Sample code

modules/artifacts/module-10/lecture1/DeserializationException.java

@@ -0,0 +1,32 @@
+package lecture1;
+
+@SuppressWarnings("serial")
+public class DeserializationException extends RuntimeException
+{
+	public DeserializationException()
+	{
+		super();
+	}
+
+	public DeserializationException(String message, Throwable cause, boolean enableSuppression,
+			boolean writableStackTrace)
+	{
+		super(message, cause, enableSuppression, writableStackTrace);
+	}
+
+	public DeserializationException(String message, Throwable cause)
+	{
+		super(message, cause);
+	}
+
+	public DeserializationException(String message)
+	{
+		super(message);
+	}
+
+	public DeserializationException(Throwable cause)
+	{
+		super(cause);
+	}
+
+}

modules/artifacts/module-10/lecture1/Product1.java

@@ -0,0 +1,34 @@
+package lecture1;
+
+/**
+ * Sample "flat" data structure that can easily be serialized 
+ * in Comma-separated value (CSV) format, or similarly
+ * using other conventions.
+ */
+public class Product1
+{
+	private String aName;
+	private int aId;
+
+	public Product1(String pName, int pId)
+	{
+		aName = pName;
+		aId = pId;
+	}
+
+	public String getName()
+	{
+		return aName;
+	}
+
+	public int getId()
+	{
+		return aId;
+	}
+
+	@Override
+	public String toString()
+	{
+		return aId + "," + aName;
+	}
+}

modules/artifacts/module-10/lecture1/Product1a.java

@@ -0,0 +1,71 @@
+package lecture1;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.apache.commons.csv.CSVFormat;
+import org.apache.commons.csv.CSVParser;
+import org.apache.commons.csv.CSVRecord;
+
+/**
+ * Sample "flat" data structure that can easily be serialized 
+ * in Comma-separated value (CSV) format, or similarly
+ * using other conventions, more robust and better encapsulated than
+ * product1.
+ */
+public class Product1a
+{
+	private String aName;
+	private int aId;
+
+	public Product1a(String pName, int pId)
+	{
+		aName = pName;
+		aId = pId;
+	}
+
+	public String getName()
+	{
+		return aName;
+	}
+
+	public int getId()
+	{
+		return aId;
+	}
+
+	@Override
+	public String toString()
+	{
+		return aId + "," + aName;
+	}
+
+	public String serialize()
+	{
+		return "\"" + aName + "\"," + aId;
+	}
+
+	public Product1a(String pSerialized)
+	{
+		try
+		{
+			CSVParser parser = CSVParser.parse(pSerialized, CSVFormat.DEFAULT);
+			List<CSVRecord> records = parser.getRecords();
+			if( records.size() != 1 )
+			{
+				throw new DeserializationException();
+			}
+			CSVRecord record = records.get(0);
+			if(record.size() != 2 )
+			{
+				throw new DeserializationException();
+			}
+			aName = record.get(0);
+			aId = Integer.parseInt(record.get(1));
+		}
+		catch(IOException | NumberFormatException e)
+		{
+			throw new DeserializationException(e);
+		}
+	}
+}

modules/artifacts/module-10/lecture1/Product2.java

@@ -0,0 +1,61 @@
+package lecture1;
+
+import java.util.HashMap;
+import java.util.Iterator;
+
+import org.json.JSONObject;
+
+/**
+ * Sample hierarchical structure..
+ */
+public class Product2
+{
+	private String aName;
+	private int aId;
+	private HashMap<String,String> aProperties = new HashMap<>();
+
+	public Product2(String pName, int pId)
+	{
+		aName = pName;
+		aId = pId;
+	}
+
+	public void setProperty(String pKey, String pValue)
+	{
+		aProperties.put(pKey, pValue);
+	}
+
+	public String getProperty(String pKey)
+	{
+		return aProperties.get(pKey);
+	}
+
+	public Iterator<String> getPropertyNames()
+	{
+		return aProperties.keySet().iterator();
+	}
+
+	@Override
+	public String toString()
+	{
+		return aId + "," + aName + " " + aProperties;
+	}
+
+	public JSONObject toJSONObject()
+	{
+		// First a properties object where keys become fields
+		JSONObject properties = new JSONObject();
+		for( String key : aProperties.keySet() )
+		{
+			properties.put(key, aProperties.get(key));
+		}
+
+		// Then construct the actual product object
+		JSONObject product = new JSONObject();
+		product.put("name", aName);
+		product.put("id", aId);
+		product.put("properties", properties);
+
+		return product;
+	}
+}

modules/artifacts/module-10/lecture1/Product2a.java

@@ -0,0 +1,67 @@
+package lecture1;
+
+import java.util.HashMap;
+import java.util.Iterator;
+
+import org.json.JSONObject;
+
+/**
+ * Sample hierarchical structure, initially without links,
+ * but with aRelated added in, demonstrates the weakness
+ * of JSON serialization for graphs.
+ */
+public class Product2a
+{
+	private String aName;
+	private int aId;
+	private HashMap<String,String> aProperties = new HashMap<>();
+	private Product2a aRelated;
+
+	public Product2a(String pName, int pId)
+	{
+		aName = pName;
+		aId = pId;
+	}
+
+	public void setRelated(Product2a p)
+	{
+		aRelated = p;
+	}
+
+	public void setProperty(String pKey, String pValue)
+	{
+		aProperties.put(pKey, pValue);
+	}
+
+	public String getProperties(String pKey)
+	{
+		return aProperties.get(pKey);
+	}
+
+	public Iterator<String> getPropertyNames()
+	{
+		return aProperties.keySet().iterator();
+	}
+
+	public JSONObject toJSONObject()
+	{
+		// First a properties object where keys become fields
+		JSONObject properties = new JSONObject();
+		for( String key : aProperties.keySet() )
+		{
+			properties.put(key, aProperties.get(key));
+		}
+
+		// Then construct the actual product object
+		JSONObject product = new JSONObject();
+		product.put("name", aName);
+		product.put("id", aId);
+		product.put("properties", properties);
+		if( aRelated != null )
+		{
+			product.put("related", aRelated.toJSONObject());
+		}
+
+		return product;
+	}
+}

modules/artifacts/module-10/lecture1/Product3.java

@@ -0,0 +1,75 @@
+package lecture1;
+
+import java.util.HashMap;
+import java.util.Iterator;
+
+/**
+ * Product object in the JavaBeans framework.
+ */
+public class Product3
+{
+	private String aName = "default";
+	private int aId = -1;
+	private HashMap<String,String> aProperties = new HashMap<>();
+	private Product3 aRelated;
+
+	public Product3()
+	{}
+
+	public Product3(String pName, int pId)
+	{
+		aName = pName;
+		aId = pId;
+	}
+
+	public String getName()
+	{
+		return aName;
+	}
+
+	public void setName(String pName)
+	{
+		aName = pName;
+	}
+
+	public int getId()
+	{
+		return aId;
+	}
+
+	public void setId(int pId)
+	{
+		aId = pId;
+	}
+
+	public Product3 getRelated()
+	{
+		return aRelated;
+	}
+
+	public void setRelated(Product3 pRelated)
+	{
+		aRelated = pRelated;
+	}
+
+	public void setProperty(String pKey, String pValue)
+	{
+		aProperties.put(pKey, pValue);
+	}
+
+	public String getProperty(String pKey)
+	{
+		return aProperties.get(pKey);
+	}
+
+	public Iterator<String> getPropertyNames()
+	{
+		return aProperties.keySet().iterator();
+	}
+
+	@Override
+	public String toString()
+	{
+		return aId + "," + aName + " " + aProperties;
+	}
+}

modules/artifacts/module-10/lecture1/Product4.java

@@ -0,0 +1,47 @@
+package lecture1;
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Iterator;
+
+/**
+ */
+public class Product4 implements Serializable
+{
+	private String aName;
+	private int aId;
+	private transient HashMap<String,String> aProperties = new HashMap<>();
+	private Product4 aRelated;
+
+	public Product4(String pName, int pId)
+	{
+		aName = pName;
+		aId = pId;
+	}
+
+	public void setRelated(Product4 p)
+	{
+		aRelated = p;
+	}
+
+	public void setProperty(String pKey, String pValue)
+	{
+		aProperties.put(pKey, pValue);
+	}
+
+	public String getProperties(String pKey)
+	{
+		return aProperties.get(pKey);
+	}
+
+	public Iterator<String> getPropertyNames()
+	{
+		return aProperties.keySet().iterator();
+	}
+
+	@Override
+	public String toString()
+	{
+		return aId + "," + aName + " " + aProperties;
+	}
+}