/*******************************************************************************
* Copyright (c) 2009-2013 CWI
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* * Jurgen J. Vinju - Jurgen.Vinju@cwi.nl - CWI
* * Mark Hills - Mark.Hills@cwi.nl (CWI)
* * Arnold Lankamp - Arnold.Lankamp@cwi.nl
* * Bert Lisser - Bert.Lisser@cwi.nl
*******************************************************************************/
package org.rascalmpl.library.lang.json;
import java.io.IOException;
import org.eclipse.imp.pdb.facts.IConstructor;
import org.eclipse.imp.pdb.facts.IString;
import org.eclipse.imp.pdb.facts.IValue;
import org.eclipse.imp.pdb.facts.IValueFactory;
import org.eclipse.imp.pdb.facts.type.Type;
import org.eclipse.imp.pdb.facts.type.TypeStore;
import org.rascalmpl.interpreter.IEvaluatorContext;
import org.rascalmpl.interpreter.TypeReifier;
import org.rascalmpl.interpreter.utils.RuntimeExceptionFactory;
import org.rascalmpl.library.lang.json.io.IValueAdapter;
import org.rascalmpl.library.lang.json.io.JSONReadingTypeVisitor;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import com.ibm.icu.text.DateFormat;
public class IO {
private final IValueFactory values;
public IO(IValueFactory values) {
super();
this.values = values;
}
public IString toJSON(IValue value) {
IValueAdapter adap = new IValueAdapter();
Gson gson = new GsonBuilder()
.registerTypeAdapter(IValue.class, adap)
.enableComplexMapKeySerialization()
.setDateFormat(DateFormat.LONG)
.setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
.setVersion(1.0)
.create();
try {
String json = gson.toJson(value, new TypeToken<IValue>() {}.getType());
return values.string(json);
} catch (Exception e) {
throw RuntimeExceptionFactory.io(values.string(e.getMessage()), null, null);
}
}
public IValue fromJSON(IValue type, IString src, IEvaluatorContext ctx) {
TypeStore store = ctx.getCurrentEnvt().getStore();
Type start = new TypeReifier(ctx.getValueFactory()).valueToType((IConstructor) type, store);
Gson gson = new GsonBuilder()
.enableComplexMapKeySerialization()
.setDateFormat(DateFormat.LONG)
.setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
.setVersion(1.0)
.create();
Object obj = gson.fromJson(src.getValue(), Object.class);
try {
return JSONReadingTypeVisitor.read(obj, values, store, start);
}
catch (IOException e) {
throw RuntimeExceptionFactory.io(values.string(e.getMessage()), null, null);
}
}
}