com.activeandroid.util.ReflectionUtils Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of activeandroidrx Show documentation
ActiveAndroid fork with reactive extensions.
The newest version!
package com.activeandroid.util;

/*
 * Copyright (C) 2010 Michael Pardo
 *
 * 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.
 */

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashSet;
import java.util.Set;

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;

import com.activeandroid.Model;
import com.activeandroid.annotation.Column;
import com.activeandroid.serializer.TypeSerializer;

public final class ReflectionUtils {
	//////////////////////////////////////////////////////////////////////////////////////
	// PUBLIC METHODS
	//////////////////////////////////////////////////////////////////////////////////////

	public static boolean isModel(Class type) {
		return isSubclassOf(type, Model.class) && (!Modifier.isAbstract(type.getModifiers()));
	}

	public static boolean isTypeSerializer(Class type) {
		return isSubclassOf(type, TypeSerializer.class);
	}

	// Meta-data

	@SuppressWarnings("unchecked")
	public static  T getMetaData(Context context, String name) {
		try {
			final ApplicationInfo ai = context.getPackageManager().getApplicationInfo(context.getPackageName(),
					PackageManager.GET_META_DATA);

			if (ai.metaData != null) {
				return (T) ai.metaData.get(name);
			}
		}
		catch (Exception e) {
			Log.w("Couldn't find meta-data: " + name);
		}

		return null;
	}
	
	public static Set getDeclaredColumnFields(Class type) {
		Set declaredColumnFields = Collections.emptySet();
		
		if (ReflectionUtils.isSubclassOf(type, Model.class) || Model.class.equals(type)) {
			declaredColumnFields = new LinkedHashSet();
			
			Field[] fields = type.getDeclaredFields();
			Arrays.sort(fields, new Comparator() {
				@Override
				public int compare(Field field1, Field field2) {
					return field2.getName().compareTo(field1.getName());
				}
			});
			for (Field field : fields) {
				if (field.isAnnotationPresent(Column.class)) {
					declaredColumnFields.add(field);
				}
			}
	
			Class parentType = type.getSuperclass();
			if (parentType != null) {
				declaredColumnFields.addAll(getDeclaredColumnFields(parentType));
			}
		}
		
		return declaredColumnFields;		
	}

	//////////////////////////////////////////////////////////////////////////////////////
	// PRIVATE METHODS
	//////////////////////////////////////////////////////////////////////////////////////

	public static boolean isSubclassOf(Class type, Class superClass) {
		if (type.getSuperclass() != null) {
			if (type.getSuperclass().equals(superClass)) {
				return true;
			}

			return isSubclassOf(type.getSuperclass(), superClass);
		}

		return false;
	}
}