001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.hadoop.lib.wsrs; 019 020 import org.apache.hadoop.classification.InterfaceAudience; 021 022 import java.text.MessageFormat; 023 import java.util.regex.Pattern; 024 025 @InterfaceAudience.Private 026 public abstract class StringParam extends Param<String> { 027 private Pattern pattern; 028 029 public StringParam(String name, String defaultValue) { 030 this(name, defaultValue, null); 031 } 032 033 public StringParam(String name, String defaultValue, Pattern pattern) { 034 super(name, defaultValue); 035 this.pattern = pattern; 036 parseParam(defaultValue); 037 } 038 039 @Override 040 public String parseParam(String str) { 041 try { 042 if (str != null) { 043 str = str.trim(); 044 if (str.length() > 0) { 045 value = parse(str); 046 } 047 } 048 } catch (Exception ex) { 049 throw new IllegalArgumentException( 050 MessageFormat.format("Parameter [{0}], invalid value [{1}], value must be [{2}]", 051 getName(), str, getDomain())); 052 } 053 return value; 054 } 055 056 @Override 057 protected String parse(String str) throws Exception { 058 if (pattern != null) { 059 if (!pattern.matcher(str).matches()) { 060 throw new IllegalArgumentException("Invalid value"); 061 } 062 } 063 return str; 064 } 065 066 @Override 067 protected String getDomain() { 068 return (pattern == null) ? "a string" : pattern.pattern(); 069 } 070 }