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107 lines
2.7 KiB
107 lines
2.7 KiB
# Spring CompositePropertySource
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- Author: [HuiFer](https://github.com/huifer)
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- 源码阅读仓库: [SourceHot-spring](https://github.com/SourceHot/spring-framework-read)
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- 全路径: `org.springframework.core.env.CompositePropertySource`
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- 整体代码如下
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```java
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public class CompositePropertySource extends EnumerablePropertySource<Object> {
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/**
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* set 集合
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*/
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private final Set<PropertySource<?>> propertySources = new LinkedHashSet<>();
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/**
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* Create a new {@code CompositePropertySource}.
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* @param name the name of the property source
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*/
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public CompositePropertySource(String name) {
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super(name);
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}
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@Override
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@Nullable
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public Object getProperty(String name) {
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// 循环
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for (PropertySource<?> propertySource : this.propertySources) {
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// 获取存储内容
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Object candidate = propertySource.getProperty(name);
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if (candidate != null) {
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return candidate;
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}
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}
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return null;
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}
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@Override
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public boolean containsProperty(String name) {
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for (PropertySource<?> propertySource : this.propertySources) {
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// 是否存在name
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if (propertySource.containsProperty(name)) {
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return true;
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}
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}
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return false;
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}
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@Override
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public String[] getPropertyNames() {
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Set<String> names = new LinkedHashSet<>();
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for (PropertySource<?> propertySource : this.propertySources) {
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// 类型不同抛出异常
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if (!(propertySource instanceof EnumerablePropertySource)) {
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throw new IllegalStateException(
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"Failed to enumerate property names due to non-enumerable property source: " + propertySource);
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}
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// 批量添加
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names.addAll(Arrays.asList(((EnumerablePropertySource<?>) propertySource).getPropertyNames()));
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}
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// 转换成 array
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return StringUtils.toStringArray(names);
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}
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/**
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* Add the given {@link PropertySource} to the end of the chain.
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* @param propertySource the PropertySource to add
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*/
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public void addPropertySource(PropertySource<?> propertySource) {
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this.propertySources.add(propertySource);
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}
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/**
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* Add the given {@link PropertySource} to the start of the chain.
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* @param propertySource the PropertySource to add
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* @since 4.1
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*/
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public void addFirstPropertySource(PropertySource<?> propertySource) {
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// 头插
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List<PropertySource<?>> existing = new ArrayList<>(this.propertySources);
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this.propertySources.clear();
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this.propertySources.add(propertySource);
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this.propertySources.addAll(existing);
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}
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/**
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* Return all property sources that this composite source holds.
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* @since 4.1.1
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*/
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public Collection<PropertySource<?>> getPropertySources() {
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return this.propertySources;
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}
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@Override
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public String toString() {
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return getClass().getSimpleName() + " {name='" + this.name + "', propertySources=" + this.propertySources + "}";
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}
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}
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```
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