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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.drm.mobile1;
     18 
     19 /**
     20  * This class provides interfaces to access the DRM rights.
     21  */
     22 public class DrmRights {
     23     /**
     24      * The DRM permission of play.
     25      */
     26     public static final int DRM_PERMISSION_PLAY = 1;
     27 
     28     /**
     29      * The DRM permission of display.
     30      */
     31     public static final int DRM_PERMISSION_DISPLAY = 2;
     32 
     33     /**
     34      * The DRM permission of execute.
     35      */
     36     public static final int DRM_PERMISSION_EXECUTE = 3;
     37 
     38     /**
     39      * The DRM permission of print.
     40      */
     41     public static final int DRM_PERMISSION_PRINT = 4;
     42 
     43     /**
     44      * Successful operation.
     45      */
     46     private static final int JNI_DRM_SUCCESS = 0;
     47 
     48     /**
     49      * General failure.
     50      */
     51     private static final int JNI_DRM_FAILURE = -1;
     52 
     53     /**
     54      * The uid of this rights object.
     55      */
     56     private String roId = "";
     57 
     58 
     59     /**
     60      * Construct the DrmRights.
     61      */
     62     public DrmRights() {
     63     }
     64 
     65     /**
     66      * Get the constraint of the given permission on this rights object.
     67      *
     68      * @param permission    the given permission.
     69      *
     70      * @return a DrmConstraint instance.
     71      */
     72     public DrmConstraintInfo getConstraint(int permission) {
     73         DrmConstraintInfo c = new DrmConstraintInfo();
     74 
     75         /* call native method to get latest constraint information */
     76         int res = nativeGetConstraintInfo(permission, c);
     77 
     78         if (JNI_DRM_FAILURE == res)
     79             return null;
     80 
     81         return c;
     82     }
     83 
     84     /**
     85      * Consume the rights of the given permission.
     86      *
     87      * @param permission    the given permission.
     88      *
     89      * @return true if consume success.
     90      *         false if consume failure.
     91      */
     92     public boolean consumeRights(int permission) {
     93         /* call native method to consume and update rights */
     94         int res = nativeConsumeRights(permission);
     95 
     96         if (JNI_DRM_FAILURE == res)
     97             return false;
     98 
     99         return true;
    100     }
    101 
    102 
    103     /**
    104      * native method: get the constraint information of the given permission.
    105      *
    106      * @param permission    the given permission.
    107      * @param constraint    the instance of constraint.
    108      *
    109      * @return #JNI_DRM_SUCCESS if succeed.
    110      *         #JNI_DRM_FAILURE if fail.
    111      */
    112     private native int nativeGetConstraintInfo(int permission, DrmConstraintInfo constraint);
    113 
    114     /**
    115      * native method: consume the rights of the given permission.
    116      *
    117      * @param permission    the given permission.
    118      *
    119      * @return #JNI_DRM_SUCCESS if succeed.
    120      *         #JNI_DRM_FAILURE if fail.
    121      */
    122     private native int nativeConsumeRights(int permission);
    123 
    124 
    125     /**
    126      * Load the shared library to link the native methods.
    127      */
    128     static {
    129         try {
    130             System.loadLibrary("drm1_jni");
    131         }
    132         catch (UnsatisfiedLinkError ule) {
    133             System.err.println("WARNING: Could not load libdrm1_jni.so");
    134         }
    135     }
    136 }
    137