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package javax.faces.component;
import java.io.
Serializable;
import javax.faces.component.
StateHolder;
import javax.faces.context.
FacesContext;
import javax.faces.el.
EvaluationException;
import javax.faces.el.
PropertyNotFoundException;
import javax.faces.el.
ValueBinding;
import javax.el.
ValueExpression;
import javax.el.
ELException;
/**
* <p>Wrap a ValueExpression instance and expose it as a ValueBinding</p>
*
* @author Jacob Hookom
*/
class
ValueBindingValueExpressionAdapter extends
ValueBinding implements
StateHolder,
Serializable {
private static final long
serialVersionUID = -8015491904782686906L;
private
ValueExpression valueExpression= null;
private boolean
tranzient;
public
ValueBindingValueExpressionAdapter() {} // for StateHolder
ValueBindingValueExpressionAdapter(
ValueExpression valueExpression) {
this.
valueExpression =
valueExpression;
}
/* (non-Javadoc)
* @see javax.faces.el.ValueBinding#getExpressionString()
*/
public
String getExpressionString() {
assert(null !=
valueExpression);
return
valueExpression.
getExpressionString();
}
/* (non-Javadoc)
* @see javax.faces.el.ValueBinding#getType(javax.faces.context.FacesContext)
*/
public
Class getType(
FacesContext context) throws
EvaluationException,
PropertyNotFoundException {
if (
context == null) {
throw new
NullPointerException("FacesContext -> null");
}
Class result = null;
try {
result =
valueExpression.
getType(
context.
getELContext());
} catch (javax.el.
PropertyNotFoundException pnfe) {
throw new
PropertyNotFoundException(
pnfe);
} catch (
ELException elex) {
throw new
EvaluationException(
elex);
}
return
result;
}
/* (non-Javadoc)
* @see javax.faces.el.ValueBinding#getValue(javax.faces.context.FacesContext)
*/
public
Object getValue(
FacesContext context) throws
EvaluationException,
PropertyNotFoundException {
if (
context == null) {
throw new
NullPointerException("FacesContext -> null");
}
Object result = null;
try {
result =
valueExpression.
getValue(
context.
getELContext());
} catch (javax.el.
PropertyNotFoundException pnfe) {
throw new
PropertyNotFoundException(
pnfe);
} catch (
ELException elex) {
throw new
EvaluationException(
elex);
}
return
result;
}
/* (non-Javadoc)
* @see javax.faces.el.ValueBinding#isReadOnly(javax.faces.context.FacesContext)
*/
public boolean
isReadOnly(
FacesContext context) throws
EvaluationException,
PropertyNotFoundException {
if (
context == null) {
throw new
NullPointerException("FacesContext -> null");
}
boolean
result = false;
try {
result =
valueExpression.
isReadOnly(
context.
getELContext());
} catch (
ELException elex) {
throw new
EvaluationException(
elex);
}
return
result;
}
/* (non-Javadoc)
* @see javax.faces.el.ValueBinding#setValue(javax.faces.context.FacesContext, java.lang.Object)
*/
public void
setValue(
FacesContext context,
Object value)
throws
EvaluationException,
PropertyNotFoundException {
if (
context == null) {
throw new
NullPointerException("FacesContext -> null");
}
try {
valueExpression.
setValue(
context.
getELContext(),
value);
} catch (javax.el.
PropertyNotFoundException pnfe) {
throw new
PropertyNotFoundException(
pnfe);
} catch (javax.el.
PropertyNotWritableException pnwe) {
throw new
PropertyNotFoundException(
pnwe);
} catch (
ELException elex) {
throw new
EvaluationException(
elex);
}
}
public boolean
isTransient() {
return this.
tranzient;
}
public void
setTransient(boolean
tranzient) {
this.
tranzient =
tranzient;
}
public
Object saveState(
FacesContext context){
if (
context == null) {
throw new
NullPointerException();
}
Object result = null;
if (!
tranzient) {
if (
valueExpression instanceof
StateHolder) {
Object []
stateStruct = new
Object[2];
// save the actual state of our wrapped valueExpression
stateStruct[0] = ((
StateHolder)
valueExpression).
saveState(
context);
// save the class name of the valueExpression impl
stateStruct[1] =
valueExpression.
getClass().
getName();
result =
stateStruct;
}
else {
result =
valueExpression;
}
}
return
result;
}
public void
restoreState(
FacesContext context,
Object state) {
if (
context == null) {
throw new
NullPointerException();
}
// if we have state
if (null ==
state) {
return;
}
if (!(
state instanceof
ValueExpression)) {
Object []
stateStruct = (
Object [])
state;
Object savedState =
stateStruct[0];
String className =
stateStruct[1].
toString();
ValueExpression result = null;
Class toRestoreClass = null;
if (null !=
className) {
try {
toRestoreClass =
loadClass(
className, this);
}
catch (
ClassNotFoundException e) {
throw new
IllegalStateException(
e.
getMessage());
}
if (null !=
toRestoreClass) {
try {
result =
(
ValueExpression)
toRestoreClass.
newInstance();
}
catch (
InstantiationException e) {
throw new
IllegalStateException(
e.
getMessage());
}
catch (
IllegalAccessException a) {
throw new
IllegalStateException(
a.
getMessage());
}
}
if (null !=
result && null !=
savedState) {
// don't need to check transient, since that was
// done on the saving side.
((
StateHolder)
result).
restoreState(
context,
savedState);
}
valueExpression =
result;
}
}
else {
valueExpression = (
ValueExpression)
state;
}
}
public boolean
equals(
Object other) {
if (
other == this) {
return true;
}
if (
other instanceof
ValueBindingValueExpressionAdapter) {
ValueExpression expr =
((
ValueBindingValueExpressionAdapter)
other).
getWrapped();
return (
valueExpression.
equals(
expr));
} else if (
other instanceof
ValueBinding) {
FacesContext context =
FacesContext.
getCurrentInstance();
ValueBinding otherVB = (
ValueBinding)
other;
Class type =
otherVB.
getType(
context);
if (
type != null) {
return
type.
equals(
valueExpression.
getType(
context.
getELContext()));
}
}
return false;
}
public int
hashCode() {
assert(null !=
valueExpression);
return
valueExpression.
hashCode();
}
public
ValueExpression getWrapped() {
return
valueExpression;
}
//
// Helper methods for StateHolder
//
private static
Class loadClass(
String name,
Object fallbackClass) throws
ClassNotFoundException {
ClassLoader loader =
Thread.
currentThread().
getContextClassLoader();
if (
loader == null) {
loader =
fallbackClass.
getClass().
getClassLoader();
}
return
Class.
forName(
name, true,
loader);
}
}