Package trclib.dataprocessor

Class TrcHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

trclib.dataprocessor.TrcHashMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

public class TrcHashMap<K,V>
extends HashMap<K,V>

This class implements the TrcHashMap. TrcHashMap extends HashMap and added the add method so you can easily append multiple hash map entries in a single statement. It can also differentiate the case of key not found from the case of key maps to null. In the case of key not found, instead of returning null, it throws an exception. TrcHashMap can accommodate different types of object in the same map. So it provides methods to get the appropriate data type from the map. It throws an exception if the type is not what you expect.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
TrcHashMap()

Method Summary

Modifier and Type	Method	Description
TrcHashMap<K,V>	add(K key, V value)	This method adds an entry to the hash map and returns this hashmap object so you can chain multiple calls to the add method in a single statement.
V	get(Object key)	This method returns the value mapped the given key and throws an exception if the key cannot be found in the hashmap.
Boolean	getBoolean(Object key)	This method returns the boolean value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.
Double	getDouble(Object key)	This method returns the double value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.
Float	getFloat(Object key)	This method returns the float value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.
Integer	getInteger(Object key)	This method returns the integer value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.
String	getString(Object key)	This method returns the string value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Details

TrcHashMap

public TrcHashMap()

Method Details

add

public TrcHashMap<K,V> add(K key,
 V value)

This method adds an entry to the hash map and returns this hashmap object so you can chain multiple calls to the add method in a single statement.

Parameters:

key - specifies the key of the mapping.

value - specifies the value of the mappng.

Returns:

this hashmap instance.

get

public V get(Object key)

This method returns the value mapped the given key and throws an exception if the key cannot be found in the hashmap.

Specified by:

get in interface Map<K,V>

Overrides:

get in class HashMap<K,V>

Parameters:

key - specifies the key of the mapping to look for.

Returns:

the value mapped to the key.

Throws:

NoSuchElementException - if key is not in hashmap.

getInteger

public Integer getInteger(Object key)

This method returns the integer value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.

Parameters:

key - specifies the key of the mapping to look for.

Returns:

the integer value mapped to the key.

Throws:

IllegalArgumentException - if key is not in hashmap.

ClassCastException - if value is not the correct type.

getFloat

public Float getFloat(Object key)

This method returns the float value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.

Parameters:

key - specifies the key of the mapping to look for.

Returns:

the float value mapped to the key.

Throws:

IllegalArgumentException - if key is not in hashmap.

ClassCastException - if value is not the correct type.

getDouble

public Double getDouble(Object key)

This method returns the double value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.

Parameters:

key - specifies the key of the mapping to look for.

Returns:

the double value mapped to the key.

Throws:

IllegalArgumentException - if key is not in hashmap.

ClassCastException - if value is not the correct type.

getBoolean

public Boolean getBoolean(Object key)

This method returns the boolean value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.

Parameters:

key - specifies the key of the mapping to look for.

Returns:

the boolean value mapped to the key.

Throws:

IllegalArgumentException - if key is not in hashmap.

ClassCastException - if value is not the correct type.

getString

public String getString(Object key)

This method returns the string value mapped the given key and throws an exception if the key cannot be found in the hashmap or if the value is not the correct type.

Parameters:

key - specifies the key of the mapping to look for.

Returns:

the string value mapped to the key.

Throws:

IllegalArgumentException - if key is not in hashmap.

ClassCastException - if value is not the correct type.