org.springframework.boot.env.EnumerableCompositePropertySource Maven / Gradle / Ivy
/*
* Copyright 2012-2014 the original author or authors.
*
* Licensed 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.springframework.boot.env;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.PropertySource;
/**
* An mutable, enumerable, composite property source. New sources are added last (and
* hence resolved with lowest priority).
*
* @author Dave Syer
* @see PropertySource
* @see EnumerablePropertySource
*/
public class EnumerableCompositePropertySource
extends EnumerablePropertySource>> {
private volatile String[] names;
public EnumerableCompositePropertySource(String sourceName) {
super(sourceName, new LinkedHashSet>());
}
@Override
public Object getProperty(String name) {
for (PropertySource propertySource : getSource()) {
Object value = propertySource.getProperty(name);
if (value != null) {
return value;
}
}
return null;
}
@Override
public String[] getPropertyNames() {
String[] result = this.names;
if (result == null) {
List names = new ArrayList();
for (PropertySource source : new ArrayList>(
getSource())) {
if (source instanceof EnumerablePropertySource) {
names.addAll(Arrays.asList(
((EnumerablePropertySource) source).getPropertyNames()));
}
}
this.names = names.toArray(new String[0]);
result = this.names;
}
return result;
}
public void add(PropertySource source) {
getSource().add(source);
this.names = null;
}
}