/*
* 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.usergrid.corepersistence.util;
import java.io.IOException;
import java.io.Serializable;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Preconditions;
/**
* An utility class to serialize and de-serialized objects as json strings
*/
public final class ObjectJsonSerializer {
private static final JsonFactory JSON_FACTORY = new JsonFactory();
private static final ObjectMapper MAPPER = new ObjectMapper( JSON_FACTORY );
static{
/**
* Because of the way SNS escapes all our json, we have to tell jackson to accept it. See the documentation
* here for how SNS borks the message body
*
* http://docs.aws.amazon.com/sns/latest/dg/SendMessageToHttp.html
*/
MAPPER.configure( JsonParser.Feature.ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER, true );
}
/**
* Singleton instance of our serializer, instantiating it and configuring the mapper is expensive.
*/
public static final ObjectJsonSerializer INSTANCE = new ObjectJsonSerializer();
private ObjectJsonSerializer( ) {
}
public <T extends Serializable> String toString( final T toSerialize ) {
Preconditions.checkNotNull( toSerialize, "toSerialize must not be null" );
final String stringValue;
//mark this version as empty
//Convert to internal entity map
try {
stringValue = MAPPER.writeValueAsString( toSerialize );
}
catch ( JsonProcessingException jpe ) {
throw new RuntimeException( "Unable to serialize entity", jpe );
}
return stringValue;
}
public <T> String toString( final T toSerialize ) {
Preconditions.checkNotNull( toSerialize, "toSerialize must not be null" );
final String stringValue;
//mark this version as empty
//Convert to internal entity map
try {
stringValue = MAPPER.writeValueAsString( toSerialize );
}
catch ( JsonProcessingException jpe ) {
throw new RuntimeException( "Unable to serialize entity", jpe );
}
return stringValue;
}
public <T extends Serializable> T fromString( final String value, final Class<T> toSerialize ) {
Preconditions.checkNotNull( value, "value must not be null" );
try {
return MAPPER.readValue( value, toSerialize );
}
catch ( IOException e ) {
throw new RuntimeException( "Unable to deserialize", e );
}
}
}