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/**
*
* 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.tuscany.samples.sdo.intermediate;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.apache.tuscany.samples.sdo.SampleBase;
import org.apache.tuscany.samples.sdo.internal.SampleInfrastructure;
import commonj.sdo.DataObject;
import commonj.sdo.helper.HelperContext;
/**
* Demonstrates serializing and deserializing a DataObject to disk
* using java serialization.
* <p>
* <h3>Running this Sample</h3> See <A HREF="../../../../../../index.html"
* target="_top">the main overview</A> for instructions on how to run this
* sample.
*/
public class SerializingDeserializingADataObject extends SampleBase {
HelperContext scope;
public SerializingDeserializingADataObject(Integer userLevel) {
super(userLevel, SAMPLE_LEVEL_INTERMEDIATE);
}
public static void main(String[] args) {
SerializingDeserializingADataObject sample =
new SerializingDeserializingADataObject(COMMENTARY_FOR_INTERMEDIATE);
sample.run();
}
/*
* metadata for the sample documenting the areas of SDO that are explored
*/
public static int [] CORE_FUNCTION = {
SDOFacets.JAVA_SERIALIZATION_OF_DATA_GRAPH
};
/*
* metadata for the sample documenting the areas of SDO that are explored
*/
public static int [] SIGNIFICANT_FUNCTION = {
SDOFacets.TESTING_FOR_GRAPH_EQUALITY
};
public void runSample () throws Exception {
commentary(
"Demonstrates serializing and deserializing a DataObject\n" +
"to disk using Java serialization.");
scope = useDefaultScopeForTypes();
loadTypesFromXMLSchemaFile(scope, SampleInfrastructure.COMPANY_XSD);
DataObject company = getDataObjectFromFile(scope, SampleInfrastructure.COMPANY_DATAOBJECT_XML);
commentary("We've loaded a data graph 'company' from a file\n" +
"using XML schema for the model and XML for the graph in the usual manner\n");
String fileName = "temporarySerializedDataObject.xml";
commentary("We've loaded a data graph 'company' from a file\n" +
"using XML schema for the model and XML for the graph in the usual manner\n" +
"Now we are going to serialize it to, and read it from a temporary file: "+fileName);
commentary(
"The following code, which doesn't use any SDO APIs, demonstrates the\n" +
"underlying SDO function of performing Java serialization on SDO objects\n\n" +
"FileOutputStream fos = new FileOutputStream(fileName);\n" +
"ObjectOutputStream out = new ObjectOutputStream(fos);\n" +
"out.writeObject(company);\n" +
"out.close();");
FileOutputStream fos = new FileOutputStream(fileName);
ObjectOutputStream out = new ObjectOutputStream(fos);
out.writeObject(company);
out.close();
// read in DataObject
commentary("Having written the data graph to the temporary file we\n" +
"can read it back\n\n" +
"FileInputStream fis = new FileInputStream(fileName);\n" +
"ObjectInputStream input = new ObjectInputStream(fis);\n" +
"DataObject newDataObject = (DataObject) input.readObject();\n" +
"input.close();");
FileInputStream fis = new FileInputStream(fileName);
ObjectInputStream input = new ObjectInputStream(fis);
DataObject newDataObject = (DataObject) input.readObject();
input.close();
/**
* Compare data graphs
*/
commentary("We can use the SDO EqualityHelper to check that we have got\n" +
"back an equivalent graph to the one we had originally\n\n" +
"boolean equal = scope.getEqualityHelper().equal(company, newDataObject);");
boolean equal = scope.getEqualityHelper().equal(company, newDataObject);
System.out.println("DataObjects are equal: " + equal);
//print out xml representation
System.out.println();
System.out.println("Original company DataObject:");
System.out.println(scope.getXMLHelper().save(company, SampleInfrastructure.COMPANY_NAMESPACE, "company"));
System.out.println();
System.out.println("Deserialized company DataObject:");
System.out.println(scope.getXMLHelper().save(newDataObject, SampleInfrastructure.COMPANY_NAMESPACE, "company"));
}
}
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