001/*
002 * Copyright 2012-2017 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.boot.autoconfigure.template;
018
019import java.io.IOException;
020
021import org.springframework.core.io.Resource;
022import org.springframework.core.io.ResourceLoader;
023import org.springframework.core.io.support.ResourcePatternResolver;
024import org.springframework.util.Assert;
025
026/**
027 * Contains a location that templates can be loaded from.
028 *
029 * @author Phillip Webb
030 * @since 1.2.1
031 */
032public class TemplateLocation {
033
034        private final String path;
035
036        public TemplateLocation(String path) {
037                Assert.notNull(path, "Path must not be null");
038                this.path = path;
039        }
040
041        /**
042         * Determine if this template location exists using the specified
043         * {@link ResourcePatternResolver}.
044         * @param resolver the resolver used to test if the location exists
045         * @return {@code true} if the location exists.
046         */
047        public boolean exists(ResourcePatternResolver resolver) {
048                Assert.notNull(resolver, "Resolver must not be null");
049                if (resolver.getResource(this.path).exists()) {
050                        return true;
051                }
052                try {
053                        return anyExists(resolver);
054                }
055                catch (IOException ex) {
056                        return false;
057                }
058        }
059
060        private boolean anyExists(ResourcePatternResolver resolver) throws IOException {
061                String searchPath = this.path;
062                if (searchPath.startsWith(ResourceLoader.CLASSPATH_URL_PREFIX)) {
063                        searchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
064                                        + searchPath.substring(ResourceLoader.CLASSPATH_URL_PREFIX.length());
065                }
066                if (searchPath.startsWith(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX)) {
067                        Resource[] resources = resolver.getResources(searchPath);
068                        for (Resource resource : resources) {
069                                if (resource.exists()) {
070                                        return true;
071                                }
072                        }
073                }
074                return false;
075        }
076
077        @Override
078        public String toString() {
079                return this.path;
080        }
081
082}