Back to index...

	/*
	* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package javax.sql.rowset.serial;

	import java.sql.*;
	import javax.sql.*;
	import java.io.*;
	import java.math.*;
	import java.util.Arrays;
	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.
	*
	* <h3> Thread safety </h3>
	*
	* A SerialStruct is not safe for use by multiple concurrent threads. If a
	* SerialStruct is to be used by more than one thread then access to the
	* SerialStruct should be controlled by appropriate synchronization.
	*
	*/
	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 in an instance of {@code Struct}
	* @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 = 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 = in.getSQLTypeName();

	Vector<Object> 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 {
	Object[] val = this.attribs;
	return (val == null) ? null : Arrays.copyOf(val, val.length);
	}

	/**
	* 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
	{
	Object[] val = this.attribs;
	return (val == null) ? null : Arrays.copyOf(val, val.length);
	}


	/**
	* 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<String,Class<?>> 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;
	}

	/**
	* Compares this SerialStruct to the specified object. The result is
	* {@code true} if and only if the argument is not {@code null} and is a
	* {@code SerialStruct} object whose attributes are identical to this
	* object's attributes
	*
	* @param obj The object to compare this {@code SerialStruct} against
	*
	* @return {@code true} if the given object represents a {@code SerialStruct}
	* equivalent to this SerialStruct, {@code false} otherwise
	*
	*/
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	if (obj instanceof SerialStruct) {
	SerialStruct ss = (SerialStruct)obj;
	return SQLTypeName.equals(ss.SQLTypeName) &&
	Arrays.equals(attribs, ss.attribs);
	}
	return false;
	}

	/**
	* Returns a hash code for this {@code SerialStruct}. The hash code for a
	* {@code SerialStruct} object is computed using the hash codes
	* of the attributes of the {@code SerialStruct} object and its
	* {@code SQLTypeName}
	*
	* @return a hash code value for this object.
	*/
	public int hashCode() {
	return ((31 + Arrays.hashCode(attribs)) * 31) * 31
	+ SQLTypeName.hashCode();
	}

	/**
	* Returns a clone of this {@code SerialStruct}. The copy will contain a
	* reference to a clone of the underlying attribs array, not a reference
	* to the original underlying attribs array of this {@code SerialStruct} object.
	*
	* @return a clone of this SerialStruct
	*/
	public Object clone() {
	try {
	SerialStruct ss = (SerialStruct) super.clone();
	ss.attribs = Arrays.copyOf(attribs, attribs.length);
	return ss;
	} catch (CloneNotSupportedException ex) {
	// this shouldn't happen, since we are Cloneable
	throw new InternalError();
	}

	}

	/**
	* readObject is called to restore the state of the {@code SerialStruct} from
	* a stream.
	*/
	private void readObject(ObjectInputStream s)
	throws IOException, ClassNotFoundException {

	ObjectInputStream.GetField fields = s.readFields();
	Object[] tmp = (Object[])fields.get("attribs", null);
	attribs = tmp == null ? null : tmp.clone();
	SQLTypeName = (String)fields.get("SQLTypeName", null);
	}

	/**
	* writeObject is called to save the state of the {@code SerialStruct}
	* to a stream.
	*/
	private void writeObject(ObjectOutputStream s)
	throws IOException, ClassNotFoundException {

	ObjectOutputStream.PutField fields = s.putFields();
	fields.put("attribs", attribs);
	fields.put("SQLTypeName", SQLTypeName);
	s.writeFields();
	}

	/**
	* The identifier that assists in the serialization of this
	* <code>SerialStruct</code> object.
	*/
	static final long serialVersionUID = -8322445504027483372L;
	}

Back to index...