PositionalParamsRetriever (JSON-RPC 2.0 Base 1.38 API)

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

Constructors
Constructor and Description

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

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

Method Summary

Methods
Modifier and Type	Method and 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.
`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).

Class PositionalParamsRetriever

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

PositionalParamsRetriever

Method Detail

getParams

size

hasParam

hasParameter

ensureParam

ensureParameter

ensureParam

ensureParameter

ensureParam

ensureParameter

get

get

get

getOpt

getOpt

getString

getString

getOptString

getOptString

getEnumString

getEnumString

getOptEnumString

getOptEnumString

getEnum

getEnum

getOptEnum

getOptEnum

getBoolean

getOptBoolean

getInt

getOptInt

getLong

getOptLong

getFloat

getOptFloat

getDouble

getOptDouble

getList

getList

getOptList

getOptList

getStringArray

getStringArray

getOptStringArray

getOptStringArray

getMap

getMap

getOptMap

getOptMap