/*
* @(#)SerialArray.java 1.9 04/05/29
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.sql.rowset.serial;
import java.sql.*;
import java.io.*;
import java.util.Map;
import java.net.URL;
/**
* A serialized version of an <code>Array</code>
* object, which is the mapping in the Java programming language of an SQL
* <code>ARRAY</code> value.
* <P>
* The <code>SerialArray</code> class provides a constructor for creating
* a <code>SerialArray</code> instance from an <code>Array</code> object,
* methods for getting the base type and the SQL name for the base type, and
* methods for copying all or part of a <code>SerialArray</code> object.
* <P>
* Note: In order for this class to function correctly, a connection to the
* data source
* must be available in order for the SQL <code>Array</code> object to be
* materialized (have all of its elements brought to the client server)
* if necessary. At this time, logical pointers to the data in the data source,
* such as locators, are not currently supported.
*/
public class SerialArray implements Array, Serializable, Cloneable {
/**
* A serialized array in which each element is an <code>Object</code>
* in the Java programming language that represents an element
* in the SQL <code>ARRAY</code> value.
* @serial
*/
private Object[] elements;
/**
* The SQL type of the elements in this <code>SerialArray</code> object. The
* type is expressed as one of the constants from the class
* <code>java.sql.Types</code>.
* @serial
*/
private int baseType;
/**
* The type name used by the DBMS for the elements in the SQL <code>ARRAY</code>
* value that this <code>SerialArray</code> object represents.
* @serial
*/
private String baseTypeName;
/**
* The number of elements in this <code>SerialArray</code> object, which
* is also the number of elements in the SQL <code>ARRAY</code> value
* that this <code>SerialArray</code> object represents.
* @serial
*/
private int len;
/**
* Constructs a new <code>SerialArray</code> object from the given
* <code>Array</code> object, using the given type map for the custom
* mapping of each element when the elements are SQL UDTs.
* <P>
* This method does custom mapping if the array elements are a UDT
* and the given type map has an entry for that UDT.
* Custom mapping is recursive,
* meaning that if, for instance, an element of an SQL structured type
* is an SQL structured type that itself has an element that is an SQL
* structured type, each structured type that has a custom mapping will be
* mapped according to the given type map.
* <P>
* The new <code>SerialArray</code>
* object contains the same elements as the <code>Array</code> object
* from which it is built, except when the base type is the SQL type
* <code>STRUCT</code>, <code>ARRAY</code>, <code>BLOB</code>,
* <code>CLOB</code>, <code>DATALINK</code> or <code>JAVA_OBJECT</code>.
* In this case, each element in the new
* <code>SerialArray</code> object is the appropriate serialized form,
* that is, a <code>SerialStruct</code>, <code>SerialArray</code>,
* <code>SerialBlob</code>, <code>SerialClob</code>,
* <code>SerialDatalink</code>, or <code>SerialJavaObject</code> object.
* <P>
* Note: (1) The <code>Array</code> object from which a <code>SerialArray</code>
* object is created must have materialized the SQL <code>ARRAY</code> value's
* data on the client before it is passed to the constructor. Otherwise,
* the new <code>SerialArray</code> object will contain no data.
* <p>
* Note: (2) If the <code>Array</code> contains <code>java.sql.Types.JAVA_OBJECT</code>
* types, the <code>SerialJavaObject</code> constructor is called where checks
* are made to ensure this object is serializable.
* <p>
* Note: (3) The <code>Array</code> object supplied to this constructor cannot
* return <code>null</code> for any <code>Array.getArray()</code> methods.
* <code>SerialArray</code> cannot serialize null array values.
*
*
* @param array the <code>Array</code> object to be serialized
* @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 (an SQL structured type or
* distinct type) and 2) the
* <code>Class</code> object for the <code>SQLData</code> implementation
* that defines how the UDT is to be mapped. The <i>map</i>
* parameter does not have any effect for <code>Blob</code>,
* <code>Clob</code>, <code>DATALINK</code>, or
* <code>JAVA_OBJECT</code> types.
* @throws SerialException if an error occurs serializing the
* <code>Array</code> object
* @throws SQLException if a database access error occurs or if the
* <i>array</i> or the <i>map</i> values are <code>null</code>
*/
public SerialArray(Array array, Map<String,Class<?>> map)
throws SerialException, SQLException
{
if ((array == null) || (map == null)) {
throw new SQLException("Cannot instantiate a SerialArray " +
"object with null parameters");
}
if ((elements = (Object[])array.getArray()) == null) {
throw new SQLException("Invalid Array object. Calls to Array.getArray() " +
"return null value which cannot be serialized");
}
elements = (Object[])array.getArray(map);
baseType = array.getBaseType();
baseTypeName = array.getBaseTypeName();
len = elements.length;
switch (baseType) {
case java.sql.Types.STRUCT:
for (int i = 0; i < len; i++) {
elements[i] = new SerialStruct((Struct)elements[i], map);
}
break;
case java.sql.Types.ARRAY:
for (int i = 0; i < len; i++) {
elements[i] = new SerialArray((Array)elements[i], map);
}
break;
case java.sql.Types.BLOB:
for (int i = 0; i < len; i++) {
elements[i] = new SerialBlob((Blob)elements[i]);
}
break;
case java.sql.Types.CLOB:
for (int i = 0; i < len; i++) {
elements[i] = new SerialClob((Clob)elements[i]);
}
break;
case java.sql.Types.DATALINK:
for (int i = 0; i < len; i++) {
elements[i] = new SerialDatalink((URL)elements[i]);
}
break;
case java.sql.Types.JAVA_OBJECT:
for (int i = 0; i < len; i++) {
elements[i] = new SerialJavaObject((Object)elements[i]);
}
default:
;
}
}
/**
* This method frees the <code>Array</code> object and releases the resources that
* it holds. The object is invalid once the <code>free</code>
* method is called.
*<p>
* After <code>free</code> has been called, any attempt to invoke a
* method other than <code>free</code> will result in a <code>SQLException</code>
* being thrown. If <code>free</code> is called multiple times, the subsequent
* calls to <code>free</code> are treated as a no-op.
*<p>
*
* @throws SQLException if an error occurs releasing
* the Array's resources
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @since 1.6
*/
public void free() throws SQLException {
throw new SQLFeatureNotSupportedException("Feature not supported");
}
/**
* Constructs a new <code>SerialArray</code> object from the given
* <code>Array</code> object.
* <P>
* This constructor does not do custom mapping. If the base type of the array
* is an SQL structured type and custom mapping is desired, the constructor
* <code>SerialArray(Array array, Map map)</code> should be used.
* <P>
* The new <code>SerialArray</code>
* object contains the same elements as the <code>Array</code> object
* from which it is built, except when the base type is the SQL type
* <code>BLOB</code>,
* <code>CLOB</code>, <code>DATALINK</code> or <code>JAVA_OBJECT</code>.
* In this case, each element in the new
* <code>SerialArray</code> object is the appropriate serialized form,
* that is, a <code>SerialBlob</code>, <code>SerialClob</code>,
* <code>SerialDatalink</code>, or <code>SerialJavaObject</code> object.
* <P>
* Note: (1) The <code>Array</code> object from which a <code>SerialArray</code>
* object is created must have materialized the SQL <code>ARRAY</code> value's
* data on the client before it is passed to the constructor. Otherwise,
* the new <code>SerialArray</code> object will contain no data.
* <p>
* Note: (2) The <code>Array</code> object supplied to this constructor cannot
* return <code>null</code> for any <code>Array.getArray()</code> methods.
* <code>SerialArray</code> cannot serialize <code>null</code> array values.
*
* @param array the <code>Array</code> object to be serialized
* @throws SerialException if an error occurs serializing the
* <code>Array</code> object
* @throws SQLException if a database access error occurs or the
* <i>array</i> parameter is <code>null</code>.
*/
public SerialArray(Array array) throws SerialException, SQLException {
if (array == null) {
throw new SQLException("Cannot instantiate a SerialArray " +
"object with a null Array object");
}
if ((elements = (Object[])array.getArray()) == null) {
throw new SQLException("Invalid Array object. Calls to Array.getArray() " +
"return null value which cannot be serialized");
}
//elements = (Object[])array.getArray();
baseType = array.getBaseType();
baseTypeName = array.getBaseTypeName();
len = elements.length;
switch (baseType) {
case java.sql.Types.BLOB:
for (int i = 0; i < len; i++) {
elements[i] = new SerialBlob((Blob)elements[i]);
}
break;
case java.sql.Types.CLOB:
for (int i = 0; i < len; i++) {
elements[i] = new SerialClob((Clob)elements[i]);
}
break;
case java.sql.Types.DATALINK:
for (int i = 0; i < len; i++) {
elements[i] = new SerialDatalink((URL)elements[i]);
}
break;
case java.sql.Types.JAVA_OBJECT:
for (int i = 0; i < len; i++) {
elements[i] = new SerialJavaObject((Object)elements[i]);
}
default:
;
}
}
/**
* Returns a new array that is a copy of this <code>SerialArray</code>
* object.
*
* @return a copy of this <code>SerialArray</code> object as an
* <code>Object</code> in the Java programming language
* @throws SerialException if an error occurs retrieving a copy of
* this <code>SerialArray</code> object
*/
public Object getArray() throws SerialException {
Object dst = new Object[len];
System.arraycopy((Object)elements, 0, dst, 0, len);
return dst;
}
//[if an error occurstype map used??]
/**
* Returns a new array that is a copy of this <code>SerialArray</code>
* object, using the given type map for the custom
* mapping of each element when the elements are SQL UDTs.
* <P>
* This method does custom mapping if the array elements are a UDT
* and the given type map has an entry for that UDT.
* Custom mapping is recursive,
* meaning that if, for instance, an element of an SQL structured type
* is an SQL structured type that itself has an element that is an SQL
* structured type, each structured type that has a custom mapping will be
* mapped according to the given type map.
*
* @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 a copy of this <code>SerialArray</code> object as an
* <code>Object</code> in the Java programming language
* @throws SerialException if an error occurs
*/
public Object getArray(Map<String, Class<?>> map) throws SerialException {
Object dst[] = new Object[len];
System.arraycopy((Object)elements, 0, dst, 0, len);
return dst;
}
/**
* Returns a new array that is a copy of a slice
* of this <code>SerialArray</code> object, starting with the
* element at the given index and containing the given number
* of consecutive elements.
*
* @param index the index into this <code>SerialArray</code> object
* of the first element to be copied;
* the index of the first element is <code>0</code>
* @param count the number of consecutive elements to be copied, starting
* at the given index
* @return a copy of the designated elements in this <code>SerialArray</code>
* object as an <code>Object</code> in the Java programming language
* @throws SerialException if an error occurs
*/
public Object getArray(long index, int count) throws SerialException {
Object dst = new Object[count];
System.arraycopy((Object)elements, (int)index, dst, 0, count);
return dst;
}
/**
* Returns a new array that is a copy of a slice
* of this <code>SerialArray</code> object, starting with the
* element at the given index and containing the given number
* of consecutive elements.
* <P>
* This method does custom mapping if the array elements are a UDT
* and the given type map has an entry for that UDT.
* Custom mapping is recursive,
* meaning that if, for instance, an element of an SQL structured type
* is an SQL structured type that itself has an element that is an SQL
* structured type, each structured type that has a custom mapping will be
* mapped according to the given type map.
*
* @param index the index into this <code>SerialArray</code> object
* of the first element to be copied; the index of the
* first element in the array is <code>0</code>
* @param count the number of consecutive elements to be copied, starting
* at the given index
* @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 a copy of the designated elements in this <code>SerialArray</code>
* object as an <code>Object</code> in the Java programming language
* @throws SerialException if an error occurs
*/
public Object getArray(long index, int count, Map<String,Class<?>> map)
throws SerialException
{
Object dst = new Object[count];
System.arraycopy((Object)elements, (int)index, dst, 0, count);
return dst;
}
/**
* Retrieves the SQL type of the elements in this <code>SerialArray</code>
* object. The <code>int</code> returned is one of the constants in the class
* <code>java.sql.Types</code>.
*
* @return one of the constants in <code>java.sql.Types</code>, indicating
* the SQL type of the elements in this <code>SerialArray</code> object
* @throws SerialException if an error occurs
*/
public int getBaseType() throws SerialException {
return baseType;
}
/**
* Retrieves the DBMS-specific type name for the elements in this
* <code>SerialArray</code> object.
*
* @return the SQL type name used by the DBMS for the base type of this
* <code>SerialArray</code> object
* @throws SerialException if an error occurs
*/
public String getBaseTypeName() throws SerialException {
return baseTypeName;
}
/**
* Retrieves a <code>ResultSet</code> object holding the elements of
* the subarray that starts at
* index <i>index</i> and contains up to <i>count</i> successive elements.
* This method uses the connection's type map to map the elements of
* the array if the map contains
* an entry for the base type. Otherwise, the standard mapping is used.
*
* @param index the index into this <code>SerialArray</code> object
* of the first element to be copied; the index of the
* first element in the array is <code>0</code>
* @param count the number of consecutive elements to be copied, starting
* at the given index
* @return a <code>ResultSet</code> object containing the designated
* elements in this <code>SerialArray</code> object, with a
* separate row for each element
* @throws SerialException, which in turn throws an
* <code>UnsupportedOperationException</code>, if this method is called
*/
public ResultSet getResultSet(long index, int count) throws SerialException {
throw new UnsupportedOperationException();
}
/**
*
* Retrieves a <code>ResultSet</code> object that contains all of
* the elements of the SQL <code>ARRAY</code>
* value represented by this <code>SerialArray</code> object. This method uses
* the specified map for type map customizations unless the base type of the
* array does not match a user-defined type (UDT) in <i>map</i>, in
* which case it uses the
* standard mapping. This version of the method <code>getResultSet</code>
* uses either the given type map or the standard mapping; it never uses the
* type map associated with the connection.
*
* @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 a <code>ResultSet</code> object containing all of the
* elements in this <code>SerialArray</code> object, with a
* separate row for each element
* @throws SerialException, which in turn throws an
* <code>UnsupportedOperationException</code>, if this method is called
*/
public ResultSet getResultSet(Map<String, Class<?>> map)
throws SerialException
{
throw new UnsupportedOperationException();
}
/**
* Retrieves a <code>ResultSet</code> object that contains all of
* the elements in the <code>ARRAY</code> value that this
* <code>SerialArray</code> object represents.
* If appropriate, the elements of the array are mapped using the connection's
* type map; otherwise, the standard mapping is used.
*
* @return a <code>ResultSet</code> object containing all of the
* elements in this <code>SerialArray</code> object, with a
* separate row for each element
* @throws SerialException if called, which in turn throws an
* <code>UnsupportedOperationException</code>, if this method is called
*/
public ResultSet getResultSet() throws SerialException {
throw new UnsupportedOperationException();
}
/**
* Retrieves a result set holding the elements of the subarray that starts at
* Retrieves a <code>ResultSet</code> object that contains a subarray of the
* elements in this <code>SerialArray</code> object, starting at
* index <i>index</i> and containing up to <i>count</i> successive
* elements. This method uses
* the specified map for type map customizations unless the base type of the
* array does not match a user-defined type (UDT) in <i>map</i>, in
* which case it uses the
* standard mapping. This version of the method <code>getResultSet</code> uses
* either the given type map or the standard mapping; it never uses the type
* map associated with the connection.
*
* @param index the index into this <code>SerialArray</code> object
* of the first element to be copied; the index of the
* first element in the array is <code>0</code>
* @param count the number of consecutive elements to be copied, starting
* at the given index
* @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 a <code>ResultSet</code> object containing the designated
* elements in this <code>SerialArray</code> object, with a
* separate row for each element
* @throws SerialException if called, which in turn throws an
* <code>UnsupportedOperationException</code>
*/
public ResultSet getResultSet(long index, int count,
Map<String,Class<?>> map)
throws SerialException
{
throw new UnsupportedOperationException();
}
/**
* The identifier that assists in the serialization of this <code>SerialArray</code>
* object.
*/
static final long serialVersionUID = -8466174297270688520L;
}
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