/*
* Copyright 2014 - 2017 Blazebit.
*
* 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 com.blazebit.persistence.view.impl.spring;
import org.springframework.beans.BeanUtils;
import org.springframework.context.annotation.FilterType;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.core.type.filter.AspectJTypeFilter;
import org.springframework.core.type.filter.AssignableTypeFilter;
import org.springframework.core.type.filter.RegexPatternTypeFilter;
import org.springframework.core.type.filter.TypeFilter;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;
/**
* @author Moritz Becker (moritz.becker@gmx.at)
* @since 1.2
*/
public class AnnotationEntityViewConfigurationSource extends AbstractEntityViewConfigurationSource {
private static final String BASE_PACKAGES = "basePackages";
private static final String BASE_PACKAGE_CLASSES = "basePackageClasses";
private final AnnotationMetadata configMetadata;
private final AnnotationAttributes attributes;
private final ResourceLoader resourceLoader;
public AnnotationEntityViewConfigurationSource(AnnotationMetadata metadata, Class<? extends Annotation> annotation,
ResourceLoader resourceLoader, Environment environment) {
super(environment);
Assert.notNull(metadata);
Assert.notNull(annotation);
Assert.notNull(resourceLoader);
this.attributes = new AnnotationAttributes(metadata.getAnnotationAttributes(annotation.getName()));
this.configMetadata = metadata;
this.resourceLoader = resourceLoader;
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.config.RepositoryConfigurationSource#getBasePackages()
*/
@Override
public Iterable<String> getBasePackages() {
String[] value = attributes.getStringArray("value");
String[] basePackages = attributes.getStringArray(BASE_PACKAGES);
Class<?>[] basePackageClasses = attributes.getClassArray(BASE_PACKAGE_CLASSES);
// Default configuration - return package of annotated class
if (value.length == 0 && basePackages.length == 0 && basePackageClasses.length == 0) {
String className = configMetadata.getClassName();
return Collections.singleton(ClassUtils.getPackageName(className));
}
Set<String> packages = new HashSet<String>();
packages.addAll(Arrays.asList(value));
packages.addAll(Arrays.asList(basePackages));
for (Class<?> typeName : basePackageClasses) {
packages.add(ClassUtils.getPackageName(typeName));
}
return packages;
}
protected Iterable<TypeFilter> getIncludeFilters() {
return parseFilters("includeFilters");
}
protected Iterable<TypeFilter> getExcludeFilters() {
return parseFilters("excludeFilters");
}
private Set<TypeFilter> parseFilters(String attributeName) {
Set<TypeFilter> result = new HashSet<>();
AnnotationAttributes[] filters = attributes.getAnnotationArray(attributeName);
for (AnnotationAttributes filter : filters) {
result.addAll(typeFiltersFor(filter));
}
return result;
}
/**
* Copy of {@code ComponentScanAnnotationParser#typeFiltersFor}.
*
* @param filterAttributes
* @return
*/
private List<TypeFilter> typeFiltersFor(AnnotationAttributes filterAttributes) {
List<TypeFilter> typeFilters = new ArrayList<TypeFilter>();
FilterType filterType = filterAttributes.getEnum("type");
for (Class<?> filterClass : filterAttributes.getClassArray("value")) {
switch (filterType) {
case ANNOTATION:
Assert.isAssignable(Annotation.class, filterClass, "An error occured when processing a @ComponentScan "
+ "ANNOTATION type filter: ");
@SuppressWarnings("unchecked")
Class<Annotation> annoClass = (Class<Annotation>) filterClass;
typeFilters.add(new AnnotationTypeFilter(annoClass));
break;
case ASSIGNABLE_TYPE:
typeFilters.add(new AssignableTypeFilter(filterClass));
break;
case CUSTOM:
Assert.isAssignable(TypeFilter.class, filterClass, "An error occured when processing a @ComponentScan "
+ "CUSTOM type filter: ");
typeFilters.add(BeanUtils.instantiateClass(filterClass, TypeFilter.class));
break;
default:
throw new IllegalArgumentException("Unknown filter type " + filterType);
}
}
for (String expression : getPatterns(filterAttributes)) {
String rawName = filterType.toString();
if ("REGEX".equals(rawName)) {
typeFilters.add(new RegexPatternTypeFilter(Pattern.compile(expression)));
} else if ("ASPECTJ".equals(rawName)) {
typeFilters.add(new AspectJTypeFilter(expression, this.resourceLoader.getClassLoader()));
} else {
throw new IllegalArgumentException("Unknown filter type " + filterType);
}
}
return typeFilters;
}
/**
* Safely reads the {@code pattern} attribute from the given {@link AnnotationAttributes} and returns an empty list if
* the attribute is not present.
*
* @param filterAttributes must not be {@literal null}.
* @return
*/
private String[] getPatterns(AnnotationAttributes filterAttributes) {
try {
return filterAttributes.getStringArray("pattern");
} catch (IllegalArgumentException o_O) {
return new String[0];
}
}
}