org.springframework.boot.autoconfigure.mustache.MustacheEnvironmentCollector Maven / Gradle / Ivy
/*
* Copyright 2012-2020 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.boot.autoconfigure.mustache;
import com.samskivert.mustache.DefaultCollector;
import com.samskivert.mustache.Mustache.Collector;
import com.samskivert.mustache.Mustache.VariableFetcher;
import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
/**
* Mustache {@link Collector} to expose properties from the Spring {@link Environment}.
*
* @author Dave Syer
* @author Madhura Bhave
* @since 1.2.2
*/
public class MustacheEnvironmentCollector extends DefaultCollector implements EnvironmentAware {
private ConfigurableEnvironment environment;
private final VariableFetcher propertyFetcher = new PropertyVariableFetcher();
@Override
public void setEnvironment(Environment environment) {
this.environment = (ConfigurableEnvironment) environment;
}
@Override
public VariableFetcher createFetcher(Object ctx, String name) {
VariableFetcher fetcher = super.createFetcher(ctx, name);
if (fetcher != null) {
return fetcher;
}
if (this.environment.containsProperty(name)) {
return this.propertyFetcher;
}
return null;
}
private class PropertyVariableFetcher implements VariableFetcher {
@Override
public Object get(Object ctx, String name) {
return MustacheEnvironmentCollector.this.environment.getProperty(name);
}
}
}