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.examples.core.svl;
018
019import org.apache.juneau.svl.*;
020
021/**
022 * Simple Variable Language examples.
023 *
024 */
025public class SvlExample {
026
027   /**
028    * Main method.
029    *
030    * @param args Unused.
031    */
032   public static void main(String[] args) {
033
034      var vr = VarResolver.DEFAULT;
035
036      // $E{key[,default]} for getting environment variables
037      System.out.println(vr.resolve("JAVA_HOME=$E{JAVA_HOME, not defined}"));
038
039      // $S{key[,default]} for getting system properties (uses System.getProperty() )
040      System.out.println(vr.resolve("os.name=$S{os.name, not defined}"));
041
042      // $IF{key[,default]} general if or if-else condition
043      // $NE{arg} will return true if not empty
044      System.out.println(vr.resolve("TEST_VAR is $IF{$NE{$E{TEST_VAR}}, not empty, empty}"));
045
046      // $SW{arg,pattern1:then1[,pattern2:then2...]} switch-case
047      System.out.println(vr.resolve("$SW{Carrot, *Ap*:Fruit, *Car*:Veg, *:N/A}"));
048
049      // $PR{arg,pattern,replace} pattern replace
050      System.out.println(vr.resolve("Java version=$PR{$S{java.version}, (_([0-9]+)), \\ build=\\$2}"));
051
052      // $UC{arg} uppercase $LC{arg} lowecase
053      System.out.println(vr.resolve("$LC{JAVA_HOME} $UC{$E{JAVA_HOME}}"));
054
055      // $LN{arg[,delimiter]} length var example
056      System.out.println(vr.resolve("parts = $LN{$S{os.version},.}, charcount = $LN{$S{os.version}}"));
057
058      // $ST{arg,start[,end]} substring var example
059      System.out.println(vr.resolve("version = $ST{$S{java.version}, 0, 3}"));
060
061      // $PE{arg,start[,end]} pattern extractor var example
062      System.out.println(vr.resolve("update = $PE{$S{java.version},_([0-9]+),1}"));
063
064      /*
065       *  See all supported variable types at,
066       *  http://juneau.apache.org/site/apidocs-8.0.0/overview-summary.html#juneau-marshall.SimpleVariableLanguage
067       *  NOTE - juneau-marshall.SimpleVariableLanguage supports nested variables well
068       * */
069   }
070}