com.sun.faces.application.view.StateHolderSaver Maven / Gradle / Ivy
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package com.sun.faces.application.view;
import javax.faces.context.FacesContext;
import javax.faces.component.StateHolder;
import javax.faces.component.UIComponent;
import java.io.Serializable;
/**
* Helper class for saving and restoring attached objects.
*/
class StateHolderSaver implements Serializable {
private static final long serialVersionUID = 4866548262845392093L;
private String className = null;
private Serializable savedState = null;
public static final String DYNAMIC_COMPONENT =
"com.sun.faces.DynamicComponent";
private enum StateHolderTupleIndices {
StateHolderSaverInstance,
ComponentAddedDynamically,
LastMember
};
public boolean componentAddedDynamically() {
boolean result = false;
// if the Object to save implemented Serializable but not
// StateHolder
if (null == className && null != savedState) {
return result;
}
// if the Object to save did not implement Serializable or
// StateHolder
if (className == null) {
return result;
}
// else the object to save did implement StateHolder
if (null != savedState) {
// don't need to check transient, since that was done on
// the saving side.
Serializable [] tuple = (Serializable []) savedState;
result = (Boolean) tuple[StateHolderTupleIndices.ComponentAddedDynamically.ordinal()];
}
return result;
}
public StateHolderSaver(FacesContext context, Object toSave) {
if(toSave == null) {
className = null;
} else {
className = toSave.getClass().getName();
}
if (toSave instanceof StateHolder) {
// do not save an attached object that is marked transient.
if (!((StateHolder) toSave).isTransient()) {
Serializable [] tuple = new Serializable[StateHolderTupleIndices.LastMember.ordinal()];
tuple[StateHolderTupleIndices.StateHolderSaverInstance.ordinal()] =
(Serializable) ((StateHolder) toSave).saveState(context);
if (toSave instanceof UIComponent) {
tuple[StateHolderTupleIndices.ComponentAddedDynamically.ordinal()] = ((UIComponent)toSave).getAttributes().containsKey(DYNAMIC_COMPONENT) ? Boolean.TRUE : Boolean.FALSE;
}
savedState = tuple;
} else {
className = null;
}
} else if (toSave instanceof Serializable) {
savedState = (Serializable) toSave;
className = null;
}
}
/**
*
* @return the restored {@link StateHolder} instance.
*/
public Object restore(FacesContext context) throws IllegalStateException {
Object result = null;
Class toRestoreClass;
// if the Object to save implemented Serializable but not
// StateHolder
if (null == className && null != savedState) {
return savedState;
}
// if the Object to save did not implement Serializable or
// StateHolder
if (className == null) {
return null;
}
// else the object to save did implement StateHolder
try {
toRestoreClass = loadClass(className, this);
}
catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
if (null != toRestoreClass) {
try {
result = toRestoreClass.newInstance();
}
catch (InstantiationException e) {
throw new IllegalStateException(e);
}
catch (IllegalAccessException a) {
throw new IllegalStateException(a);
}
}
if (null != result && null != savedState &&
result instanceof StateHolder) {
// don't need to check transient, since that was done on
// the saving side.
Serializable [] tuple = (Serializable []) savedState;
((StateHolder) result).restoreState(context, tuple[StateHolderTupleIndices.StateHolderSaverInstance.ordinal()]);
}
return result;
}
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, false, loader);
}
}