| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package javax.faces.component; |
| |
| import javax.el.ELContext; |
| import javax.el.ELException; |
| import javax.el.MethodExpression; |
| import javax.el.MethodInfo; |
| import javax.el.MethodNotFoundException; |
| import javax.el.PropertyNotFoundException; |
| import javax.faces.context.FacesContext; |
| import javax.faces.el.EvaluationException; |
| import javax.faces.el.MethodBinding; |
| |
| /** |
| * Converts a MethodBinding to a MethodExpression |
| * |
| * TODO: find a way to share the implementation of class with impl. |
| * |
| * @author Stan Silvert |
| */ |
| @SuppressWarnings("deprecation") |
| class _MethodBindingToMethodExpression extends MethodExpression implements StateHolder |
| { |
| private static final Class[] EXPECTED_TYPES = new Class[] { MethodBinding.class, StateHolder.class }; |
| |
| private MethodBinding methodBinding; |
| |
| private boolean _transientFlag; |
| |
| private transient MethodInfo methodInfo; |
| |
| /** |
| * No-arg constructor used during restoreState |
| */ |
| protected _MethodBindingToMethodExpression() |
| { |
| } |
| |
| /** Creates a new instance of MethodBindingToMethodExpression */ |
| public _MethodBindingToMethodExpression(MethodBinding methodBinding) |
| { |
| checkNullArgument(methodBinding, "methodBinding"); |
| this.methodBinding = methodBinding; |
| } |
| |
| /** |
| * Return the wrapped MethodBinding. |
| */ |
| public MethodBinding getMethodBinding() |
| { |
| return methodBinding; |
| } |
| |
| void setMethodBinding(MethodBinding methodBinding) |
| { |
| this.methodBinding = methodBinding; |
| } |
| |
| /** |
| * Note: MethodInfo.getParamTypes() may incorrectly return an empty class array if invoke() has not been called. |
| * |
| * @throws IllegalStateException |
| * if expected params types have not been determined. |
| */ |
| public MethodInfo getMethodInfo(ELContext context) throws PropertyNotFoundException, MethodNotFoundException, |
| ELException |
| { |
| checkNullArgument(context, "elcontext"); |
| checkNullState(methodBinding, "methodBinding"); |
| |
| if (methodInfo == null) |
| { |
| final FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class); |
| if (facesContext != null) |
| { |
| methodInfo = invoke(new Invoker<MethodInfo>() |
| { |
| public MethodInfo invoke() |
| { |
| return new MethodInfo(null, methodBinding.getType(facesContext), null); |
| } |
| }); |
| } |
| } |
| return methodInfo; |
| } |
| |
| public Object invoke(ELContext context, final Object[] params) throws PropertyNotFoundException, |
| MethodNotFoundException, ELException |
| { |
| checkNullArgument(context, "elcontext"); |
| checkNullState(methodBinding, "methodBinding"); |
| final FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class); |
| if (facesContext != null) |
| { |
| return invoke(new Invoker<Object>() |
| { |
| public Object invoke() |
| { |
| return methodBinding.invoke(facesContext, params); |
| } |
| }); |
| } |
| return null; |
| } |
| |
| public boolean isLiteralText() |
| { |
| if (methodBinding == null) |
| throw new IllegalStateException("methodBinding is null"); |
| String expr = methodBinding.getExpressionString(); |
| return !(expr.startsWith("#{") && expr.endsWith("}")); |
| } |
| |
| public String getExpressionString() |
| { |
| return methodBinding.getExpressionString(); |
| } |
| |
| public Object saveState(FacesContext context) |
| { |
| if (!isTransient()) |
| { |
| if (methodBinding instanceof StateHolder) |
| { |
| Object[] state = new Object[2]; |
| state[0] = methodBinding.getClass().getName(); |
| state[1] = ((StateHolder) methodBinding).saveState(context); |
| return state; |
| } |
| else |
| { |
| return methodBinding; |
| } |
| } |
| return null; |
| } |
| |
| public void restoreState(FacesContext context, Object state) |
| { |
| if (state instanceof MethodBinding) |
| { |
| methodBinding = (MethodBinding) state; |
| methodInfo = null; |
| } |
| else if (state != null) |
| { |
| Object[] values = (Object[]) state; |
| methodBinding = (MethodBinding) _ClassUtils.newInstance(values[0].toString(), EXPECTED_TYPES); |
| ((StateHolder) methodBinding).restoreState(context, values[1]); |
| methodInfo = null; |
| } |
| } |
| |
| public void setTransient(boolean transientFlag) |
| { |
| _transientFlag = transientFlag; |
| } |
| |
| public boolean isTransient() |
| { |
| return _transientFlag; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| final int PRIME = 31; |
| int result = 1; |
| result = PRIME * result + ((methodBinding == null) ? 0 : methodBinding.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) |
| { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| final _MethodBindingToMethodExpression other = (_MethodBindingToMethodExpression) obj; |
| if (methodBinding == null) |
| { |
| if (other.methodBinding != null) |
| return false; |
| } |
| else if (!methodBinding.equals(other.methodBinding)) |
| return false; |
| return true; |
| } |
| |
| private void checkNullState(Object notNullInstance, String instanceName) |
| { |
| if (notNullInstance == null) |
| throw new IllegalStateException(instanceName + " is null"); |
| } |
| |
| private void checkNullArgument(Object notNullInstance, String instanceName) |
| { |
| if (notNullInstance == null) |
| throw new IllegalArgumentException(instanceName + " is null"); |
| } |
| |
| private <T> T invoke(Invoker<T> invoker) |
| { |
| try |
| { |
| return invoker.invoke(); |
| } |
| catch (javax.faces.el.MethodNotFoundException e) |
| { |
| throw new MethodNotFoundException(e.getMessage(), e); |
| } |
| catch (EvaluationException e) |
| { |
| throw new ELException(e.getMessage(), e); |
| } |
| } |
| |
| private interface Invoker<T> |
| { |
| T invoke(); |
| } |
| } |