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      1 /*
      2  * Copyright (C) 2010 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 #ifndef __DRM_METADATA_H__
     18 #define __DRM_METADATA_H__
     19 
     20 #include "drm_framework_common.h"
     21 
     22 namespace android {
     23 
     24 /**
     25  * This is an utility class which contains the constraints information.
     26  *
     27  * As a result of DrmManagerClient::getMetadata(const String8*)
     28  * an instance of DrmMetadata would be returned.
     29  */
     30 class DrmMetadata {
     31 public:
     32     /**
     33      * Iterator for key
     34      */
     35     class KeyIterator {
     36         friend class DrmMetadata;
     37     private:
     38         KeyIterator(DrmMetadata* drmMetadata) : mDrmMetadata(drmMetadata), mIndex(0) {}
     39 
     40     public:
     41         KeyIterator(const KeyIterator& keyIterator);
     42         KeyIterator& operator=(const KeyIterator& keyIterator);
     43         virtual ~KeyIterator() {}
     44 
     45     public:
     46         bool hasNext();
     47         const String8& next();
     48 
     49     private:
     50         DrmMetadata* mDrmMetadata;
     51         unsigned int mIndex;
     52     };
     53 
     54     /**
     55      * Iterator for constraints
     56      */
     57     class Iterator {
     58         friend class DrmMetadata;
     59     private:
     60         Iterator(DrmMetadata* drmMetadata) : mDrmMetadata(drmMetadata), mIndex(0) {}
     61 
     62     public:
     63         Iterator(const Iterator& iterator);
     64         Iterator& operator=(const Iterator& iterator);
     65         virtual ~Iterator() {}
     66 
     67     public:
     68         bool hasNext();
     69         String8 next();
     70 
     71     private:
     72         DrmMetadata* mDrmMetadata;
     73         unsigned int mIndex;
     74     };
     75 
     76 public:
     77     DrmMetadata() {}
     78     virtual ~DrmMetadata() {
     79         DrmMetadata::KeyIterator keyIt = this->keyIterator();
     80 
     81         while (keyIt.hasNext()) {
     82             String8 key = keyIt.next();
     83             const char* value = this->getAsByteArray(&key);
     84             if (NULL != value) {
     85                 delete[] value;
     86                 value = NULL;
     87             }
     88         }
     89         mMetadataMap.clear();
     90     }
     91 
     92 public:
     93     int getCount(void) const;
     94     status_t put(const String8* key, const char* value);
     95     String8 get(const String8& key) const;
     96     const char* getAsByteArray(const String8* key) const;
     97     KeyIterator keyIterator();
     98     Iterator iterator();
     99 
    100 private:
    101     const char* getValue(const String8* key) const;
    102 
    103 private:
    104     typedef KeyedVector<String8, const char*> DrmMetadataMap;
    105     DrmMetadataMap mMetadataMap;
    106 };
    107 
    108 };
    109 
    110 #endif /* __DRM_METADATA_H__ */
    111 
    112