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This is the master POM file for Sun's Implementation of the JSF 2.1 Specification.

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package javax.faces.component;

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 = 6470180891722042701L; 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) { 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); } }




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