net.alpha.velocity.configuration.VelocityTemplateAvailabilityProvider.java Source code

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Here is the source code for net.alpha.velocity.configuration.VelocityTemplateAvailabilityProvider.java

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/*
 * 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 net.alpha.velocity.configuration;

import org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider;
import org.springframework.boot.bind.RelaxedPropertyResolver;
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
 * 4.3
 */
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 RelaxedPropertyResolver(environment, "spring.velocity.");
            String loaderPath = resolver.getProperty("resource-loader-path",
                    VelocityProperties.DEFAULT_RESOURCE_LOADER_PATH);
            String prefix = resolver.getProperty("prefix", VelocityProperties.DEFAULT_PREFIX);
            String suffix = resolver.getProperty("suffix", VelocityProperties.DEFAULT_SUFFIX);
            return resourceLoader.getResource(loaderPath + prefix + view + suffix).exists();
        }
        return false;
    }

}