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1. Spring MVC - Binding a Date Field
For request parameters representing string, number, and boolean values, the Spring MVC container can bind them to typed properties out of the box. How do you have the Spring MVC container bind a request parameter representing a Date? Speaking of which, how does the Spring MVC determine the type of a given request parameter? Thanks!
2. Set fields with instrospection - Problem with String.valueOf(String)
I'm setting public fields of the Object 'this' via reflection. Both the field name and the value are given as String. I use several various field types: Boolean, Integer, Float, Double, an own enum, and a String. It works with all of them except with a String. The exception that gets thrown is that no method with the Signature String.valueOf(String) exists... Now I use a dirty instanceof workar...
3. Grails request parameter type conversion
In my Grails app, I need to bind a request parameter to a Date field of a command object. In order to perform the String-to-Date conversion, one needs to register an appropriate PropertyEditor in grails-app\conf\spring\resources.groovy I've added the following bean definiton: import org.springframework.beans.propertyeditors.CustomDateEditor import java.text.SimpleDateFormat beans = { ...
4. Grails internals : Auto mapping and Domain object creation
I am trying to make a taglib to represent an object (to read and display at the UI). When creating an object (save method in the controller), I see the domain class and association are created by the auto assignment of parameter def Book = new Book(params) It also maps complex types (for eg: joda time). I wonder about the naming convention necessary to facilitate this mapping. Out of curio...
5. JSP custom tag attribute type integer
I want to create a custom tag library but in the handler class I would like to have integer attributes. In the tld file I have the following code: <tag> <name>circle</name> <tag-class>draw.Circle</tag-class> <body-content>jsp</body-content> <attribute> <name>x</name> <require...
6. How to cast string to integer at runtime
I am using reflection in java. I am getting to know the type of method parameter I am passing at run time. So I am fetching the parameter value from file into a string variable. SO now if i get to know that the parameter type as integer and if i pass an object containting the string value I am getting argument type mismatch java.lang.IllegalArgumentException: argument type mismatch Class... 
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  /*
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   * Copyright 1996-2003 Sun Microsystems, Inc.  All Rights Reserved.
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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   *
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   * This code is free software; you can redistribute it and/or modify it
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   * under the terms of the GNU General Public License version 2 only, as
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   * particular file as subject to the "Classpath" exception as provided
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   * by Sun in the LICENSE file that accompanied this code.
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  *
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  * accompanied this code).
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  */
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 package java.beans;

A PropertyEditor class provides support for GUIs that want to allow users to edit a property value of a given type.

PropertyEditor supports a variety of different kinds of ways of displaying and updating property values. Most PropertyEditors will only need to support a subset of the different options available in this API.

Simple PropertyEditors may only support the getAsText and setAsText methods and need not support (say) paintValue or getCustomEditor. More complex types may be unable to support getAsText and setAsText but will instead support paintValue and getCustomEditor.

Every propertyEditor must support one or more of the three simple display styles. Thus it can either (1) support isPaintable or (2) both return a non-null String[] from getTags() and return a non-null value from getAsText or (3) simply return a non-null String from getAsText().

Every property editor must support a call on setValue when the argument object is of the type for which this is the corresponding propertyEditor. In addition, each property editor must either support a custom editor, or support setAsText.

Each PropertyEditor should have a null constructor. 

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 public interface PropertyEditor {

    
Set (or change) the object that is to be edited. Primitive types such as "int" must be wrapped as the corresponding object type such as "java.lang.Integer".

Parameters:
value The new target object to be edited. Note that this object should not be modified by the PropertyEditor, rather the PropertyEditor should create a new object to hold any modified value.
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     void setValue(Object value);

    
Gets the property value.

Returns:
The value of the property. Primitive types such as "int" will be wrapped as the corresponding object type such as "java.lang.Integer".
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     Object getValue();
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     //----------------------------------------------------------------------
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Determines whether this property editor is paintable.

Returns:
True if the class will honor the paintValue method.
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     boolean isPaintable();

    
Paint a representation of the value into a given area of screen real estate. Note that the propertyEditor is responsible for doing its own clipping so that it fits into the given rectangle.

If the PropertyEditor doesn't honor paint requests (see isPaintable) this method should be a silent noop.

The given Graphics object will have the default font, color, etc of the parent container. The PropertyEditor may change graphics attributes such as font and color and doesn't need to restore the old values.

Parameters:
gfx Graphics object to paint into.
box Rectangle within graphics object into which we should paint.
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    void paintValue(java.awt.Graphics gfx, java.awt.Rectangle box);
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    //----------------------------------------------------------------------
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Returns a fragment of Java code that can be used to set a property to match the editors current state. This method is intended for use when generating Java code to reflect changes made through the property editor.

The code fragment should be context free and must be a legal Java expression as specified by the JLS.

Specifically, if the expression represents a computation then all classes and static members should be fully qualified. This rule applies to constructors, static methods and non primitive arguments.

Caution should be used when evaluating the expression as it may throw exceptions. In particular, code generators must ensure that generated code will compile in the presence of an expression that can throw checked exceptions.

Example results are:

  • Primitive expresssion: 2
  • Class constructor: new java.awt.Color(127,127,34)
  • Static field: java.awt.Color.orange
  • Static method: javax.swing.Box.createRigidArea(new java.awt.Dimension(0, 5))

Returns:
a fragment of Java code representing an initializer for the current value. It should not contain a semi-colon (';') to end the expression.
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    //----------------------------------------------------------------------
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Gets the property value as text.

Returns:
The property value as a human editable string.

Returns null if the value can't be expressed as an editable string.

If a non-null value is returned, then the PropertyEditor should be prepared to parse that string back in setAsText().

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    String getAsText();

    
Set the property value by parsing a given String. May raise java.lang.IllegalArgumentException if either the String is badly formatted or if this kind of property can't be expressed as text.

Parameters:
text The string to be parsed.
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    void setAsText(String text) throws java.lang.IllegalArgumentException;
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    //----------------------------------------------------------------------
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If the property value must be one of a set of known tagged values, then this method should return an array of the tags. This can be used to represent (for example) enum values. If a PropertyEditor supports tags, then it should support the use of setAsText with a tag value as a way of setting the value and the use of getAsText to identify the current value.

Returns:
The tag values for this property. May be null if this property cannot be represented as a tagged value.
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    String[] getTags();
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    //----------------------------------------------------------------------
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A PropertyEditor may choose to make available a full custom Component that edits its property value. It is the responsibility of the PropertyEditor to hook itself up to its editor Component itself and to report property value changes by firing a PropertyChange event.

The higher-level code that calls getCustomEditor may either embed the Component in some larger property sheet, or it may put it in its own individual dialog, or ...

Returns:
A java.awt.Component that will allow a human to directly edit the current property value. May be null if this is not supported.
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    java.awt.Component getCustomEditor();

    
Determines whether this property editor supports a custom editor.

Returns:
True if the propertyEditor can provide a custom editor.
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    boolean supportsCustomEditor();
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    //----------------------------------------------------------------------
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Register a listener for the PropertyChange event. When a PropertyEditor changes its value it should fire a PropertyChange event on all registered PropertyChangeListeners, specifying the null value for the property name and itself as the source.

Parameters:
listener An object to be invoked when a PropertyChange event is fired.
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    void addPropertyChangeListener(PropertyChangeListener listener);

    
Remove a listener for the PropertyChange event.

Parameters:
listener The PropertyChange listener to be removed.
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