Examples of org.teiid.metadata.FunctionParameter

org.teiid.metadata.FunctionParameter
A function parameter defines the name and description of an input or output parameter for a function. The name should not be null, but that is not verified by this class. Validation of this object can be done with the {@link FunctionMetadataValidator}. The type string used in the function parameter should be one of the standard type names defined in {@link org.teiid.core.types.DataTypeManager.DefaultDataTypes}.


    private void addTranslateFunction() {
        functions.add(
            new FunctionMethod(SourceSystemFunctions.TRANSLATE, QueryPlugin.Util.getString("SystemSource.Translate_desc"), STRING, FUNCTION_CLASS, "translate", //$NON-NLS-1$ //$NON-NLS-2$ 
                new FunctionParameter[] {
                    new FunctionParameter("string", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Translate_arg1")), //$NON-NLS-1$ //$NON-NLS-2$
                    new FunctionParameter("source", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Translate_arg2")), //$NON-NLS-1$ //$NON-NLS-2$
                    new FunctionParameter("destination", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Translate_arg3")) }, //$NON-NLS-1$ //$NON-NLS-2$
                new FunctionParameter("result", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Translate_result")) ) ); //$NON-NLS-1$ //$NON-NLS-2$
    }

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    private void addTypedConversionFunction(String name, String sourceType) {
        functions.add(
            new FunctionMethod(name, QueryPlugin.Util.getString("SystemSource.Convert_desc", sourceType), CONVERSION, FUNCTION_CLASS, "convert", //$NON-NLS-1$ //$NON-NLS-2$ 
                new FunctionParameter[] {
                    new FunctionParameter("value", sourceType, QueryPlugin.Util.getString("SystemSource.Convert_arg1")), //$NON-NLS-1$ //$NON-NLS-2$
                    new FunctionParameter("target", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Convert_arg2")) }, //$NON-NLS-1$ //$NON-NLS-2$
                new FunctionParameter("result", DataTypeManager.DefaultDataTypes.OBJECT, QueryPlugin.Util.getString("SystemSource.Convert_result")) ) );                 //$NON-NLS-1$ //$NON-NLS-2$
    
    }

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    private void addTypedContextFunction(String contextType, String exprType) {
        functions.add(
            new FunctionMethod("context", QueryPlugin.Util.getString("SystemSource.Context_desc"), MISCELLANEOUS, FUNCTION_CLASS, "context", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                new FunctionParameter[] {
                    new FunctionParameter("context", contextType, QueryPlugin.Util.getString("SystemSource.Context_arg1")), //$NON-NLS-1$ //$NON-NLS-2$
                    new FunctionParameter("element", exprType, QueryPlugin.Util.getString("SystemSource.Context_arg2")) }, //$NON-NLS-1$ //$NON-NLS-2$
                new FunctionParameter("result", exprType, QueryPlugin.Util.getString("SystemSource.Context_result")) ) );                     //$NON-NLS-1$ //$NON-NLS-2$
    }

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    private void addRowLimitFunctions() {
      for (String exprType : DataTypeManager.getAllDataTypeNames()) {
            functions.add(
                    new FunctionMethod("rowlimit", QueryPlugin.Util.getString("SystemSource.Rowlimit_desc"), MISCELLANEOUS, FUNCTION_CLASS, "rowlimit", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                        new FunctionParameter[] {
                            new FunctionParameter("element", exprType, QueryPlugin.Util.getString("SystemSource.Rowlimit_arg1")) }, //$NON-NLS-1$ //$NON-NLS-2$
                        new FunctionParameter("result", DataTypeManager.DefaultDataTypes.INTEGER, QueryPlugin.Util.getString("SystemSource.Rowlimit_result")) ) );                     //$NON-NLS-1$ //$NON-NLS-2$
      }
    }

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    private void addRowLimitExceptionFunctions() {
      for (String exprType : DataTypeManager.getAllDataTypeNames()) {
            functions.add(
                    new FunctionMethod("rowlimitexception", QueryPlugin.Util.getString("SystemSource.RowlimitException_desc"), MISCELLANEOUS, FUNCTION_CLASS, "rowlimitexception", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                        new FunctionParameter[] {
                            new FunctionParameter("element", exprType, QueryPlugin.Util.getString("SystemSource.Rowlimit_arg1")) }, //$NON-NLS-1$ //$NON-NLS-2$
                        new FunctionParameter("result", DataTypeManager.DefaultDataTypes.INTEGER, QueryPlugin.Util.getString("SystemSource.Rowlimit_result")) ) );                     //$NON-NLS-1$ //$NON-NLS-2$
      }
    }

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    private void addDecodeFunction(String functionName, String resultType) {
        functions.add(
            new FunctionMethod(functionName, QueryPlugin.Util.getString("SystemSource.Decode1_desc"), MISCELLANEOUS, PushDown.SYNTHETIC, null, null, //$NON-NLS-1$
                new FunctionParameter[] { 
                    new FunctionParameter("input", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Decode1_arg1")), //$NON-NLS-1$ //$NON-NLS-2$
                    new FunctionParameter("decodeString", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Decode1_arg2")) }, //$NON-NLS-1$ //$NON-NLS-2$
                new FunctionParameter("result", resultType, QueryPlugin.Util.getString("SystemSource.Decode1_result") ) ) );    //$NON-NLS-1$ //$NON-NLS-2$
                     
        functions.add(
            new FunctionMethod(functionName, QueryPlugin.Util.getString("SystemSource.Decode2_desc"), MISCELLANEOUS, PushDown.SYNTHETIC, null, null, //$NON-NLS-1$
                new FunctionParameter[] { 
                    new FunctionParameter("input", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Decode2_arg1")), //$NON-NLS-1$ //$NON-NLS-2$
                    new FunctionParameter("decodeString", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Decode2_arg2")), //$NON-NLS-1$ //$NON-NLS-2$
                    new FunctionParameter("delimiter", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Decode2_arg3")) }, //$NON-NLS-1$ //$NON-NLS-2$
                new FunctionParameter("result", resultType, QueryPlugin.Util.getString("SystemSource.Decode2_result") ) ) );    //$NON-NLS-1$ //$NON-NLS-2$


    }

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    private void addLookupFunctions() {
      for (String keyValueType : DataTypeManager.getAllDataTypeNames()) {
            functions.add(
                    new FunctionMethod("lookup", QueryPlugin.Util.getString("SystemSource.Lookup_desc"), MISCELLANEOUS, PushDown.CANNOT_PUSHDOWN, FUNCTION_CLASS, "lookup", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                        new FunctionParameter[] {
                            new FunctionParameter("codetable", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Lookup_arg1")), //$NON-NLS-1$ //$NON-NLS-2$
                            new FunctionParameter("returnelement", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Lookup_arg2")), //$NON-NLS-1$ //$NON-NLS-2$
                            new FunctionParameter("keyelement", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Lookup_arg3")), //$NON-NLS-1$ //$NON-NLS-2$
                            new FunctionParameter("keyvalue", keyValueType, QueryPlugin.Util.getString("SystemSource.Lookup_arg4")), //$NON-NLS-1$ //$NON-NLS-2$
                             },
                        new FunctionParameter("result", DataTypeManager.DefaultDataTypes.OBJECT, QueryPlugin.Util.getString("SystemSource.Lookup_result")), true, Determinism.VDB_DETERMINISTIC ) );                     //$NON-NLS-1$ //$NON-NLS-2$
      }
    }

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    }


    private void addUserFunction() {
        functions.add(
            new FunctionMethod("user", QueryPlugin.Util.getString("SystemSource.User_desc"), MISCELLANEOUS, PushDown.CANNOT_PUSHDOWN, FUNCTION_CLASS, "user", null, //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                new FunctionParameter("result", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.User_result")), false, Determinism.USER_DETERMINISTIC) );                     //$NON-NLS-1$ //$NON-NLS-2$
    }

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    }
    
    private void addCurrentDatabaseFunction() {
        functions.add(
            new FunctionMethod("current_database", QueryPlugin.Util.getString("SystemSource.current_database_desc"), MISCELLANEOUS, PushDown.CANNOT_PUSHDOWN, FUNCTION_CLASS, "current_database", null, //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                new FunctionParameter("result", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("current_database_result")), false, Determinism.VDB_DETERMINISTIC) );                     //$NON-NLS-1$ //$NON-NLS-2$
    }

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    private void addEnvFunction() {
        functions.add(
            new FunctionMethod("env", QueryPlugin.Util.getString("SystemSource.Env_desc"), MISCELLANEOUS, PushDown.CANNOT_PUSHDOWN, FUNCTION_CLASS, "env", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                new FunctionParameter[] {
                    new FunctionParameter("variablename", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Env_varname")) //$NON-NLS-1$ //$NON-NLS-2$
                     },
                new FunctionParameter("result", DataTypeManager.DefaultDataTypes.STRING, QueryPlugin.Util.getString("SystemSource.Env_result")), false, Determinism.SESSION_DETERMINISTIC ) );                     //$NON-NLS-1$ //$NON-NLS-2$
    }

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