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package javax.faces.el;
import javax.faces.context.FacesContext;
/**
* ValueBinding is an object that can be used
* to access the property represented by an action or value binding
* expression. An immutable {@link ValueBinding} for a particular value binding
* can be acquired by calling the createValueBinding() method of
* the {@link javax.faces.application.Application} instance for this web
* application.
*
* @deprecated This has been replaced by {@link javax.el.ValueExpression}.
*/
public abstract class ValueBinding {
/**
* Return the value of the property represented by this
* {@link ValueBinding}, relative to the specified {@link FacesContext}.
*
*
* @param context {@link FacesContext} for the current request
*
* @throws EvaluationException if an exception is thrown while getting
* the value (the thrown exception must be included as the
* cause property of this exception)
* @throws NullPointerException if context
* is null
* @throws PropertyNotFoundException if a specified property name
* does not exist, or is not readable
*
* @return the value of this expression
*/
public abstract Object getValue(FacesContext context)
throws EvaluationException, PropertyNotFoundException;
/**
* Set the value of the property represented by this
* {@link ValueBinding}, relative to the specified {@link FacesContext}.
*
*
* @param context {@link FacesContext} for the current request
* @param value The new value to be set
*
* @throws EvaluationException if an exception is thrown while setting
* the value (the thrown exception must be included as the
* cause property of this exception)
* @throws NullPointerException if context
* is null
* @throws PropertyNotFoundException if a specified property name
* does not exist, or is not writeable
*/
public abstract void setValue(FacesContext context, Object value)
throws EvaluationException, PropertyNotFoundException;
/**
* Return true if the specified property of the specified
* property is known to be immutable; otherwise, return
* false.
*
* @param context {@link FacesContext} for the current request
*
* @throws EvaluationException if an exception is thrown while getting
* the description of the property (the thrown exception must be
* included as the cause property of this exception)
* @throws NullPointerException if context
* is null
* @throws PropertyNotFoundException if a specified property name
* does not exist
*
* @return whether or not this expression is read only
*/
public abstract boolean isReadOnly(FacesContext context)
throws EvaluationException, PropertyNotFoundException;
/**
* Return the type of the property represented by this
* {@link ValueBinding}, relative to the specified {@link FacesContext}.
*
*
* @param context {@link FacesContext} for the current request
*
* @throws EvaluationException if an exception is thrown while getting
* the description of the property (the thrown exception must be
* included as the cause property of this exception)
* @throws NullPointerException if context
* is null
* @throws PropertyNotFoundException if a specified property name
* does not exist
*
* @return the Java type of this expression
*/
public abstract Class getType(FacesContext context)
throws EvaluationException, PropertyNotFoundException;
/**
* Return the (possibly null) expression String,
* including the delimiters, from which this
* ValueBinding was built.
*
* @return the expression string
*/
public String getExpressionString() {
return null;
}
}