gecko-dev/storage/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"
%{C++
#include "mozilla/DebugOnly.h"
%}

[ptr] native octetPtr(uint8_t);

/**
 * mozIStorageValueArray wraps an array of SQL values, such as a single database
 * row.
 */
[scriptable, uuid(6e6306f4-ffa7-40f5-96ca-36159ce8f431)]
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);
  AString getBlobAsString(in unsigned long aIndex);
  AUTF8String getBlobAsUTF8String(in unsigned long aIndex);
  boolean getIsNull(in unsigned long aIndex);

  /**
   * Returns a shared string pointer.
   *
   * @param aIndex
   *        0-based colummn index.
   * @param aByteLength
   *        The number of bytes in the string or blob. This is the same as the
   *        number of characters for UTF-8 strings, and twice the number of
   *        characters for UTF-16 strings.
   * @param aResult
   *        A pointer to the string or blob.
   */
  [noscript] void getSharedUTF8String(in unsigned long aIndex, out unsigned long aByteLength, [shared,retval] out string aResult);
  [noscript] void getSharedString(in unsigned long aIndex, out unsigned long aByteLength, [shared,retval] out wstring aResult);
  [noscript] void getSharedBlob(in unsigned long aIndex, out unsigned long aByteLength, [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 int32_t AsInt32(uint32_t idx) {
    int32_t v = 0;
    mozilla::DebugOnly<nsresult> rv = GetInt32(idx, &v);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return v;
  }

  inline int64_t AsInt64(uint32_t idx) {
    int64_t v = 0;
    mozilla::DebugOnly<nsresult> rv = GetInt64(idx, &v);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return v;
  }

  inline double AsDouble(uint32_t idx) {
    double v = 0.0;
    mozilla::DebugOnly<nsresult> rv = GetDouble(idx, &v);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return v;
  }

  inline const char* AsSharedUTF8String(uint32_t idx, uint32_t *len) {
    const char *str = nullptr;
    *len = 0;
    mozilla::DebugOnly<nsresult> rv = GetSharedUTF8String(idx, len, &str);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return str;
  }

  inline const char16_t* AsSharedWString(uint32_t idx, uint32_t *len) {
    const char16_t *str = nullptr;
    *len = 0;
    mozilla::DebugOnly<nsresult> rv = GetSharedString(idx, len, &str);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return str;
  }

  inline const uint8_t* AsSharedBlob(uint32_t idx, uint32_t *len) {
    const uint8_t *blob = nullptr;
    *len = 0;
    mozilla::DebugOnly<nsresult> rv = GetSharedBlob(idx, len, &blob);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return blob;
  }

  inline bool IsNull(uint32_t idx) {
    bool b = false;
    mozilla::DebugOnly<nsresult> rv = GetIsNull(idx, &b);
    MOZ_ASSERT(NS_SUCCEEDED(rv),
               "Getting value failed, wrong column index?");
    return b;
  }

%}

};