| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| EmptyOperator |
|
| 5.333333333333333;5.333 |
| 1 | /* | |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
| 3 | * contributor license agreements. See the NOTICE file distributed with | |
| 4 | * this work for additional information regarding copyright ownership. | |
| 5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
| 6 | * (the "License"); you may not use this file except in compliance with | |
| 7 | * the License. You may obtain a copy of the License at | |
| 8 | * | |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 | * | |
| 11 | * Unless required by applicable law or agreed to in writing, software | |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 | * See the License for the specific language governing permissions and | |
| 15 | * limitations under the License. | |
| 16 | */ | |
| 17 | package org.apache.commons.el; | |
| 18 | ||
| 19 | import java.lang.reflect.Array; | |
| 20 | import java.util.Collection; | |
| 21 | import java.util.Map; | |
| 22 | ||
| 23 | import javax.servlet.jsp.el.ELException; | |
| 24 | ||
| 25 | /** | |
| 26 | * | |
| 27 | * <p>The implementation of the empty operator | |
| 28 | * | |
| 29 | * @author Nathan Abramson - Art Technology Group | |
| 30 | * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: bayard $ | |
| 31 | **/ | |
| 32 | ||
| 33 | public class EmptyOperator | |
| 34 | extends UnaryOperator | |
| 35 | { | |
| 36 | //------------------------------------- | |
| 37 | // Singleton | |
| 38 | //------------------------------------- | |
| 39 | ||
| 40 | 0 | public static final EmptyOperator SINGLETON = |
| 41 | new EmptyOperator (); | |
| 42 | ||
| 43 | //------------------------------------- | |
| 44 | /** | |
| 45 | * | |
| 46 | * Constructor | |
| 47 | **/ | |
| 48 | public EmptyOperator () | |
| 49 | 0 | { |
| 50 | 0 | } |
| 51 | ||
| 52 | //------------------------------------- | |
| 53 | // Expression methods | |
| 54 | //------------------------------------- | |
| 55 | /** | |
| 56 | * | |
| 57 | * Returns the symbol representing the operator | |
| 58 | **/ | |
| 59 | public String getOperatorSymbol () | |
| 60 | { | |
| 61 | 0 | return "empty"; |
| 62 | } | |
| 63 | ||
| 64 | //------------------------------------- | |
| 65 | /** | |
| 66 | * | |
| 67 | * Applies the operator to the given value | |
| 68 | **/ | |
| 69 | public Object apply (Object pValue) | |
| 70 | throws ELException | |
| 71 | { | |
| 72 | // See if the value is null | |
| 73 | 0 | if (pValue == null) { |
| 74 | 0 | return PrimitiveObjects.getBoolean (true); |
| 75 | } | |
| 76 | ||
| 77 | // See if the value is a zero-length String | |
| 78 | 0 | else if ("".equals (pValue)) { |
| 79 | 0 | return PrimitiveObjects.getBoolean (true); |
| 80 | } | |
| 81 | ||
| 82 | // See if the value is a zero-length array | |
| 83 | 0 | else if (pValue.getClass ().isArray () && |
| 84 | Array.getLength (pValue) == 0) { | |
| 85 | 0 | return PrimitiveObjects.getBoolean (true); |
| 86 | } | |
| 87 | ||
| 88 | // See if the value is an empty Map | |
| 89 | 0 | else if (pValue instanceof Map && |
| 90 | ((Map) pValue).isEmpty ()) { | |
| 91 | 0 | return PrimitiveObjects.getBoolean (true); |
| 92 | } | |
| 93 | ||
| 94 | // See if the value is an empty Collection | |
| 95 | 0 | else if (pValue instanceof Collection && |
| 96 | ((Collection) pValue).isEmpty ()) { | |
| 97 | 0 | return PrimitiveObjects.getBoolean (true); |
| 98 | } | |
| 99 | ||
| 100 | // Otherwise, not empty | |
| 101 | else { | |
| 102 | 0 | return PrimitiveObjects.getBoolean (false); |
| 103 | } | |
| 104 | } | |
| 105 | ||
| 106 | //------------------------------------- | |
| 107 | } |