Java tutorial
/* * Copyright 2011 the original author or authors. * 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 com.jayway.jsonpath.internal.spi.json; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.ObjectReader; import com.jayway.jsonpath.InvalidJsonException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.StringWriter; import java.util.LinkedHashMap; import java.util.LinkedList; import java.util.List; public class JacksonJsonProvider extends AbstractJsonProvider { private static final Logger logger = LoggerFactory.getLogger(JacksonJsonProvider.class); private static final ObjectMapper defaultObjectMapper = new ObjectMapper(); private static final ObjectReader defaultObjectReader = defaultObjectMapper.reader().withType(Object.class); protected ObjectMapper objectMapper; protected ObjectReader objectReader; public ObjectMapper getObjectMapper() { return objectMapper; } /** * Initialize the JacksonProvider with the default ObjectMapper and ObjectReader */ public JacksonJsonProvider() { this(defaultObjectMapper, defaultObjectReader); } /** * Initialize the JacksonProvider with a custom ObjectMapper. * @param objectMapper the ObjectMapper to use */ public JacksonJsonProvider(ObjectMapper objectMapper) { this(objectMapper, objectMapper.reader().withType(Object.class)); } /** * Initialize the JacksonProvider with a custom ObjectMapper and ObjectReader. * @param objectMapper the ObjectMapper to use * @param objectReader the ObjectReader to use */ public JacksonJsonProvider(ObjectMapper objectMapper, ObjectReader objectReader) { this.objectMapper = objectMapper; this.objectReader = objectReader; } @Override public Object parse(String json) throws InvalidJsonException { try { return objectReader.readValue(json); } catch (IOException e) { logger.debug("Invalid JSON: \n" + json); throw new InvalidJsonException(e); } } @Override public Object parse(InputStream jsonStream, String charset) throws InvalidJsonException { try { return objectReader.readValue(new InputStreamReader(jsonStream, charset)); } catch (IOException e) { throw new InvalidJsonException(e); } } @Override public String toJson(Object obj) { StringWriter writer = new StringWriter(); try { JsonGenerator generator = objectMapper.getFactory().createGenerator(writer); objectMapper.writeValue(generator, obj); writer.flush(); writer.close(); generator.close(); return writer.getBuffer().toString(); } catch (IOException e) { throw new InvalidJsonException(); } } @Override public List<Object> createArray() { return new LinkedList<Object>(); } @Override public Object createMap() { return new LinkedHashMap<String, Object>(); } }