/*
* Copyright 2010 Outerthought bvba
*
* Licensed 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.lilyproject.rest.providers.json;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.node.ArrayNode;
import org.codehaus.jackson.node.ObjectNode;
import org.lilyproject.repository.api.CompareOp;
import org.lilyproject.repository.api.FieldType;
import org.lilyproject.repository.api.LRepository;
import org.lilyproject.repository.api.MutationCondition;
import org.lilyproject.repository.api.QName;
import org.lilyproject.repository.api.RepositoryException;
import org.lilyproject.rest.BaseRepositoryResource;
import org.lilyproject.rest.PostAction;
import org.lilyproject.rest.ResourceException;
import org.lilyproject.tools.import_.json.JsonFormatException;
import org.lilyproject.tools.import_.json.LinkTransformer;
import org.lilyproject.tools.import_.json.Namespaces;
import org.lilyproject.tools.import_.json.NamespacesConverter;
import org.lilyproject.tools.import_.json.QNameConverter;
import org.lilyproject.tools.import_.json.RecordReader;
import org.lilyproject.util.json.JsonFormat;
import org.lilyproject.util.json.JsonUtil;
import org.lilyproject.util.repo.SystemFields;
import org.springframework.beans.factory.annotation.Autowired;
import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
import static javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR;
@Provider
public class PostActionMessageBodyReader extends BaseRepositoryResource implements MessageBodyReader<PostAction> {
private LinkTransformer linkTransformer;
@Override
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
if (type.equals(PostAction.class) && mediaType.isCompatible(MediaType.APPLICATION_JSON_TYPE)) {
if (genericType instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType)genericType;
Type[] types = pt.getActualTypeArguments();
if (types.length == 1 && EntityRegistry.SUPPORTED_TYPES.containsKey(types[0])) {
return true;
}
}
}
return false;
}
@Override
public PostAction readFrom(Class<PostAction> type, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
throws IOException, WebApplicationException {
Type entityType = ((ParameterizedType)genericType).getActualTypeArguments()[0];
JsonNode node = null;
try {
node = JsonFormat.deserializeNonStd(entityStream);
} catch (JsonParseException e) {
throw new ResourceException(e, BAD_REQUEST.getStatusCode());
}
if (!(node instanceof ObjectNode)) {
throw new ResourceException("Request body should be a JSON object.", BAD_REQUEST.getStatusCode());
}
ObjectNode postNode = (ObjectNode)node;
String action = JsonUtil.getString(postNode, "action");
List<MutationCondition> conditions;
Object entity = null;
try {
Namespaces namespaces = NamespacesConverter.fromContextJsonIfAvailable(postNode);
conditions = readMutationConditions(postNode, namespaces);
// Hardcoded behavior that action 'delete' does not need a submitted entity (and any other does)
if (!action.equals("delete")) {
EntityRegistry.RegistryEntry registryEntry = EntityRegistry.findReaderRegistryEntry((Class)entityType);
ObjectNode objectNode = JsonUtil.getObject(postNode, registryEntry.getPropertyName());
// Multiple repositories: ok to use public repo since only non-repository-specific things are needed
entity = EntityRegistry.findReader((Class)entityType).fromJson(objectNode, namespaces,
repositoryMgr.getDefaultRepository(), linkTransformer);
}
} catch (JsonFormatException e) {
throw new ResourceException("Error in submitted JSON.", e, BAD_REQUEST.getStatusCode());
} catch (Exception e) {
throw new ResourceException("Error reading submitted JSON.", e, INTERNAL_SERVER_ERROR.getStatusCode());
}
return new PostAction(action, entity, conditions);
}
private List<MutationCondition> readMutationConditions(ObjectNode postNode, Namespaces namespaces)
throws JsonFormatException, RepositoryException, InterruptedException, IOException {
ArrayNode conditions = JsonUtil.getArray(postNode, "conditions", null);
if (conditions == null) {
return null;
}
// Multiple repositories: ok to use public repo since only non-repository-specific things are needed
LRepository repository = repositoryMgr.getDefaultRepository();
List<MutationCondition> result = new ArrayList<MutationCondition>();
SystemFields systemFields = SystemFields.getInstance(repository.getTypeManager(), repository.getIdGenerator());
for (int i = 0; i < conditions.size(); i++) {
JsonNode conditionNode = conditions.get(i);
if (!conditionNode.isObject()) {
throw new JsonFormatException("Each element in the conditions array should be an object.");
}
QName fieldName = QNameConverter.fromJson(JsonUtil.getString(conditionNode, "field"), namespaces);
JsonNode valueNode = conditionNode.get("value");
Object value = null;
if (!valueNode.isNull()) {
FieldType fieldType = systemFields.isSystemField(fieldName) ? systemFields.get(fieldName) :
repository.getTypeManager().getFieldTypeByName(fieldName);
value = RecordReader.INSTANCE.readValue(
new RecordReader.ValueHandle(valueNode, "value", fieldType.getValueType()),
new RecordReader.ReadContext(repositoryMgr.getDefaultRepository(), namespaces,linkTransformer));
}
boolean allowMissing = JsonUtil.getBoolean(conditionNode, "allowMissing", false);
String operator = JsonUtil.getString(conditionNode, "operator", null);
CompareOp op = CompareOp.EQUAL;
if (operator != null) {
try {
op = CompareOp.valueOf(operator.toUpperCase());
} catch (IllegalArgumentException e) {
throw new JsonFormatException("Invalid comparison operator in mutation condition: " + operator);
}
}
MutationCondition condition = new MutationCondition(fieldName, op, value, allowMissing);
result.add(condition);
}
return result;
}
@Autowired
public void setLinkTransformer(LinkTransformer linkTransformer) {
this.linkTransformer = linkTransformer;
}
}