Package org.zkoss.bind.impl

## Class PropertyExpression

- java.lang.Object
- - org.zkoss.bind.impl.PropertyExpression

- All Implemented Interfaces:
    `java.io.Serializable`, `Expression`, `ExpressionX`

      public class PropertyExpression
      extends java.lang.Object
      implements ExpressionX, java.io.Serializable

  An implementation of component property expression to evaluate it with a reflection method call instead of EL resolving.

  Note that this class is used for Data Binding internal only

  Since:
    8.0.0
  Author:
    jumperchen
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `PropertyExpression​(Component cmp, java.lang.String field)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `java.lang.Object` | `evaluate​(XelContext ctx)` | Evaluates an expression that was previously prepared.
    `java.lang.String` | `getExpressionString()` | Returns the expression in String form.
    `java.lang.Class` | `getType​(XelContext xelc)` | Returns the result type of this expression.
    `ValueReference` | `getValueReference​(XelContext xelc)` | Returns the target bean and field name of this expression.
    `boolean` | `isReadOnly​(XelContext ctx)` | Returns whether this is a read only (cannot setValue) expression.
    `void` | `setValue​(XelContext ctx, java.lang.Object value)` | Set values into the property resolved by this expression.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### PropertyExpression

          public PropertyExpression​(Component cmp,
                                    java.lang.String field)

  - ### Method Detail

    - #### evaluate

          public java.lang.Object evaluate​(XelContext ctx)
                                    throws XelException

      Description copied from interface: `Expression`
      Evaluates an expression that was previously prepared.
      Specified by:
        `evaluate` in interface `Expression`
      Throws:
        `XelException`

    - #### isReadOnly

          public boolean isReadOnly​(XelContext ctx)
                             throws XelException

      Description copied from interface: `ExpressionX`
      Returns whether this is a read only (cannot setValue) expression.
      Specified by:
        `isReadOnly` in interface `ExpressionX`
      Parameters:
        `ctx` - the evaluation context
      Returns:
        whether this is a read only (cannot setValue) expression.
      Throws:
        `XelException`

    - #### setValue

          public void setValue​(XelContext ctx,
                               java.lang.Object value)
                        throws XelException

      Description copied from interface: `ExpressionX`
      Set values into the property resolved by this expression.
      Specified by:
        `setValue` in interface `ExpressionX`
      Parameters:
        `ctx` - the evaluation context
        `value` - the value to be set into the property resolved by this expression
      Throws:
        `XelException`

    - #### getExpressionString

          public java.lang.String getExpressionString()

      Description copied from interface: `ExpressionX`
      Returns the expression in String form.
      Specified by:
        `getExpressionString` in interface `ExpressionX`
      Returns:
        the expression in String form.

    - #### getType

          public java.lang.Class getType​(XelContext xelc)

      Description copied from interface: `ExpressionX`
      Returns the result type of this expression.
      Specified by:
        `getType` in interface `ExpressionX`
      Parameters:
        `xelc` - the evaluation context
      Returns:
        the result type of this expression.

    - #### getValueReference

          public ValueReference getValueReference​(XelContext xelc)

      Description copied from interface: `ExpressionX`
      Returns the target bean and field name of this expression.
      Specified by:
        `getValueReference` in interface `ExpressionX`
      Parameters:
        `xelc` - the evaluation context
      Returns:
        the target bean and field name of this expression.