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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.
MethodBinding;
import javax.el.
MethodExpression;
import javax.el.
MethodInfo;
import javax.el.
ELException;
import javax.el.
ELContext;
import javax.el.
ExpressionFactory;
import javax.el.
ValueExpression;
import java.util.
Arrays;
import java.lang.reflect.
Method;
/**
* <p>Wrap a MethodExpression instance and expose it as a MethodBinding</p>
*
*/
class
MethodBindingMethodExpressionAdapter extends
MethodBinding implements
StateHolder,
Serializable {
private static final long
serialVersionUID = 7334926223014401689L;
private
MethodExpression methodExpression= null;
private boolean
tranzient;
public
MethodBindingMethodExpressionAdapter() {} // for StateHolder
MethodBindingMethodExpressionAdapter(
MethodExpression methodExpression) {
this.
methodExpression =
methodExpression;
}
public
Object invoke(
FacesContext context,
Object params[])
throws javax.faces.el.
EvaluationException, javax.faces.el.
MethodNotFoundException {
assert(null !=
methodExpression);
if (
context == null ) {
throw new
NullPointerException("FacesConext -> null");
}
Object result = null;
try {
result =
methodExpression.
invoke(
context.
getELContext(),
params);
}
catch (javax.el.
MethodNotFoundException e) {
throw new javax.faces.el.
MethodNotFoundException(
e);
}
catch (javax.el.
PropertyNotFoundException e) {
throw new
EvaluationException(
e);
}
catch (
ELException e) {
Throwable cause =
e.
getCause();
if (
cause == null) {
cause =
e;
}
throw new
EvaluationException(
cause);
} catch (
NullPointerException e) {
throw new javax.faces.el.
MethodNotFoundException(
e);
}
return
result;
}
public
Class getType(
FacesContext context) throws javax.faces.el.
MethodNotFoundException {
assert(null !=
methodExpression);
if (
context == null) {
throw new
NullPointerException("FacesConext -> null");
}
Class result = null;
if (
context == null ) {
throw new
NullPointerException();
}
try {
MethodInfo mi =
methodExpression.
getMethodInfo(
context.
getELContext());
result =
mi.
getReturnType();
}
catch (javax.el.
PropertyNotFoundException e) {
throw new javax.faces.el.
MethodNotFoundException(
e);
}
catch (javax.el.
MethodNotFoundException e) {
throw new javax.faces.el.
MethodNotFoundException(
e);
}
catch (
ELException e) {
throw new javax.faces.el.
MethodNotFoundException(
e);
}
return
result;
}
public
String getExpressionString() {
assert(null !=
methodExpression);
return
methodExpression.
getExpressionString();
}
public boolean
equals(
Object other) {
if (this ==
other) {
return true;
}
if (
other instanceof
MethodBindingMethodExpressionAdapter) {
return
methodExpression.
equals(((
MethodBindingMethodExpressionAdapter)
other).
getWrapped());
} else if (
other instanceof
MethodBinding) {
MethodBinding binding = (
MethodBinding)
other;
// We'll need to do a little leg work to determine
// if the MethodBinding is equivalent to the
// wrapped MethodExpression
String expr =
binding.
getExpressionString();
int
idx =
expr.
indexOf('.');
String target =
expr.
substring(0,
idx).
substring(2);
String t =
expr.
substring(
idx + 1);
String method =
t.
substring(0, (
t.
length() - 1));
FacesContext context =
FacesContext.
getCurrentInstance();
ELContext elContext =
context.
getELContext();
MethodInfo controlInfo =
methodExpression.
getMethodInfo(
elContext);
// ensure the method names are the same
if (!
controlInfo.
getName().
equals(
method)) {
return false;
}
// Using the target, create an expression and evaluate
// it.
ExpressionFactory factory =
context.
getApplication().
getExpressionFactory();
ValueExpression ve =
factory.
createValueExpression(
elContext,
"#{" +
target + '}',
Object.class);
if (
ve == null) {
return false;
}
Object result =
ve.
getValue(
elContext);
if (
result == null) {
return false;
}
// Get all of the methods with the matching name and try
// to find a match based on controlInfo's return and parameter
// types
Class type =
binding.
getType(
context);
Method[]
methods =
result.
getClass().
getMethods();
for (
Method meth :
methods) {
if (
meth.
getName().
equals(
method)
&&
type.
equals(
controlInfo.
getReturnType())
&&
Arrays.
equals(
meth.
getParameterTypes(),
controlInfo.
getParamTypes())) {
return true;
}
}
}
return false;
}
public int
hashCode() {
assert(null !=
methodExpression);
return
methodExpression.
hashCode();
}
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 (
methodExpression instanceof
StateHolder) {
Object []
stateStruct = new
Object[2];
// save the actual state of our wrapped methodExpression
stateStruct[0] = ((
StateHolder)
methodExpression).
saveState(
context);
// save the class name of the methodExpression impl
stateStruct[1] =
methodExpression.
getClass().
getName();
result =
stateStruct;
}
else {
result =
methodExpression;
}
}
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
MethodExpression)) {
Object []
stateStruct = (
Object [])
state;
Object savedState =
stateStruct[0];
String className =
stateStruct[1].
toString();
MethodExpression 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 =
(
MethodExpression)
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);
}
methodExpression =
result;
}
}
else {
methodExpression = (
MethodExpression)
state;
}
}
public
MethodExpression getWrapped() {
return
methodExpression;
}
//
// 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);
}
}