org.springframework.core.env.CompositePropertySource Maven / Gradle / Ivy
/*
* Copyright 2002-2017 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
*
* https://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.core.env;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.springframework.lang.Nullable;
import org.springframework.util.StringUtils;
/**
* Composite {@link PropertySource} implementation that iterates over a set of
* {@link PropertySource} instances. Necessary in cases where multiple property sources
* share the same name, e.g. when multiple values are supplied to {@code @PropertySource}.
*
* As of Spring 4.1.2, this class extends {@link EnumerablePropertySource} instead
* of plain {@link PropertySource}, exposing {@link #getPropertyNames()} based on the
* accumulated property names from all contained sources (as far as possible).
*
* @author Chris Beams
* @author Juergen Hoeller
* @author Phillip Webb
* @since 3.1.1
*/
public class CompositePropertySource extends EnumerablePropertySource