105 lines
4.1 KiB
Java
105 lines
4.1 KiB
Java
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.util;
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import java.lang.reflect.Method;
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import java.lang.reflect.InvocationTargetException;
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/**
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* <p>Various utilities for debugging and logging.</p>
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*/
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public class DebugUtils {
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/**
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* <p>Filters objects against the <code>ANDROID_OBJECT_FILTER</code>
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* environment variable. This environment variable can filter objects
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* based on their class name and attribute values.</p>
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*
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* <p>Here is the syntax for <code>ANDROID_OBJECT_FILTER</code>:</p>
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*
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* <p><code>ClassName@attribute1=value1@attribute2=value2...</code></p>
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*
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* <p>Examples:</p>
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* <ul>
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* <li>Select TextView instances: <code>TextView</code></li>
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* <li>Select TextView instances of text "Loading" and bottom offset of 22:
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* <code>TextView@text=Loading.*@bottom=22</code></li>
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* </ul>
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*
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* <p>The class name and the values are regular expressions.</p>
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*
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* <p>This class is useful for debugging and logging purpose:</p>
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* <pre>
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* if (DEBUG) {
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* if (DebugUtils.isObjectSelected(childView) && LOGV_ENABLED) {
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* Log.v(TAG, "Object " + childView + " logged!");
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* }
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* }
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* </pre>
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*
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* <p><strong>NOTE</strong>: This method is very expensive as it relies
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* heavily on regular expressions and reflection. Calls to this method
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* should always be stripped out of the release binaries and avoided
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* as much as possible in debug mode.</p>
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*
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* @param object any object to match against the ANDROID_OBJECT_FILTER
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* environement variable
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* @return true if object is selected by the ANDROID_OBJECT_FILTER
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* environment variable, false otherwise
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*/
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public static boolean isObjectSelected(Object object) {
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boolean match = false;
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String s = System.getenv("ANDROID_OBJECT_FILTER");
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if (s != null && s.length() > 0) {
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String[] selectors = s.split("@");
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// first selector == class name
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if (object.getClass().getSimpleName().matches(selectors[0])) {
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// check potential attributes
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for (int i = 1; i < selectors.length; i++) {
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String[] pair = selectors[i].split("=");
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Class<?> klass = object.getClass();
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try {
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Method declaredMethod = null;
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Class<?> parent = klass;
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do {
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declaredMethod = parent.getDeclaredMethod("get" +
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pair[0].substring(0, 1).toUpperCase() +
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pair[0].substring(1),
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(Class[]) null);
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} while ((parent = klass.getSuperclass()) != null &&
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declaredMethod == null);
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if (declaredMethod != null) {
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Object value = declaredMethod
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.invoke(object, (Object[])null);
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match |= (value != null ?
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value.toString() : "null").matches(pair[1]);
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}
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} catch (NoSuchMethodException e) {
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e.printStackTrace();
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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} catch (InvocationTargetException e) {
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e.printStackTrace();
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}
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}
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}
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}
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return match;
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}
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}
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