content: /*
   * Copyright 2012-2016 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.
   */
  
  package org.springframework.boot.autoconfigure.velocity;
  
  import com.alibaba.boot.velocity.util.CompatibleRelaxedPropertyResolver;
  import org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider;
  import org.springframework.core.env.Environment;
  import org.springframework.core.env.PropertyResolver;
  import org.springframework.core.io.ResourceLoader;
  import org.springframework.util.ClassUtils;
  
  /**
   * {@link TemplateAvailabilityProvider} that provides availability information for
   * Velocity view templates.
   *
   * @author Andy Wilkinson
   * @since 1.1.0
   * @deprecated as of 1.4 following the deprecation of Velocity support in Spring Framework
   * 4.3
   */
  @Deprecated
  public class VelocityTemplateAvailabilityProvider
          implements TemplateAvailabilityProvider {
  
      @Override
      public boolean isTemplateAvailable(String view, Environment environment,
                                         ClassLoader classLoader, ResourceLoader resourceLoader) {
          if (ClassUtils.isPresent("org.apache.velocity.app.VelocityEngine", classLoader)) {
              PropertyResolver resolver = new CompatibleRelaxedPropertyResolver(environment);
              String loaderPath = resolver.getProperty("resource-loader-path",
                      "spring.velocity." + VelocityProperties.DEFAULT_RESOURCE_LOADER_PATH);
              String prefix = resolver.getProperty("prefix",
                      "spring.velocity." + VelocityProperties.DEFAULT_PREFIX);
              String suffix = resolver.getProperty("suffix",
                      "spring.velocity." + VelocityProperties.DEFAULT_SUFFIX);
              return resourceLoader.getResource(loaderPath + prefix + view + suffix)
                      .exists();
          }
          return false;
      }
  
  }
  