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ComponentAdapter.java
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ComponentAdapter.java
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/**
* @project RoboMVVM
* @project RoboMVVM(https://github.com/debdattabasu/RoboMVVM)
* @author Debdatta Basu
*
* @license 3-clause BSD license(http:https://opensource.org/licenses/BSD-3-Clause).
* Copyright (c) 2014, Debdatta Basu. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that
* the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER 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, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.dbasu.robomvvm.componentmodel;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.RatingBar;
import android.widget.SeekBar;
import android.widget.TextView;
import com.google.common.base.Preconditions;
import org.dbasu.robomvvm.componentadapter.adapterview.AdapterViewAdapter;
import org.dbasu.robomvvm.componentadapter.compoundbutton.CompoundButtonViewAdapter;
import org.dbasu.robomvvm.componentadapter.edittext.EditTextViewAdapter;
import org.dbasu.robomvvm.componentadapter.imageview.ImageViewAdapter;
import org.dbasu.robomvvm.componentadapter.listview.ListViewAdapter;
import org.dbasu.robomvvm.componentadapter.menuitem.MenuItemAdapter;
import org.dbasu.robomvvm.componentadapter.progressbar.ProgressBarViewAdapter;
import org.dbasu.robomvvm.componentadapter.ratingbar.RatingBarViewAdapter;
import org.dbasu.robomvvm.componentadapter.seekbar.SeekBarViewAdapter;
import org.dbasu.robomvvm.componentadapter.textview.TextViewAdapter;
import org.dbasu.robomvvm.componentadapter.view.ViewAdapter;
import org.dbasu.robomvvm.util.ObjectTagger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* An adapter to make components from arbitrary objects. Make associations between object classes and component adapters
* classes using {@link ComponentAdapter.Associations}. Create or retrieve the component adapter
* of an object of one of the associated types or their subtypes using {@link #get(Object)}.
*/
public class ComponentAdapter extends Component {
private static final String COMPONENT_ADAPTER = "robomvvm_component_adapter";
/**
* Can make associations between arbitrary classes and the {@link ComponentAdapter} subclasses that are used to make
* components out of them.
*/
public static class Associations {
static {
adapterTypes = new HashMap<Class<?>, Class<? extends ComponentAdapter>>();
set(MenuItem.class, MenuItemAdapter.class);
set(View.class, ViewAdapter.class);
set(ImageView.class, ImageViewAdapter.class);
set(TextView.class, TextViewAdapter.class);
set(EditText.class, EditTextViewAdapter.class);
set(CompoundButton.class, CompoundButtonViewAdapter.class);
set(ProgressBar.class, ProgressBarViewAdapter.class);
set(SeekBar.class, SeekBarViewAdapter.class);
set(RatingBar.class, RatingBarViewAdapter.class);
set(AdapterView.class, AdapterViewAdapter.class);
set(ListView.class, ListViewAdapter.class);
}
private static final Map<Class<?>, Class<? extends ComponentAdapter>> adapterTypes;
/**
* Get the associated component adapter class associated with a class. If no
* component adapter class is associated with the supplied class, then its super classes and interfaces
* are searched until a component adapter association is found.
* @param objectType
* The class of the object to find associations for.
* @return
* The associated component adapter class, or null if none is found.
*/
public synchronized static Class<? extends ComponentAdapter> get(Class<?> objectType) {
Preconditions.checkNotNull(objectType);
Class<? extends ComponentAdapter> adapterType = null;
Class<?> myObjectType = objectType;
List<Class<?>> reachableObjectTypes = new ArrayList<Class<?>>();
while (myObjectType!= null) {
reachableObjectTypes.add(myObjectType);
reachableObjectTypes.addAll(Arrays.asList(myObjectType.getInterfaces()));
myObjectType = myObjectType.getSuperclass();
}
for(Class<?> klazz : reachableObjectTypes) {
adapterType = adapterTypes.get(klazz);
if(adapterType != null) return adapterType;
}
return null;
}
/**
* Associates a component adapter class with an arbitrary class.
* @param objectType
* The class to make the association for. If an association already exists for this class, then it is overwritten.
* @param adapterType
* The component adapter class to associate with the supplied class.
* If this is null, then any existing association of the supplied class is removed.
*/
public synchronized static void set(Class<?> objectType, Class<? extends ComponentAdapter> adapterType) {
Preconditions.checkNotNull(objectType);
if(adapterType != null) {
adapterTypes.put(objectType, adapterType);
}
else {
adapterTypes.remove(objectType);
}
}
}
/**
* Create or retrieve the component adapter for the supplied object. Once created, the component adapter is stored as a tag
* on the supplied object using {@link org.dbasu.robomvvm.util.ObjectTagger}, which stores weak references to the supplied object to
* allow for Garbage Collection. Any component adapter associated with an object that has been garbage collected is not stored
* internally by the library.
*
* @param targetObject
* The object to get the component adapter for.
* @return
* The component adapter for the supplied object.
*
* @throws java.lang.RuntimeException
* When no component adapter class is associated with
* the class of the supplied object.
*/
public synchronized static ComponentAdapter get(Object targetObject) {
Preconditions.checkNotNull(targetObject);
ComponentAdapter componentAdapter = (ComponentAdapter) ObjectTagger.getTag(targetObject, COMPONENT_ADAPTER);
if (componentAdapter != null) return componentAdapter;
Class<? extends ComponentAdapter> adapterType = Associations.get(targetObject.getClass());
if(adapterType == null) {
throw new RuntimeException("No ComponentAdapter Subclass Associated With " + targetObject.getClass().getName() +
". Call ComponentAdapter.Associations.set(Class<?> objectType, Class<? extends ComponentAdapter> adapterType) " +
"To Make The Association.");
}
try {
componentAdapter = adapterType.newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
componentAdapter.init(targetObject);
ObjectTagger.setTag(targetObject, COMPONENT_ADAPTER, componentAdapter);
return componentAdapter;
}
protected Object targetObject;
protected ComponentAdapter() {
}
/**
* Gets the target object of this component adapter.
* @return
* Returns the target object.
*/
public Object getTargetObject() {
return targetObject;
}
private void init(Object targetObject) {
this.targetObject = targetObject;
adapt();
}
/**
* Call this function in subclasses to set up the component adapter.
*/
protected void adapt() {
}
}