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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 java.io.Serializable;

import javax.faces.component.StateHolder;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.MethodBinding;

import javax.el.MethodExpression;
import javax.el.MethodInfo;
import javax.el.ELException;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;

import java.util.Arrays;
import java.lang.reflect.Method;

/**
 * 

Wrap a MethodExpression instance and expose it as a MethodBinding

* */ class MethodBindingMethodExpressionAdapter extends MethodBinding implements StateHolder, Serializable { private static final long serialVersionUID = 7334926223014401689L; private MethodExpression methodExpression= null; private boolean tranzient; public MethodBindingMethodExpressionAdapter() {} // for StateHolder 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("FacesConext -> null"); } 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) { Throwable cause = e.getCause(); if (cause == null) { 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); if (context == null) { throw new NullPointerException("FacesConext -> null"); } 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) { if (this == other) { return true; } if (other instanceof MethodBindingMethodExpressionAdapter) { return methodExpression.equals(((MethodBindingMethodExpressionAdapter) other).getWrapped()); } else if (other instanceof MethodBinding) { MethodBinding binding = (MethodBinding) 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 = methodExpression.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 Class type = binding.getType(context); Method[] methods = result.getClass().getMethods(); for (Method meth : methods) { if (meth.getName().equals(method) && type.equals(controlInfo.getReturnType()) && Arrays.equals(meth.getParameterTypes(), controlInfo.getParamTypes())) { return true; } } } return false; } 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){ if (context == null) { throw new NullPointerException(); } 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 (context == null) { throw new NullPointerException(); } // 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; } } public MethodExpression getWrapped() { return methodExpression; } // // 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); } }




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