All Downloads are FREE. Search and download functionalities are using the official Maven repository.

javax.faces.component.ValueExpressionValueBindingAdapter Maven / Gradle / Ivy

/*
 * 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 javax.el.ValueExpression;
import javax.el.ELException;
import javax.el.ELContext;
import javax.faces.el.ValueBinding;
import javax.faces.context.FacesContext;
import javax.faces.component.StateHolder;

import java.io.Serializable;

/**
 * 

Wrap a ValueBinding instance and expose it as a * ValueExpression.

*/ class ValueExpressionValueBindingAdapter extends ValueExpression implements Serializable, StateHolder { private static final long serialVersionUID = 2388977392466671243L; public ValueExpressionValueBindingAdapter() {} private ValueBinding binding = null; ValueExpressionValueBindingAdapter(ValueBinding binding) { assert(null != binding); this.binding = binding; } // // Methods from ValueExpression // public Object getValue(ELContext context) throws ELException { assert(null != binding); if (context == null) { throw new NullPointerException("ELContext -> null"); } Object result = null; FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class); assert(null != facesContext); try { result = binding.getValue(facesContext); } catch (Throwable e) { throw new ELException(e); } return result; } public void setValue(ELContext context, Object value) throws ELException { assert(null != binding); if (context == null) { throw new NullPointerException("ELContext -> null"); } FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class); assert(null != facesContext); try { binding.setValue(facesContext, value); } catch (Throwable e) { throw new ELException(e); } } public boolean isReadOnly(ELContext context) throws ELException { assert(null != binding); if (context == null) { throw new NullPointerException("ELContext -> null"); } boolean result = false; FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class); assert(null != facesContext); try { result = binding.isReadOnly(facesContext); } catch (Throwable e) { throw new ELException(e); } return result; } public Class getType(ELContext context) throws ELException { assert(null != binding); if (context == null) { throw new NullPointerException("ELContext -> null"); } Class result = null; FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class); assert(null != facesContext); try { result = binding.getType(facesContext); } catch (Throwable e) { throw new ELException(e); } return result; } /** *

Always return false since we can't possibly know * if this is a literal text binding or not.

*/ public boolean isLiteralText() { return false; } public Class getExpectedType() { assert(null != binding); Class result = null; FacesContext context = FacesContext.getCurrentInstance(); try { Object value = binding.getValue(context); result = value.getClass(); } catch (Throwable e) { result = null; } return result; } public String getExpressionString() { assert(null != binding); return binding.getExpressionString(); } public boolean equals(Object other) { if (other == this) { return true; } if (other instanceof ValueExpressionValueBindingAdapter) { ValueBinding vb = ((ValueExpressionValueBindingAdapter) other).getWrapped(); return (binding.equals(vb)); } else if (other instanceof ValueExpression) { FacesContext context = FacesContext.getCurrentInstance(); ValueExpression otherVE = (ValueExpression) other; Class type = binding.getType(context); if (type != null) { return type.equals(otherVE.getType(context.getELContext())); } } return false; } public int hashCode() { assert(null != binding); return binding.hashCode(); } public String getDelimiterSyntax() { // PENDING (visvan) Implementation return ""; } // // Methods from StateHolder // public Object saveState(FacesContext context) { if (context == null) { throw new NullPointerException(); } 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 (context == null) { throw new NullPointerException(); } // if we have state if (null == state) { return; } if (!(state instanceof ValueBinding)) { Object [] stateStruct = (Object []) state; Object savedState = stateStruct[0]; String className = stateStruct[1].toString(); ValueBinding 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 = (ValueBinding) 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 = (ValueBinding) state; } } private boolean tranzient = false; public boolean isTransient() { return tranzient; } public void setTransient(boolean newTransientValue) { tranzient = newTransientValue; } // // 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); } // // methods used by classes aware of this class's wrapper nature // public ValueBinding getWrapped() { return binding; } }




© 2015 - 2024 Weber Informatics LLC | Privacy Policy