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Support 'required properties' precondition
Users may now call #setRequiredProperties(String...) against the Environment (via its ConfigurablePropertyResolver interface) in order to indicate which properties must be present. Environment#validateRequiredProperties() is invoked by AbstractApplicationContext during the refresh() lifecycle to perform the actual check and a MissingRequiredPropertiesException is thrown if the precondition is not satisfied. Issue: SPR-8323
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...k.core/src/main/java/org/springframework/core/env/MissingRequiredPropertiesException.java
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/* | ||
* Copyright 2002-2011 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. | ||
*/ | ||
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package org.springframework.core.env; | ||
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import java.util.LinkedHashSet; | ||
import java.util.Set; | ||
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/** | ||
* Exception thrown when required properties are not found. | ||
* | ||
* @author Chris Beams | ||
* @since 3.1 | ||
* @see ConfigurablePropertyResolver#setRequiredProperties(String...) | ||
* @see ConfigurablePropertyResolver#validateRequiredProperties() | ||
* @see org.springframework.context.support.AbstractApplicationContext#prepareRefresh() | ||
*/ | ||
@SuppressWarnings("serial") | ||
public class MissingRequiredPropertiesException extends IllegalStateException { | ||
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private final Set<String> missingRequiredProperties = new LinkedHashSet<String>(); | ||
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/** | ||
* Return the set of properties marked as required but not present | ||
* upon validation. | ||
* @see ConfigurablePropertyResolver#setRequiredProperties(String...) | ||
* @see ConfigurablePropertyResolver#validateRequiredProperties() | ||
*/ | ||
public Set<String> getMissingRequiredProperties() { | ||
return missingRequiredProperties; | ||
} | ||
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void addMissingRequiredProperty(String key) { | ||
missingRequiredProperties.add(key); | ||
} | ||
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@Override | ||
public String getMessage() { | ||
return String.format( | ||
"The following properties were declared as required but could " + | ||
"not be resolved: %s", this.getMissingRequiredProperties()); | ||
} | ||
} |
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