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package javax.faces.component;
import javax.el.
ValueExpression;
import javax.el.
ELException;
import javax.el.
ELContext;
import javax.faces.el.
ValueBinding;
import javax.faces.context.
FacesContext;
import javax.faces.component.
StateHolder;
import java.io.
Serializable;
/**
* <p>Wrap a ValueBinding instance and expose it as a
* ValueExpression.</p>
*/
class
ValueExpressionValueBindingAdapter extends
ValueExpression implements
Serializable,
StateHolder {
private static final long
serialVersionUID = 2388977392466671243L;
public
ValueExpressionValueBindingAdapter() {}
private
ValueBinding binding = null;
ValueExpressionValueBindingAdapter(
ValueBinding binding) {
assert(null !=
binding);
this.
binding =
binding;
}
//
// Methods from ValueExpression
//
public
Object getValue(
ELContext context) throws
ELException {
assert(null !=
binding);
if (
context == null) {
throw new
NullPointerException("ELContext -> null");
}
Object result = null;
FacesContext facesContext = (
FacesContext)
context.
getContext(
FacesContext.class);
assert(null !=
facesContext);
try {
result =
binding.
getValue(
facesContext);
}
catch (
Throwable e) {
throw new
ELException(
e);
}
return
result;
}
public void
setValue(
ELContext context,
Object value) throws
ELException {
assert(null !=
binding);
if (
context == null) {
throw new
NullPointerException("ELContext -> null");
}
FacesContext facesContext = (
FacesContext)
context.
getContext(
FacesContext.class);
assert(null !=
facesContext);
try {
binding.
setValue(
facesContext,
value);
}
catch (
Throwable e) {
throw new
ELException(
e);
}
}
public boolean
isReadOnly(
ELContext context) throws
ELException {
assert(null !=
binding);
if (
context == null) {
throw new
NullPointerException("ELContext -> null");
}
boolean
result = false;
FacesContext facesContext = (
FacesContext)
context.
getContext(
FacesContext.class);
assert(null !=
facesContext);
try {
result =
binding.
isReadOnly(
facesContext);
}
catch (
Throwable e) {
throw new
ELException(
e);
}
return
result;
}
public
Class<?>
getType(
ELContext context) throws
ELException {
assert(null !=
binding);
if (
context == null) {
throw new
NullPointerException("ELContext -> null");
}
Class result = null;
FacesContext facesContext = (
FacesContext)
context.
getContext(
FacesContext.class);
assert(null !=
facesContext);
try {
result =
binding.
getType(
facesContext);
}
catch (
Throwable e) {
throw new
ELException(
e);
}
return
result;
}
/**
* <p>Always return <code>false</code> since we can't possibly know
* if this is a literal text binding or not.</p>
*/
public boolean
isLiteralText() {
return false;
}
public
Class<?>
getExpectedType() {
assert(null !=
binding);
Class result = null;
FacesContext context =
FacesContext.
getCurrentInstance();
try {
Object value =
binding.
getValue(
context);
result =
value.
getClass();
}
catch (
Throwable e) {
result = null;
}
return
result;
}
public
String getExpressionString() {
assert(null !=
binding);
return
binding.
getExpressionString();
}
public boolean
equals(
Object other) {
if (
other == this) {
return true;
}
if (
other instanceof
ValueExpressionValueBindingAdapter) {
ValueBinding vb =
((
ValueExpressionValueBindingAdapter)
other).
getWrapped();
return (
binding.
equals(
vb));
} else if (
other instanceof
ValueExpression) {
FacesContext context =
FacesContext.
getCurrentInstance();
ValueExpression otherVE = (
ValueExpression)
other;
Class type =
binding.
getType(
context);
if (
type != null) {
return
type.
equals(
otherVE.
getType(
context.
getELContext()));
}
}
return false;
}
public int
hashCode() {
assert(null !=
binding);
return
binding.
hashCode();
}
public
String getDelimiterSyntax() {
// PENDING (visvan) Implementation
return "";
}
//
// Methods from StateHolder
//
public
Object saveState(
FacesContext context) {
if (
context == null) {
throw new
NullPointerException();
}
Object result = null;
if (!
tranzient) {
if (
binding instanceof
StateHolder) {
Object []
stateStruct = new
Object[2];
// save the actual state of our wrapped binding
stateStruct[0] = ((
StateHolder)
binding).
saveState(
context);
// save the class name of the binding impl
stateStruct[1] =
binding.
getClass().
getName();
result =
stateStruct;
}
else {
result =
binding;
}
}
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
ValueBinding)) {
Object []
stateStruct = (
Object [])
state;
Object savedState =
stateStruct[0];
String className =
stateStruct[1].
toString();
ValueBinding 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 =
(
ValueBinding)
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);
}
binding =
result;
}
}
else {
binding = (
ValueBinding)
state;
}
}
private boolean
tranzient = false;
public boolean
isTransient() {
return
tranzient;
}
public void
setTransient(boolean
newTransientValue) {
tranzient =
newTransientValue;
}
//
// 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);
}
//
// methods used by classes aware of this class's wrapper nature
//
public
ValueBinding getWrapped() {
return
binding;
}
}