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 }