Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.apache.olingo.commons.core.serialization; import com.fasterxml.aalto.stax.InputFactoryImpl; import org.apache.commons.lang3.StringUtils; import org.apache.olingo.commons.api.Constants; import org.apache.olingo.commons.api.data.Annotation; import org.apache.olingo.commons.api.data.DeletedEntity.Reason; import org.apache.olingo.commons.api.data.Delta; import org.apache.olingo.commons.api.data.Entity; import org.apache.olingo.commons.api.data.EntitySet; import org.apache.olingo.commons.api.data.LinkedComplexValue; import org.apache.olingo.commons.api.data.Property; import org.apache.olingo.commons.api.data.ResWrap; import org.apache.olingo.commons.api.data.Valuable; import org.apache.olingo.commons.api.data.ValueType; import org.apache.olingo.commons.api.data.v3.LinkCollection; import org.apache.olingo.commons.api.domain.ODataError; import org.apache.olingo.commons.api.domain.ODataOperation; import org.apache.olingo.commons.api.domain.ODataPropertyType; import org.apache.olingo.commons.api.edm.EdmPrimitiveType; import org.apache.olingo.commons.api.edm.EdmPrimitiveTypeException; import org.apache.olingo.commons.api.edm.EdmPrimitiveTypeKind; import org.apache.olingo.commons.api.edm.constants.ODataServiceVersion; import org.apache.olingo.commons.api.edm.constants.ODataServiceVersion.NamespaceKey; import org.apache.olingo.commons.api.edm.geo.Geospatial; import org.apache.olingo.commons.api.format.ContentType; import org.apache.olingo.commons.api.serialization.ODataDeserializer; import org.apache.olingo.commons.api.serialization.ODataDeserializerException; import org.apache.olingo.commons.core.data.AbstractODataObject; import org.apache.olingo.commons.core.data.AnnotationImpl; import org.apache.olingo.commons.core.data.DeletedEntityImpl; import org.apache.olingo.commons.core.data.DeltaLinkImpl; import org.apache.olingo.commons.core.data.EntityImpl; import org.apache.olingo.commons.core.data.EntitySetImpl; import org.apache.olingo.commons.core.data.LinkImpl; import org.apache.olingo.commons.core.data.LinkedComplexValueImpl; import org.apache.olingo.commons.core.data.PropertyImpl; import org.apache.olingo.commons.core.data.v3.LinkCollectionImpl; import org.apache.olingo.commons.core.data.v4.DeltaImpl; import org.apache.olingo.commons.core.edm.EdmTypeInfo; import javax.xml.namespace.QName; import javax.xml.stream.XMLEventReader; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamException; import javax.xml.stream.events.Attribute; import javax.xml.stream.events.StartElement; import javax.xml.stream.events.XMLEvent; import java.io.InputStream; import java.net.URI; import java.text.ParseException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class AtomDeserializer extends AbstractAtomDealer implements ODataDeserializer { protected static final XMLInputFactory FACTORY = new InputFactoryImpl(); private final AtomGeoValueDeserializer geoDeserializer; protected XMLEventReader getReader(final InputStream input) throws XMLStreamException { return FACTORY.createXMLEventReader(input); } public AtomDeserializer(final ODataServiceVersion version) { super(version); geoDeserializer = new AtomGeoValueDeserializer(); } private Object fromPrimitive(final XMLEventReader reader, final StartElement start, final EdmTypeInfo typeInfo) throws XMLStreamException, EdmPrimitiveTypeException { Object value = null; boolean foundEndProperty = false; while (reader.hasNext() && !foundEndProperty) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement() && typeInfo != null && typeInfo.getPrimitiveTypeKind().isGeospatial()) { final EdmPrimitiveTypeKind geoType = EdmPrimitiveTypeKind.valueOfFQN(version, typeInfo.getFullQualifiedName().toString()); value = geoDeserializer.deserialize(reader, event.asStartElement(), geoType); } if (event.isCharacters() && !event.asCharacters().isWhiteSpace() && (typeInfo == null || !typeInfo.getPrimitiveTypeKind().isGeospatial())) { final String stringValue = event.asCharacters().getData(); value = typeInfo == null ? stringValue : // TODO: add facets ((EdmPrimitiveType) typeInfo.getType()).valueOfString(stringValue, true, null, Constants.DEFAULT_PRECISION, Constants.DEFAULT_SCALE, true, ((EdmPrimitiveType) typeInfo.getType()).getDefaultType()); } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndProperty = true; } } return value; } @SuppressWarnings("unchecked") private Object fromComplexOrEnum(final XMLEventReader reader, final StartElement start) throws XMLStreamException, EdmPrimitiveTypeException { Object value = null; boolean foundEndProperty = false; while (reader.hasNext() && !foundEndProperty) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { if (value == null) { value = version.compareTo(ODataServiceVersion.V40) < 0 ? new ArrayList<Property>() : new LinkedComplexValueImpl(); } if (Constants.QNAME_ATOM_ELEM_LINK.equals(event.asStartElement().getName())) { final LinkImpl link = new LinkImpl(); final Attribute rel = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_REL)); if (rel != null) { link.setRel(rel.getValue()); } final Attribute title = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TITLE)); if (title != null) { link.setTitle(title.getValue()); } final Attribute href = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_HREF)); if (href != null) { link.setHref(href.getValue()); } final Attribute type = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TYPE)); if (type != null) { link.setType(type.getValue()); } if (link.getRel().startsWith( version.getNamespace(ODataServiceVersion.NamespaceKey.NAVIGATION_LINK_REL))) { ((LinkedComplexValue) value).getNavigationLinks().add(link); inline(reader, event.asStartElement(), link); } else if (link.getRel().startsWith( version.getNamespace(ODataServiceVersion.NamespaceKey.ASSOCIATION_LINK_REL))) { ((Valuable) value).asLinkedComplex().getAssociationLinks().add(link); } } else { (value instanceof LinkedComplexValue ? ((LinkedComplexValue) value).getValue() : (List<Property>) value).add(property(reader, event.asStartElement())); } } if (event.isCharacters() && !event.asCharacters().isWhiteSpace()) { value = event.asCharacters().getData(); } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndProperty = true; } } return value; } private void fromCollection(final Valuable valuable, final XMLEventReader reader, final StartElement start, final EdmTypeInfo typeInfo) throws XMLStreamException, EdmPrimitiveTypeException { List<Object> values = new ArrayList<Object>(); ValueType valueType = ValueType.COLLECTION_PRIMITIVE; final EdmTypeInfo type = typeInfo == null ? null : new EdmTypeInfo.Builder().setTypeExpression(typeInfo.getFullQualifiedName().toString()).build(); boolean foundEndProperty = false; while (reader.hasNext() && !foundEndProperty) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { switch (guessPropertyType(reader, typeInfo)) { case COMPLEX: final Object complexValue = fromComplexOrEnum(reader, event.asStartElement()); valueType = complexValue instanceof LinkedComplexValue ? ValueType.COLLECTION_LINKED_COMPLEX : ValueType.COLLECTION_COMPLEX; values.add(complexValue); break; case ENUM: valueType = ValueType.COLLECTION_ENUM; values.add(fromComplexOrEnum(reader, event.asStartElement())); break; case PRIMITIVE: final Object value = fromPrimitive(reader, event.asStartElement(), type); valueType = value instanceof Geospatial ? ValueType.COLLECTION_GEOSPATIAL : ValueType.COLLECTION_PRIMITIVE; values.add(value); break; default: // do not add null or empty values } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndProperty = true; } } valuable.setValue(valueType, values); } private ODataPropertyType guessPropertyType(final XMLEventReader reader, final EdmTypeInfo typeInfo) throws XMLStreamException { XMLEvent child = null; while (reader.hasNext() && child == null) { final XMLEvent event = reader.peek(); if (event.isCharacters() && event.asCharacters().isWhiteSpace()) { reader.nextEvent(); } else { child = event; } } final ODataPropertyType type; if (child == null) { type = typeInfo == null || typeInfo.isPrimitiveType() ? ODataPropertyType.PRIMITIVE : ODataPropertyType.ENUM; } else { if (child.isStartElement()) { if (Constants.NS_GML.equals(child.asStartElement().getName().getNamespaceURI())) { type = ODataPropertyType.PRIMITIVE; } else if (elementQName.equals(child.asStartElement().getName())) { type = ODataPropertyType.COLLECTION; } else { type = ODataPropertyType.COMPLEX; } } else if (child.isCharacters()) { type = typeInfo == null || typeInfo.isPrimitiveType() ? ODataPropertyType.PRIMITIVE : ODataPropertyType.ENUM; } else { type = ODataPropertyType.EMPTY; } } return type; } private Property property(final XMLEventReader reader, final StartElement start) throws XMLStreamException, EdmPrimitiveTypeException { final PropertyImpl property = new PropertyImpl(); if (ODataServiceVersion.V40 == version && propertyValueQName.equals(start.getName())) { // retrieve name from context final Attribute context = start.getAttributeByName(contextQName); if (context != null) { property.setName(StringUtils.substringAfterLast(context.getValue(), "/")); } } else { property.setName(start.getName().getLocalPart()); } valuable(property, reader, start); return property; } private void valuable(final Valuable valuable, final XMLEventReader reader, final StartElement start) throws XMLStreamException, EdmPrimitiveTypeException { final Attribute nullAttr = start.getAttributeByName(nullQName); final Attribute typeAttr = start.getAttributeByName(typeQName); final String typeAttrValue = typeAttr == null ? null : typeAttr.getValue(); final EdmTypeInfo typeInfo = StringUtils.isBlank(typeAttrValue) ? null : new EdmTypeInfo.Builder().setTypeExpression(typeAttrValue).build(); if (typeInfo != null) { valuable.setType(typeInfo.internal()); } final ODataPropertyType propType = typeInfo == null ? guessPropertyType(reader, typeInfo) : typeInfo.isCollection() ? ODataPropertyType.COLLECTION : typeInfo.isPrimitiveType() ? ODataPropertyType.PRIMITIVE : ODataPropertyType.COMPLEX; if (nullAttr == null) { switch (propType) { case COLLECTION: fromCollection(valuable, reader, start, typeInfo); break; case COMPLEX: final Object complexValue = fromComplexOrEnum(reader, start); valuable.setValue( complexValue instanceof LinkedComplexValue ? ValueType.LINKED_COMPLEX : complexValue instanceof List<?> ? ValueType.COMPLEX : ValueType.ENUM, complexValue); break; case PRIMITIVE: // No type specified? Defaults to Edm.String if (typeInfo == null) { valuable.setType(EdmPrimitiveTypeKind.String.getFullQualifiedName().toString()); } final Object value = fromPrimitive(reader, start, typeInfo); valuable.setValue(value instanceof Geospatial ? ValueType.GEOSPATIAL : ValueType.PRIMITIVE, value); break; case EMPTY: default: valuable.setValue(ValueType.PRIMITIVE, StringUtils.EMPTY); } } else { valuable.setValue(propType == ODataPropertyType.PRIMITIVE ? ValueType.PRIMITIVE : propType == ODataPropertyType.ENUM ? ValueType.ENUM : propType == ODataPropertyType.COMPLEX ? ValueType.COMPLEX : propType == ODataPropertyType.COLLECTION ? ValueType.COLLECTION_PRIMITIVE : ValueType.PRIMITIVE, null); } } @Override public ResWrap<Property> toProperty(final InputStream input) throws ODataDeserializerException { try { final XMLEventReader reader = getReader(input); final StartElement start = skipBeforeFirstStartElement(reader); return getContainer(start, property(reader, start)); } catch (XMLStreamException e) { throw new ODataDeserializerException(e); } catch (final EdmPrimitiveTypeException e) { throw new ODataDeserializerException(e); } } private StartElement skipBeforeFirstStartElement(final XMLEventReader reader) throws XMLStreamException { StartElement startEvent = null; while (reader.hasNext() && startEvent == null) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { startEvent = event.asStartElement(); } } if (startEvent == null) { throw new IllegalArgumentException("Cannot find any XML start element"); } return startEvent; } private void common(final XMLEventReader reader, final StartElement start, final AbstractODataObject object, final String key) throws XMLStreamException { boolean foundEndElement = false; while (reader.hasNext() && !foundEndElement) { final XMLEvent event = reader.nextEvent(); if (event.isCharacters() && !event.asCharacters().isWhiteSpace()) { try { object.setCommonProperty(key, event.asCharacters().getData()); } catch (ParseException e) { throw new XMLStreamException("While parsing Atom entry or feed common elements", e); } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndElement = true; } } } private void inline(final XMLEventReader reader, final StartElement start, final LinkImpl link) throws XMLStreamException, EdmPrimitiveTypeException { boolean foundEndElement = false; while (reader.hasNext() && !foundEndElement) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { if (inlineQName.equals(event.asStartElement().getName())) { StartElement inline = null; while (reader.hasNext() && inline == null) { final XMLEvent innerEvent = reader.peek(); if (innerEvent.isCharacters() && innerEvent.asCharacters().isWhiteSpace()) { reader.nextEvent(); } else if (innerEvent.isStartElement()) { inline = innerEvent.asStartElement(); } } if (inline != null) { if (Constants.QNAME_ATOM_ELEM_ENTRY.equals(inline.getName())) { link.setInlineEntity(entity(reader, inline)); } if (Constants.QNAME_ATOM_ELEM_FEED.equals(inline.getName())) { link.setInlineEntitySet(entitySet(reader, inline)); } } } else if (annotationQName.equals(event.asStartElement().getName())) { link.getAnnotations().add(annotation(reader, event.asStartElement())); } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndElement = true; } } } public ResWrap<Delta> delta(final InputStream input) throws XMLStreamException, EdmPrimitiveTypeException { final XMLEventReader reader = getReader(input); final StartElement start = skipBeforeFirstStartElement(reader); return getContainer(start, delta(reader, start)); } private Delta delta(final XMLEventReader reader, final StartElement start) throws XMLStreamException, EdmPrimitiveTypeException { if (!Constants.QNAME_ATOM_ELEM_FEED.equals(start.getName())) { return null; } final DeltaImpl delta = new DeltaImpl(); final Attribute xmlBase = start.getAttributeByName(Constants.QNAME_ATTR_XML_BASE); if (xmlBase != null) { delta.setBaseURI(xmlBase.getValue()); } boolean foundEndFeed = false; while (reader.hasNext() && !foundEndFeed) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { if (countQName.equals(event.asStartElement().getName())) { count(reader, event.asStartElement(), delta); } else if (Constants.QNAME_ATOM_ELEM_ID.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), delta, "id"); } else if (Constants.QNAME_ATOM_ELEM_TITLE.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), delta, "title"); } else if (Constants.QNAME_ATOM_ELEM_SUMMARY.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), delta, "summary"); } else if (Constants.QNAME_ATOM_ELEM_UPDATED.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), delta, "updated"); } else if (Constants.QNAME_ATOM_ELEM_LINK.equals(event.asStartElement().getName())) { final Attribute rel = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_REL)); if (rel != null) { if (Constants.NEXT_LINK_REL.equals(rel.getValue())) { final Attribute href = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_HREF)); if (href != null) { delta.setNext(URI.create(href.getValue())); } } if (ODataServiceVersion.V40.getNamespace(NamespaceKey.DELTA_LINK_REL) .equals(rel.getValue())) { final Attribute href = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_HREF)); if (href != null) { delta.setDeltaLink(URI.create(href.getValue())); } } } } else if (Constants.QNAME_ATOM_ELEM_ENTRY.equals(event.asStartElement().getName())) { delta.getEntities().add(entity(reader, event.asStartElement())); } else if (deletedEntryQName.equals(event.asStartElement().getName())) { final DeletedEntityImpl deletedEntity = new DeletedEntityImpl(); final Attribute ref = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_REF)); if (ref != null) { deletedEntity.setId(URI.create(ref.getValue())); } final Attribute reason = event.asStartElement().getAttributeByName(reasonQName); if (reason != null) { deletedEntity.setReason(Reason.valueOf(reason.getValue())); } delta.getDeletedEntities().add(deletedEntity); } else if (linkQName.equals(event.asStartElement().getName()) || deletedLinkQName.equals(event.asStartElement().getName())) { final DeltaLinkImpl link = new DeltaLinkImpl(); final Attribute source = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_SOURCE)); if (source != null) { link.setSource(URI.create(source.getValue())); } final Attribute relationship = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_RELATIONSHIP)); if (relationship != null) { link.setRelationship(relationship.getValue()); } final Attribute target = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TARGET)); if (target != null) { link.setTarget(URI.create(target.getValue())); } if (linkQName.equals(event.asStartElement().getName())) { delta.getAddedLinks().add(link); } else { delta.getDeletedLinks().add(link); } } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndFeed = true; } } return delta; } public ResWrap<LinkCollection> linkCollection(final InputStream input) throws XMLStreamException { final XMLEventReader reader = getReader(input); final StartElement start = skipBeforeFirstStartElement(reader); return getContainer(start, linkCollection(reader)); } private LinkCollection linkCollection(final XMLEventReader reader) throws XMLStreamException { final LinkCollectionImpl linkCollection = new LinkCollectionImpl(); boolean isURI = false; boolean isNext = false; while (reader.hasNext()) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { isURI = uriQName.equals(event.asStartElement().getName()); isNext = nextQName.equals(event.asStartElement().getName()); } if (event.isCharacters() && !event.asCharacters().isWhiteSpace()) { if (isURI) { linkCollection.getLinks().add(URI.create(event.asCharacters().getData())); isURI = false; } else if (isNext) { linkCollection.setNext(URI.create(event.asCharacters().getData())); isNext = false; } } } return linkCollection; } private void properties(final XMLEventReader reader, final StartElement start, final EntityImpl entity) throws XMLStreamException, EdmPrimitiveTypeException { final Map<String, List<Annotation>> annotations = new HashMap<String, List<Annotation>>(); boolean foundEndProperties = false; while (reader.hasNext() && !foundEndProperties) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { if (annotationQName.equals(event.asStartElement().getName())) { final String target = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TARGET)).getValue(); if (!annotations.containsKey(target)) { annotations.put(target, new ArrayList<Annotation>()); } annotations.get(target).add(annotation(reader, event.asStartElement())); } else { entity.getProperties().add(property(reader, event.asStartElement())); } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndProperties = true; } } for (Property property : entity.getProperties()) { if (annotations.containsKey(property.getName())) { property.getAnnotations().addAll(annotations.get(property.getName())); } } } private Annotation annotation(final XMLEventReader reader, final StartElement start) throws XMLStreamException, EdmPrimitiveTypeException { final Annotation annotation = new AnnotationImpl(); annotation.setTerm(start.getAttributeByName(QName.valueOf(Constants.ATOM_ATTR_TERM)).getValue()); valuable(annotation, reader, start); return annotation; } private EntityImpl entityRef(final StartElement start) throws XMLStreamException { final EntityImpl entity = new EntityImpl(); final Attribute entityRefId = start.getAttributeByName(Constants.QNAME_ATOM_ATTR_ID); if (entityRefId != null) { entity.setId(URI.create(entityRefId.getValue())); } return entity; } private Entity entity(final XMLEventReader reader, final StartElement start) throws XMLStreamException, EdmPrimitiveTypeException { final EntityImpl entity; if (entryRefQName.equals(start.getName())) { entity = entityRef(start); } else if (Constants.QNAME_ATOM_ELEM_ENTRY.equals(start.getName())) { entity = new EntityImpl(); final Attribute xmlBase = start.getAttributeByName(Constants.QNAME_ATTR_XML_BASE); if (xmlBase != null) { entity.setBaseURI(xmlBase.getValue()); } final Attribute etag = start.getAttributeByName(etagQName); if (etag != null) { entity.setETag(etag.getValue()); } boolean foundEndEntry = false; while (reader.hasNext() && !foundEndEntry) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { if (Constants.QNAME_ATOM_ELEM_ID.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entity, "id"); } else if (Constants.QNAME_ATOM_ELEM_TITLE.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entity, "title"); } else if (Constants.QNAME_ATOM_ELEM_SUMMARY.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entity, "summary"); } else if (Constants.QNAME_ATOM_ELEM_UPDATED.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entity, "updated"); } else if (Constants.QNAME_ATOM_ELEM_CATEGORY.equals(event.asStartElement().getName())) { final Attribute term = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATOM_ATTR_TERM)); if (term != null) { entity.setType(new EdmTypeInfo.Builder().setTypeExpression(term.getValue()).build() .internal()); } } else if (Constants.QNAME_ATOM_ELEM_LINK.equals(event.asStartElement().getName())) { final LinkImpl link = new LinkImpl(); final Attribute rel = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_REL)); if (rel != null) { link.setRel(rel.getValue()); } final Attribute title = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TITLE)); if (title != null) { link.setTitle(title.getValue()); } final Attribute href = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_HREF)); if (href != null) { link.setHref(href.getValue()); } final Attribute type = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TYPE)); if (type != null) { link.setType(type.getValue()); } if (Constants.SELF_LINK_REL.equals(link.getRel())) { entity.setSelfLink(link); } else if (Constants.EDIT_LINK_REL.equals(link.getRel())) { entity.setEditLink(link); } else if (Constants.EDITMEDIA_LINK_REL.equals(link.getRel())) { final Attribute mediaETag = event.asStartElement().getAttributeByName(etagQName); if (mediaETag != null) { entity.setMediaETag(mediaETag.getValue()); } } else if (link.getRel().startsWith( version.getNamespace(ODataServiceVersion.NamespaceKey.NAVIGATION_LINK_REL))) { entity.getNavigationLinks().add(link); inline(reader, event.asStartElement(), link); } else if (link.getRel().startsWith( version.getNamespace(ODataServiceVersion.NamespaceKey.ASSOCIATION_LINK_REL))) { entity.getAssociationLinks().add(link); } else if (link.getRel().startsWith( version.getNamespace(ODataServiceVersion.NamespaceKey.MEDIA_EDIT_LINK_REL))) { final Attribute metag = event.asStartElement().getAttributeByName(etagQName); if (metag != null) { link.setMediaETag(metag.getValue()); } entity.getMediaEditLinks().add(link); } } else if (actionQName.equals(event.asStartElement().getName())) { final ODataOperation operation = new ODataOperation(); final Attribute metadata = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_METADATA)); if (metadata != null) { operation.setMetadataAnchor(metadata.getValue()); } final Attribute title = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TITLE)); if (title != null) { operation.setTitle(title.getValue()); } final Attribute target = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TARGET)); if (target != null) { operation.setTarget(URI.create(target.getValue())); } entity.getOperations().add(operation); } else if (Constants.QNAME_ATOM_ELEM_CONTENT.equals(event.asStartElement().getName())) { final Attribute type = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_TYPE)); if (type == null || ContentType.APPLICATION_XML.equals(type.getValue())) { properties(reader, skipBeforeFirstStartElement(reader), entity); } else { entity.setMediaContentType(type.getValue()); final Attribute src = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATOM_ATTR_SRC)); if (src != null) { entity.setMediaContentSource(URI.create(src.getValue())); } } } else if (propertiesQName.equals(event.asStartElement().getName())) { properties(reader, event.asStartElement(), entity); } else if (annotationQName.equals(event.asStartElement().getName())) { entity.getAnnotations().add(annotation(reader, event.asStartElement())); } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndEntry = true; } } } else { entity = null; } return entity; } @Override public ResWrap<Entity> toEntity(final InputStream input) throws ODataDeserializerException { try { final XMLEventReader reader = getReader(input); final StartElement start = skipBeforeFirstStartElement(reader); final Entity entity = entity(reader, start); if (entity == null) { throw new ODataDeserializerException("No entity found!"); } else { return getContainer(start, entity); } } catch (XMLStreamException e) { throw new ODataDeserializerException(e); } catch (final EdmPrimitiveTypeException e) { throw new ODataDeserializerException(e); } } private void count(final XMLEventReader reader, final StartElement start, final EntitySet entitySet) throws XMLStreamException { boolean foundEndElement = false; while (reader.hasNext() && !foundEndElement) { final XMLEvent event = reader.nextEvent(); if (event.isCharacters() && !event.asCharacters().isWhiteSpace()) { entitySet.setCount(Integer.valueOf(event.asCharacters().getData())); } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndElement = true; } } } private EntitySet entitySet(final XMLEventReader reader, final StartElement start) throws XMLStreamException, EdmPrimitiveTypeException { if (!Constants.QNAME_ATOM_ELEM_FEED.equals(start.getName())) { return null; } final EntitySetImpl entitySet = new EntitySetImpl(); final Attribute xmlBase = start.getAttributeByName(Constants.QNAME_ATTR_XML_BASE); if (xmlBase != null) { entitySet.setBaseURI(xmlBase.getValue()); } boolean foundEndFeed = false; while (reader.hasNext() && !foundEndFeed) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { if (countQName.equals(event.asStartElement().getName())) { count(reader, event.asStartElement(), entitySet); } else if (Constants.QNAME_ATOM_ELEM_ID.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entitySet, "id"); } else if (Constants.QNAME_ATOM_ELEM_TITLE.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entitySet, "title"); } else if (Constants.QNAME_ATOM_ELEM_SUMMARY.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entitySet, "summary"); } else if (Constants.QNAME_ATOM_ELEM_UPDATED.equals(event.asStartElement().getName())) { common(reader, event.asStartElement(), entitySet, "updated"); } else if (Constants.QNAME_ATOM_ELEM_LINK.equals(event.asStartElement().getName())) { final Attribute rel = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_REL)); if (rel != null) { if (Constants.NEXT_LINK_REL.equals(rel.getValue())) { final Attribute href = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_HREF)); if (href != null) { entitySet.setNext(URI.create(href.getValue())); } } if (ODataServiceVersion.V40.getNamespace(NamespaceKey.DELTA_LINK_REL) .equals(rel.getValue())) { final Attribute href = event.asStartElement() .getAttributeByName(QName.valueOf(Constants.ATTR_HREF)); if (href != null) { entitySet.setDeltaLink(URI.create(href.getValue())); } } } } else if (Constants.QNAME_ATOM_ELEM_ENTRY.equals(event.asStartElement().getName())) { entitySet.getEntities().add(entity(reader, event.asStartElement())); } else if (entryRefQName.equals(event.asStartElement().getName())) { entitySet.getEntities().add(entityRef(event.asStartElement())); } else if (annotationQName.equals(event.asStartElement().getName())) { entitySet.getAnnotations().add(annotation(reader, event.asStartElement())); } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndFeed = true; } } return entitySet; } @Override public ResWrap<EntitySet> toEntitySet(final InputStream input) throws ODataDeserializerException { try { final XMLEventReader reader = getReader(input); final StartElement start = skipBeforeFirstStartElement(reader); return getContainer(start, entitySet(reader, start)); } catch (XMLStreamException e) { throw new ODataDeserializerException(e); } catch (final EdmPrimitiveTypeException e) { throw new ODataDeserializerException(e); } } private ODataError error(final XMLEventReader reader, final StartElement start) throws XMLStreamException { final ODataError error = new ODataError(); boolean setCode = false; boolean codeSet = false; boolean setMessage = false; boolean messageSet = false; boolean setTarget = false; boolean targetSet = false; boolean foundEndElement = false; while (reader.hasNext() && !foundEndElement) { final XMLEvent event = reader.nextEvent(); if (event.isStartElement()) { if (errorCodeQName.equals(event.asStartElement().getName())) { setCode = true; } else if (errorMessageQName.equals(event.asStartElement().getName())) { setMessage = true; } else if (errorTargetQName.equals(event.asStartElement().getName())) { setTarget = true; } } if (event.isCharacters() && !event.asCharacters().isWhiteSpace()) { if (setCode && !codeSet) { error.setCode(event.asCharacters().getData()); setCode = false; codeSet = true; } if (setMessage && !messageSet) { error.setMessage(event.asCharacters().getData()); setMessage = false; messageSet = true; } if (setTarget && !targetSet) { error.setTarget(event.asCharacters().getData()); setTarget = false; targetSet = true; } } if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) { foundEndElement = true; } } return error; } @Override public ODataError toError(final InputStream input) throws ODataDeserializerException { try { final XMLEventReader reader = getReader(input); final StartElement start = skipBeforeFirstStartElement(reader); return error(reader, start); } catch (XMLStreamException e) { throw new ODataDeserializerException(e); } } private <T> ResWrap<T> getContainer(final StartElement start, final T object) { final Attribute context = start.getAttributeByName(contextQName); final Attribute metadataETag = start.getAttributeByName(metadataEtagQName); return new ResWrap<T>(context == null ? null : URI.create(context.getValue()), metadataETag == null ? null : metadataETag.getValue(), object); } }