/*
* @(#)SerialStruct.java 1.6 04/05/29
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.sql.rowset.serial;
import java.sql.*;
import javax.sql.*;
import java.io.*;
import java.math.*;
import java.util.Map;
import java.util.Vector;
import javax.sql.rowset.*;
/**
* A serialized mapping in the Java programming language of an SQL
* structured type. Each attribute that is not already serialized
* is mapped to a serialized form, and if an attribute is itself
* a structured type, each of its attributes that is not already
* serialized is mapped to a serialized form.
* <P>
* In addition, the structured type is custom mapped to a class in the
* Java programming language if there is such a mapping, as are
* its attributes, if appropriate.
* <P>
* The <code>SerialStruct</code> class provides a constructor for creating
* an instance from a <code>Struct</code> object, a method for retrieving
* the SQL type name of the SQL structured type in the database, and methods
* for retrieving its attribute values.
*/
public class SerialStruct implements Struct, Serializable, Cloneable {
/**
* The SQL type name for the structured type that this
* <code>SerialStruct</code> object represents. This is the name
* used in the SQL definition of the SQL structured type.
*
* @serial
*/
private String SQLTypeName;
/**
* An array of <code>Object</code> instances in which each
* element is an attribute of the SQL structured type that this
* <code>SerialStruct</code> object represents. The attributes are
* ordered according to their order in the definition of the
* SQL structured type.
*
* @serial
*/
private Object attribs[];
/**
* Constructs a <code>SerialStruct</code> object from the given
* <code>Struct</code> object, using the given <code>java.util.Map</code>
* object for custom mapping the SQL structured type or any of its
* attributes that are SQL structured types.
*
* @param map a <code>java.util.Map</code> object in which
* each entry consists of 1) a <code>String</code> object
* giving the fully qualified name of a UDT and 2) the
* <code>Class</code> object for the <code>SQLData</code> implementation
* that defines how the UDT is to be mapped
* @throws SerialException if an error occurs
* @see java.sql.Struct
*/
public SerialStruct(Struct in, Map<String,Class<?>> map)
throws SerialException
{
try {
// get the type name
SQLTypeName = new String(in.getSQLTypeName());
System.out.println("SQLTypeName: " + SQLTypeName);
// get the attributes of the struct
attribs = in.getAttributes(map);
/*
* the array may contain further Structs
* and/or classes that have been mapped,
* other types that we have to serialize
*/
mapToSerial(map);
} catch (SQLException e) {
throw new SerialException(e.getMessage());
}
}
/**
* Constructs a <code>SerialStruct</code> object from the
* given <code>SQLData</code> object, using the given type
* map to custom map it to a class in the Java programming
* language. The type map gives the SQL type and the class
* to which it is mapped. The <code>SQLData</code> object
* defines the class to which the SQL type will be mapped.
*
* @param in an instance of the <code>SQLData</code> class
* that defines the mapping of the SQL structured
* type to one or more objects in the Java programming language
* @param map a <code>java.util.Map</code> object in which
* each entry consists of 1) a <code>String</code> object
* giving the fully qualified name of a UDT and 2) the
* <code>Class</code> object for the <code>SQLData</code> implementation
* that defines how the UDT is to be mapped
* @throws SerialException if an error occurs
*/
public SerialStruct(SQLData in, Map<String,Class<?>> map)
throws SerialException
{
try {
//set the type name
SQLTypeName = new String(in.getSQLTypeName());
Vector tmp = new Vector();
in.writeSQL(new SQLOutputImpl(tmp, map));
attribs = tmp.toArray();
} catch (SQLException e) {
throw new SerialException(e.getMessage());
}
}
/**
* Retrieves the SQL type name for this <code>SerialStruct</code>
* object. This is the name used in the SQL definition of the
* structured type
*
* @return a <code>String</code> object representing the SQL
* type name for the SQL structured type that this
* <code>SerialStruct</code> object represents
* @throws SerialException if an error occurs
*/
public String getSQLTypeName() throws SerialException {
return SQLTypeName;
}
/**
* Retrieves an array of <code>Object</code> values containing the
* attributes of the SQL structured type that this
* <code>SerialStruct</code> object represents.
*
* @return an array of <code>Object</code> values, with each
* element being an attribute of the SQL structured type
* that this <code>SerialStruct</code> object represents
* @throws SerialException if an error occurs
*/
public Object[] getAttributes() throws SerialException {
return attribs;
}
/**
* Retrieves the attributes for the SQL structured type that
* this <code>SerialStruct</code> represents as an array of
* <code>Object</code> values, using the given type map for
* custom mapping if appropriate.
*
* @param map a <code>java.util.Map</code> object in which
* each entry consists of 1) a <code>String</code> object
* giving the fully qualified name of a UDT and 2) the
* <code>Class</code> object for the <code>SQLData</code> implementation
* that defines how the UDT is to be mapped
* @return an array of <code>Object</code> values, with each
* element being an attribute of the SQL structured
* type that this <code>SerialStruct</code> object
* represents
* @throws SerialException if an error occurs
*/
public Object[] getAttributes(Map<String,Class<?>> map)
throws SerialException
{
return attribs;
}
/**
* Maps attributes of an SQL structured type that are not
* serialized to a serialized form, using the given type map
* for custom mapping when appropriate. The following types
* in the Java programming language are mapped to their
* serialized forms: <code>Struct</code>, <code>SQLData</code>,
* <code>Ref</code>, <code>Blob</code>, <code>Clob</code>, and
* <code>Array</code>.
* <P>
* This method is called internally and is not used by an
* application programmer.
*
* @param map a <code>java.util.Map</code> object in which
* each entry consists of 1) a <code>String</code> object
* giving the fully qualified name of a UDT and 2) the
* <code>Class</code> object for the <code>SQLData</code> implementation
* that defines how the UDT is to be mapped
* @throws SerialException if an error occurs
*/
private void mapToSerial(Map map) throws SerialException {
try {
for (int i = 0; i < attribs.length; i++) {
if (attribs[i] instanceof Struct) {
attribs[i] = new SerialStruct((Struct)attribs[i], map);
} else if (attribs[i] instanceof SQLData) {
attribs[i] = new SerialStruct((SQLData)attribs[i], map);
} else if (attribs[i] instanceof Blob) {
attribs[i] = new SerialBlob((Blob)attribs[i]);
} else if (attribs[i] instanceof Clob) {
attribs[i] = new SerialClob((Clob)attribs[i]);
} else if (attribs[i] instanceof Ref) {
attribs[i] = new SerialRef((Ref)attribs[i]);
} else if (attribs[i] instanceof java.sql.Array) {
attribs[i] = new SerialArray((java.sql.Array)attribs[i], map);
}
}
} catch (SQLException e) {
throw new SerialException(e.getMessage());
}
return;
}
/**
* The identifier that assists in the serialization of this
* <code>SerialStruct</code> object.
*/
static final long serialVersionUID = -8322445504027483372L;
}
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