package org.springframework.oxm.jaxb;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlEnum;
import javax.xml.bind.annotation.XmlRegistry;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlSeeAlso;
import javax.xml.bind.annotation.XmlType;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.core.type.filter.TypeFilter;
import org.springframework.lang.Nullable;
import org.springframework.oxm.UncategorizedMappingException;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
class ClassPathJaxb2TypeScanner {
private static final String RESOURCE_PATTERN = "/**/*.class";
private static final TypeFilter[] JAXB2_TYPE_FILTERS = new TypeFilter[] {
new AnnotationTypeFilter(XmlRootElement.class, false),
new AnnotationTypeFilter(XmlType.class, false),
new AnnotationTypeFilter(XmlSeeAlso.class, false),
new AnnotationTypeFilter(XmlEnum.class, false),
new AnnotationTypeFilter(XmlRegistry.class, false)};
private final ResourcePatternResolver resourcePatternResolver;
private final String[] packagesToScan;
public ClassPathJaxb2TypeScanner(@Nullable ClassLoader classLoader, String... packagesToScan) {
Assert.notEmpty(packagesToScan, "'packagesToScan' must not be empty");
this.resourcePatternResolver = new PathMatchingResourcePatternResolver(classLoader);
this.packagesToScan = packagesToScan;
}
public Class<?>[] scanPackages() throws UncategorizedMappingException {
try {
List<Class<?>> jaxb2Classes = new ArrayList<>();
for (String packageToScan : this.packagesToScan) {
String pattern = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
ClassUtils.convertClassNameToResourcePath(packageToScan) + RESOURCE_PATTERN;
Resource[] resources = this.resourcePatternResolver.getResources(pattern);
MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(this.resourcePatternResolver);
for (Resource resource : resources) {
MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource);
if (isJaxb2Class(metadataReader, metadataReaderFactory)) {
String className = metadataReader.getClassMetadata().getClassName();
Class<?> jaxb2AnnotatedClass =
ClassUtils.forName(className, this.resourcePatternResolver.getClassLoader());
jaxb2Classes.add(jaxb2AnnotatedClass);
}
}
}
return ClassUtils.toClassArray(jaxb2Classes);
}
catch (IOException ex) {
throw new UncategorizedMappingException("Failed to scan classpath for unlisted classes", ex);
}
catch (ClassNotFoundException ex) {
throw new UncategorizedMappingException("Failed to load annotated classes from classpath", ex);
}
}
protected boolean isJaxb2Class(MetadataReader reader, MetadataReaderFactory factory) throws IOException {
for (TypeFilter filter : JAXB2_TYPE_FILTERS) {
if (filter.match(reader, factory) && !reader.getClassMetadata().isInterface() ) {
return true;
}
}
return false;
}
}