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/* Copyright (c) 2001-2021, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
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*
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package org.hsqldb.jdbc;
import java.sql.Array;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.hsqldb.ColumnBase;
import org.hsqldb.SessionInterface;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.navigator.RowSetNavigatorClient;
import org.hsqldb.result.Result;
import org.hsqldb.result.ResultMetaData;
import org.hsqldb.types.Type;
/**
* The mapping in the Java programming language for the SQL type
* ARRAY.
* By default, an Array value is a transaction-duration
* reference to an SQL ARRAY value. By default, an Array
* object is implemented using an SQL LOCATOR(array) internally, which
* means that an Array object contains a logical pointer
* to the data in the SQL ARRAY value rather
* than containing the ARRAY value's data.
*
* The Array interface provides methods for bringing an SQL
* ARRAY value's data to the client as either an array or a
* ResultSet object.
* If the elements of the SQL ARRAY
* are a UDT, they may be custom mapped. To create a custom mapping,
* a programmer must do two things:
*
* - create a class that implements the {@link java.sql.SQLData}
* interface for the UDT to be custom mapped.
*
- make an entry in a type map that contains
*
* - the fully-qualified SQL type name of the UDT
*
- the
Class object for the class implementing
* SQLData
*
*
*
* When a type map with an entry for
* the base type is supplied to the methods getArray
* and getResultSet, the mapping
* it contains will be used to map the elements of the ARRAY value.
* If no type map is supplied, which would typically be the case,
* the connection's type map is used by default.
* If the connection's type map or a type map supplied to a method has no entry
* for the base type, the elements are mapped according to the standard mapping.
*
* All methods on the Array interface must be fully implemented if the
* JDBC driver supports the data type.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.1
* @since JDK 1.2, HSQLDB 2.0
*/
public class JDBCArray implements Array {
/**
* Retrieves the SQL type name of the elements in
* the array designated by this Array object.
* If the elements are a built-in type, it returns
* the database-specific type name of the elements.
* If the elements are a user-defined type (UDT),
* this method returns the fully-qualified SQL type name.
*
* @return a String that is the database-specific
* name for a built-in base type; or the fully-qualified SQL type
* name for a base type that is a UDT
* @exception SQLException if an error occurs while attempting
* to access the type name
* @since JDK 1.2
*/
public String getBaseTypeName() throws SQLException {
checkClosed();
return elementType.getNameString();
}
/**
* Retrieves the JDBC type of the elements in the array designated
* by this Array object.
*
* @return a constant from the class {@link java.sql.Types} that is
* the type code for the elements in the array designated by this
* Array object
* @exception SQLException if an error occurs while attempting
* to access the base type
* @since JDK 1.2
*/
public int getBaseType() throws SQLException {
checkClosed();
return elementType.getJDBCTypeCode();
}
/**
*
* Retrieves the contents of the SQL ARRAY value designated
* by this
* Array object in the form of an array in the Java
* programming language. This version of the method getArray
* uses the type map associated with the connection for customizations of
* the type mappings.
*
* Note: When getArray is used to materialize
* a base type that maps to a primitive data type, then it is
* implementation-defined whether the array returned is an array of
* that primitive data type or an array of Object.
*
*
*
*
* HSQLDB-Specific Information:
*
* HSQLDB always returns an array of Object.
*
*
*
*
* @return an array in the Java programming language that contains
* the ordered elements of the SQL ARRAY value
* designated by this Array object
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public Object getArray() throws SQLException {
checkClosed();
Object[] array = new Object[data.length];
for (int i = 0; i < data.length; i++) {
array[i] = elementType.convertSQLToJava(sessionProxy, data[i]);
}
return array;
}
/**
*
* Retrieves the contents of the SQL ARRAY value designated by this
* Array 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 in map, in which case it
* uses the standard mapping. This version of the method
* getArray uses either the given type map or the standard mapping;
* it never uses the type map associated with the connection.
*
* Note: When getArray is used to materialize
* a base type that maps to a primitive data type, then it is
* implementation-defined whether the array returned is an array of
* that primitive data type or an array of Object.
*
*
*
*
* HSQLDB-Specific Information:
*
* HSQLDB always returns an array of Object.
*
*
*
*
* @param map a java.util.Map object that contains mappings
* of SQL type names to classes in the Java programming language
* @return an array in the Java programming language that contains the ordered
* elements of the SQL array designated by this object
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public Object getArray(java.util.Map> map) throws SQLException {
return getArray();
}
/**
*
* Retrieves a slice of the SQL ARRAY
* value designated by this Array object, beginning with the
* specified index and containing up to count
* successive elements of the SQL array. This method uses the type map
* associated with the connection for customizations of the type mappings.
*
* Note: When getArray is used to materialize
* a base type that maps to a primitive data type, then it is
* implementation-defined whether the array returned is an array of
* that primitive data type or an array of Object.
*
*
*
*
* HSQLDB-Specific Information:
*
* HSQLDB always returns an array of Object.
*
*
*
*
* @param index the array index of the first element to retrieve;
* the first element is at index 1
* @param count the number of successive SQL array elements to retrieve
* @return an array containing up to count consecutive elements
* of the SQL array, beginning with element index
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public Object getArray(long index, int count) throws SQLException {
checkClosed();
if (!JDBCClobClient.isInLimits(data.length, index - 1, count)) {
throw JDBCUtil.outOfRangeArgument();
}
Object[] slice = new Object[count];
for (int i = 0; i < count; i++) {
slice[i] = elementType.convertSQLToJava(sessionProxy,
data[(int) index + i - 1]);
}
return slice;
}
/**
*
* Retrieves a slice of the SQL ARRAY value
* designated by this Array object, beginning with the specified
* index and containing up to count
* successive elements of the SQL array.
*
* This method uses
* the specified map for type map customizations
* unless the base type of the array does not match a user-defined
* type in map, in which case it
* uses the standard mapping. This version of the method
* getArray uses either the given type map or the standard mapping;
* it never uses the type map associated with the connection.
*
* Note: When getArray is used to materialize
* a base type that maps to a primitive data type, then it is
* implementation-defined whether the array returned is an array of
* that primitive data type or an array of Object.
*
*
*
*
* HSQLDB-Specific Information:
*
* HSQLDB always returns an array of Object.
*
*
*
*
* @param index the array index of the first element to retrieve;
* the first element is at index 1
* @param count the number of successive SQL array elements to
* retrieve
* @param map a java.util.Map object
* that contains SQL type names and the classes in
* the Java programming language to which they are mapped
* @return an array containing up to count
* consecutive elements of the SQL ARRAY value designated by this
* Array object, beginning with element
* index
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public Object getArray(long index, int count,
java.util.Map> map) throws SQLException {
return getArray(index, count);
}
/**
* Retrieves a result set that contains the elements of the SQL
* ARRAY value
* designated by this Array object. If appropriate,
* the elements of the array are mapped using the connection's type
* map; otherwise, the standard mapping is used.
*
* The result set contains one row for each array element, with
* two columns in each row. The second column stores the element
* value; the first column stores the index into the array for
* that element (with the first array element being at index 1).
* The rows are in ascending order corresponding to
* the order of the indices.
*
* @return a {@link ResultSet} object containing one row for each
* of the elements in the array designated by this Array
* object, with the rows in ascending order based on the indices.
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public ResultSet getResultSet() throws SQLException {
checkClosed();
Result result = this.newColumnResult(0, data.length);
return new JDBCResultSet(connection, result, result.metaData);
}
/**
* Retrieves a result set that contains the elements of the SQL
* ARRAY value designated by this Array 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 in map, in which case it
* uses the standard mapping. This version of the method
* getResultSet uses either the given type map or the standard mapping;
* it never uses the type map associated with the connection.
*
* The result set contains one row for each array element, with
* two columns in each row. The second column stores the element
* value; the first column stores the index into the array for
* that element (with the first array element being at index 1).
* The rows are in ascending order corresponding to
* the order of the indices.
*
* @param map contains the mapping of SQL user-defined types to
* classes in the Java programming language
* @return a ResultSet object containing one row for each
* of the elements in the array designated by this Array
* object, with the rows in ascending order based on the indices.
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public ResultSet getResultSet(java.util.Map> map) throws SQLException {
return getResultSet();
}
/**
* Retrieves a result set holding the elements of the subarray that
* starts at index index and contains up to
* count 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.
*
* The result set has one row for each element of the SQL array
* designated by this object, with the first row containing the
* element at index index. The result set has
* up to count rows in ascending order based on the
* indices. Each row has two columns: The second column stores
* the element value; the first column stores the index into the
* array for that element.
*
* @param index the array index of the first element to retrieve;
* the first element is at index 1
* @param count the number of successive SQL array elements to retrieve
* @return a ResultSet object containing up to
* count consecutive elements of the SQL array
* designated by this Array object, starting at
* index index.
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public ResultSet getResultSet(long index, int count) throws SQLException {
checkClosed();
Result result = this.newColumnResult(index - 1, count);
return new JDBCResultSet(connection, result, result.metaData);
}
/**
* Retrieves a result set holding the elements of the subarray that
* starts at index index and contains up to
* count 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 in map, in which case it
* uses the standard mapping. This version of the method
* getResultSet uses either the given type map or the standard mapping;
* it never uses the type map associated with the connection.
*
* The result set has one row for each element of the SQL array
* designated by this object, with the first row containing the
* element at index index. The result set has
* up to count rows in ascending order based on the
* indices. Each row has two columns: The second column stores
* the element value; the first column stores the index into the
* array for that element.
*
* @param index the array index of the first element to retrieve;
* the first element is at index 1
* @param count the number of successive SQL array elements to retrieve
* @param map the Map object that contains the mapping
* of SQL type names to classes in the Java(tm) programming language
* @return a ResultSet object containing up to
* count consecutive elements of the SQL array
* designated by this Array object, starting at
* index index.
* @exception SQLException if an error occurs while attempting to
* access the array
* @since JDK 1.2
*/
public ResultSet getResultSet(long index, int count,
java.util.Map> map) throws SQLException {
return getResultSet(index, count);
}
/**
* Returns a string representation in the form ARRAY[..., ...]
*/
public String toString() {
if (arrayType == null) {
arrayType = Type.getDefaultArrayType(elementType.typeCode);
}
return arrayType.convertToString(data);
}
/**
* This method frees the Array object and releases the resources that
* it holds. The object is invalid once the free
* method is called.
*
* After free has been called, any attempt to invoke a
* method other than free will result in a SQLException
* being thrown. If free is called multiple times, the subsequent
* calls to free are treated as a no-op.
*
*
* @throws SQLException if an error occurs releasing
* the Array's resources
* @since JDK 1.6
*/
public void free() throws SQLException {
if (!closed) {
closed = true;
connection = null;
sessionProxy = null;
}
}
//-------------
volatile boolean closed;
Type arrayType;
Type elementType;
Object[] data;
JDBCConnection connection;
SessionInterface sessionProxy;
public JDBCArray(Object[] data, Type type, Type arrayType,
SessionInterface session) {
this(data, type, arrayType, session.getJDBCConnection());
this.sessionProxy = session;
}
/**
* Constructor should reject unsupported types.
*/
JDBCArray(Object[] data, Type type, Type arrayType,
JDBCConnection connection) {
this.data = data;
this.elementType = type;
this.arrayType = arrayType;
this.connection = connection;
if (connection != null) {
this.sessionProxy = connection.sessionProxy;
}
}
public Object[] getArrayInternal() {
return data;
}
private Result newColumnResult(long position,
int count) throws SQLException {
if (!JDBCClobClient.isInLimits(data.length, position, count)) {
throw JDBCUtil.outOfRangeArgument();
}
Type[] types = new Type[2];
types[0] = Type.SQL_INTEGER;
types[1] = elementType;
ResultMetaData meta = ResultMetaData.newSimpleResultMetaData(types);
meta.columnLabels = new String[] {
"C1", "C2"
};
meta.colIndexes = new int[] {
-1, -1
};
meta.columns = new ColumnBase[2];
ColumnBase column = new ColumnBase("", "", "", "");
column.setType(types[0]);
meta.columns[0] = column;
column = new ColumnBase("", "", "", "");
column.setType(types[1]);
meta.columns[1] = column;
RowSetNavigatorClient navigator = new RowSetNavigatorClient();
for (int i = (int) position; i < position + count; i++) {
Object[] rowData = new Object[2];
rowData[0] = Integer.valueOf(i + 1);
rowData[1] = data[i];
navigator.add(rowData);
}
Result result = Result.newDataResult(meta);
result.setNavigator(navigator);
return result;
}
private void checkClosed() throws SQLException {
if (closed) {
throw JDBCUtil.sqlException(ErrorCode.X_07501);
}
}
}