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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
package com.android.camera;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Xml;
import android.view.InflateException;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.HashMap;
/**
* Inflate <code>CameraPreference</code> from XML resource.
*/
public class PreferenceInflater {
private static final String PACKAGE_NAME =
PreferenceInflater.class.getPackage().getName();
private static final Class<?>[] CTOR_SIGNATURE =
new Class[] {Context.class, AttributeSet.class};
private static final HashMap<String, Constructor<?>> sConstructorMap =
new HashMap<String, Constructor<?>>();
private Context mContext;
public PreferenceInflater(Context context) {
mContext = context;
}
public CameraPreference inflate(int resId) {
return inflate(mContext.getResources().getXml(resId));
}
private CameraPreference newPreference(String tagName, Object[] args) {
String name = PACKAGE_NAME + "." + tagName;
Constructor<?> constructor = sConstructorMap.get(name);
try {
if (constructor == null) {
// Class not found in the cache, see if it's real, and try to
// add it
Class<?> clazz = mContext.getClassLoader().loadClass(name);
constructor = clazz.getConstructor(CTOR_SIGNATURE);
sConstructorMap.put(name, constructor);
}
return (CameraPreference) constructor.newInstance(args);
} catch (NoSuchMethodException e) {
throw new InflateException("Error inflating class " + name, e);
} catch (ClassNotFoundException e) {
throw new InflateException("No such class: " + name, e);
} catch (Exception e) {
throw new InflateException("While create instance of" + name, e);
}
}
private CameraPreference inflate(XmlPullParser parser) {
AttributeSet attrs = Xml.asAttributeSet(parser);
ArrayList<CameraPreference> list = new ArrayList<CameraPreference>();
Object args[] = new Object[]{mContext, attrs};
try {
for (int type = parser.next();
type != XmlPullParser.END_DOCUMENT; type = parser.next()) {
if (type != XmlPullParser.START_TAG) continue;
CameraPreference pref = newPreference(parser.getName(), args);
int depth = parser.getDepth();
if (depth > list.size()) {
list.add(pref);
} else {
list.set(depth - 1, pref);
}
if (depth > 1) {
((PreferenceGroup) list.get(depth - 2)).addChild(pref);
}
}
if (list.size() == 0) {
throw new InflateException("No root element found");
}
return list.get(0);
} catch (XmlPullParserException e) {
throw new InflateException(e);
} catch (IOException e) {
throw new InflateException(parser.getPositionDescription(), e);
}
}
}
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