001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.svl.vars;
018
019import static org.apache.juneau.commons.utils.Utils.*;
020
021import org.apache.juneau.svl.*;
022
023/**
024 * Upper-case variable resolver.
025 *
026 * <p>
027 * The format for this var is <js>"$NE{stringValue}"</js>.
028 *
029 * <p>
030 * This variable returns <js>"true"</js> if the contents are not empty.
031 *
032 * <p>
033 * Since this is a {@link SimpleVar}, any variables contained in the result will be recursively resolved.
034 * Likewise, if the arguments contain any variables, those will be resolved before they are passed to this var.
035 *
036 * <h5 class='section'>See Also:</h5><ul>
037 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/SimpleVariableLanguageBasics">Simple Variable Language Basics</a>
038 * </ul>
039 */
040public class NotEmptyVar extends SimpleVar {
041
042   /** The name of this variable. */
043   public static final String NAME = "NE";
044
045   /**
046    * Constructor.
047    */
048   public NotEmptyVar() {
049      super(NAME);
050   }
051
052   @Override /* Overridden from Parameter */
053   public String resolve(VarResolverSession session, String key) {
054      return String.valueOf(nb(key));
055   }
056}