org.springframework.boot.autoconfigure.template.TemplateLocation.java Source code

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Here is the source code for org.springframework.boot.autoconfigure.template.TemplateLocation.java

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/*
 * 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;
    }

}