--- /dev/null
+/*
+ * Copyright (c) 2014 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.controller.remote.rpc.utils;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Preconditions;
+import org.opendaylight.yangtools.yang.common.QName;
+import org.opendaylight.yangtools.yang.data.api.AttributesContainer;
+import org.opendaylight.yangtools.yang.data.api.CompositeNode;
+import org.opendaylight.yangtools.yang.data.api.Node;
+import org.opendaylight.yangtools.yang.data.api.SimpleNode;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
+import org.opendaylight.yangtools.yang.data.impl.codec.xml.XmlCodecProvider;
+import org.opendaylight.yangtools.yang.data.impl.schema.SchemaUtils;
+import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
+import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.SchemaNode;
+import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamWriter;
+import java.net.URI;
+import java.util.Map.Entry;
+
+/**
+ * Utility class for bridging JAXP Stream and YANG Data APIs. Note that the definition of this class
+ * by no means final and subject to change as more functionality is centralized here.
+ */
+@Beta
+public class XmlStreamUtils {
+ private static final Logger LOG = LoggerFactory.getLogger(XmlStreamUtils.class);
+ private final XmlCodecProvider codecProvider;
+
+ protected XmlStreamUtils(final XmlCodecProvider codecProvider) {
+ this.codecProvider = Preconditions.checkNotNull(codecProvider);
+ }
+
+ /**
+ * Create a new instance encapsulating a particular codec provider.
+ *
+ * @param codecProvider XML codec provider
+ * @return A new instance
+ */
+ public static XmlStreamUtils create(final XmlCodecProvider codecProvider) {
+ return new XmlStreamUtils(codecProvider);
+ }
+
+ /**
+ * Check if a particular data element can be emitted as an empty element, bypassing value encoding. This
+ * functionality is optional, as valid XML stream is produced even if start/end element is produced unconditionally.
+ *
+ * @param data Data node
+ * @return True if the data node will result in empty element body.
+ */
+ public static boolean isEmptyElement(final Node<?> data) {
+ if (data == null) {
+ return true;
+ }
+
+ if (data instanceof CompositeNode) {
+ return ((CompositeNode) data).getValue().isEmpty();
+ }
+ if (data instanceof SimpleNode) {
+ return data.getValue() == null;
+ }
+
+ // Safe default
+ return false;
+ }
+
+ /**
+ * Write an InstanceIdentifier into the output stream. Calling corresponding {@link javax.xml.stream.XMLStreamWriter#writeStartElement(String)}
+ * and {@link javax.xml.stream.XMLStreamWriter#writeEndElement()} is the responsibility of the caller.
+ *
+ * @param writer XML Stream writer
+ * @param id InstanceIdentifier
+ * @throws javax.xml.stream.XMLStreamException
+ */
+ public static void write(final @Nonnull XMLStreamWriter writer, final @Nonnull YangInstanceIdentifier id) throws XMLStreamException {
+ Preconditions.checkNotNull(writer, "Writer may not be null");
+ Preconditions.checkNotNull(id, "Variable should contain instance of instance identifier and can't be null");
+
+ final RandomPrefix prefixes = new RandomPrefix();
+ final String str = XmlUtils.encodeIdentifier(prefixes, id);
+
+ for (Entry<URI, String> e: prefixes.getPrefixes()) {
+ writer.writeNamespace(e.getValue(), e.getKey().toString());
+ }
+ writer.writeCharacters(str);
+ }
+
+ /**
+ * Write a full XML document corresponding to a CompositeNode into an XML stream writer.
+ *
+ * @param writer XML Stream writer
+ * @param data data node
+ * @param schema corresponding schema node, may be null
+ * @throws javax.xml.stream.XMLStreamException if an encoding problem occurs
+ */
+ public void writeDocument(final @Nonnull XMLStreamWriter writer, final @Nonnull CompositeNode data, final @Nullable SchemaNode schema) throws XMLStreamException {
+ // final Boolean repairing = (Boolean) writer.getProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES);
+ // Preconditions.checkArgument(repairing == true, "XML Stream Writer has to be repairing namespaces");
+
+ writer.writeStartDocument();
+ writeElement(writer, data, schema);
+ writer.writeEndDocument();
+ writer.flush();
+ }
+
+
+ /**
+ * Write an element into a XML stream writer. This includes the element start/end tags and
+ * the value of the element.
+ *
+ * @param writer XML Stream writer
+ * @param data data node
+ * @param schema Schema node
+ * @throws javax.xml.stream.XMLStreamException if an encoding problem occurs
+ */
+ public void writeElement(final XMLStreamWriter writer, final @Nonnull Node<?> data, final SchemaNode schema) throws XMLStreamException {
+ final QName qname = data.getNodeType();
+ final String pfx = qname.getPrefix() != null ? qname.getPrefix() : "";
+ final String ns = qname.getNamespace() != null ? qname.getNamespace().toString() : "";
+
+ if (isEmptyElement(data)) {
+ writer.writeEmptyElement(pfx, qname.getLocalName(), ns);
+ return;
+ }
+
+ writer.writeStartElement(pfx, qname.getLocalName(), ns);
+ if (data instanceof AttributesContainer && ((AttributesContainer) data).getAttributes() != null) {
+ for (Entry<QName, String> attribute : ((AttributesContainer) data).getAttributes().entrySet()) {
+ writer.writeAttribute(attribute.getKey().getNamespace().toString(), attribute.getKey().getLocalName(), attribute.getValue());
+ }
+ }
+
+ if (data instanceof SimpleNode<?>) {
+ // Simple node
+ if (schema instanceof LeafListSchemaNode) {
+ writeValue(writer, ((LeafListSchemaNode) schema).getType(), data.getValue());
+ } else if (schema instanceof LeafSchemaNode) {
+ writeValue(writer, ((LeafSchemaNode) schema).getType(), data.getValue());
+ } else {
+ Object value = data.getValue();
+ if (value != null) {
+ writer.writeCharacters(String.valueOf(value));
+ }
+ }
+ } else {
+ // CompositeNode
+ for (Node<?> child : ((CompositeNode) data).getValue()) {
+ DataSchemaNode childSchema = null;
+ if (schema instanceof DataNodeContainer) {
+ childSchema = SchemaUtils.findFirstSchema(child.getNodeType(), ((DataNodeContainer) schema).getChildNodes()).orNull();
+ if (LOG.isDebugEnabled()) {
+ if (childSchema == null) {
+ LOG.debug("Probably the data node \"{}\" does not conform to schema", child == null ? "" : child.getNodeType().getLocalName());
+ }
+ }
+ }
+
+ writeElement(writer, child, childSchema);
+ }
+ }
+
+ writer.writeEndElement();
+ }
+
+ /**
+ * Write a value into a XML stream writer. This method assumes the start and end of element is
+ * emitted by the caller.
+ *
+ * @param writer XML Stream writer
+ * @param type type definitions
+ * @param value object value
+ * @throws javax.xml.stream.XMLStreamException if an encoding problem occurs
+ */
+ public void writeValue(final @Nonnull XMLStreamWriter writer, final @Nonnull TypeDefinition<?> type, final Object value) throws XMLStreamException {
+ if (value == null) {
+ LOG.debug("Value of {}:{} is null, not encoding it", type.getQName().getNamespace(), type.getQName().getLocalName());
+ return;
+ }
+
+ final TypeDefinition<?> baseType = XmlUtils.resolveBaseTypeFrom(type);
+ if (baseType instanceof IdentityrefTypeDefinition) {
+ write(writer, (IdentityrefTypeDefinition) baseType, value);
+ } else if (baseType instanceof InstanceIdentifierTypeDefinition) {
+ write(writer, (InstanceIdentifierTypeDefinition) baseType, value);
+ } else {
+ final TypeDefinitionAwareCodec<Object, ?> codec = codecProvider.codecFor(baseType);
+ String text;
+ if (codec != null) {
+ try {
+ text = codec.serialize(value);
+ } catch (ClassCastException e) {
+ LOG.error("Provided node value {} did not have type {} required by mapping. Using stream instead.", value, baseType, e);
+ text = String.valueOf(value);
+ }
+ } else {
+ LOG.error("Failed to find codec for {}, falling back to using stream", baseType);
+ text = String.valueOf(value);
+ }
+ writer.writeCharacters(text);
+ }
+ }
+
+ private static void write(final @Nonnull XMLStreamWriter writer, final @Nonnull IdentityrefTypeDefinition type, final @Nonnull Object value) throws XMLStreamException {
+ if (value instanceof QName) {
+ final QName qname = (QName) value;
+ final String prefix;
+ if (qname.getPrefix() != null && !qname.getPrefix().isEmpty()) {
+ prefix = qname.getPrefix();
+ } else {
+ prefix = "x";
+ }
+
+ writer.writeNamespace(prefix, qname.getNamespace().toString());
+ writer.writeCharacters(prefix + ':' + qname.getLocalName());
+ } else {
+ LOG.debug("Value of {}:{} is not a QName but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
+ writer.writeCharacters(String.valueOf(value));
+ }
+ }
+
+ private static void write(final @Nonnull XMLStreamWriter writer, final @Nonnull InstanceIdentifierTypeDefinition type, final @Nonnull Object value) throws XMLStreamException {
+ if (value instanceof YangInstanceIdentifier) {
+ write(writer, (YangInstanceIdentifier)value);
+ } else {
+ LOG.debug("Value of {}:{} is not an InstanceIdentifier but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
+ writer.writeCharacters(String.valueOf(value));
+ }
+ }
+}
Code Review / controller.git / blobdiff