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/*
* Copyright (c) 2002-2013 JGoodies Software GmbH. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Software GmbH nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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*/
package com.jgoodies.binding.value;
import static com.jgoodies.common.base.Preconditions.checkNotNull;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.lang.ref.WeakReference;
import com.jgoodies.common.bean.Bean;
/**
* An abstract wrapper for ValueModels that provides ComponentModel features.
*
* @author Karsten Lentzsch
* @version $Revision: 1.15 $
*
* @since 2.4
*/
public abstract class AbstractWrappedValueModel extends AbstractValueModel
implements ComponentValueModel {
// Instance Fields ********************************************************
/**
* Holds the wrapped ValueModel that is used to read and write value.
*/
private final ValueModel wrappee;
/**
* Provides the component properties: enabled, visible, editable.
* Is either the wrapped ValueModel or a simple bean.
*/
private final ComponentModel componentPropertyProvider;
private final PropertyChangeListener valueChangeHandler;
private final PropertyChangeListener componentPropertyChangeHandler;
// Instance Creation ******************************************************
/**
* Constructs a DefaultComponentValueModel that wraps the given ValueModel
* and adds {@link ComponentModel} Properties.
*
* @param wrappee the underlying or wrapped ValueModel
*/
public AbstractWrappedValueModel(ValueModel wrappee) {
this.wrappee = checkNotNull(wrappee, "The wrapped model must not be null.");
this.componentPropertyProvider = wrappee instanceof ComponentModel
? (ComponentModel) wrappee
: new SimpleComponentModel();
this.valueChangeHandler = createValueChangeHandler();
this.componentPropertyChangeHandler = new ComponentPropertyChangeHandler();
wrappee.addValueChangeListener(valueChangeHandler);
componentPropertyProvider.addPropertyChangeListener(componentPropertyChangeHandler);
}
// ComponentModel Implementation ******************************************
/**
* Returns if this model represents an enabled or disabled component state.
*
* @return true for enabled, false for disabled
*/
@Override
public boolean isEnabled() {
return componentPropertyProvider.isEnabled();
}
/**
* Enables or disabled this model, which in turn
* will enable or disable all Swing components bound to this model.
*
* @param b true to enable, false to disable.
*/
@Override
public void setEnabled(boolean b) {
componentPropertyProvider.setEnabled(b);
}
/**
* Returns if this model represents the visible or invisible component state.
*
* @return true for visible, false for invisible
*/
@Override
public boolean isVisible() {
return componentPropertyProvider.isVisible();
}
/**
* Sets this model state to visible or invisible, which in turn
* will make all Swing components bound to this model visible or invisible.
*
* @param b true for visible, false for invisible
*/
@Override
public void setVisible(boolean b) {
componentPropertyProvider.setVisible(b);
}
/**
* Returns if this model represents the editable or non-editable
* text component state.
*
* @return true for editable, false for non-editable
*/
@Override
public boolean isEditable() {
return componentPropertyProvider.isEditable();
}
/**
* Sets this model state to editable or non-editable, which in turn will
* make all text components bound to this model editable or non-editable.
*
* @param b true for editable, false for non-editable
*/
@Override
public void setEditable(boolean b) {
componentPropertyProvider.setEditable(b);
}
// Misc *******************************************************************
/**
* Removes the internal change handlers from the wrapped value model.
* The listener has been registered during construction. Useful to avoid
* memory leaks, if the wrappee lives much longer than this wrapper.
* As an alternative you can use event listener lists in your ValueModels
* that implement references with {@link WeakReference}.
*
* This model must not be used anymore once #release has been called.
*
* Subclasses that override this method must call this super implementation.
*/
public void release() {
wrappee.removeValueChangeListener(valueChangeHandler);
componentPropertyProvider.removePropertyChangeListener(componentPropertyChangeHandler);
}
// Abstract Behavior ******************************************************
protected abstract PropertyChangeListener createValueChangeHandler();
// Default Access *********************************************************
protected final ValueModel getWrappee() {
return wrappee;
}
// Event Handling *********************************************************
/**
* Forwards component changes in the wrappee to listeners of this wrapper.
*/
private final class ComponentPropertyChangeHandler implements PropertyChangeListener {
@Override
public void propertyChange(PropertyChangeEvent evt) {
String propertyName = evt.getPropertyName();
if ( propertyName == null
|| propertyName.equals(PROPERTY_ENABLED)
|| propertyName.equals(PROPERTY_VISIBLE)
|| propertyName.equals(PROPERTY_EDITABLE)) {
firePropertyChange(propertyName, evt.getOldValue(), evt.getNewValue());
}
}
}
// Helper Class ***********************************************************
private static final class SimpleComponentModel extends Bean implements ComponentModel {
private boolean enabled;
private boolean visible;
private boolean editable;
SimpleComponentModel() {
this.enabled = true;
this.visible = true;
this.editable = true;
}
@Override
public boolean isEnabled() {
return enabled;
}
@Override
public void setEnabled(boolean b) {
boolean oldEnabled = isEnabled();
enabled = b;
firePropertyChange(PROPERTY_ENABLED, oldEnabled, b);
}
@Override
public boolean isVisible() {
return visible;
}
@Override
public void setVisible(boolean b) {
boolean oldVisible = isVisible();
visible = b;
firePropertyChange(PROPERTY_VISIBLE, oldVisible, b);
}
@Override
public boolean isEditable() {
return editable;
}
@Override
public void setEditable(boolean b) {
boolean oldEditable = isEditable();
editable = b;
firePropertyChange(PROPERTY_EDITABLE, oldEditable, b);
}
}
}