Android Open Source - jadab Binding Factory

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2011 Kjetil rbekk/*from ww w. j  a v  a  2s  . c o m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. See accompanying LICENSE file.
 */

package com.github.binding.android;

import java.util.HashMap;
import java.util.Map;

import com.github.binding.Property;
import com.github.binding.android.propertyprovider.PropertyProvider;
import com.github.binding.android.propertyprovider.PropertyProviderFactory;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;

public class BindingFactory implements LayoutInflater.Factory {

    /**
     * The ViewFactory is used for testing.
     */
    interface ViewFactory {
        public View createView(String name, String prefix, AttributeSet attrs)
                throws InflateException, ClassNotFoundException;
    }
    
    static class InflaterViewFactory implements ViewFactory {
        private LayoutInflater inflater;
        
        public InflaterViewFactory(LayoutInflater inflater) {
            this.inflater = inflater;
        }
        
        @Override
        public View createView(String name, String prefix, AttributeSet attrs) 
                throws InflateException, ClassNotFoundException {
            return inflater.createView(name, prefix, attrs);
        }
    }
    
    public static final String TAG = "BindingFactory";
    
    private PropertyProviderFactory propertyProviderFactory;
    private ViewFactory viewFactory;
    private Map<String, Property<?>> boundProperties = new HashMap<String, Property<?>>();
    
    public BindingFactory(PropertyProviderFactory propertyProviderFactory,
            LayoutInflater originalInflater) {
        this.propertyProviderFactory = propertyProviderFactory;
        this.viewFactory = new InflaterViewFactory(originalInflater);
    }
    
    /**
     * Constructor used for testing.
     * 
     */
    BindingFactory(PropertyProviderFactory propertyProviderFactory,
            ViewFactory viewFactory) {
        this.propertyProviderFactory = propertyProviderFactory;
        this.viewFactory = viewFactory;
    }
    
    @Override
    public View onCreateView(String name, Context context, AttributeSet attrs) {
        Log.d(TAG, name);
        
        Map<String, String> bindingAttrs = getBindingAttrs(attrs);
        
        if (bindingAttrs != null) {
            Log.d(TAG, "Binding view: " + name);
            Log.d(TAG, "Trying to inflate with properties.");
            try {
                String prefix = AndroidPrefix.getComponentPrefix(name);
                View view = viewFactory.createView(name, prefix, attrs);
                Log.d(TAG, "Inflated view of type: " + view.getClass().getName());
                
                performBindings(bindingAttrs, view);
                
                return view;
            } catch (ClassNotFoundException e) {
                throw new RuntimeException("Tried to bind view: " + name +
                        " but could not find bindable class: " + e.getMessage());
            }
        } else {       
            return null;
        }
    }
    
    private void performBindings(Map<String, String> attrBindings, View view) {
        PropertyProvider provider = propertyProviderFactory.create(view.getClass());
        
        for (Map.Entry<String, String> entry : attrBindings.entrySet()) {
            String bindingName = entry.getKey();
            String propertyName = entry.getValue();
            
            Property<?> property = provider.getBoundProperty(view, bindingName);
            if (property == null) {
                throw new RuntimeException("Unable to perform binding '" + bindingName +
                        "'='" + propertyName + "': Unknown property.");
            }
            registerProperty(propertyName, property);
        }
    }
    
    private void registerProperty(String propertyName, Property<?> property) {
        if (boundProperties.get(propertyName) == null) {
            boundProperties.put(propertyName, property);
        } else {
            throw new RuntimeException("Property already bound: " + propertyName + ". "
                    + "Support for multiple bindings will appear in a future version.");
        }
    }

    /**
     * Get the binding attributes. Returns a map similar to the following:
     * 
     * <pre>
     * { "textFrom" => "name", "textTo" => "inputName" }
     * </pre>
     * 
     * Meaning that bindings should be created from a property called "name"
     * to the text, and from the text to a property called "inputName".
     * 
     * This corresponds to the (attrName,attrValue) values from the XML.
     */
    protected Map<String, String> getBindingAttrs(AttributeSet attrs) {
        Map<String, String> bindingAttrs = new HashMap<String, String>();
        
        int count = attrs.getAttributeCount();
        for (int i = 0; i < count; i++) {
            String attrName = attrs.getAttributeName(i);
            String attrValue = attrs.getAttributeValue(Constants.NAMESPACE, attrName);
            if (attrValue != null) {
                Log.d(TAG, "\tBinding attribute: " + attrName + " = " + attrValue);
                bindingAttrs.put(attrName, attrValue);
            }
        }
        
        if (!bindingAttrs.isEmpty()) {
            return bindingAttrs;
        } else {
            return null;
        }        
    }

    public boolean hasBindings(AttributeSet attrs) {
        return attrs.getAttributeBooleanValue(Constants.NAMESPACE, "bindable", false);
    }

    public Map<String, Property<?>> getBoundProperties() {
        return boundProperties;
    }
}

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