yang.data.api.SimpleNode;
  15 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  16 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  17 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  18 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
  19 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  20 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  21 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
  22 import org.opendaylight.yangtools.yang.model.api.type.BooleanTypeDefinition;
  23 import org.opendaylight.yangtools.yang.model.api.type.DecimalTypeDefinition;
  24 import org.opendaylight.yangtools.yang.model.api.type.EmptyTypeDefinition;
  25 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
  26 import org.opendaylight.yangtools.yang.model.api.type.IntegerTypeDefinition;
  27 import org.opendaylight.yangtools.yang.model.api.type.UnsignedIntegerTypeDefinition;
  28
  29 import com.google.common.base.Preconditions;
  30 import com.google.gson.stream.JsonWriter;
  31
  32 class JsonMapper {
  33
  34     private final Set<LeafListSchemaNode> foundLeafLists = new HashSet<>();
  35     private final Set<ListSchemaNode> foundLists = new HashSet<>();
  36
  37     public void write(JsonWriter writer, CompositeNode data, DataNodeContainer schema) throws IOException {
  38         Preconditions.checkNotNull(writer);
  39         Preconditions.checkNotNull(data);
  40         Preconditions.checkNotNull(schema);
  41
  42         writer.beginObject();
  43
  44         if (schema instanceof ContainerSchemaNode) {
  45             writeContainer(writer, data, (ContainerSchemaNode) schema);
  46         } else if (schema instanceof ListSchemaNode) {
  47             writeList(writer, data, (ListSchemaNode) schema);
  48         } else {
  49             throw new UnsupportedDataTypeException(
  50                     "Schema can be ContainerSchemaNode or ListSchemaNode. Other types are not supported yet.");
  51         }
  52
  53         writer.endObject();
  54
  55         foundLeafLists.clear();
  56         foundLists.clear();
  57     }
  58
  59     private void writeChildrenOfParent(JsonWriter writer, CompositeNode parent, DataNodeContainer parentSchema) throws IOException {
  60         checkNotNull(parent);
  61         checkNotNull(parentSchema);
  62
  63         for (Node<?> child : parent.getChildren()) {
  64             DataSchemaNode childSchema = findFirstSchemaForNode(child, parentSchema.getChildNodes());
  65             if (childSchema == null) {
  66                 throw new UnsupportedDataTypeException("Probably the data node \"" + child.getNodeType().getLocalName()
  67                         + "\" is not conform to schema");
  68             }
  69
  70             if (childSchema instanceof ContainerSchemaNode) {
  71                 Preconditions.checkState(child instanceof CompositeNode,
  72                         "Data representation of Container should be CompositeNode - " + child.getNodeType());
  73                 writeContainer(writer, (CompositeNode) child, (ContainerSchemaNode) childSchema);
  74             } else if (childSchema instanceof ListSchemaNode) {
  75                 if (!foundLists.contains(childSchema)) {
  76                     Preconditions.checkState(child instanceof CompositeNode,
  77                             "Data representation of List should be CompositeNode - " + child.getNodeType());
  78                     foundLists.add((ListSchemaNode) childSchema);
  79                     writeList(writer, (CompositeNode) child, (ListSchemaNode) childSchema);
  80                 }
  81             } else if (childSchema instanceof LeafListSchemaNode) {
  82                 if (!foundLeafLists.contains(childSchema)) {
  83                     Preconditions.checkState(child instanceof SimpleNode<?>,
  84                             "Data representation of LeafList should be SimpleNode - " + child.getNodeType());
  85                     foundLeafLists.add((LeafListSchemaNode) childSchema);
  86                     writeLeafList(writer, (SimpleNode<?>) child, (LeafListSchemaNode) childSchema);
  87                 }
  88             } else if (childSchema instanceof LeafSchemaNode) {
  89                 Preconditions.checkState(child instanceof SimpleNode<?>,
  90                         "Data representation of LeafList should be SimpleNode - " + child.getNodeType());
  91                 writeLeaf(writer, (SimpleNode<?>) child, (LeafSchemaNode) childSchema);
  92             } else {
  93                 throw new UnsupportedDataTypeException("Schema can be ContainerSchemaNode, ListSchemaNode, "
  94                         + "LeafListSchemaNode, or LeafSchemaNode. Other types are not supported yet.");
  95             }
  96         }
  97
  98         for (Node<?> child : parent.getChildren()) {
  99             DataSchemaNode childSchema = findFirstSchemaForNode(child, parentSchema.getChildNodes());
 100             if (childSchema instanceof LeafListSchemaNode) {
 101                 foundLeafLists.remove((LeafListSchemaNode) childSchema);
 102             } else if (childSchema instanceof ListSchemaNode) {
 103                 foundLists.remove((ListSchemaNode) childSchema);
 104             }
 105         }
 106     }
 107
 108     private DataSchemaNode findFirstSchemaForNode(Node<?> node, Set<DataSchemaNode> dataSchemaNode) {
 109         for (DataSchemaNode dsn : dataSchemaNode) {
 110             if (node.getNodeType().getLocalName().equals(dsn.getQName().getLocalName())) {
 111                 return dsn;
 112             }
 113         }
 114         return null;
 115     }
 116
 117     private void writeContainer(JsonWriter writer, CompositeNode node, ContainerSchemaNode schema) throws IOException {
 118         writer.name(node.getNodeType().getLocalName());
 119         writer.beginObject();
 120         writeChildrenOfParent(writer, node, schema);
 121         writer.endObject();
 122     }
 123
 124     private void writeList(JsonWriter writer, CompositeNode node, ListSchemaNode schema) throws IOException {
 125             writer.name(node.getNodeType().getLocalName());
 126             writer.beginArray();
 127
 128             if (node.getParent() != null) {
 129                 CompositeNode parent = node.getParent();
 130                 List<CompositeNode> nodeLists = parent.getCompositesByName(node.getNodeType());
 131                 for (CompositeNode nodeList : nodeLists) {
 132                     writer.beginObject();
 133                     writeChildrenOfParent(writer, nodeList, schema);
 134                     writer.endObject();
 135                 }
 136             } else {
 137                 writer.beginObject();
 138                 writeChildrenOfParent(writer, node, schema);
 139                 writer.endObject();
 140             }
 141
 142             writer.endArray();
 143     }
 144
 145     private void writeLeafList(JsonWriter writer, SimpleNode<?> node, LeafListSchemaNode schema) throws IOException {
 146             writer.name(node.getNodeType().getLocalName());
 147             writer.beginArray();
 148
 149             CompositeNode parent = node.getParent();
 150             List<SimpleNode<?>> nodeLeafLists = parent.getSimpleNodesByName(node.getNodeType());
 151             for (SimpleNode<?> nodeLeafList : nodeLeafLists) {
 152                 writeValueOfNodeByType(writer, nodeLeafList, schema.getType());
 153             }
 154
 155             writer.endArray();
 156     }
 157
 158     private void writeLeaf(JsonWriter writer, SimpleNode<?> node, LeafSchemaNode schema) throws IOException {
 159         writer.name(node.getNodeType().getLocalName());
 160         writeValueOfNodeByType(writer, node, schema.getType());
 161     }
 162
 163     private void writeValueOfNodeByType(JsonWriter writer, SimpleNode<?> node, TypeDefinition<?> type) throws IOException {
 164         if (!(node.getValue() instanceof String)) {
 165             throw new IllegalStateException("Value in SimpleNode should be type String");
 166         }
 167
 168         String value = (String) node.getValue();
 169         // TODO check Leafref, InstanceIdentifierTypeDefinition, IdentityrefTypeDefinition, UnionTypeDefinition
 170         if (type.getBaseType() != null) {
 171             writeValueOfNodeByType(writer, node, type.getBaseType());
 172         } else if (type instanceof InstanceIdentifierTypeDefinition) {
 173             writer.value(((InstanceIdentifierTypeDefinition) type).getPathStatement().toString());
 174         } else if (type instanceof DecimalTypeDefinition
 175                 || type instanceof IntegerTypeDefinition
 176                 || type instanceof UnsignedIntegerTypeDefinition) {
 177             writer.value(new NumberForJsonWriter(value));
 178         } else if (type instanceof BooleanTypeDefinition) {
 179             writer.value(Boolean.parseBoolean(value));
 180         } else if (type instanceof EmptyTypeDefinition) {
 181             writer.beginArray();
 182             writer.nullValue();
 183             writer.endArray();
 184         } else {
 185             writer.value(value != null ? value : "");
 186         }
 187     }
 188
 189     private static final class NumberForJsonWriter extends Number {
 190
 191         private static final long serialVersionUID = -3147729419814417666L;
 192         private final String value;
 193
 194         public NumberForJsonWriter(String value) {
 195             this.value = value;
 196         }
 197
 198         @Override
 199         public int intValue() {
 200             throw new IllegalStateException("Should not be invoked");
 201         }
 202
 203         @Override
 204         public long longValue() {
 205             throw new IllegalStateException("Should not be invoked");
 206         }
 207
 208         @Override
 209         public float floatValue() {
 210             throw new IllegalStateException("Should not be invoked");
 211         }
 212
 213         @Override
 214         public double doubleValue() {
 215             throw new IllegalStateException("Should not be invoked");
 216         }
 217
 218         @Override
 219         public String toString() {
 220             return value;
 221         }
 222
 223     }
 224
 225 }