Module javafx.base
Package javafx.beans.binding

Class StringExpression

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 Details

    • StringExpression

      public StringExpression()
      Creates a default StringExpression.

  • Method Details

    • 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