org.springframework.boot.autoconfigure.template.TemplateLocation Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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.template;
import java.io.IOException;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.util.Assert;
/**
* Contains a location that templates can be loaded from.
*
* @author Phillip Webb
* @since 1.2.1
*/
public class TemplateLocation {
private final String path;
public TemplateLocation(String path) {
Assert.notNull(path, "Path must not be null");
this.path = path;
}
/**
* Determine if this template location exists using the specified
* {@link ResourcePatternResolver}.
* @param resolver the resolver used to test if the location exists
* @return {@code true} if the location exists.
*/
public boolean exists(ResourcePatternResolver resolver) {
Assert.notNull(resolver, "Resolver must not be null");
if (resolver.getResource(this.path).exists()) {
return true;
}
try {
return anyExists(resolver);
}
catch (IOException ex) {
return false;
}
}
private boolean anyExists(ResourcePatternResolver resolver) throws IOException {
String searchPath = this.path;
if (searchPath.startsWith(ResourceLoader.CLASSPATH_URL_PREFIX)) {
searchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
+ searchPath.substring(ResourceLoader.CLASSPATH_URL_PREFIX.length());
}
if (searchPath.startsWith(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX)) {
Resource[] resources = resolver.getResources(searchPath);
for (Resource resource : resources) {
if (resource.exists()) {
return true;
}
}
}
return false;
}
@Override
public String toString() {
return this.path;
}
}