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# Spring ComparisonPropertySource
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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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- 整体代码如下.
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- 下面几个调用方法会直接抛出异常
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1. getSource
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1. containsProperty
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1. getProperty
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```java
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static class ComparisonPropertySource extends StubPropertySource {
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// 异常信息
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private static final String USAGE_ERROR =
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"ComparisonPropertySource instances are for use with collection comparison only";
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public ComparisonPropertySource(String name) {
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super(name);
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}
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@Override
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public Object getSource() {
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// 抛异常
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throw new UnsupportedOperationException(USAGE_ERROR);
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}
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@Override
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public boolean containsProperty(String name) {
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// 抛异常
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throw new UnsupportedOperationException(USAGE_ERROR);
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}
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@Override
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@Nullable
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public String getProperty(String name) {
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// 抛异常
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throw new UnsupportedOperationException(USAGE_ERROR);
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}
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}
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```
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