Value (OpenJPA Parent POM 2.4.2 API)

java.lang.Object
- org.apache.openjpa.lib.conf.Value

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

BooleanValue, DoubleValue, FileValue, IntValue, ObjectValue, StringListValue, StringValue
```
public abstract class Value
extends Object
implements Cloneable
```
A configuration value.

Author:

Marc Prud'hommeaux, Pinaki Poddar

Field Summary

Fields
Modifier and Type Field and Description

static String INVISIBLE

Fields
Modifier and Type	Field and Description
`static String`	`INVISIBLE`

Constructor Summary

Constructors
Constructor and Description

Value()
Default constructor.

Value(String prop)
Constructor.

Constructors
Constructor and Description
`Value()` Default constructor.
`Value(String prop)` Constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addEquivalentKey(String other)` Adds a moniker that is equivalent to the original property key used during construction.
`void`	`addListener(ValueListener listener)` Listener for value changes.
`String`	`alias(String str)` Alias the given setting.
`protected String`	`alias(String str, String[] aliases, boolean nullNotFound)` Alias the given setting.
`protected void`	`assertChangeable()` Asserts if this receiver can be changed.
`Object`	`clone()`
`boolean`	`equals(Object other)` Use `original value` instead of `current value` because they are one and the same for non-dynamic Values and ensures that modifying dynamic Values do not impact equality or hashCode contract.
`abstract Object`	`get()` Get the actual data stored in this value.
`String[]`	`getAliases()` Aliases for the value in the form key1, value1, key2, value2, ...
`String`	`getDefault()` The default value for the property as a string.
`Set<String>`	`getEquivalentKeys()` Gets the unmodifiable view of the equivalent keys or an empty set if no equivalent key has been added.
`String`	`getInstantiatingGetter()` The name of the getter method for the instantiated value of this property(as opposed to the string value)
`protected abstract String`	`getInternalString()` Return the internal string form of this value.
`List<ValueListener>`	`getListeners()` Gets unmodifable list of listeners for value changes.
`String`	`getLoadKey()` The key under which this value was loaded, or null.
`String`	`getOriginalValue()` Gets the original value.
`String`	`getProperty()` The property name that will be used when setting or getting this value in a `Map`.
`List<String>`	`getPropertyKeys()` Gets unmodifiable view of all the property keys set on this receiver.
`Class`	`getScope()` A class defining the scope in which this value is defined.
`String`	`getString()` Return a stringified version of this value.
`abstract Class<?>`	`getValueType()` Returns the type of the property that this Value represents.
`int`	`hashCode()` Use `original value` instead of `current value` because they are one and the same for non-dynamic Values and ensures that modifying dynamic Values do not impact equality or hashCode contract.
`void`	`hide()` Hides the value of this Value from being output to the caller.
`boolean`	`isAliasListComprehensive()` Whether or not the alias list defines all possible settings for this value.
`boolean`	`isDynamic()` Affirms if this receiver can be mutated even when the configuration it belongs to has been `frozen`.
`boolean`	`isHidden()` Affirms if the value for this Value is visible.
`boolean`	`isPrivate()` Affirms if this Value is used for internal purpose only and not exposed as a supported property.
`void`	`makePrivate()` Marks this Value for internal purpose only.
`boolean`	`matches(String p)` Affirms if the given key matches the property (or any of its equivalent).
`void`	`removeListener(ValueListener listener)`
`void`	`setAlias(String key, String value)` Replaces an existing alias, or adds the given alias to the front of the alias list if it does not already exist.
`protected String[]`	`setAlias(String key, String value, String[] aliases)` Set an alias into a current alias list, returning the new list.
`void`	`setAliases(String[] aliases)` Aliases for the value in the form key1, value1, key2, value2, ...
`void`	`setAliasListComprehensive(boolean aliasListIsComprehensive)` Whether or not the alias list defines all possible settings for this value.
`void`	`setDefault(String def)` The default value for the property as a string.
`void`	`setDynamic(boolean flag)` Sets if this receiver can be mutated even when the configuration it belongs to has been `frozen`.
`void`	`setInstantiatingGetter(String getter)` The name of the getter method for the instantiated value of this property(as opposed to the string value).
`protected abstract void`	`setInternalObject(Object obj)` Set this value from an object.
`protected abstract void`	`setInternalString(String str)` Set this value from the given string.
`void`	`setLoadKey(String key)` Sets key under which this value was loaded.
`void`	`setObject(Object obj)` Set this value as an object.
`void`	`setProperty(String prop)` The property name that will be used when setting or getting this value in a `Map`.
`void`	`setScope(Class cls)` A class defining the scope in which this value is defined.
`void`	`setString(String val)` Set this value from the given string.
`String`	`toString()`
`String`	`unalias(String str)` Unalias the given setting.
`protected String`	`unalias(String str, String[] aliases, boolean nullNotFound)` Unalias the given setting.
`void`	`valueChanged()` Subclasses should call this method when their internal value changes.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - INVISIBLE
```
public static final String INVISIBLE
```
    See Also:
    Constant Field Values
- Constructor Detail
  - Value
```
public Value()
```
    Default constructor.
  - Value
```
public Value(String prop)
```
    Constructor. Supply the property name.
    
    See Also:
    setProperty(java.lang.String)
- Method Detail
  - getProperty
```
public String getProperty()
```
    The property name that will be used when setting or getting this value in a Map.
  - setProperty
```
public void setProperty(String prop)
```
    The property name that will be used when setting or getting this value in a Map.
  - addEquivalentKey
```
public void addEquivalentKey(String other)
```
    Adds a moniker that is equivalent to the original property key used during construction.
    
    Since:
    
    2.0.0
  - getEquivalentKeys
```
public Set<String> getEquivalentKeys()
```
    Gets the unmodifiable view of the equivalent keys or an empty set if no equivalent key has been added.
    
    Since:
    
    2.0.0
  - getPropertyKeys
```
public List<String> getPropertyKeys()
```
    Gets unmodifiable view of all the property keys set on this receiver. The 0-th element in the returned list is always the same as the original key returned by getProperty() method.
    
    Since:
    
    2.0.0
  - matches
```
public boolean matches(String p)
```
    Affirms if the given key matches the property (or any of its equivalent).
    
    Since:
    
    2.0.0
  - getLoadKey
```
public String getLoadKey()
```
    The key under which this value was loaded, or null.
  - setLoadKey
```
public void setLoadKey(String key)
```
    Sets key under which this value was loaded.
    
    Throws:
    
    if - called with a non-null key which is different from an already loaded key.
  - getAliases
```
public String[] getAliases()
```
    Aliases for the value in the form key1, value1, key2, value2, ... All alias values must be in string form.
  - setAliases
```
public void setAliases(String[] aliases)
```
    Aliases for the value in the form key1, value1, key2, value2, ... All alias values must be in string form.
    To avoid potential side-effects, this method copies the array passed in.
  - setAlias
```
public void setAlias(String key,
            String value)
```
    Replaces an existing alias, or adds the given alias to the front of the alias list if it does not already exist. All alias values must be in string form.
  - setAlias
```
protected String[] setAlias(String key,
                String value,
                String[] aliases)
```
    Set an alias into a current alias list, returning the new list.
  - isAliasListComprehensive
```
public boolean isAliasListComprehensive()
```
    Whether or not the alias list defines all possible settings for this value. If so, an error will be generated when attempting to invoke any method on this value with an unknown option.
  - setAliasListComprehensive
```
public void setAliasListComprehensive(boolean aliasListIsComprehensive)
```
    Whether or not the alias list defines all possible settings for this value. If so, an error will be generated when attempting to invoke any method on this value with an unknown option.
  - alias
```
public String alias(String str)
```
    Alias the given setting.
  - alias
```
protected String alias(String str,
           String[] aliases,
           boolean nullNotFound)
```
    Alias the given setting.
  - unalias
```
public String unalias(String str)
```
    Unalias the given setting.
  - unalias
```
protected String unalias(String str,
             String[] aliases,
             boolean nullNotFound)
```
    Unalias the given setting.
  - getDefault
```
public String getDefault()
```
    The default value for the property as a string.
  - setDefault
```
public void setDefault(String def)
```
    The default value for the property as a string.
  - getInstantiatingGetter
```
public String getInstantiatingGetter()
```
    The name of the getter method for the instantiated value of this property(as opposed to the string value)
  - setInstantiatingGetter
```
public void setInstantiatingGetter(String getter)
```
    The name of the getter method for the instantiated value of this property(as opposed to the string value). If the string starts with this., then the getter will be looked up on the value instance itself. Otherwise, the getter will be looked up on the configuration instance.
  - getScope
```
public Class getScope()
```
    A class defining the scope in which this value is defined. This will be used by the configuration framework to look up metadata about the value.
  - setScope
```
public void setScope(Class cls)
```
    A class defining the scope in which this value is defined. This will be used by the configuration framework to look up metadata about the value.
  - getString
```
public String getString()
```
    Return a stringified version of this value. If the current value has a short alias key, the alias key is returned.
  - setString
```
public void setString(String val)
```
    Set this value from the given string. If the given string is null or empty and a default is defined, the default is used. If the given string(or default) is an alias key, it will be converted to the corresponding value internally.
    If this Value is being set to a non-default value for the first time (as designated by originalString being null), then the value is remembered as original. This original value is used for equality and hashCode computation if this Value is dynamic.
  - setObject
```
public void setObject(Object obj)
```
    Set this value as an object.
    If this Value is being set to a non-default value for the first time (as designated by originalString being null), then the value is remembered as original. This original value is used for equality and hashCode computation if this Value is dynamic.
  - getOriginalValue
```
public String getOriginalValue()
```
    Gets the original value. Original value denotes the Stringified form of this Value, from which it has been set, if ever. If this Value has never been set to a non-default value, then returns the default value, which itself can be null.
    
    Since:
    
    1.1.0
  - getValueType
```
public abstract Class<?> getValueType()
```
    Returns the type of the property that this Value represents.
  - getInternalString
```
protected abstract String getInternalString()
```
    Return the internal string form of this value.
  - setInternalString
```
protected abstract void setInternalString(String str)
```
    Set this value from the given string.
  - setInternalObject
```
protected abstract void setInternalObject(Object obj)
```
    Set this value from an object.
  - getListeners
```
public List<ValueListener> getListeners()
```
    Gets unmodifable list of listeners for value changes.
  - addListener
```
public void addListener(ValueListener listener)
```
    Listener for value changes.
  - removeListener
```
public void removeListener(ValueListener listener)
```
  - valueChanged
```
public void valueChanged()
```
    Subclasses should call this method when their internal value changes.
  - assertChangeable
```
protected void assertChangeable()
```
    Asserts if this receiver can be changed. Subclasses must invoke this method before changing its internal state. This receiver can not be changed if all of the following is true
  - this receiver is not dynamic
  - ValueListener attached to this receiver is a Configuration
  - Configuration is read-only

setDynamic
```
public void setDynamic(boolean flag)
```
Sets if this receiver can be mutated even when the configuration it belongs to has been frozen.

Since:

1.1.0

isDynamic
```
public boolean isDynamic()
```
Affirms if this receiver can be mutated even when the configuration it belongs to has been frozen.

Since:

1.1.0

hashCode
```
public int hashCode()
```
Use original value instead of current value because they are one and the same for non-dynamic Values and ensures that modifying dynamic Values do not impact equality or hashCode contract.

Overrides:

hashCode in class Object

equals
```
public boolean equals(Object other)
```
Use original value instead of current value because they are one and the same for non-dynamic Values and ensures that modifying dynamic Values do not impact equality or hashCode contract.

Overrides:

equals in class Object

clone
```
public Object clone()
```
Overrides:

clone in class Object

isHidden
```
public boolean isHidden()
```
Affirms if the value for this Value is visible. Certain sensitive value such as password can be made invisible so that it is not returned to the user code.

hide
```
public void hide()
```
Hides the value of this Value from being output to the caller.

isPrivate
```
public boolean isPrivate()
```
Affirms if this Value is used for internal purpose only and not exposed as a supported property.

See Also:
Configuration.getPropertyKeys()

makePrivate
```
public void makePrivate()
```
Marks this Value for internal purpose only.

get
```
public abstract Object get()
```
Get the actual data stored in this value.

toString
```
public String toString()
```
Overrides:

toString in class Object

Class Value

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

INVISIBLE

Constructor Detail

Value

Value

Method Detail

getProperty

setProperty

addEquivalentKey

getEquivalentKeys

getPropertyKeys

matches

getLoadKey

setLoadKey

getAliases

setAliases

setAlias

setAlias

isAliasListComprehensive

setAliasListComprehensive

alias

alias

unalias

unalias

getDefault

setDefault

getInstantiatingGetter

setInstantiatingGetter

getScope

setScope

getString

setString

setObject

getOriginalValue

getValueType

getInternalString

setInternalString

setInternalObject

getListeners

addListener

removeListener

valueChanged

assertChangeable

setDynamic

isDynamic

hashCode

equals

clone

isHidden

hide

isPrivate

makePrivate

get

toString