Inspects a link Configuration through reflection API to generate a human readable String with values replaced with their constants names. : String « Date Type « Android

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Android » Date Type » String 
Inspects a link Configuration through reflection API to generate a human readable String with values replaced with their constants names.
    
/*
 *  Copyright 2010 Emmanuel Astier & Kevin Gaudin
 *
 *  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 org.acra.util;

//import static org.acra.ACRA.LOG_TAG;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;

import android.content.res.Configuration;
import android.util.Log;
import android.util.SparseArray;

/**
 * Inspects a {@link Configuration} object through reflection API in order to
 * generate a human readable String with values replaced with their constants
 * names. The {@link Configuration#toString()} method was not enough as values
 * like 0, 1, 2 or 3 don't look readable to me. Using reflection API allows to
 * retrieve hidden fields and can make us hope to be compatible with all Android
 * API levels, even those which are not published yet.
 
 @author Kevin Gaudin
 
 */
final class ConfigurationInspector {

    private static final String SUFFIX_MASK = "_MASK";
    private static final String FIELD_SCREENLAYOUT = "screenLayout";
    private static final String FIELD_UIMODE = "uiMode";
    private static final String FIELD_MNC = "mnc";
    private static final String FIELD_MCC = "mcc";
    private static final String PREFIX_UI_MODE = "UI_MODE_";
    private static final String PREFIX_TOUCHSCREEN = "TOUCHSCREEN_";
    private static final String PREFIX_SCREENLAYOUT = "SCREENLAYOUT_";
    private static final String PREFIX_ORIENTATION = "ORIENTATION_";
    private static final String PREFIX_NAVIGATIONHIDDEN = "NAVIGATIONHIDDEN_";
    private static final String PREFIX_NAVIGATION = "NAVIGATION_";
    private static final String PREFIX_KEYBOARDHIDDEN = "KEYBOARDHIDDEN_";
    private static final String PREFIX_KEYBOARD = "KEYBOARD_";
    private static final String PREFIX_HARDKEYBOARDHIDDEN = "HARDKEYBOARDHIDDEN_";
    private static SparseArray<String> mHardKeyboardHiddenValues = new SparseArray<String>();
    private static SparseArray<String> mKeyboardValues = new SparseArray<String>();
    private static SparseArray<String> mKeyboardHiddenValues = new SparseArray<String>();
    private static SparseArray<String> mNavigationValues = new SparseArray<String>();
    private static SparseArray<String> mNavigationHiddenValues = new SparseArray<String>();
    private static SparseArray<String> mOrientationValues = new SparseArray<String>();
    private static SparseArray<String> mScreenLayoutValues = new SparseArray<String>();
    private static SparseArray<String> mTouchScreenValues = new SparseArray<String>();
    private static SparseArray<String> mUiModeValues = new SparseArray<String>();

    private static final HashMap<String, SparseArray<String>> mValueArrays = new HashMap<String, SparseArray<String>>();

    // Static init
    static {
        mValueArrays.put(PREFIX_HARDKEYBOARDHIDDEN, mHardKeyboardHiddenValues);
        mValueArrays.put(PREFIX_KEYBOARD, mKeyboardValues);
        mValueArrays.put(PREFIX_KEYBOARDHIDDEN, mKeyboardHiddenValues);
        mValueArrays.put(PREFIX_NAVIGATION, mNavigationValues);
        mValueArrays.put(PREFIX_NAVIGATIONHIDDEN, mNavigationHiddenValues);
        mValueArrays.put(PREFIX_ORIENTATION, mOrientationValues);
        mValueArrays.put(PREFIX_SCREENLAYOUT, mScreenLayoutValues);
        mValueArrays.put(PREFIX_TOUCHSCREEN, mTouchScreenValues);
        mValueArrays.put(PREFIX_UI_MODE, mUiModeValues);

        for (final Field f : Configuration.class.getFields()) {
            if (Modifier.isStatic(f.getModifiers()) && Modifier.isFinal(f.getModifiers())) {
                final String fieldName = f.getName();
                try {
                    if (fieldName.startsWith(PREFIX_HARDKEYBOARDHIDDEN)) {
                        mHardKeyboardHiddenValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_KEYBOARD)) {
                        mKeyboardValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_KEYBOARDHIDDEN)) {
                        mKeyboardHiddenValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_NAVIGATION)) {
                        mNavigationValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_NAVIGATIONHIDDEN)) {
                        mNavigationHiddenValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_ORIENTATION)) {
                        mOrientationValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_SCREENLAYOUT)) {
                        mScreenLayoutValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_TOUCHSCREEN)) {
                        mTouchScreenValues.put(f.getInt(null), fieldName);
                    else if (fieldName.startsWith(PREFIX_UI_MODE)) {
                        mUiModeValues.put(f.getInt(null), fieldName);
                    }
                catch (IllegalArgumentException e) {
                 //   Log.w(LOG_TAG, "Error while inspecting device configuration: ", e);
                catch (IllegalAccessException e) {
                 //   Log.w(LOG_TAG, "Error while inspecting device configuration: ", e);
                }
            }
        }
    }

    /**
     * Use this method to generate a human readable String listing all values
     * from the provided Configuration instance.
     
     @param conf
     *            The Configuration to be described.
     @return A String describing all the fields of the given Configuration,
     *         with values replaced by constant names.
     */
    public static String toString(Configuration conf) {
        final StringBuilder result = new StringBuilder();
        for (final Field f : conf.getClass().getFields()) {
            try {
                if (!Modifier.isStatic(f.getModifiers())) {
                    final String fieldName = f.getName();
                    result.append(fieldName).append('=');
                    if (f.getType().equals(int.class)) {
                        result.append(getFieldValueName(conf, f));
                    else {
                        result.append(f.get(conf).toString());
                    }
                    result.append('\n');
                }
            catch (IllegalArgumentException e) {
              //  Log.e(LOG_TAG, "Error while inspecting device configuration: ", e);
            catch (IllegalAccessException e) {
             //   Log.e(LOG_TAG, "Error while inspecting device configuration: ", e);
            }
        }
        return result.toString();
    }

    /**
     * Retrieve the name of the constant defined in the {@link Configuration}
     * class which defines the value of a field in a {@link Configuration}
     * instance.
     
     @param conf
     *            The instance of {@link Configuration} where the value is
     *            stored.
     @param f
     *            The {@link Field} to be inspected in the {@link Configuration}
     *            instance.
     @return The value of the field f in instance conf translated to its
     *         constant name.
     @throws IllegalAccessException if the supplied field is inaccessible.
     */
    private static String getFieldValueName(Configuration conf, Field fthrows IllegalAccessException {
        final String fieldName = f.getName();
        if (fieldName.equals(FIELD_MCC|| fieldName.equals(FIELD_MNC)) {
            return Integer.toString(f.getInt(conf));
        else if (fieldName.equals(FIELD_UIMODE)) {
            return activeFlags(mValueArrays.get(PREFIX_UI_MODE), f.getInt(conf));
        else if (fieldName.equals(FIELD_SCREENLAYOUT)) {
            return activeFlags(mValueArrays.get(PREFIX_SCREENLAYOUT), f.getInt(conf));
        else {
            final SparseArray<String> values = mValueArrays.get(fieldName.toUpperCase() '_');
            if (values == null) {
                // Unknown field, return the raw int as String
                return Integer.toString(f.getInt(conf));
            }

            final String value = values.get(f.getInt(conf));
            if (value == null) {
                // Unknown value, return the raw int as String
                return Integer.toString(f.getInt(conf));
            }
            return value;
        }
    }

    /**
     * Some fields contain multiple value types which can be isolated by
     * applying a bitmask. That method returns the concatenation of active
     * values.
     
     @param valueNames
     *            The array containing the different values and names for this
     *            field. Must contain mask values too.
     @param bitfield
     *            The bitfield to inspect.
     @return The names of the different values contained in the bitfield,
     *         separated by '+'.
     */
    private static String activeFlags(SparseArray<String> valueNames, int bitfield) {
        final StringBuilder result = new StringBuilder();

        // Look for masks, apply it an retrieve the masked value
        for (int i = 0; i < valueNames.size(); i++) {
            final int maskValue = valueNames.keyAt(i);
            if (valueNames.get(maskValue).endsWith(SUFFIX_MASK)) {
                final int value = bitfield & maskValue;
                if (value > 0) {
                    if (result.length() 0) {
                        result.append('+');
                    }
                    result.append(valueNames.get(value));
                }
            }
        }
        return result.toString();
    }
}

   
    
    
    
  
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