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.client.core.serialization; import java.io.IOException; import java.net.URI; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; import java.util.regex.Matcher; import org.apache.commons.lang3.StringUtils; import org.apache.olingo.client.api.data.ResWrap; import org.apache.olingo.commons.api.Constants; import org.apache.olingo.commons.api.data.Annotation; import org.apache.olingo.commons.api.data.Entity; import org.apache.olingo.commons.api.data.Link; import org.apache.olingo.commons.api.data.Operation; import org.apache.olingo.commons.api.edm.EdmPrimitiveTypeException; import org.apache.olingo.commons.core.edm.EdmTypeInfo; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.node.ObjectNode; /** * Reads JSON string into an entity. * <br/> * If metadata information is available, the corresponding entity fields and content will be populated. */ public class JsonEntityDeserializer extends JsonDeserializer { public JsonEntityDeserializer(final boolean serverMode) { super(serverMode); } protected ResWrap<Entity> doDeserialize(final JsonParser parser) throws IOException { final ObjectNode tree = parser.getCodec().readTree(parser); if (tree.has(Constants.VALUE) && tree.get(Constants.VALUE).isArray()) { throw new JsonParseException("Expected OData Entity, found EntitySet", parser.getCurrentLocation()); } final Entity entity = new Entity(); final URI contextURL; if (tree.hasNonNull(Constants.JSON_CONTEXT)) { contextURL = URI.create(tree.get(Constants.JSON_CONTEXT).textValue()); tree.remove(Constants.JSON_CONTEXT); } else if (tree.hasNonNull(Constants.JSON_METADATA)) { contextURL = URI.create(tree.get(Constants.JSON_METADATA).textValue()); tree.remove(Constants.JSON_METADATA); } else { contextURL = null; } if (contextURL != null) { entity.setBaseURI( URI.create(StringUtils.substringBefore(contextURL.toASCIIString(), Constants.METADATA))); } final String metadataETag; if (tree.hasNonNull(Constants.JSON_METADATA_ETAG)) { metadataETag = tree.get(Constants.JSON_METADATA_ETAG).textValue(); tree.remove(Constants.JSON_METADATA_ETAG); } else { metadataETag = null; } if (tree.hasNonNull(Constants.JSON_ETAG)) { entity.setETag(tree.get(Constants.JSON_ETAG).textValue()); tree.remove(Constants.JSON_ETAG); } if (tree.hasNonNull(Constants.JSON_TYPE)) { entity.setType(new EdmTypeInfo.Builder().setTypeExpression(tree.get(Constants.JSON_TYPE).textValue()) .build().internal()); tree.remove(Constants.JSON_TYPE); } if (tree.hasNonNull(Constants.JSON_ID)) { entity.setId(URI.create(tree.get(Constants.JSON_ID).textValue())); tree.remove(Constants.JSON_ID); } if (tree.hasNonNull(Constants.JSON_READ_LINK)) { final Link link = new Link(); link.setRel(Constants.SELF_LINK_REL); link.setHref(tree.get(Constants.JSON_READ_LINK).textValue()); entity.setSelfLink(link); tree.remove(Constants.JSON_READ_LINK); } if (tree.hasNonNull(Constants.JSON_EDIT_LINK)) { final Link link = new Link(); if (serverMode) { link.setRel(Constants.EDIT_LINK_REL); } link.setHref(tree.get(Constants.JSON_EDIT_LINK).textValue()); entity.setEditLink(link); tree.remove(Constants.JSON_EDIT_LINK); } if (tree.hasNonNull(Constants.JSON_MEDIA_READ_LINK)) { entity.setMediaContentSource(URI.create(tree.get(Constants.JSON_MEDIA_READ_LINK).textValue())); tree.remove(Constants.JSON_MEDIA_READ_LINK); } if (tree.hasNonNull(Constants.JSON_MEDIA_EDIT_LINK)) { entity.setMediaContentSource(URI.create(tree.get(Constants.JSON_MEDIA_EDIT_LINK).textValue())); tree.remove(Constants.JSON_MEDIA_EDIT_LINK); } if (tree.hasNonNull(Constants.JSON_MEDIA_CONTENT_TYPE)) { entity.setMediaContentType(tree.get(Constants.JSON_MEDIA_CONTENT_TYPE).textValue()); tree.remove(Constants.JSON_MEDIA_CONTENT_TYPE); } if (tree.hasNonNull(Constants.JSON_MEDIA_ETAG)) { entity.setMediaETag(tree.get(Constants.JSON_MEDIA_ETAG).textValue()); tree.remove(Constants.JSON_MEDIA_ETAG); } final Set<String> toRemove = new HashSet<String>(); final Map<String, List<Annotation>> annotations = new HashMap<String, List<Annotation>>(); for (final Iterator<Map.Entry<String, JsonNode>> itor = tree.fields(); itor.hasNext();) { final Map.Entry<String, JsonNode> field = itor.next(); final Matcher customAnnotation = CUSTOM_ANNOTATION.matcher(field.getKey()); links(field, entity, toRemove, tree, parser.getCodec()); if (field.getKey().endsWith(getJSONAnnotation(Constants.JSON_MEDIA_READ_LINK))) { final Link link = new Link(); link.setTitle(getTitle(field)); link.setRel(Constants.NS_MEDIA_READ_LINK_REL + getTitle(field)); link.setType(Constants.MEDIA_EDIT_LINK_TYPE); link.setHref(field.getValue().textValue()); entity.getMediaEditLinks().add(link); if (tree.has(link.getTitle() + getJSONAnnotation(Constants.JSON_MEDIA_ETAG))) { link.setMediaETag( tree.get(link.getTitle() + getJSONAnnotation(Constants.JSON_MEDIA_ETAG)).asText()); toRemove.add(link.getTitle() + getJSONAnnotation(Constants.JSON_MEDIA_ETAG)); } if (tree.has(link.getTitle() + getJSONAnnotation(Constants.JSON_MEDIA_CONTENT_TYPE))) { link.setType(tree.get(link.getTitle() + getJSONAnnotation(Constants.JSON_MEDIA_CONTENT_TYPE)) .asText()); toRemove.add(link.getTitle() + getJSONAnnotation(Constants.JSON_MEDIA_CONTENT_TYPE)); } toRemove.add(field.getKey()); toRemove.add(setInline(field.getKey(), getJSONAnnotation(Constants.JSON_MEDIA_READ_LINK), tree, parser.getCodec(), link)); } else if (field.getKey().endsWith(getJSONAnnotation(Constants.JSON_MEDIA_EDIT_LINK))) { final Link link = getOrCreateMediaLink(entity, getTitle(field)); link.setRel(Constants.NS_MEDIA_EDIT_LINK_REL + getTitle(field)); link.setHref(field.getValue().textValue()); toRemove.add(field.getKey()); toRemove.add(setInline(field.getKey(), getJSONAnnotation(Constants.JSON_MEDIA_EDIT_LINK), tree, parser.getCodec(), link)); } else if (field.getKey().endsWith(getJSONAnnotation(Constants.JSON_MEDIA_CONTENT_TYPE))) { final Link link = getOrCreateMediaLink(entity, getTitle(field)); link.setType(field.getValue().asText()); toRemove.add(field.getKey()); } else if (field.getKey().endsWith(getJSONAnnotation(Constants.JSON_MEDIA_ETAG))) { final Link link = getOrCreateMediaLink(entity, getTitle(field)); link.setMediaETag(field.getValue().asText()); toRemove.add(field.getKey()); } else if (field.getKey().charAt(0) == '#') { final Operation operation = new Operation(); operation.setMetadataAnchor(field.getKey()); final ObjectNode opNode = (ObjectNode) tree.get(field.getKey()); operation.setTitle(opNode.get(Constants.ATTR_TITLE).asText()); operation.setTarget(URI.create(opNode.get(Constants.ATTR_TARGET).asText())); entity.getOperations().add(operation); toRemove.add(field.getKey()); } else if (customAnnotation.matches() && !"odata".equals(customAnnotation.group(2))) { final Annotation annotation = new Annotation(); annotation.setTerm(customAnnotation.group(2) + "." + customAnnotation.group(3)); try { value(annotation, field.getValue(), parser.getCodec()); } catch (final EdmPrimitiveTypeException e) { throw new IOException(e); } if (!annotations.containsKey(customAnnotation.group(1))) { annotations.put(customAnnotation.group(1), new ArrayList<Annotation>()); } annotations.get(customAnnotation.group(1)).add(annotation); } } for (Link link : entity.getNavigationLinks()) { if (annotations.containsKey(link.getTitle())) { link.getAnnotations().addAll(annotations.get(link.getTitle())); for (Annotation annotation : annotations.get(link.getTitle())) { toRemove.add(link.getTitle() + "@" + annotation.getTerm()); } } } for (Link link : entity.getMediaEditLinks()) { if (annotations.containsKey(link.getTitle())) { link.getAnnotations().addAll(annotations.get(link.getTitle())); for (Annotation annotation : annotations.get(link.getTitle())) { toRemove.add(link.getTitle() + "@" + annotation.getTerm()); } } } tree.remove(toRemove); try { populate(entity, entity.getProperties(), tree, parser.getCodec()); } catch (final EdmPrimitiveTypeException e) { throw new IOException(e); } return new ResWrap<Entity>(contextURL, metadataETag, entity); } private Link getOrCreateMediaLink(final Entity entity, final String name) { final String rel = Constants.NS_MEDIA_EDIT_LINK_REL + name; for (Link link : entity.getMediaEditLinks()) { if (link.getRel().equals(rel)) { return link; } } final Link link = new Link(); link.setTitle(name); link.setRel(rel); link.setType(Constants.MEDIA_EDIT_LINK_TYPE); entity.getMediaEditLinks().add(link); return link; } }