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@title OracleBase\n * @dev Lays out generic single-event oracle functionality. It implements \n * an internal function to set the result that can be called by public\n * functions that extend OracleBase.\n */\n \ncontract OracleBase is IOracle {\n\n bytes result;\n bool resultIsSet;\n\n event ResultSet(bytes _result, address _sender);\n\n /**\n * Public functions\n */\n\n /**\n * @dev Returns the result or reverts if it hasn't been set\n * @param id This is not used in single-event oracles and should be 0\n * @return The result or the oracle's single event\n */\n function resultFor(bytes32 id) external view returns (bytes) {\n require(id == bytes32(0), \"This oracle does not support ids.\");\n require(isResultSet(id), \"The result has not been set.\");\n return result;\n }\n\n /**\n * @dev Checks if the result has been set\n * @return True if the result has been set\n */\n function isResultSet(bytes32 /*id*/) public view returns (bool) {\n return resultIsSet;\n }\n\n /**\n * Internal functions\n */\n\n /**\n * @dev Set's the result, emits ResultSet, and calls the _resultWasSet()\n * overridable function\n * @param _result The result of the oracle's single event.\n */\n function _setResult(bytes _result) internal {\n require(!resultIsSet, \"Result has already been set.\");\n result = _result;\n resultIsSet = true;\n emit ResultSet(_result, msg.sender);\n _resultWasSet(_result);\n }\n\n /**\n * @dev Empty function meant to be overidden in subclasses\n */\n function _resultWasSet(bytes /*_result*/) internal {\n // optional override\n }\n\n}\n", "sourcePath": "/Users/mfcalvanese/dev/eth/tidbit-eth/contracts/Oracles/OracleBase.sol", "ast": { "absolutePath": "/Users/mfcalvanese/dev/eth/tidbit-eth/contracts/Oracles/OracleBase.sol", "exportedSymbols": { "OracleBase": [ 734 ] }, "id": 735, "nodeType": "SourceUnit", "nodes": [ { "id": 648, "literals": [ "solidity", "^", "0.4", ".24" ], "nodeType": "PragmaDirective", "src": "0:24:15" }, { "absolutePath": "/Users/mfcalvanese/dev/eth/tidbit-eth/contracts/Oracles/IOracle.sol", "file": "./IOracle.sol", "id": 649, "nodeType": "ImportDirective", "scope": 735, "sourceUnit": 274, "src": "26:23:15", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 650, "name": "IOracle", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 273, "src": "288:7:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IOracle_$273", "typeString": "contract IOracle" } }, "id": 651, "nodeType": "InheritanceSpecifier", "src": "288:7:15" } ], "contractDependencies": [ 273 ], "contractKind": "contract", "documentation": "@title OracleBase\n@dev Lays out generic single-event oracle functionality. 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