Polish
Phillip Webb
8 years ago
parent
b2f0ebfcb8
commit
758ddcd420
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/*
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* Copyright 2012-2017 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.autoconfigure.template;
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import java.util.List;
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import org.springframework.beans.BeanUtils;
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import org.springframework.boot.bind.PropertySourcesPropertyValues;
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import org.springframework.boot.bind.RelaxedDataBinder;
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import org.springframework.core.env.ConfigurableEnvironment;
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import org.springframework.core.env.Environment;
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import org.springframework.core.io.ResourceLoader;
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import org.springframework.util.ClassUtils;
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/**
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* Abstract base class for {@link TemplateAvailabilityProvider} implementations.
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*
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* @author Andy Wilkinson
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* @author Phillip Webb
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* @since 1.4.6
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*/
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public abstract class AbstractTemplateAvailabilityProvider
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implements TemplateAvailabilityProvider {
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private final String className;
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private final Class<? extends TemplateAvailabilityProperties> propertiesClass;
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private final String propertyPrefix;
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public AbstractTemplateAvailabilityProvider(String className,
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Class<? extends TemplateAvailabilityProperties> propertiesClass,
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String propertyPrefix) {
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this.className = className;
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this.propertiesClass = propertiesClass;
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this.propertyPrefix = propertyPrefix;
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}
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@Override
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public boolean isTemplateAvailable(String view, Environment environment,
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ClassLoader classLoader, ResourceLoader resourceLoader) {
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if (ClassUtils.isPresent(this.className, classLoader)) {
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TemplateAvailabilityProperties properties = BeanUtils
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.instantiateClass(this.propertiesClass);
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RelaxedDataBinder binder = new RelaxedDataBinder(properties,
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this.propertyPrefix);
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binder.bind(new PropertySourcesPropertyValues(
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((ConfigurableEnvironment) environment).getPropertySources()));
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return isTemplateAvailable(view, resourceLoader, properties);
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}
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return false;
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}
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private boolean isTemplateAvailable(String view, ResourceLoader resourceLoader,
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TemplateAvailabilityProperties properties) {
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String location = properties.getPrefix() + view + properties.getSuffix();
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for (String path : properties.getLoaderPath()) {
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if (resourceLoader.getResource(path + location).exists()) {
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return true;
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}
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}
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return false;
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}
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protected static abstract class TemplateAvailabilityProperties {
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private String prefix;
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private String suffix;
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protected TemplateAvailabilityProperties(String prefix, String suffix) {
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this.prefix = prefix;
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this.suffix = suffix;
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}
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protected abstract List<String> getLoaderPath();
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public String getPrefix() {
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return this.prefix;
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}
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public void setPrefix(String prefix) {
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this.prefix = prefix;
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}
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public String getSuffix() {
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return this.suffix;
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}
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public void setSuffix(String suffix) {
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this.suffix = suffix;
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}
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}
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}
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