org.apache.struts2.config.DelegatingSettings Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.struts2.config;
import com.opensymphony.xwork2.util.location.Location;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
/**
* DelegatingSettings stores an internal list of {@link Settings} objects
* to update settings or retrieve settings values.
*
* Each time a Settings method is called (get, set, list, and so forth),
* this class goes through the list of Settings objects
* and calls that method for each delegate,
* withholding any exception until all delegates have been called.
*
*/
class DelegatingSettings implements Settings {
/**
* The Settings objects.
*/
List delegates;
/**
* Creates a new DelegatingSettings object utilizing the list of {@link Settings} objects.
*
* @param delegates The Settings objects to use as delegates
*/
public DelegatingSettings(List delegates) {
this.delegates = delegates;
}
public String get(String name) throws IllegalArgumentException {
for (Settings delegate : delegates) {
String value = delegate.get(name);
if (value != null) {
return value;
}
}
return null;
}
public Iterator list() {
boolean workedAtAll = false;
Set