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/* *************************************************************************
IT Mill Toolkit
Development of Browser User Interfaces Made Easy
Copyright (C) 2000-2006 IT Mill Ltd
*************************************************************************
This product is distributed under commercial license that can be found
from the product package on license.pdf. Use of this product might
require purchasing a commercial license from IT Mill Ltd. For guidelines
on usage, see licensing-guidelines.html
*************************************************************************
For more information, contact:
IT Mill Ltd phone: +358 2 4802 7180
Ruukinkatu 2-4 fax: +358 2 4802 7181
20540, Turku email: info@itmill.com
Finland company www: www.itmill.com
Primary source for information and releases: www.itmill.com
********************************************************************** */
package com.itmill.toolkit.data.util;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import com.itmill.toolkit.data.Container;
import com.itmill.toolkit.data.Item;
import com.itmill.toolkit.data.Property;
import com.itmill.toolkit.data.util.ObjectProperty;
/** SQL query container.
* Implementation of container interface for SQL tables accessed through
* JDBC connection.
*
* @author IT Mill Ltd.
* @version
* @VERSION@
* @since 4.0
*/
public class QueryContainer implements Container, Container.Ordered, Container.Indexed {
String queryStatement;
Connection connection;
ResultSet result;
Collection propertyIds;
HashMap propertyTypes = new HashMap();
int size = -1;
Statement statement;
/**
* Constructor for Query.
*/
public QueryContainer(String queryStatement, Connection connection)
throws SQLException {
this.connection = connection;
this.queryStatement = queryStatement;
refresh();
ResultSetMetaData metadata;
metadata = result.getMetaData();
int count = metadata.getColumnCount();
ArrayList list = new ArrayList(count);
for (int i = 1; i <= count; i++) {
String columnName = metadata.getColumnName(i);
list.add(columnName);
Property p = getContainerProperty(new Integer(1), columnName);
propertyTypes.put(columnName, p == null ? Object.class : p
.getType());
}
propertyIds = Collections.unmodifiableCollection(list);
}
public void refresh() throws SQLException {
close();
statement = connection.createStatement();
result = statement.executeQuery(queryStatement);
result.last();
size = result.getRow();
}
public void close() throws SQLException {
if (statement != null)
statement.close();
statement = null;
}
public Item getItem(Object id) {
return new Row(id);
}
public Collection getContainerPropertyIds() {
return propertyIds;
}
public Collection getItemIds() {
Collection c = new ArrayList(size);
for (int i = 1; i <= size; i++)
c.add(new Integer(i));
return c;
}
public synchronized Property getContainerProperty(Object itemId,
Object propertyId) {
if (!(itemId instanceof Integer && propertyId instanceof String))
return null;
Object value;
try {
result.absolute(((Integer) itemId).intValue());
value = result.getObject((String) propertyId);
} catch (Exception e) {
return null;
}
// Also deal with null values from the DB
return new ObjectProperty(value != null ? value : new String(""));
}
public Class getType(Object id) {
return (Class) propertyTypes.get(id);
}
public int size() {
return size;
}
public boolean containsId(Object id) {
if (!(id instanceof Integer))
return false;
int i = ((Integer) id).intValue();
if (i < 1)
return false;
if (i > size)
return false;
return true;
}
public Item addItem(Object arg0) throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public Object addItem() throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public boolean removeItem(Object arg0) throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public boolean addContainerProperty(Object arg0, Class arg1, Object arg2)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public boolean removeContainerProperty(Object arg0)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public boolean removeAllItems() throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public Item addItemAfter(Object arg0, Object arg1)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public Object addItemAfter(Object arg0)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public Object firstItemId() {
if (size < 1)
return null;
return new Integer(1);
}
public boolean isFirstId(Object id) {
return size > 0 && (id instanceof Integer)
&& ((Integer) id).intValue() == 1;
}
public boolean isLastId(Object id) {
return size > 0 && (id instanceof Integer)
&& ((Integer) id).intValue() == size;
}
public Object lastItemId() {
if (size < 1)
return null;
return new Integer(size);
}
public Object nextItemId(Object id) {
if (size < 1 || !(id instanceof Integer))
return null;
int i = ((Integer) id).intValue();
if (i >= size)
return null;
return new Integer(i + 1);
}
public Object prevItemId(Object id) {
if (size < 1 || !(id instanceof Integer))
return null;
int i = ((Integer) id).intValue();
if (i <= 1)
return null;
return new Integer(i - 1);
}
/** Query result row */
class Row implements Item {
Object id;
private Row(Object rowId) {
id = rowId;
}
public boolean addItemProperty(Object arg0, Property arg1)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public Property getItemProperty(Object propertyId) {
return getContainerProperty(id, propertyId);
}
public Collection getItemPropertyIds() {
return propertyIds;
}
public boolean removeItemProperty(Object arg0)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
}
public void finalize() {
try {
close();
} catch (SQLException ignored) {
}
}
public Item addItemAt(int arg0, Object arg1)
throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public Object addItemAt(int arg0) throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
public Object getIdByIndex(int index) {
if (size < 1 || index < 0 || index >= size)
return null;
return new Integer(index + 1);
}
public int indexOfId(Object id) {
if (size < 1 || !(id instanceof Integer))
return -1;
int i = ((Integer) id).intValue();
if (i >= size || i < 1)
return -1;
return i - 1;
}
}
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