org.camunda.spin.impl.json.jackson.format.JacksonJsonDataFormatReader Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; 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.camunda.spin.impl.json.jackson.format;
import java.io.IOException;
import java.io.Reader;
import java.util.regex.Pattern;
import com.fasterxml.jackson.databind.node.MissingNode;
import org.camunda.spin.impl.json.jackson.JacksonJsonLogger;
import org.camunda.spin.spi.TextBasedDataFormatReader;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* @author Thorben Lindhauer
*/
public class JacksonJsonDataFormatReader extends TextBasedDataFormatReader {
private static final JacksonJsonLogger JSON_LOGGER = JacksonJsonLogger.JSON_TREE_LOGGER;
private static final Pattern INPUT_MATCHING_PATTERN = Pattern.compile("\\A(\\s)*[{\\[]");
protected JacksonJsonDataFormat format;
public JacksonJsonDataFormatReader(JacksonJsonDataFormat format) {
this.format = format;
}
public Object readInput(Reader input) {
ObjectMapper mapper = format.getObjectMapper();
try {
final JsonNode jsonNode = mapper.readTree(input);
if (jsonNode instanceof MissingNode) {
throw new IOException("Input is empty");
}
return jsonNode;
}
catch (JsonProcessingException e) {
throw JSON_LOGGER.unableToParseInput(e);
}
catch (IOException e) {
throw JSON_LOGGER.unableToParseInput(e);
}
}
protected Pattern getInputDetectionPattern() {
return INPUT_MATCHING_PATTERN;
}
}