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The Open Source version of the IBM Toolbox for Java
///////////////////////////////////////////////////////////////////////////////
//
// JTOpen (IBM Toolbox for Java - OSS version)
//
// Filename: SQLQueryOrderPane.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 1997-2000 International Business Machines Corporation and
// others. All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////
package com.ibm.as400.vaccess;
import java.awt.BorderLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import javax.swing.Box;
import javax.swing.JComponent;
/**
The SQLQueryOrderPane class represents a panel which allows a
user to dynamically build the ORDER BY portion of an SQL query.
This panel is used for a page of the SQLQueryBuilderPane notebook.
**/
class SQLQueryOrderPane
extends JComponent
implements Serializable //@B0A - added it for consistency
{
private static final String copyright = "Copyright (C) 1997-2000 International Business Machines Corporation and others.";
// The variables and methods which have private commented out
// had to be made package scope since currently Internet Explorer
// does not allow inner class to access private items in their
// containing class.
// GUI components
private SQLQueryBuilderPane parent_;
private transient DoubleClickList selectItems_; //@B0C - made transient
/*private*/ DoubleClickList otherList_;
private SQLQueryClause clause_;
// Indicates if the selected items has changed.
/*private*/ boolean selectChanged_ = false;
// The fields that are selected
private String[] selectFields_;
// Listen to changes in the selected items.
protected SelectListener_ selectListener_ = null;
//@B0A: Has this table been init()-ed yet? (Used upon de-serialization)
private boolean inited_ = false; //@B0A
private static final String [] otherChoices = {"ASC", "DESC"};
/**
Constructs a SQLQueryOrderPane object.
init must be called to build the GUI contents.
@param parent The parent of this panel.
**/
public SQLQueryOrderPane (SQLQueryBuilderPane parent)
{
super();
parent_ = parent;
initializeTransient(); //@B0A
}
/**
Returns the sql clause for this panel.
@return The sql clause for this panel.
**/
public String getClause()
{
if (clause_ == null)
return null;
return clause_.getText();
}
/**
Build the panel GUI.
**/
public void init()
{
// Add listener to changes to selected items.
selectListener_ = new SelectListener_();
parent_.addSelectListener(selectListener_);
// Set up GUI.
setupPane();
inited_ = true; //@B0A - so we know what state we are in if deserialized
}
//@B0A
/**
Initializes the transient data.
**/
private void initializeTransient ()
{
addFocusListener(new SerializationListener(this)); // for safe serialization next time
if (inited_) init(); // preserve state of object upon deserialization
}
/**
Called when an item in the other list is double-clicked on.
The request is processed, and the completed item is added
to the clause.
@param item The item that was chosen.
**/
/*private*/ void otherPicked(String item)
{
// Add to clause
clause_.appendText(item);
otherList_.setEnabled(false);
}
//@B0A
/**
Restores the state of the object from an input stream.
This is used when deserializing an object.
@param in The input stream.
**/
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
initializeTransient();
}
/**
Adds the field to the clause.
@param index Index of the row in the table that was clicked upon.
**/
protected void rowPicked()
{
String item = (String)((Object[])selectItems_.getSelectedObjects())[0];
clause_.appendTextWithComma(item);
otherList_.setEnabled(true);
}
/**
Returns whether the item is a field name.
@return true if the item is a field name, false otherwise.
**/
private boolean isField(String item)
{
for (int i=0; i < selectFields_.length; ++i)
{
if (item.equals(selectFields_[i]))
return true;
}
return false;
}
/**
Builds the panel GUI components and sets up connections
between the components by using listeners.
**/
protected void setupPane()
{
// Select items.
selectFields_ = parent_.getSelectedFields();
selectItems_ = new DoubleClickList(parent_.getSelectedItems());
selectItems_.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
rowPicked();
}
});
// Other list.
otherList_ = new DoubleClickList(otherChoices);
otherList_.setVisibleRowCount(2);
otherList_.setEnabled(false);
otherList_.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
otherPicked((String)event.getItem());
}
});
// Arrange top row.
Box topRow = Box.createHorizontalBox();
topRow.add(new LabelledComponent("DBQUERY_COLUMN_SELECT", selectItems_));
topRow.add(new LabelledComponent("DBQUERY_LABEL_OTHER", otherList_));
// Query clause.
clause_ = new SQLQueryClause(5);
// Overall layout.
Box overallBox = Box.createVerticalBox();
overallBox.add(topRow);
overallBox.add(new LabelledComponent("DBQUERY_LABEL_CLAUSE_ORDER", new ScrollingTextPane(clause_)));
setLayout(new BorderLayout());
add("Center", overallBox);
}
/**
Update the selectItems_ if needed.
**/
public void update()
{
if (selectChanged_)
{
selectItems_.setListData(parent_.getSelectedItems());
// update the selected fields
selectFields_ = parent_.getSelectedFields();
selectChanged_ = false;
}
}
/**
Class to listen for property changes on the selected items.
**/
private class SelectListener_
implements PropertyChangeListener
{
public void propertyChange(PropertyChangeEvent event)
{
selectChanged_ = true;
}
}
}