com.thetransactioncompany.jsonrpc2.util
Class PositionalParamsRetriever

java.lang.Object
  com.thetransactioncompany.jsonrpc2.util.ParamsRetriever
      com.thetransactioncompany.jsonrpc2.util.PositionalParamsRetriever

public class PositionalParamsRetriever
extends 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);
 }
 

Author:

Vladimir Dzhuvinov

Constructor Summary

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

Method Summary

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.
void	ensureParameter(int position) Deprecated.
<T> void	ensureParameter(int position, Class<T> clazz) Deprecated.
<T> void	ensureParameter(int position, Class<T> clazz, boolean allowNull) Deprecated.
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 insenstive 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 insenstive 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 insenstive 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.
boolean	hasParameter(int position) Deprecated.
int	size() Returns the parameter count.

Methods inherited from class com.thetransactioncompany.jsonrpc2.util.ParamsRetriever

getEnumStringMatch, getEnumStringMatch

Methods inherited from class java.lang.Object

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

Constructor Detail

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 Detail

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.

hasParameter

@Deprecated
public boolean hasParameter(int position)

Deprecated.

See Also:

hasParam(int)

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).

ensureParameter

@Deprecated
public void ensureParameter(int position)
                     throws JSONRPC2Error

Deprecated.

Throws:

JSONRPC2Error

See Also:

ensureParam(int)

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.

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).

ensureParameter

@Deprecated
public <T> void ensureParameter(int position,
                                           Class<T> clazz)
                     throws JSONRPC2Error

Deprecated.

Throws:

JSONRPC2Error

See Also:

ensureParam(int, Class)

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.

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).

ensureParameter

@Deprecated
public <T> void ensureParameter(int position,
                                           Class<T> clazz,
                                           boolean allowNull)
                     throws JSONRPC2Error

Deprecated.

Throws:

JSONRPC2Error

See Also:

ensureParam(int, Class, boolean)

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).

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).

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.

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.

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 insenstive 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 insenstive 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).

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.

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.

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 insenstive match. If it doesn't exist the method will return the specified default value.

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).