com.sun.webui.jsf.util.MethodExpressionMethodBindingAdapter Maven / Gradle / Ivy
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/*
* $Id: MethodExpressionMethodBindingAdapter.java,v 1.1 2007-02-16 01:50:26 bob_yennaco Exp $
*/
package com.sun.webui.jsf.util;
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 java.io.Serializable;
/**
* Wrap a MethodBinding instance and expose it as a
* MethodExpression.
*/
public class MethodExpressionMethodBindingAdapter extends MethodExpression implements Serializable, StateHolder {
private static final long serialVersionUID = -1822420567946048452L;
public MethodExpressionMethodBindingAdapter() {} // for StateHolder
private MethodBinding binding = null;
public 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 (null == info) {
FacesContext facesContext = (FacesContext)
context.getContext(FacesContext.class);
if (null != facesContext) {
try {
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);
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) {
assert(null != binding);
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 != binding);
return binding.hashCode();
}
public String getDelimiterSyntax() {
// PENDING (visvan) Implementation
return "";
}
//
// Methods from StateHolder
//
public Object saveState(FacesContext context) {
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 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 loader.loadClass(name);
}
//
// methods used by classes aware of this class's wrapper nature
//
public MethodBinding getWrapped() {
return binding;
}
}