java.lang.Object
com.thetransactioncompany.jsonrpc2.util.ParamsRetriever
com.thetransactioncompany.jsonrpc2.util.PositionalParamsRetriever
public class PositionalParamsRetrieverextends ParamsRetriever
Utility class for retrieving JSON-RPC 2.0 positional parameters (packed into a JSON Array).

Provides a set of getter methods according to the expected parameter type (number, string, etc.) and whether the parameter is mandatory or optional:

  • getXXX(param_pos) for mandatory parameters, where XXX is the expected parameter type.
  • getOptXXX(param_pos, default_value) for optional parameters, specifying a default value.

There are also generic getter methods that let you do the type conversion yourself.

If a parameter cannot be retrieved, e.g. due to a missing mandatory parameter or bad type, a JSONRPC2Error.INVALID_PARAMS exception is thrown.

Example: suppose you have a method with 3 positional parameters where the first two are mandatory and the last is optional and has a default value of true.

// Parse received request string
JSONRPC2Request request = null;

try {
        request = JSONRPC2Request.parse(jsonString);
} catch (JSONRPC2ParseException e) {
        // handle exception...
}

// Create a new retriever for positional parameters
List params = (List)request.getParams();
PositionalParamsRetriever r = new PositionalParamsRetriever(params);

try {
        // Extract first mandatory string parameter
        String param1 = r.getString(0);

        // Extract second integer parameter
        int param2 = r.getInt(1);

        // Extract third optional boolean parameter which defaults to true
        boolean param3 = r.getOptBoolean(2, true);

} catch (JSONRPC2Error e) {
        // A JSONRPC2Error.INVALID_PARAMS will be thrown to indicate
        // an unexpected parameter type or a missing mandatory parameter.
        // You can use it straight away to create the appropriate
        // JSON-RPC 2.0 error response.
        JSONRPC2Response response = new JSONRPC2Response(e, null);
}

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private List<Object>
    params
    The positional parameters interface.

  • Constructor Summary

    Constructors
    Constructor
    Description
    PositionalParamsRetriever(List<Object> params)
    Creates a new positional parameters retriever from the specified value list.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    ensureParam(int position)
    Throws a JSONRPC2Error.INVALID_PARAMS exception if there is no parameter at the specified position.
    <T> void
    ensureParam(int position, Class<T> clazz)
    Throws a JSONRPC2Error.INVALID_PARAMS exception if there is no parameter at the specified position, its value is null, or its type doesn't map to the specified.
    <T> void
    ensureParam(int position, Class<T> clazz, boolean allowNull)
    Throws a JSONRPC2Error.INVALID_PARAMS exception if there is no parameter at the specified position or its type doesn't map to the specified.
    Object
    get(int position)
    Retrieves the specified parameter which can be of any type.
    <T> T
    get(int position, Class<T> clazz)
    Retrieves the specified parameter which must map to the provided class (use the appropriate wrapper class for primitive types).
    <T> T
    get(int position, Class<T> clazz, boolean allowNull)
    Retrieves the specified parameter which must map to the provided class (use the appropriate wrapper class for primitive types).
    boolean
    getBoolean(int position)
    Retrieves the specified boolean (maps from JSON true/false) parameter.
    double
    getDouble(int position)
    Retrieves the specified numeric parameter as a double.
    <T extends Enum<T>>
    T
    getEnum(int position, Class<T> enumClass)
    Retrieves the specified enumerated parameter (from a JSON string that has a predefined set of possible values).
    <T extends Enum<T>>
    T
    getEnum(int position, Class<T> enumClass, boolean ignoreCase)
    Retrieves the specified enumerated parameter (from a JSON string that has a predefined set of possible values), allowing for a case insensitive match.
    String
    getEnumString(int position, String[] enumStrings)
    Retrieves the specified enumerated string parameter.
    String
    getEnumString(int position, String[] enumStrings, boolean ignoreCase)
    Retrieves the specified enumerated string parameter, allowing for a case insensitive match.
    float
    getFloat(int position)
    Retrieves the specified numeric parameter as a float.
    int
    getInt(int position)
    Retrieves the specified numeric parameter as an int.
    List<Object>
    getList(int position)
    Retrieves the specified list (maps from JSON array) parameter.
    List<Object>
    getList(int position, boolean allowNull)
    Retrieves the specified list (maps from JSON array) parameter.
    long
    getLong(int position)
    Retrieves the specified numeric parameter as a long.
    Map<String,Object>
    getMap(int position)
    Retrieves the specified map (maps from JSON object) parameter.
    Map<String,Object>
    getMap(int position, boolean allowNull)
    Retrieves the specified map (maps from JSON object) parameter.
    <T> T
    getOpt(int position, Class<T> clazz, boolean allowNull, T defaultValue)
    Retrieves the specified optional parameter which must map to the provided class (use the appropriate wrapper class for primitive types).
    <T> T
    getOpt(int position, Class<T> clazz, T defaultValue)
    Retrieves the specified optional parameter which must map to the provided class (use the appropriate wrapper class for primitive types).
    boolean
    getOptBoolean(int position, boolean defaultValue)
    Retrieves the specified optional boolean (maps from JSON true/false) parameter.
    double
    getOptDouble(int position, double defaultValue)
    Retrieves the specified optional numeric parameter as a double.
    <T extends Enum<T>>
    T
    getOptEnum(int position, Class<T> enumClass, String defaultValue)
    Retrieves the specified optional enumerated parameter (from a JSON string that has a predefined set of possible values).
    <T extends Enum<T>>
    T
    getOptEnum(int position, Class<T> enumClass, String defaultValue, boolean ignoreCase)
    Retrieves the specified optional enumerated parameter (from a JSON string that has a predefined set of possible values), allowing for a case insensitive match.
    String
    getOptEnumString(int position, String[] enumStrings, String defaultValue)
    Retrieves the specified optional enumerated string parameter.
    String
    getOptEnumString(int position, String[] enumStrings, String defaultValue, boolean ignoreCase)
    Retrieves the specified optional enumerated string parameter, allowing for a case insensitive match.
    float
    getOptFloat(int position, float defaultValue)
    Retrieves the specified optional numeric parameter as a float.
    int
    getOptInt(int position, int defaultValue)
    Retrieves the specified optional numeric parameter as an int.
    List<Object>
    getOptList(int position, boolean allowNull, List<Object> defaultValue)
    Retrieves the specified optional list (maps from JSON array) parameter.
    List<Object>
    getOptList(int position, List<Object> defaultValue)
    Retrieves the specified optional list (maps from JSON array) parameter.
    long
    getOptLong(int position, long defaultValue)
    Retrieves the specified optional numeric parameter as a long.
    Map<String,Object>
    getOptMap(int position, boolean allowNull, Map<String,Object> defaultValue)
    Retrieves the specified optional map (maps from JSON object) parameter.
    Map<String,Object>
    getOptMap(int position, Map<String,Object> defaultValue)
    Retrieves the specified optional map (maps from JSON object) parameter.
    String
    getOptString(int position, boolean allowNull, String defaultValue)
    Retrieves the specified optional string parameter.
    String
    getOptString(int position, String defaultValue)
    Retrieves the specified optional string parameter.
    String[]
    getOptStringArray(int position, boolean allowNull, String[] defaultValue)
    Retrieves the specified optional string array (maps from JSON array of strings) parameter.
    String[]
    getOptStringArray(int position, String[] defaultValue)
    Retrieves the specified optional string array (maps from JSON array of strings) parameter.
    List<Object>
    getParams()
    Gets the positional parameters for this retriever.
    String
    getString(int position)
    Retrieves the specified string parameter.
    String
    getString(int position, boolean allowNull)
    Retrieves the specified string parameter.
    String[]
    getStringArray(int position)
    Retrieves the specified string array (maps from JSON array of strings) parameter.
    String[]
    getStringArray(int position, boolean allowNull)
    Retrieves the specified string array (maps from JSON array of strings) parameter.
    boolean
    hasParam(int position)
    Returns true a parameter at the specified position exists, else false.
    private static JSONRPC2Error
    newArrayException(int position)
    Creates a JSON-RPC 2.0 error indicating an array exception.
    private static JSONRPC2Error
    newUnexpectedParameterTypeException(int position)
    Creates a JSON-RPC 2.0 error indicating a positional parameter with an unexpected JSON type.
    int
    size()
    Returns the parameter count.
    private static <T extends Enum<T>>
    void
    throwEnumParameterException(int position, Class<T> enumClass)
    Throws a JSON-RPC 2.0 error indicating a positional parameter with an unexpected enumerated value.
    private static void
    throwEnumParameterException(int position, String[] enumStrings)
    Throws a JSON-RPC 2.0 error indicating a positional parameter with an unexpected enumerated value.
    private static void
    throwMissingParameterException(int position)
    Throws a JSON-RPC 2.0 error indicating a missing positional parameter.
    private static void
    throwNullParameterException(int position)
    Throws a JSON-RPC 2.0 error indicating a positional parameter with unexpected null value.

    Methods inherited from class ParamsRetriever

    getEnumStringMatch, getEnumStringMatch
    Modifier and Type
    Method
    Description
    protected static <T extends Enum<T>>
    T
    getEnumStringMatch(String input, Class<T> enumClass, boolean ignoreCase)
    Matches a string against an enumeration of acceptable values.
    protected static String
    getEnumStringMatch(String input, String[] enumStrings, boolean ignoreCase)
    Matches a string against an array of acceptable values.

    Methods inherited from class Object

    clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • params

      private List<Object> params
      The positional parameters interface.

  • Constructor Details

    • PositionalParamsRetriever

      public PositionalParamsRetriever(List<Object> params)
      Creates a new positional parameters retriever from the specified value list.
      Parameters:
      params - The positional parameters list. Must not be null.

  • Method Details

    • throwMissingParameterException

      private static void throwMissingParameterException(int position) throws JSONRPC2Error
      Throws a JSON-RPC 2.0 error indicating a missing positional parameter.
      Parameters:
      position - The parameter position. Should be non-negative.
      Throws:
      JSONRPC2Error - Formatted JSON-RPC 2.0 error.

    • throwNullParameterException

      private static void throwNullParameterException(int position) throws JSONRPC2Error
      Throws a JSON-RPC 2.0 error indicating a positional parameter with unexpected null value.
      Parameters:
      position - The parameter position. Should be non-negative.
      Throws:
      JSONRPC2Error - Formatted JSON-RPC 2.0 error.

    • throwEnumParameterException

      private static void throwEnumParameterException(int position, String[] enumStrings) throws JSONRPC2Error
      Throws a JSON-RPC 2.0 error indicating a positional parameter with an unexpected enumerated value.
      Parameters:
      position - The parameter position. Should be non-negative.
      enumStrings - The acceptable string values. Must not be null.
      Throws:
      JSONRPC2Error - Formatted JSON-RPC 2.0 error.

    • throwEnumParameterException

      private static <T extends Enum<T>> void throwEnumParameterException(int position, Class<T> enumClass) throws JSONRPC2Error
      Throws a JSON-RPC 2.0 error indicating a positional parameter with an unexpected enumerated value.
      Type Parameters:
      T - The enumeration type.
      Parameters:
      position - The parameter position. Should be non-negative.
      enumClass - The enumeration class specifying the acceptable string values. Must not be null.
      Throws:
      JSONRPC2Error - Formatted JSON-RPC 2.0 error.

    • newUnexpectedParameterTypeException

      private static JSONRPC2Error newUnexpectedParameterTypeException(int position)
      Creates a JSON-RPC 2.0 error indicating a positional parameter with an unexpected JSON type.
      Parameters:
      position - The parameter position. Should be non-negative.
      Returns:
      Formatted JSON-RPC 2.0 error.

    • newArrayException

      private static JSONRPC2Error newArrayException(int position)
      Creates a JSON-RPC 2.0 error indicating an array exception.
      Parameters:
      position - The parameter position. Should be non-negative.
      Returns:
      Formatted JSON-RPC 2.0 error.

    • getParams

      public List<Object> getParams()
      Gets the positional parameters for this retriever.
      Returns:
      The positional parameters.

    • size

      public int size()
      Description copied from class: ParamsRetriever
      Returns the parameter count.
      Specified by:
      size in class ParamsRetriever
      Returns:
      The parameters count.

    • hasParam

      public boolean hasParam(int position)
      Returns true a parameter at the specified position exists, else false.
      Parameters:
      position - The parameter position.
      Returns:
      true if the parameter exists, else false.

    • ensureParam

      public void ensureParam(int position) throws JSONRPC2Error
      Throws a JSONRPC2Error.INVALID_PARAMS exception if there is no parameter at the specified position.

      You may use this method to fire the proper JSON-RPC 2.0 error on a missing mandatory parameter.

      Parameters:
      position - The parameter position, starting with zero for the first.
      Throws:
      JSONRPC2Error - On a missing parameter (JSONRPC2Error.INVALID_PARAMS).

    • ensureParam

      public <T> void ensureParam(int position, Class<T> clazz) throws JSONRPC2Error
      Throws a JSONRPC2Error.INVALID_PARAMS exception if there is no parameter at the specified position, its value is null, or its type doesn't map to the specified.

      You may use this method to fire the proper JSON-RPC 2.0 error on a missing or badly-typed mandatory parameter.

      Type Parameters:
      T - The type the parameter value must map to.
      Parameters:
      position - The parameter position.
      clazz - The corresponding Java class that the parameter should map to (any one of the return types of the getXXX() getter methods. Set to Object.class to allow any type. Must not be null.
      Throws:
      JSONRPC2Error - On a missing parameter, null value or bad type (JSONRPC2Error.INVALID_PARAMS).

    • ensureParam

      public <T> void ensureParam(int position, Class<T> clazz, boolean allowNull) throws JSONRPC2Error
      Throws a JSONRPC2Error.INVALID_PARAMS exception if there is no parameter at the specified position or its type doesn't map to the specified.

      You may use this method to fire the proper JSON-RPC 2.0 error on a missing or badly-typed mandatory parameter.

      Type Parameters:
      T - The type the parameter value must map to.
      Parameters:
      position - The parameter position.
      clazz - The corresponding Java class that the parameter should map to (any one of the return types of the getXXX() getter methods. Set to Object.class to allow any type. Must not be null.
      allowNull - If true allows a null parameter value.
      Throws:
      JSONRPC2Error - On a missing parameter or bad type (JSONRPC2Error.INVALID_PARAMS).

    • get

      public Object get(int position) throws JSONRPC2Error
      Retrieves the specified parameter which can be of any type. Use this generic getter if you want to cast the value yourself. Otherwise look at the typed get* methods.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value.
      Throws:
      JSONRPC2Error - On a missing parameter (JSONRPC2Error.INVALID_PARAMS).

    • get

      public <T> T get(int position, Class<T> clazz) throws JSONRPC2Error
      Retrieves the specified parameter which must map to the provided class (use the appropriate wrapper class for primitive types).
      Type Parameters:
      T - The type the parameter value is expected to map to.
      Parameters:
      position - The parameter position.
      clazz - The corresponding Java class that the parameter should map to (any one of the return types of the getXXX() getter methods. Set to Object.class to allow any type. Must not be null.
      Returns:
      The parameter value.
      Throws:
      JSONRPC2Error - On a missing parameter, null value or bad type (JSONRPC2Error.INVALID_PARAMS).

    • get

      public <T> T get(int position, Class<T> clazz, boolean allowNull) throws JSONRPC2Error
      Retrieves the specified parameter which must map to the provided class (use the appropriate wrapper class for primitive types).
      Type Parameters:
      T - The type the parameter value is expected to map to.
      Parameters:
      position - The parameter position.
      clazz - The corresponding Java class that the parameter should map to (any one of the return types of the getXXX() getter methods. Set to Object.class to allow any type. Must not be null.
      allowNull - If true allows a null parameter value.
      Returns:
      The parameter value.
      Throws:
      JSONRPC2Error - On a missing parameter or bad type (JSONRPC2Error.INVALID_PARAMS).

    • getOpt

      public <T> T getOpt(int position, Class<T> clazz, T defaultValue) throws JSONRPC2Error
      Retrieves the specified optional parameter which must map to the provided class (use the appropriate wrapper class for primitive types). If the parameter doesn't exist the method returns the specified default value.
      Type Parameters:
      T - The type the parameter value is expected to map to.
      Parameters:
      position - The parameter position.
      clazz - The corresponding Java class that the parameter should map to (any one of the return types of the getXXX() getter methods. Set to Object.class to allow any type. Must not be null.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOpt

      public <T> T getOpt(int position, Class<T> clazz, boolean allowNull, T defaultValue) throws JSONRPC2Error
      Retrieves the specified optional parameter which must map to the provided class (use the appropriate wrapper class for primitive types). If the parameter doesn't exist the method returns the specified default value.
      Type Parameters:
      T - The type the parameter value is expected to map to.
      Parameters:
      position - The parameter position.
      clazz - The corresponding Java class that the parameter should map to (any one of the return types of the getXXX() getter methods. Set to Object.class to allow any type. Must not be null.
      allowNull - If true allows a null parameter value.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value.
      Throws:
      JSONRPC2Error - On a bad parameter type (JSONRPC2Error.INVALID_PARAMS).

    • getString

      public String getString(int position) throws JSONRPC2Error
      Retrieves the specified string parameter.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a string.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getString

      public String getString(int position, boolean allowNull) throws JSONRPC2Error
      Retrieves the specified string parameter.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      Returns:
      The parameter value as a string.
      Throws:
      JSONRPC2Error - On a missing parameter or bad type (JSONRPC2Error.INVALID_PARAMS).

    • getOptString

      public String getOptString(int position, String defaultValue) throws JSONRPC2Error
      Retrieves the specified optional string parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a string.
      Throws:
      JSONRPC2Error - On a bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptString

      public String getOptString(int position, boolean allowNull, String defaultValue) throws JSONRPC2Error
      Retrieves the specified optional string parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a string.
      Throws:
      JSONRPC2Error - On a bad type (JSONRPC2Error.INVALID_PARAMS).

    • getEnumString

      public String getEnumString(int position, String[] enumStrings) throws JSONRPC2Error
      Retrieves the specified enumerated string parameter.
      Parameters:
      position - The parameter position.
      enumStrings - The acceptable string values. Must not be null.
      Returns:
      The parameter value as a string.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getEnumString

      public String getEnumString(int position, String[] enumStrings, boolean ignoreCase) throws JSONRPC2Error
      Retrieves the specified enumerated string parameter, allowing for a case insensitive match.
      Parameters:
      position - The parameter position.
      enumStrings - The acceptable string values. Must not be null.
      ignoreCase - true for a case insensitive match.
      Returns:
      The matching parameter value as a string.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getOptEnumString

      public String getOptEnumString(int position, String[] enumStrings, String defaultValue) throws JSONRPC2Error
      Retrieves the specified optional enumerated string parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      enumStrings - The acceptable string values. Must not be null.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a string.
      Throws:
      JSONRPC2Error - On a bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getOptEnumString

      public String getOptEnumString(int position, String[] enumStrings, String defaultValue, boolean ignoreCase) throws JSONRPC2Error
      Retrieves the specified optional enumerated string parameter, allowing for a case insensitive match. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      enumStrings - The acceptable string values. Must not be null.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      ignoreCase - true for a case insensitive match.
      Returns:
      The parameter value as a string.
      Throws:
      JSONRPC2Error - On a bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getEnum

      public <T extends Enum<T>> T getEnum(int position, Class<T> enumClass) throws JSONRPC2Error
      Retrieves the specified enumerated parameter (from a JSON string that has a predefined set of possible values).
      Type Parameters:
      T - The enumeration type that the constant names are resolved in.
      Parameters:
      position - The parameter position.
      enumClass - An enumeration type with constant names representing the acceptable string values. Must not be null.
      Returns:
      The matching enumeration constant.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getEnum

      public <T extends Enum<T>> T getEnum(int position, Class<T> enumClass, boolean ignoreCase) throws JSONRPC2Error
      Retrieves the specified enumerated parameter (from a JSON string that has a predefined set of possible values), allowing for a case insensitive match.
      Type Parameters:
      T - The enumeration type that the constant names are resolved in.
      Parameters:
      position - The parameter position.
      enumClass - An enumeration type with constant names representing the acceptable string values. Must not be null.
      ignoreCase - If true a case insensitive match against the acceptable constant names is performed.
      Returns:
      The matching enumeration constant.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getOptEnum

      public <T extends Enum<T>> T getOptEnum(int position, Class<T> enumClass, String defaultValue) throws JSONRPC2Error
      Retrieves the specified optional enumerated parameter (from a JSON string that has a predefined set of possible values). If it doesn't exist the method will return the specified default value.
      Type Parameters:
      T - The enumeration type that the constant names are resolved in.
      Parameters:
      position - The parameter position.
      enumClass - An enumeration type with constant names representing the acceptable string values. Must not be null.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The matching enumeration constant.
      Throws:
      JSONRPC2Error - On a bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getOptEnum

      public <T extends Enum<T>> T getOptEnum(int position, Class<T> enumClass, String defaultValue, boolean ignoreCase) throws JSONRPC2Error
      Retrieves the specified optional enumerated parameter (from a JSON string that has a predefined set of possible values), allowing for a case insensitive match. If it doesn't exist the method will return the specified default value.
      Type Parameters:
      T - The enumeration type that the constant names are resolved in.
      Parameters:
      position - The parameter position.
      enumClass - An enumeration type with constant names representing the acceptable string values. Must not be null.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      ignoreCase - If true a case insensitive match against the acceptable constant names is performed.
      Returns:
      The matching enumeration constant.
      Throws:
      JSONRPC2Error - On a bad type or bad enumeration value (JSONRPC2Error.INVALID_PARAMS).

    • getBoolean

      public boolean getBoolean(int position) throws JSONRPC2Error
      Retrieves the specified boolean (maps from JSON true/false) parameter.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a boolean.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptBoolean

      public boolean getOptBoolean(int position, boolean defaultValue) throws JSONRPC2Error
      Retrieves the specified optional boolean (maps from JSON true/false) parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist.
      Returns:
      The parameter value as a boolean.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getInt

      public int getInt(int position) throws JSONRPC2Error
      Retrieves the specified numeric parameter as an int.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as an int.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptInt

      public int getOptInt(int position, int defaultValue) throws JSONRPC2Error
      Retrieves the specified optional numeric parameter as an int. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist.
      Returns:
      The parameter value as an int.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getLong

      public long getLong(int position) throws JSONRPC2Error
      Retrieves the specified numeric parameter as a long.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a long.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptLong

      public long getOptLong(int position, long defaultValue) throws JSONRPC2Error
      Retrieves the specified optional numeric parameter as a long. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist.
      Returns:
      The parameter value as a long.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getFloat

      public float getFloat(int position) throws JSONRPC2Error
      Retrieves the specified numeric parameter as a float.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a float.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptFloat

      public float getOptFloat(int position, float defaultValue) throws JSONRPC2Error
      Retrieves the specified optional numeric parameter as a float. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist.
      Returns:
      The parameter value as a float.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getDouble

      public double getDouble(int position) throws JSONRPC2Error
      Retrieves the specified numeric parameter as a double.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a double.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptDouble

      public double getOptDouble(int position, double defaultValue) throws JSONRPC2Error
      Retrieves the specified optional numeric parameter as a double. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist.
      Returns:
      The parameter value as a double.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getList

      public List<Object> getList(int position) throws JSONRPC2Error
      Retrieves the specified list (maps from JSON array) parameter.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a list.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getList

      public List<Object> getList(int position, boolean allowNull) throws JSONRPC2Error
      Retrieves the specified list (maps from JSON array) parameter.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      Returns:
      The parameter value as a list.
      Throws:
      JSONRPC2Error - On a missing parameter or bad type (JSONRPC2Error.INVALID_PARAMS).

    • getOptList

      public List<Object> getOptList(int position, List<Object> defaultValue) throws JSONRPC2Error
      Retrieves the specified optional list (maps from JSON array) parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a list.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptList

      public List<Object> getOptList(int position, boolean allowNull, List<Object> defaultValue) throws JSONRPC2Error
      Retrieves the specified optional list (maps from JSON array) parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a list.
      Throws:
      JSONRPC2Error - On a bad parameter type (JSONRPC2Error.INVALID_PARAMS).

    • getStringArray

      public String[] getStringArray(int position) throws JSONRPC2Error
      Retrieves the specified string array (maps from JSON array of strings) parameter.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a string array.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getStringArray

      public String[] getStringArray(int position, boolean allowNull) throws JSONRPC2Error
      Retrieves the specified string array (maps from JSON array of strings) parameter.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      Returns:
      The parameter value as a string array.
      Throws:
      JSONRPC2Error - On a missing parameter or bad type (JSONRPC2Error.INVALID_PARAMS).

    • getOptStringArray

      public String[] getOptStringArray(int position, String[] defaultValue) throws JSONRPC2Error
      Retrieves the specified optional string array (maps from JSON array of strings) parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a string array.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptStringArray

      public String[] getOptStringArray(int position, boolean allowNull, String[] defaultValue) throws JSONRPC2Error
      Retrieves the specified optional string array (maps from JSON array of strings) parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a string array.
      Throws:
      JSONRPC2Error - On a bad parameter type (JSONRPC2Error.INVALID_PARAMS).

    • getMap

      public Map<String,Object> getMap(int position) throws JSONRPC2Error
      Retrieves the specified map (maps from JSON object) parameter.
      Parameters:
      position - The parameter position.
      Returns:
      The parameter value as a map.
      Throws:
      JSONRPC2Error - On a missing parameter, bad type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getMap

      public Map<String,Object> getMap(int position, boolean allowNull) throws JSONRPC2Error
      Retrieves the specified map (maps from JSON object) parameter.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      Returns:
      The parameter value as a map.
      Throws:
      JSONRPC2Error - On a missing parameter or bad type (JSONRPC2Error.INVALID_PARAMS).

    • getOptMap

      public Map<String,Object> getOptMap(int position, Map<String,Object> defaultValue) throws JSONRPC2Error
      Retrieves the specified optional map (maps from JSON object) parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a map.
      Throws:
      JSONRPC2Error - On a bad parameter type or null value (JSONRPC2Error.INVALID_PARAMS).

    • getOptMap

      public Map<String,Object> getOptMap(int position, boolean allowNull, Map<String,Object> defaultValue) throws JSONRPC2Error
      Retrieves the specified optional map (maps from JSON object) parameter. If it doesn't exist the method will return the specified default value.
      Parameters:
      position - The parameter position.
      allowNull - If true allows a null value.
      defaultValue - The default return value if the parameter doesn't exist. May be null.
      Returns:
      The parameter value as a map.
      Throws:
      JSONRPC2Error - On a bad parameter type (JSONRPC2Error.INVALID_PARAMS).