001    /**
002     * Copyright 2005-2011 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.krad.uif.util;
017    
018    import org.apache.commons.lang.StringUtils;
019    
020    /**
021     * Defines functions that can be used in el expressions within
022     * the UIF dictionary files
023     *
024     * @author Kuali Rice Team (rice.collab@kuali.org)
025     */
026    public class ExpressionFunctions {
027    
028        /**
029         * Checks whether the given class parameter is assignable from the given object class
030         * parameter
031         *
032         * @param assignableClass - class to use for assignable to
033         * @param objectClass - class to use for assignable from
034         * @return boolean true if the object class is of type assignable class, false if not
035         */
036        public static boolean isAssignableFrom(Class<?> assignableClass, Class<?> objectClass) {
037            return assignableClass.isAssignableFrom(objectClass);
038        }
039    
040        /**
041         * Checks whether the given value is null or blank string
042         *
043         * @param value - property value to check
044         * @return boolean true if value is null or blank, false if not
045         */
046        public static boolean empty(Object value) {
047            return (value == null) || (StringUtils.isBlank(value.toString()));
048        }
049    
050        /**
051         * Returns the name for the given class
052         *
053         * @param clazz - class object to return name for
054         * @return String class name or empty string if class is null
055         */
056        public static String getName(Class<?> clazz) {
057            if (clazz == null) {
058                return "";
059            } else {
060                return clazz.getName();
061            }
062        }
063    }