Android Open Source - interdroid-vdb Strict Util

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The source code is released under:
Copyright (c) 2008-2012 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...
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Java Source Code

/*
 * Copyright (c) 2008-2012 Vrije Universiteit, The Netherlands All rights
 * reserved.// w  ww  . jav  a2s  . c o  m
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Vrije Universiteit nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package interdroid.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A wrapper class to allow us to turn on StrictMode on devices which support
 * it but leave the calls in for devices which do not.
 *
 * This class uses reflection to setup StrictMode on devices which support it.
 *
 * @author nick &gt;palmer@cs.vu.nl&lt;
 *
 */
public final class StrictUtil {
  /**
   * Access to logger.
   */
  private static final Logger LOG = LoggerFactory.getLogger(StrictUtil.class);

  /**
   * No construction.
   */
  private StrictUtil() {
    // No construction
  }

  /**
   * Is developer mode on.
   */
  private static boolean sDeveloperMode = false;

  /**
   * Turns on developer mode system wide.
   */
  public static void setDeveloperMode() {
    sDeveloperMode = true;
  }

  /**
   * Sets the thread policy for strict mode to all with
   * log and death penalties.
   */
  public static void setThreadPolicies() {
    if (sDeveloperMode) {
      Class<?> strictMode;
      try {
        strictMode =
            Class.forName(
                "android.os.StrictMode");

        setThreadPolicy(strictMode);
      } catch (Exception e) {
        if (LOG.isWarnEnabled()) {
          LOG.warn("Exception setting Strict ThreadPolicy", e);
        }
      }
    }
  }

  /**
   * Sets the thread and vm policy for strict mode to all with log
   * and death penalties.
   */
  public static void setDeveloperPolicies() {
    if (sDeveloperMode) {
      Class<?> strictMode;
      try {
        strictMode =
            Class.forName(
                "android.os.StrictMode");

        setThreadPolicy(strictMode);
        setVmPolicy(strictMode);
      } catch (Exception e) {
        if (LOG.isWarnEnabled()) {
          LOG.warn("Exception setting thread and vm policy", e);
        }
      }
    }
  }

  /**
   * Sets the vm policy.
   *
   * @param strictMode
   *            the strict mode to work with
   * @throws ClassNotFoundException
   *             on problem
   * @throws NoSuchMethodException
   *             on problem
   * @throws InstantiationException
   *             on problem
   * @throws IllegalAccessException
   *             on problem
   * @throws InvocationTargetException
   *             on problem
   */
  private static void setVmPolicy(final Class<?> strictMode)
      throws ClassNotFoundException, NoSuchMethodException,
      InstantiationException, IllegalAccessException,
      InvocationTargetException {
    Class<?> vmPolicyType =
        Class.forName("android.os.StrictMode$VmPolicy");
    Method setVmPolicy =
        strictMode.getMethod("setVmPolicy",
            vmPolicyType);
    Class<?> vmPolicyBuilder = Class
        .forName(
          "android.os.StrictMode$VmPolicy$Builder");

    Object policy = buildPolicy(vmPolicyBuilder);
    setVmPolicy.invoke(strictMode, policy);
  }

  /**
   * Sets the thread policy.
   *
   * @param strictMode
   *            the strict mode to work with
   * @throws ClassNotFoundException
   *             on problem
   * @throws NoSuchMethodException
   *             on problem
   * @throws InstantiationException
   *             on problem
   * @throws IllegalAccessException
   *             on problem
   * @throws InvocationTargetException
   *             on problem
   */
  private static void setThreadPolicy(final Class<?> strictMode)
      throws ClassNotFoundException, NoSuchMethodException,
      InstantiationException, IllegalAccessException,
      InvocationTargetException {

    Class<?> threadPolicyType = Class
        .forName("android.os.StrictMode$ThreadPolicy");
    Method setThreadPolicy = strictMode.getMethod("setThreadPolicy",
        threadPolicyType);
    Class<?> threadPolicyBuilder = Class
        .forName(
          "android.os.StrictMode$ThreadPolicy$Builder");

    Object policy = buildPolicy(threadPolicyBuilder);
    setThreadPolicy.invoke(strictMode, policy);
  }

  /**
   * Builds a policy with detectAll, penaltyLog and penaltyDeath.
   *
   * @param policyBuilder
   *            the builder to use
   * @return the policy object
   * @throws NoSuchMethodException
   *             on problem
   * @throws InstantiationException
   *             on problem
   * @throws IllegalAccessException
   *             on problem
   * @throws InvocationTargetException
   *             on problem
   */
  private static Object buildPolicy(final Class<?> policyBuilder)
      throws NoSuchMethodException, InstantiationException,
      IllegalAccessException, InvocationTargetException {
    Method detectAll = policyBuilder.getMethod("detectAll");
    Method penaltyLog = policyBuilder.getMethod("penaltyLog");
    Method penaltyDeath = policyBuilder.getMethod("penaltyDeath");
    Method build = policyBuilder.getMethod("build");
    Constructor<?> constructor = policyBuilder.getConstructor();

    Object builder = constructor.newInstance();
    builder = detectAll.invoke(builder);
    builder = penaltyLog.invoke(builder);
    builder = penaltyDeath.invoke(builder);
    return build.invoke(builder);
  }
}
Java Source Code List
