gecko-dev/storage/public/mozIStorageValueArray.idl

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

[ptr] native octetPtr(PRUint8);

/**
 * mozIStorageValueArray wraps an array of SQL values, such as a single database
 * row.
 */
[scriptable, uuid(07b5b93e-113c-4150-863c-d247b003a55d)]
interface mozIStorageValueArray : nsISupports {
  /**
   * These type values are returned by getTypeOfIndex
   * to indicate what type of value is present at
   * a given column.
   */
  const long VALUE_TYPE_NULL = 0;
  const long VALUE_TYPE_INTEGER = 1;
  const long VALUE_TYPE_FLOAT = 2;
  const long VALUE_TYPE_TEXT = 3;
  const long VALUE_TYPE_BLOB = 4;

  /**
   * numEntries
   *
   * number of entries in the array (each corresponding to a column
   * in the database row)
   */
  readonly attribute unsigned long numEntries;

  /**
   * Returns the type of the value at the given column index;
   * one of VALUE_TYPE_NULL, VALUE_TYPE_INTEGER, VALUE_TYPE_FLOAT,
   * VALUE_TYPE_TEXT, VALUE_TYPE_BLOB.
   */
  long getTypeOfIndex(in unsigned long aIndex);

  /**
   * Obtain a value for the given entry (column) index.
   * Due to SQLite's type conversion rules, any of these are valid
   * for any column regardless of the column's data type.  However,
   * if the specific type matters, getTypeOfIndex should be used
   * first to identify the column type, and then the appropriate
   * get method should be called.
   *
   * If you ask for a string value for a NULL column, you will get an empty
   * string with IsVoid set to distinguish it from an explicitly set empty
   * string.
   */
  long getInt32(in unsigned long aIndex);
  long long getInt64(in unsigned long aIndex);
  double getDouble(in unsigned long aIndex);
  AUTF8String getUTF8String(in unsigned long aIndex);
  AString getString(in unsigned long aIndex);

  // data will be NULL if dataSize = 0
  void getBlob(in unsigned long aIndex, out unsigned long aDataSize, [array,size_is(aDataSize)] out octet aData);
  boolean getIsNull(in unsigned long aIndex);

  /**
   * Returns a shared string pointer
   */
  [noscript] void getSharedUTF8String(in unsigned long aIndex, out unsigned long aLength, [shared,retval] out string aResult);
  [noscript] void getSharedString(in unsigned long aIndex, out unsigned long aLength, [shared,retval] out wstring aResult);
  [noscript] void getSharedBlob(in unsigned long aIndex, out unsigned long aLength, [shared,retval] out octetPtr aResult);

%{C++
  /**
   * Getters for native code that return their values as
   * the return type, for convenience and sanity.
   *
   * Not virtual; no vtable bloat.
   */

  inline PRInt32 AsInt32(PRUint32 idx) {
    PRInt32 v = 0;
#ifdef DEBUG
    nsresult rv =
#endif
      GetInt32(idx, &v);
    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) || IsNull(idx),
                      "Getting value failed, wrong column index?");
    return v;
  }

  inline PRInt64 AsInt64(PRUint32 idx) {
    PRInt64 v = 0;
#ifdef DEBUG
    nsresult rv =
#endif
      GetInt64(idx, &v);
    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) || IsNull(idx),
                      "Getting value failed, wrong column index?");
    return v;
  }

  inline double AsDouble(PRUint32 idx) {
    double v = 0.0;
#ifdef DEBUG
    nsresult rv =
#endif
      GetDouble(idx, &v);
    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) || IsNull(idx),
                      "Getting value failed, wrong column index?");
    return v;
  }

  inline const char* AsSharedUTF8String(PRUint32 idx, PRUint32 *len) {
    const char *str = nullptr;
    *len = 0;
#ifdef DEBUG
    nsresult rv =
#endif
      GetSharedUTF8String(idx, len, &str);
    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) || IsNull(idx),
                      "Getting value failed, wrong column index?");
    return str;
  }

  inline const PRUnichar* AsSharedWString(PRUint32 idx, PRUint32 *len) {
    const PRUnichar *str = nullptr;
    *len = 0;
#ifdef DEBUG
    nsresult rv =
#endif
      GetSharedString(idx, len, &str);
    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) || IsNull(idx),
                      "Getting value failed, wrong column index?");
    return str;
  }

  inline const PRUint8* AsSharedBlob(PRUint32 idx, PRUint32 *len) {
    const PRUint8 *blob = nullptr;
    *len = 0;
#ifdef DEBUG
    nsresult rv =
#endif
      GetSharedBlob(idx, len, &blob);
    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) || IsNull(idx),
                      "Getting value failed, wrong column index?");
    return blob;
  }

  inline bool IsNull(PRUint32 idx) {
    bool b = PR_FALSE;
#ifdef DEBUG
    nsresult rv =
#endif
      GetIsNull(idx, &b);
    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv),
                      "Getting value failed, wrong column index?");
    return b;
  }

%}

};