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 */ 017 018package org.apache.commons.configuration2.web; 019 020import java.util.Collections; 021import java.util.Enumeration; 022import java.util.Iterator; 023import java.util.Objects; 024 025import javax.servlet.FilterConfig; 026 027/** 028 * A configuration wrapper around a {@link FilterConfig}. This configuration is read only, adding or removing a property 029 * will throw an UnsupportedOperationException. 030 * 031 * @since 1.1 032 */ 033public class ServletFilterConfiguration extends BaseWebConfiguration { 034 035 /** Stores the wrapped filter config. */ 036 protected FilterConfig config; 037 038 /** 039 * Create a ServletFilterConfiguration using the filter initialization parameters. 040 * 041 * @param config the filter configuration 042 */ 043 public ServletFilterConfiguration(final FilterConfig config) { 044 this.config = Objects.requireNonNull(config, "config"); 045 } 046 047 @Override 048 protected Iterator<String> getKeysInternal() { 049 // According to the documentation of getInitParameterNames() the 050 // enumeration is of type String. 051 final Enumeration<String> en = config.getInitParameterNames(); 052 return Collections.list(en).iterator(); 053 } 054 055 @Override 056 protected Object getPropertyInternal(final String key) { 057 return handleDelimiters(config.getInitParameter(key)); 058 } 059}