| /* |
| * 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 org.apache.myfaces.test.el; |
| |
| import javax.el.ELContext; |
| import javax.el.ELResolver; |
| import javax.el.ValueExpression; |
| import javax.faces.context.FacesContext; |
| |
| /** |
| * <p>Mock implementation of <code>ValueExpression</code>.</p> |
| * |
| * <p>This implementation supports a limited subset of overall expression functionality:</p> |
| * <ul> |
| * <li>A literal string that contains no expression delimiters.</li> |
| * <li>An expression that starts with "#{" or "${", and ends with "}".</li> |
| * </ul> |
| * |
| * @since 1.0.0 |
| */ |
| public class MockValueExpression extends ValueExpression |
| { |
| |
| // ------------------------------------------------------------ Constructors |
| |
| /** |
| * Serial version UID. |
| */ |
| private static final long serialVersionUID = -8649071428507512623L; |
| |
| /** |
| * <p>Construct a new expression for the specified expression string.</p> |
| * |
| * @param expression Expression string to be evaluated |
| * @param expectedType Expected type of the result |
| */ |
| public MockValueExpression(String expression, Class expectedType) |
| { |
| |
| if (expression == null) |
| { |
| throw new NullPointerException("Expression string cannot be null"); |
| } |
| this.expression = expression; |
| this.expectedType = expectedType; |
| parse(); |
| |
| } |
| |
| // ------------------------------------------------------ Instance Variables |
| |
| /** |
| * <p>The parsed elements of this expression.</p> |
| */ |
| private String[] elements = null; |
| |
| /** |
| * <p>The expected result type for <code>getValue()</code> calls.</p> |
| */ |
| private Class expectedType = null; |
| |
| /** |
| * <p>The original expression string used to create this expression.</p> |
| */ |
| private String expression = null; |
| |
| // ------------------------------------------------------ Expression Methods |
| |
| /** |
| * <p>Return <code>true</code> if this expression is equal to the |
| * specified expression.</p> |
| * |
| * @param obj Object to be compared |
| */ |
| public boolean equals(Object obj) |
| { |
| |
| if ((obj != null) & (obj instanceof ValueExpression)) |
| { |
| return expression.equals(((ValueExpression) obj) |
| .getExpressionString()); |
| } |
| else |
| { |
| return false; |
| } |
| |
| } |
| |
| /** |
| * <p>Return the original String used to create this expression, |
| * unmodified.</p> |
| */ |
| public String getExpressionString() |
| { |
| |
| return this.expression; |
| |
| } |
| |
| /** |
| * <p>Return the hash code for this expression.</p> |
| */ |
| public int hashCode() |
| { |
| |
| return this.expression.hashCode(); |
| |
| } |
| |
| /** |
| * <p>Return <code>true</code> if the expression string for this expression |
| * contains only literal text.</p> |
| */ |
| public boolean isLiteralText() |
| { |
| |
| return (expression.indexOf("${") < 0) && (expression.indexOf("#{") < 0); |
| |
| } |
| |
| // ------------------------------------------------- ValueExpression Methods |
| |
| /** |
| * <p>Return the type that the result of this expression will |
| * be coerced to.</p> |
| */ |
| public Class getExpectedType() |
| { |
| |
| return this.expectedType; |
| |
| } |
| |
| /** |
| * <p>Evaluate this expression relative to the specified context, |
| * and return the most general type that is acceptable for the |
| * value passed in a <code>setValue()</code> call.</p> |
| * |
| * @param context ELContext for this evaluation |
| */ |
| public Class getType(ELContext context) |
| { |
| |
| if (context == null) |
| { |
| throw new NullPointerException(); |
| } |
| Object value = getValue(context); |
| if (value == null) |
| { |
| if (isLiteralText()) |
| { |
| return String.class; |
| } |
| |
| ELResolver resolver = context.getELResolver(); |
| Object base = null; |
| for (int i = 0; i < elements.length - 1; i++) |
| { |
| base = resolver.getValue(context, base, elements[i]); |
| } |
| return resolver.getType(context, base, elements[elements.length - 1]); |
| } |
| else |
| { |
| return value.getClass(); |
| } |
| } |
| |
| /** |
| * <p>Evaluate this expression relative to the specified context, |
| * and return the result.</p> |
| * |
| * @param context ELContext for this evaluation |
| */ |
| public Object getValue(ELContext context) |
| { |
| |
| if (context == null) |
| { |
| throw new NullPointerException(); |
| } |
| if (isLiteralText()) |
| { |
| return expression; |
| } |
| |
| FacesContext fcontext = (FacesContext) context |
| .getContext(FacesContext.class); |
| |
| ELResolver resolver = context.getELResolver(); |
| Object base = null; |
| for (int i = 0; i < elements.length; i++) |
| { |
| base = resolver.getValue(context, base, elements[i]); |
| } |
| return fcontext.getApplication().getExpressionFactory().coerceToType( |
| base, getExpectedType()); |
| |
| } |
| |
| /** |
| * <p>Evaluate this expression relative to the specified context, |
| * and return <code>true</code> if a call to <code>setValue()</code> |
| * will always fail.</p> |
| * |
| * @param context ELContext for this evaluation |
| */ |
| public boolean isReadOnly(ELContext context) |
| { |
| |
| if (context == null) |
| { |
| throw new NullPointerException(); |
| } |
| if (isLiteralText()) |
| { |
| return true; |
| } |
| |
| ELResolver resolver = context.getELResolver(); |
| Object base = null; |
| for (int i = 0; i < elements.length - 1; i++) |
| { |
| base = resolver.getValue(context, base, elements[i]); |
| } |
| return resolver |
| .isReadOnly(context, base, elements[elements.length - 1]); |
| |
| } |
| |
| /** |
| * <p>Evaluate this expression relative to the specified context, |
| * and set the result to the specified value.</p> |
| * |
| * @param context ELContext for this evaluation |
| * @param value Value to which the result should be set |
| */ |
| public void setValue(ELContext context, Object value) |
| { |
| |
| if (context == null) |
| { |
| throw new NullPointerException(); |
| } |
| |
| ELResolver resolver = context.getELResolver(); |
| Object base = null; |
| for (int i = 0; i < elements.length - 1; i++) |
| { |
| base = resolver.getValue(context, base, elements[i]); |
| } |
| resolver.setValue(context, base, elements[elements.length - 1], value); |
| |
| } |
| |
| // --------------------------------------------------------- Private Methods |
| |
| /** |
| * <p>Parse the expression string into its constituent elemetns.</p> |
| */ |
| private void parse() |
| { |
| |
| if (isLiteralText()) |
| { |
| elements = new String[0]; |
| return; |
| } |
| |
| if (expression.startsWith("${") || expression.startsWith("#{")) |
| { |
| if (expression.endsWith("}")) |
| { |
| elements = ExpressionTokenizer.tokenize(expression.substring(2, expression.length() - 1)); |
| } |
| else |
| { |
| throw new IllegalArgumentException(expression); |
| } |
| } |
| else |
| { |
| throw new IllegalArgumentException(expression); |
| } |
| |
| } |
| |
| } |