/
JsonWriter.java
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/
JsonWriter.java
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/*
* Copyright 2008-2009 LinkedIn, Inc
*
* 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 voldemort.serialization.json;
import java.io.IOException;
import java.io.Writer;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Writes JSON Objects as String recognized by {@link JsonReader}
*
* @author bbansal
*
*/
public class JsonWriter {
private final Writer writer;
public JsonWriter(Writer writer) {
this.writer = writer;
}
public void write(Object o) {
try {
if(null == o) {
writer.write("null");
} else if(o instanceof Map) {
writeMap((Map<String, Object>) o);
} else if(o instanceof List) {
writeList((List<Object>) o);
} else if(o instanceof Date) {
writeDate((Date) o);
} else if(o instanceof String) {
writer.write("'");
writer.write((String) o);
writer.write("'");
} else {
writer.write(o.toString());
}
} catch(Exception e) {
throw new RuntimeException("JsonWriter failed to write Object(" + o + ") as String", e);
}
}
public void writeMap(Map<String, Object> values) throws IOException {
writer.write('{');
Set<Map.Entry<String, Object>> entrySet = values.entrySet();
int index = 0;
for(Map.Entry<String, Object> entry: entrySet) {
writer.write("'");
writer.write(entry.getKey());
writer.write("'");
writer.write(':');
// write Object
write(entry.getValue());
if(++index < entrySet.size()) {
writer.write(", ");
}
}
writer.write('}');
}
public void writeList(List<Object> list) throws IOException {
writer.write('[');
int index = 0;
for(Object entry: list) {
write(entry);
if(++index < list.size()) {
writer.write(", ");
}
}
writer.write(']');
}
public void writeDate(Date date) throws IOException {
writer.write("" + date.getTime());
}
}