connectivity/source/drivers/jdbc/Blob.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <java/sql/Blob.hxx>
  21 #include <java/io/InputStream.hxx>
  22 #include <connectivity/dbexception.hxx>
  23 #include <osl/diagnose.h>
  24
  25 #include <string.h>
  26
  27 using namespace connectivity;
  28
  29 //************ Class: java.sql.Blob
  30
  31
  32 jclass java_sql_Blob::theClass = nullptr;
  33 java_sql_Blob::java_sql_Blob( JNIEnv * pEnv, jobject myObj )
  34     : java_lang_Object( pEnv, myObj )
  35 {
  36     SDBThreadAttach::addRef();
  37 }
  38 java_sql_Blob::~java_sql_Blob()
  39 {
  40     SDBThreadAttach::releaseRef();
  41 }
  42
  43 jclass java_sql_Blob::getMyClass() const
  44 {
  45     // the class must be fetched only once, therefore it's static
  46     if( !theClass )
  47         theClass = findMyClass("java/sql/Blob");
  48     return theClass;
  49 }
  50
  51 sal_Int64 SAL_CALL java_sql_Blob::length(  )
  52 {
  53     jlong out(0);
  54     SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");
  55
  56     {
  57         // initialize temporary variable
  58         static const char * const cSignature = "()J";
  59         static const char * const cMethodName = "length";
  60         // submit Java-Call
  61         static jmethodID mID(nullptr);
  62         obtainMethodId_throwSQL(t.pEnv, cMethodName,cSignature, mID);
  63         out = t.pEnv->CallLongMethod( object, mID );
  64         ThrowSQLException(t.pEnv,*this);
  65     } //t.pEnv
  66     return static_cast<sal_Int64>(out);
  67 }
  68 css::uno::Sequence< sal_Int8 > SAL_CALL java_sql_Blob::getBytes( sal_Int64 pos, sal_Int32 count )
  69 {
  70
  71     SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");
  72     css::uno::Sequence< sal_Int8 > aSeq;
  73     {
  74         // initialize temporary variable
  75         static const char * const cSignature = "(JI)[B";
  76         static const char * const cMethodName = "getBytes";
  77         // submit Java-Call
  78         static jmethodID mID(nullptr);
  79         obtainMethodId_throwSQL(t.pEnv, cMethodName,cSignature, mID);
  80         jbyteArray out = static_cast<jbyteArray>(t.pEnv->CallObjectMethod( object, mID,pos,count));
  81         ThrowSQLException(t.pEnv,*this);
  82         if(out)
  83         {
  84             jboolean p = false;
  85             aSeq.realloc(t.pEnv->GetArrayLength(out));
  86             memcpy(aSeq.getArray(),t.pEnv->GetByteArrayElements(out,&p),aSeq.getLength());
  87             t.pEnv->DeleteLocalRef(out);
  88         }
  89     } //t.pEnv
  90     // WARNING: the caller becomes the owner of the returned pointer
  91     return  aSeq;
  92 }
  93
  94 css::uno::Reference< css::io::XInputStream > SAL_CALL java_sql_Blob::getBinaryStream(  )
  95 {
  96     SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");
  97     static jmethodID mID(nullptr);
  98     jobject out = callObjectMethod(t.pEnv,"getBinaryStream","()Ljava/io/InputStream;", mID);
  99     // WARNING: the caller becomes the owner of the returned pointer
 100     return out==nullptr ? nullptr : new java_io_InputStream( t.pEnv, out );
 101 }
 102
 103 sal_Int64 SAL_CALL java_sql_Blob::position( const css::uno::Sequence< sal_Int8 >& pattern, sal_Int64 start )
 104 {
 105     jlong out(0);
 106     SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");
 107
 108     {
 109         // initialize temporary variable
 110         static const char * const cSignature = "([BI)J";
 111         static const char * const cMethodName = "position";
 112         // submit Java-Call
 113         static jmethodID mID(nullptr);
 114         obtainMethodId_throwSQL(t.pEnv, cMethodName,cSignature, mID);
 115         // convert Parameter
 116         jbyteArray pByteArray = t.pEnv->NewByteArray(pattern.getLength());
 117         jbyte * patternData = reinterpret_cast<jbyte *>(
 118             const_cast<sal_Int8 *>(pattern.getConstArray()));
 119             // 4th param of Set*ArrayRegion changed from pointer to non-const to
 120             // pointer to const between <http://docs.oracle.com/javase/6/docs/
 121             // technotes/guides/jni/spec/functions.html#wp22933> and
 122             // <http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/
 123             // functions.html#wp22933>; work around that difference in a way
 124             // that doesn't trigger loplugin:redundantcast
 125         t.pEnv->SetByteArrayRegion(pByteArray,0,pattern.getLength(),patternData);
 126         out = t.pEnv->CallLongMethod( object, mID, pByteArray,start );
 127         t.pEnv->DeleteLocalRef(pByteArray);
 128         ThrowSQLException(t.pEnv,*this);
 129     } //t.pEnv
 130     return static_cast<sal_Int64>(out);
 131 }
 132
 133 sal_Int64 SAL_CALL java_sql_Blob::positionOfBlob( const css::uno::Reference< css::sdbc::XBlob >& /*pattern*/, sal_Int64 /*start*/ )
 134 {
 135     ::dbtools::throwFeatureNotImplementedSQLException( "XBlob::positionOfBlob", *this );
 136     // this was put here in CWS warnings01. The previous implementation was defective, as it did ignore
 137     // the pattern parameter. Since the effort for proper implementation is rather high - we would need
 138     // to translated pattern into a byte[] -, we defer this functionality for the moment (hey, it was
 139     // unusable, anyway)
 140     // #i57457#
 141     return 0;
 142 }
 143
 144 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */