com.sun.webui.jsf.util.MethodBindingMethodExpressionAdapter Maven / Gradle / Ivy
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/*
* $Id: MethodBindingMethodExpressionAdapter.java,v 1.1 2007-02-16 01:50:18 bob_yennaco Exp $
*/
package com.sun.webui.jsf.util;
import java.io.Serializable;
import javax.faces.component.StateHolder;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.ReferenceSyntaxException;
import javax.faces.el.MethodBinding;
import javax.el.MethodExpression;
import javax.el.MethodInfo;
import javax.el.ELException;
/**
* Wrap a MethodExpression instance and expose it as a MethodBinding
*
*/
public class MethodBindingMethodExpressionAdapter extends MethodBinding implements StateHolder,
Serializable {
private static final long serialVersionUID = 7334926223014401689L;
private MethodExpression methodExpression= null;
private boolean tranzient;
public MethodBindingMethodExpressionAdapter() {} // for StateHolder
public 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();
}
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) {
// look for the root cause and pass that to the
// ctor of EvaluationException
Throwable cause = e.getCause();
if (cause != null) {
while (cause.getCause() != null) {
cause = cause.getCause();
}
} else {
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);
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) {
assert(null != methodExpression);
boolean result = false;
// don't bother even trying to compare, if we're not assignment
// compatabile with "other"
if (MethodExpression.class.isAssignableFrom(other.getClass())) {
MethodExpression otherVE = (MethodExpression) other;
result = this.getExpressionString().equals(otherVE.getExpressionString());
}
return result;
}
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){
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 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;
}
}
//
// 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 loader.loadClass(name);
}
}