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      1 /*
      2  * Copyright 2012, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.dexlib2.util;
     33 
     34 import org.jf.dexlib2.AccessFlags;
     35 import org.jf.dexlib2.iface.ClassDef;
     36 import org.jf.dexlib2.iface.reference.TypeReference;
     37 
     38 import javax.annotation.Nonnull;
     39 
     40 public final class TypeUtils {
     41     public static boolean isWideType(@Nonnull String type) {
     42         char c = type.charAt(0);
     43         return c == 'J' || c == 'D';
     44     }
     45 
     46     public static boolean isWideType(@Nonnull TypeReference type) {
     47         return isWideType(type.getType());
     48     }
     49 
     50     public static boolean isPrimitiveType(String type) {
     51         return type.length() == 1;
     52     }
     53 
     54     @Nonnull
     55     public static String getPackage(@Nonnull String type) {
     56         int lastSlash = type.lastIndexOf('/');
     57         if (lastSlash < 0) {
     58             return "";
     59         }
     60         return type.substring(1, lastSlash);
     61     }
     62 
     63     public static boolean canAccessClass(@Nonnull String accessorType, @Nonnull ClassDef accesseeClassDef) {
     64         if (AccessFlags.PUBLIC.isSet(accesseeClassDef.getAccessFlags())) {
     65             return true;
     66         }
     67 
     68         // Classes can only be public or package private. Any private or protected inner classes are actually
     69         // package private.
     70         return getPackage(accesseeClassDef.getType()).equals(getPackage(accessorType));
     71     }
     72 
     73     private TypeUtils() {}
     74 }
     75