/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at packager/legal/LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." If you don't indicate a single choice of license, a * recipient has the option to distribute your version of this file under * either the CDDL, the GPL Version 2 or to extend the choice of license to * its licensees as provided above. However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ 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.PropertyNotFoundException; import javax.faces.el.ValueBinding; import javax.el.ValueExpression; import javax.el.ELException; /** *

Wrap a ValueExpression instance and expose it as a ValueBinding

* * @author Jacob Hookom */ class ValueBindingValueExpressionAdapter extends ValueBinding implements StateHolder, Serializable { private static final long serialVersionUID = -8015491904782686906L; private ValueExpression valueExpression= null; private boolean tranzient; public ValueBindingValueExpressionAdapter() {} // for StateHolder ValueBindingValueExpressionAdapter(ValueExpression valueExpression) { this.valueExpression = valueExpression; } /* (non-Javadoc) * @see javax.faces.el.ValueBinding#getExpressionString() */ public String getExpressionString() { assert(null != valueExpression); return valueExpression.getExpressionString(); } /* (non-Javadoc) * @see javax.faces.el.ValueBinding#getType(javax.faces.context.FacesContext) */ public Class getType(FacesContext context) throws EvaluationException, PropertyNotFoundException { if (context == null) { throw new NullPointerException("FacesContext -> null"); } Class result = null; try { result = valueExpression.getType(context.getELContext()); } catch (javax.el.PropertyNotFoundException pnfe) { throw new PropertyNotFoundException(pnfe); } catch (ELException elex) { throw new EvaluationException(elex); } return result; } /* (non-Javadoc) * @see javax.faces.el.ValueBinding#getValue(javax.faces.context.FacesContext) */ public Object getValue(FacesContext context) throws EvaluationException, PropertyNotFoundException { if (context == null) { throw new NullPointerException("FacesContext -> null"); } Object result = null; try { result = valueExpression.getValue(context.getELContext()); } catch (javax.el.PropertyNotFoundException pnfe) { throw new PropertyNotFoundException(pnfe); } catch (ELException elex) { throw new EvaluationException(elex); } return result; } /* (non-Javadoc) * @see javax.faces.el.ValueBinding#isReadOnly(javax.faces.context.FacesContext) */ public boolean isReadOnly(FacesContext context) throws EvaluationException, PropertyNotFoundException { if (context == null) { throw new NullPointerException("FacesContext -> null"); } boolean result = false; try { result = valueExpression.isReadOnly(context.getELContext()); } catch (ELException elex) { throw new EvaluationException(elex); } return result; } /* (non-Javadoc) * @see javax.faces.el.ValueBinding#setValue(javax.faces.context.FacesContext, java.lang.Object) */ public void setValue(FacesContext context, Object value) throws EvaluationException, PropertyNotFoundException { if (context == null) { throw new NullPointerException("FacesContext -> null"); } try { valueExpression.setValue(context.getELContext(), value); } catch (javax.el.PropertyNotFoundException pnfe) { throw new PropertyNotFoundException(pnfe); } catch (javax.el.PropertyNotWritableException pnwe) { throw new PropertyNotFoundException(pnwe); } catch (ELException elex) { throw new EvaluationException(elex); } } 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 (valueExpression instanceof StateHolder) { Object [] stateStruct = new Object[2]; // save the actual state of our wrapped valueExpression stateStruct[0] = ((StateHolder)valueExpression).saveState(context); // save the class name of the valueExpression impl stateStruct[1] = valueExpression.getClass().getName(); result = stateStruct; } else { result = valueExpression; } } 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 ValueExpression)) { Object [] stateStruct = (Object []) state; Object savedState = stateStruct[0]; String className = stateStruct[1].toString(); ValueExpression 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 = (ValueExpression) 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); } valueExpression = result; } } else { valueExpression = (ValueExpression) state; } } public boolean equals(Object other) { if (other == this) { return true; } if (other instanceof ValueBindingValueExpressionAdapter) { ValueExpression expr = ((ValueBindingValueExpressionAdapter) other).getWrapped(); return (valueExpression.equals(expr)); } else if (other instanceof ValueBinding) { FacesContext context = FacesContext.getCurrentInstance(); ValueBinding otherVB = (ValueBinding) other; Class type = otherVB.getType(context); if (type != null) { return type.equals(valueExpression.getType(context.getELContext())); } } return false; } public int hashCode() { assert(null != valueExpression); return valueExpression.hashCode(); } public ValueExpression getWrapped() { return valueExpression; } // // 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); } }