hadoop JSONProvider 源码
haddop JSONProvider 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/wsrs/JSONProvider.java
/**
* 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.hadoop.lib.wsrs;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.http.JettyUtils;
import org.json.simple.JSONStreamAware;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
@Provider
@Produces(MediaType.APPLICATION_JSON + "; " + JettyUtils.UTF_8)
@InterfaceAudience.Private
public class JSONProvider implements MessageBodyWriter<JSONStreamAware> {
private static final String ENTER = System.getProperty("line.separator");
@Override
public boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
return JSONStreamAware.class.isAssignableFrom(aClass);
}
@Override
public long getSize(JSONStreamAware jsonStreamAware, Class<?> aClass, Type type, Annotation[] annotations,
MediaType mediaType) {
return -1;
}
@Override
public void writeTo(JSONStreamAware jsonStreamAware, Class<?> aClass, Type type, Annotation[] annotations,
MediaType mediaType, MultivaluedMap<String, Object> stringObjectMultivaluedMap,
OutputStream outputStream) throws IOException, WebApplicationException {
Writer writer =
new OutputStreamWriter(outputStream, StandardCharsets.UTF_8);
jsonStreamAware.writeJSONString(writer);
writer.write(ENTER);
writer.flush();
}
}
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