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package javax.faces.component;
import javax.el.
MethodExpression;
import javax.el.
ELException;
import javax.el.
ELContext;
import javax.el.
MethodInfo;
import javax.faces.el.
MethodBinding;
import javax.faces.context.
FacesContext;
import javax.faces.component.
StateHolder;
import javax.el.
ExpressionFactory;
import javax.el.
ValueExpression;
import java.util.
Arrays;
import java.lang.reflect.
Method;
import java.io.
Serializable;
/**
* <p>Wrap a MethodBinding instance and expose it as a
* MethodExpression.</p>
*/
class
MethodExpressionMethodBindingAdapter extends
MethodExpression implements
Serializable,
StateHolder {
private static final long
serialVersionUID = -1822420567946048452L;
public
MethodExpressionMethodBindingAdapter() {} // for StateHolder
private
MethodBinding binding = null;
MethodExpressionMethodBindingAdapter(
MethodBinding binding) {
assert(null !=
binding);
this.
binding =
binding;
}
//
// Methods from MethodExpression
//
private transient
MethodInfo info = null;
public
MethodInfo getMethodInfo(
ELContext context) throws
ELException {
assert(null !=
binding);
if (
context == null) {
throw new
NullPointerException("ELContext -> null");
}
if (null ==
info) {
FacesContext facesContext = (
FacesContext)
context.
getContext(
FacesContext.class);
if (null !=
facesContext) {
try {
//PENDING - we should find a way to provide more information
info = new
MethodInfo(null,
binding.
getType(
facesContext), null);
}
catch (
Exception e) {
throw new
ELException(
e);
}
}
}
return
info;
}
public
Object invoke(
ELContext context,
Object[]
params) throws
ELException {
assert(null !=
binding);
if (
context == null) {
throw new
NullPointerException("ELContext -> null");
}
Object result = null;
FacesContext facesContext = (
FacesContext)
context.
getContext(
FacesContext.class);
if (null !=
facesContext) {
try {
result =
binding.
invoke(
facesContext,
params);
}
catch (
Exception e) {
throw new
ELException(
e);
}
}
return
result;
}
public
String getExpressionString() {
assert(null !=
binding);
return
binding.
getExpressionString();
}
public boolean
isLiteralText() {
assert (
binding != null);
String expr =
binding.
getExpressionString();
return (!(
expr.
startsWith("#{")
&&
expr.
endsWith("}")));
}
public boolean
equals(
Object other) {
if (
other == this) {
return true;
}
if (
other instanceof
MethodExpressionMethodBindingAdapter) {
MethodBinding ob = ((
MethodExpressionMethodBindingAdapter)
other).
getWrapped();
return (
binding.
equals(
ob));
} else if (
other instanceof
MethodExpression) {
MethodExpression expression = (
MethodExpression)
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 =
expression.
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
Method[]
methods =
result.
getClass().
getMethods();
for (
Method meth :
methods) {
if (
meth.
getName().
equals(
method)
&&
meth.
getReturnType().
equals(
controlInfo.
getReturnType())
&&
Arrays.
equals(
meth.
getParameterTypes(),
controlInfo.
getParamTypes())) {
return true;
}
}
}
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
MethodBinding)) {
Object []
stateStruct = (
Object [])
state;
Object savedState =
stateStruct[0];
String className =
stateStruct[1].
toString();
MethodBinding 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 =
(
MethodBinding)
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 = (
MethodBinding)
state;
}
}
private boolean
tranzient = false;
public boolean
isTransient() {
return
tranzient;
}
public void
setTransient(boolean
newTransientMethod) {
tranzient =
newTransientMethod;
}
//
// 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
MethodBinding getWrapped() {
return
binding;
}
}