java.lang.Object
- javafx.beans.binding.StringExpression

All Implemented Interfaces:

Observable, ObservableObjectValue<String>, ObservableStringValue, ObservableValue<String>

Direct Known Subclasses:

ReadOnlyStringProperty, StringBinding
```
public abstract class StringExpression
extends Object
implements ObservableStringValue
```
StringExpression is an ObservableStringValue plus additional convenience methods to generate bindings in a fluent style.
A concrete sub-class of StringExpression has to implement the method ObservableObjectValue.get(), which provides the actual value of this expression.
Note: all implementation of BooleanBinding returned by the comparisons in this class consider a String that is null equal to an empty String.

Since:

JavaFX 2.0

Constructor Summary

Constructors
Constructor Description

StringExpression()

Method Summary

Modifier and Type	Method	Description
`StringExpression`	`concat(Object other)`	Returns a `StringExpression` that holds the value of this `StringExpression` concatenated with another `Object`.
`String`	`getValue()`	Returns the current value of this `ObservableValue`
`String`	`getValueSafe()`	Returns usually the value of this `StringExpression`.
`BooleanBinding`	`greaterThan(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is greater than a constant value.
`BooleanBinding`	`greaterThan(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is greater than another `ObservableStringValue`.
`BooleanBinding`	`greaterThanOrEqualTo(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is greater than or equal to a constant value.
`BooleanBinding`	`greaterThanOrEqualTo(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is greater than or equal to another `ObservableStringValue`.
`BooleanBinding`	`isEmpty()`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is empty.
`BooleanBinding`	`isEqualTo(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is equal to a constant value.
`BooleanBinding`	`isEqualTo(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this and another `ObservableStringValue` are equal.
`BooleanBinding`	`isEqualToIgnoreCase(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is equal to a constant value ignoring case.
`BooleanBinding`	`isEqualToIgnoreCase(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this and another `ObservableStringValue` are equal ignoring case.
`BooleanBinding`	`isNotEmpty()`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is not empty.
`BooleanBinding`	`isNotEqualTo(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is not equal to a constant value.
`BooleanBinding`	`isNotEqualTo(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this and another `ObservableStringValue` are not equal.
`BooleanBinding`	`isNotEqualToIgnoreCase(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is not equal to a constant value ignoring case.
`BooleanBinding`	`isNotEqualToIgnoreCase(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this and another `ObservableStringValue` are not equal ignoring case.
`BooleanBinding`	`isNotNull()`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is not `null`.
`BooleanBinding`	`isNull()`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is `null`.
`IntegerBinding`	`length()`	Creates a new `IntegerBinding` that holds the length of this `StringExpression`.
`BooleanBinding`	`lessThan(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is less than a constant value.
`BooleanBinding`	`lessThan(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is less than another `ObservableStringValue`.
`BooleanBinding`	`lessThanOrEqualTo(String other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is less than or equal to a constant value.
`BooleanBinding`	`lessThanOrEqualTo(ObservableStringValue other)`	Creates a new `BooleanBinding` that holds `true` if this `StringExpression` is less than or equal to another `ObservableStringValue`.
`static StringExpression`	`stringExpression(ObservableValue<?> value)`	Returns a `StringExpression` that wraps a `ObservableValue`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface javafx.beans.Observable
addListener, removeListener

Methods inherited from interface javafx.beans.value.ObservableObjectValue
get

Methods inherited from interface javafx.beans.value.ObservableValue
addListener, removeListener

- Constructor Detail
  - StringExpression
```
public StringExpression()
```
- Method Detail
  - getValue
```
public String getValue()
```
    Description copied from interface: ObservableValue
    
    Returns the current value of this ObservableValue
    
    Specified by:
    
    getValue in interface ObservableValue<String>
    
    Returns:
    
    The current value
  - getValueSafe
```
public final String getValueSafe()
```
    Returns usually the value of this StringExpression. Only if the value is null an empty String is returned instead.
    
    Returns:
    
    the value of this StringExpression or the empty String
  - stringExpression
```
public static StringExpression stringExpression(ObservableValue<?> value)
```
    Returns a StringExpression that wraps a ObservableValue. If the ObservableValue is already a StringExpression, it will be returned. Otherwise a new StringBinding is created that holds the value of the ObservableValue converted to a String.
    
    Parameters:
    
    value - The source ObservableValue
    
    Returns:
    
    A StringExpression that wraps the ObservableValue if necessary
    
    Throws:
    
    NullPointerException - if value is null
  - concat
```
public StringExpression concat(Object other)
```
    Returns a StringExpression that holds the value of this StringExpression concatenated with another Object.
    If the value of this StringExpression changes, the value of the resulting StringExpression is updated automatically. Also if the other Object is an implementation of ObservableValue, changes in the other Object are reflected automatically in the resulting StringExpression.
    
    Parameters:
    
    other - the other Object
    
    Returns:
    
    the new StringExpression
  - isEqualTo
```
public BooleanBinding isEqualTo(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this and another ObservableStringValue are equal.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - isEqualTo
```
public BooleanBinding isEqualTo(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is equal to a constant value.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - isNotEqualTo
```
public BooleanBinding isNotEqualTo(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this and another ObservableStringValue are not equal.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - isNotEqualTo
```
public BooleanBinding isNotEqualTo(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is not equal to a constant value.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - isEqualToIgnoreCase
```
public BooleanBinding isEqualToIgnoreCase(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this and another ObservableStringValue are equal ignoring case.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the second ObservableStringValue
    
    Returns:
    
    the new BooleanBinding
  - isEqualToIgnoreCase
```
public BooleanBinding isEqualToIgnoreCase(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is equal to a constant value ignoring case.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - isNotEqualToIgnoreCase
```
public BooleanBinding isNotEqualToIgnoreCase(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this and another ObservableStringValue are not equal ignoring case.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the second ObservableStringValue
    
    Returns:
    
    the new BooleanBinding
  - isNotEqualToIgnoreCase
```
public BooleanBinding isNotEqualToIgnoreCase(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is not equal to a constant value ignoring case.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - greaterThan
```
public BooleanBinding greaterThan(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is greater than another ObservableStringValue.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the second ObservableStringValue
    
    Returns:
    
    the new BooleanBinding
  - greaterThan
```
public BooleanBinding greaterThan(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is greater than a constant value.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - lessThan
```
public BooleanBinding lessThan(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is less than another ObservableStringValue.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the second ObservableStringValue
    
    Returns:
    
    the new BooleanBinding
  - lessThan
```
public BooleanBinding lessThan(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is less than a constant value.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - greaterThanOrEqualTo
```
public BooleanBinding greaterThanOrEqualTo(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is greater than or equal to another ObservableStringValue.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the second ObservableStringValue
    
    Returns:
    
    the new BooleanBinding
  - greaterThanOrEqualTo
```
public BooleanBinding greaterThanOrEqualTo(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is greater than or equal to a constant value.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - lessThanOrEqualTo
```
public BooleanBinding lessThanOrEqualTo(ObservableStringValue other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is less than or equal to another ObservableStringValue.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the second ObservableStringValue
    
    Returns:
    
    the new BooleanBinding
  - lessThanOrEqualTo
```
public BooleanBinding lessThanOrEqualTo(String other)
```
    Creates a new BooleanBinding that holds true if this StringExpression is less than or equal to a constant value.
    Note: In this comparison a String that is null is considered equal to an empty String.
    
    Parameters:
    
    other - the constant value
    
    Returns:
    
    the new BooleanBinding
  - isNull
```
public BooleanBinding isNull()
```
    Creates a new BooleanBinding that holds true if this StringExpression is null.
    
    Returns:
    
    the new BooleanBinding
  - isNotNull
```
public BooleanBinding isNotNull()
```
    Creates a new BooleanBinding that holds true if this StringExpression is not null.
    
    Returns:
    
    the new BooleanBinding
  - length
```
public IntegerBinding length()
```
    Creates a new IntegerBinding that holds the length of this StringExpression.
    Note: If the value of this StringExpression is null, the length is considered to be 0.
    
    Returns:
    
    the new IntegerBinding
    
    Since:
    
    JavaFX 8.0
  - isEmpty
```
public BooleanBinding isEmpty()
```
    Creates a new BooleanBinding that holds true if this StringExpression is empty.
    Note: If the value of this StringExpression is null, it is considered to be empty.
    
    Returns:
    
    the new BooleanBinding
    
    Since:
    
    JavaFX 8.0
  - isNotEmpty
```
public BooleanBinding isNotEmpty()
```
    Creates a new BooleanBinding that holds true if this StringExpression is not empty.
    Note: If the value of this StringExpression is null, it is considered to be empty.
    
    Returns:
    
    the new BooleanBinding
    
    Since:
    
    JavaFX 8.0

Class StringExpression

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface javafx.beans.Observable

Methods inherited from interface javafx.beans.value.ObservableObjectValue

Methods inherited from interface javafx.beans.value.ObservableValue

Constructor Detail

StringExpression

Method Detail

getValue

getValueSafe

stringExpression

concat

isEqualTo

isEqualTo

isNotEqualTo

isNotEqualTo

isEqualToIgnoreCase

isEqualToIgnoreCase

isNotEqualToIgnoreCase

isNotEqualToIgnoreCase

greaterThan

greaterThan

lessThan

lessThan

greaterThanOrEqualTo

greaterThanOrEqualTo

lessThanOrEqualTo

lessThanOrEqualTo

isNull

isNotNull

length

isEmpty

isNotEmpty