C# Function.AddElement方法代码示例

		protected virtual void GenerateGetNextInstanceMethodCode(Function getNextInstanceMethod)
		{
			getNextInstanceMethod.AddCodeFormat("LWIP_UNUSED_ARG({0});", getNextInstanceMethod.Parameter[0].Name);
			getNextInstanceMethod.AddCodeFormat("LWIP_UNUSED_ARG({0});", getNextInstanceMethod.Parameter[1].Name);
			getNextInstanceMethod.AddCodeFormat("LWIP_UNUSED_ARG({0});", getNextInstanceMethod.Parameter[2].Name);

			VariableDeclaration returnValue = new VariableDeclaration((VariableType)getNextInstanceMethod.ReturnType.Clone(), LwipDefs.Def_ErrorCode_NoSuchInstance);
			returnValue.Type.Name = "err";
			getNextInstanceMethod.Declarations.Add(returnValue);

			StringBuilder indexColumns = new StringBuilder();
			foreach (SnmpScalarNode indexNode in this.indexNodes)
			{
				indexColumns.AppendFormat(
					" {0} ({1}, OID length = {2})\n",
					indexNode.Name,
					indexNode.DataType,
					(indexNode.OidRepresentationLen >= 0) ? indexNode.OidRepresentationLen.ToString() : "variable");
			}
			if (indexColumns.Length > 0)
			{
				indexColumns.Length--;

				getNextInstanceMethod.Declarations.Insert(0, new Comment(String.Format(
					"The instance OID of this table consists of following (index) column(s):\n{0}",
					indexColumns)));
			}

			string augmentsHint = "";
			if (!String.IsNullOrWhiteSpace(this.augmentedTableRow))
			{
				augmentsHint = String.Format(
					"This table augments table '{0}'! Index columns therefore belong to table '{0}'!\n" + 
					"You may simply call the '*{1}' method of this table.\n\n",
					(this.augmentedTableRow.ToLowerInvariant().EndsWith("entry")) ? this.augmentedTableRow.Substring(0, this.augmentedTableRow.Length-5) : this.augmentedTableRow,
					LwipDefs.FnctSuffix_GetNextInstance);
			}

			getNextInstanceMethod.AddElement(new Comment(String.Format(
				"TODO: analyze '{0}->id'/'{0}->len' and return the subsequent row instance\n" +
				"Be aware that '{0}->id'/'{0}->len' must not point to a valid instance or have correct instance length.\n" +
				"If '{0}->len' is 0, return the first instance. If '{0}->len' is longer than expected, cut superfluous OID parts.\n" +
				"If a valid next instance is found, store it in '{0}->id'/'{0}->len' and set '{1} = {2};'\n\n" + 
				"snmp_oid_* methods may be used for easier processing of oid\n\n" + 
				"{3}" + 
				"In order to avoid decoding OID a second time in subsequent get_value/set_test/set_value methods,\n" +
				"you may store an arbitrary value (like a pointer to target value object) in '{4}->reference'/'{4}->reference_len'.\n" +
				"But be aware that not always a subsequent method is called -> Do NOT allocate memory here and try to release it in subsequent methods!\n\n" +
				"You also may replace function pointers in '{4}' param for get/test/set methods which contain the default values from table definition,\n" +
				"in order to provide special methods, for the currently processed cell. Changed pointers are only valid for current request.",
				getNextInstanceMethod.Parameter[1].Name,
				returnValue.Type.Name,
				LwipDefs.Def_ErrorCode_Ok,
				augmentsHint,
				getNextInstanceMethod.Parameter[2].Name
				)));

			getNextInstanceMethod.AddElement(new Comment(String.Format(
				"For easier processing and getting the next instance, you may use the 'snmp_next_oid_*' enumerator.\n" +
				"Simply pass all known instance OID's to it and it returns the next valid one:\n\n" +
				"{0} state;\n" +
				"{1} result_buf;\n" +
				"snmp_next_oid_init(&state, {2}->id, {2}->len, result_buf, LWIP_SNMP_OBJ_ID_LEN);\n" + 
				"while ({{not all instances passed}}) {{\n" + 
				"  {1} test_oid;\n" + 
				"  {{fill test_oid to create instance oid for next instance}}\n" + 
				"  snmp_next_oid_check(&state, test_oid->id, test_oid->len, {{target_data_ptr}});\n" + 
				"}}\n" + 
				"if(state.status == SNMP_NEXT_OID_STATUS_SUCCESS) {{\n" + 
				"  snmp_oid_assign(row_oid, result_buf->oid, result_buf->len);\n" +
				"  {3}->reference.ptr = state.reference; //==target_data_ptr, for usage in subsequent get/test/set\n" + 
				"  {4} = {5};\n" + 
				"}}"
				,
				LwipDefs.Vt_StNextOidState,
				LwipDefs.Vt_StObjectId,
				getNextInstanceMethod.Parameter[1].Name,
				getNextInstanceMethod.Parameter[2].Name,
				returnValue.Type.Name,
				LwipDefs.Def_ErrorCode_Ok
				)));

			getNextInstanceMethod.AddCodeFormat("return {0};", returnValue.Type.Name);
		}

		protected virtual void GenerateGetInstanceMethodCode(Function getInstanceMethod)
		{
			VariableDeclaration returnValue = new VariableDeclaration((VariableType)getInstanceMethod.ReturnType.Clone(), LwipDefs.Def_ErrorCode_NoSuchInstance);
			returnValue.Type.Name = "err";
			getInstanceMethod.Declarations.Add(returnValue);

			int instanceOidLength = 0;
			StringBuilder indexColumns = new StringBuilder();
			foreach (SnmpScalarNode indexNode in this.indexNodes)
			{
				if (instanceOidLength >= 0)
				{
					if (indexNode.OidRepresentationLen >= 0)
					{
						instanceOidLength += indexNode.OidRepresentationLen;
					}
					else
					{
						// at least one index column has a variable length -> we cannot perform a static check
						instanceOidLength = -1;
					}
				}

				indexColumns.AppendFormat(
					" {0} ({1}, OID length = {2})\n",
					indexNode.Name,
					indexNode.DataType,
					(indexNode.OidRepresentationLen >= 0) ? indexNode.OidRepresentationLen.ToString() : "variable");
			}
			if (indexColumns.Length > 0)
			{
				indexColumns.Length--;

				getInstanceMethod.Declarations.Insert(0, new Comment(String.Format(
					"The instance OID of this table consists of following (index) column(s):\n{0}",
					indexColumns)));
			}

			string augmentsHint = "";
			if (!String.IsNullOrWhiteSpace(this.augmentedTableRow))
			{
				augmentsHint = String.Format(
					"This table augments table '{0}'! Index columns therefore belong to table '{0}'!\n" + 
					"You may simply call the '*{1}' method of this table.\n\n",
					(this.augmentedTableRow.ToLowerInvariant().EndsWith("entry")) ? this.augmentedTableRow.Substring(0, this.augmentedTableRow.Length-5) : this.augmentedTableRow,
					LwipDefs.FnctSuffix_GetInstance);
			}

			CodeContainerBase ccb = getInstanceMethod;
			if (instanceOidLength > 0)
			{
				IfThenElse ite = new IfThenElse(String.Format("{0} == {1}", getInstanceMethod.Parameter[2].Name, instanceOidLength));
				getInstanceMethod.AddElement(ite);
				ccb = ite;
			}

			ccb.AddCodeFormat("LWIP_UNUSED_ARG({0});", getInstanceMethod.Parameter[0].Name);
			ccb.AddCodeFormat("LWIP_UNUSED_ARG({0});", getInstanceMethod.Parameter[1].Name);
			if (instanceOidLength <= 0)
			{
				ccb.AddCodeFormat("LWIP_UNUSED_ARG({0});", getInstanceMethod.Parameter[2].Name);
			}
			ccb.AddCodeFormat("LWIP_UNUSED_ARG({0});", getInstanceMethod.Parameter[3].Name);

			ccb.AddElement(new Comment(String.Format(
				"TODO: check if '{0}'/'{1}' params contain a valid instance oid for a row\n" +
				"If so, set '{2} = {3};'\n\n" + 
				"snmp_oid_* methods may be used for easier processing of oid\n\n" + 
				"{4}" + 
				"In order to avoid decoding OID a second time in subsequent get_value/set_test/set_value methods,\n" +
				"you may store an arbitrary value (like a pointer to target value object) in '{5}->reference'/'{5}->reference_len'.\n" +
				"But be aware that not always a subsequent method is called -> Do NOT allocate memory here and try to release it in subsequent methods!\n\n" +
				"You also may replace function pointers in '{5}' param for get/test/set methods which contain the default values from table definition,\n" +
				"in order to provide special methods, for the currently processed cell. Changed pointers are only valid for current request.",
				getInstanceMethod.Parameter[1].Name,
				getInstanceMethod.Parameter[2].Name,
				returnValue.Type.Name,
				LwipDefs.Def_ErrorCode_Ok,
				augmentsHint,
				getInstanceMethod.Parameter[3].Name
				)));

			getInstanceMethod.AddCodeFormat("return {0};", returnValue.Type.Name);
		}