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Merge pull request #10743 from tirumani03/dev/tirumani03/findingClassesInPackage 

[BAEL-4279] Finding All Classes in a Java Package
This commit is contained in:
Jonathan Cook 2021-05-30 15:54:45 +02:00 committed by GitHub
parent 8eb252eae6 29552100ca
commit 1c9bccca01
7 changed files with 124 additions and 0 deletions
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10
core-java-modules/core-java-reflection-2/pom.xml
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@ -22,6 +22,16 @@
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.reflections</groupId>
<artifactId>reflections</artifactId>
<version>0.9.12</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>30.1.1-jre</version>
</dependency>
</dependencies>
<build>

58
core-java-modules/core-java-reflection-2/src/main/java/com/baeldung/reflection/access/packages/AccessingAllClassesInPackage.java Normal file
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@ -0,0 +1,58 @@
package com.baeldung.reflection.access.packages;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Set;
import java.util.stream.Collectors;
import org.reflections.Reflections;
import org.reflections.scanners.SubTypesScanner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.reflect.ClassPath;
@SuppressWarnings("rawtypes")
public class AccessingAllClassesInPackage {
private static final Logger LOG = LoggerFactory.getLogger(AccessingAllClassesInPackage.class);
public Set<Class> findAllClassesUsingClassLoader(String packageName) {
InputStream stream = ClassLoader.getSystemClassLoader()
.getResourceAsStream(packageName.replaceAll("[.]", "/"));
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
return reader.lines()
.filter(line -> line.endsWith(".class"))
.map(line -> getClass(line, packageName))
.collect(Collectors.toSet());
}
private Class getClass(String className, String packageName) {
try {
return Class.forName(packageName + "." + className.substring(0, className.lastIndexOf('.')));
} catch (ClassNotFoundException e) {
LOG.error("<<Class not found>>");
}
return null;
}
public Set<Class> findAllClassesUsingReflectionsLibrary(String packageName) {
Reflections reflections = new Reflections(packageName, new SubTypesScanner(false));
return reflections.getSubTypesOf(Object.class)
.stream()
.collect(Collectors.toSet());
}
public Set<Class> findAllClassesUsingGoogleGuice(String packageName) throws IOException {
return ClassPath.from(ClassLoader.getSystemClassLoader())
.getAllClasses()
.stream()
.filter(clazz -> clazz.getPackageName()
.equalsIgnoreCase(packageName))
.map(clazz -> clazz.load())
.collect(Collectors.toSet());
}
}

6
core-java-modules/core-java-reflection-2/src/main/java/com/baeldung/reflection/access/packages/search/ClassExample.java Normal file
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@ -0,0 +1,6 @@
package com.baeldung.reflection.access.packages.search;
public class ClassExample {
class NestedClassExample {
}
}

4
core-java-modules/core-java-reflection-2/src/main/java/com/baeldung/reflection/access/packages/search/InterfaceExample.java Normal file
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@ -0,0 +1,4 @@
package com.baeldung.reflection.access.packages.search;
public interface InterfaceExample {
}

5
core-java-modules/core-java-reflection-2/src/main/java/com/baeldung/reflection/access/packages/search/Searchable.java Normal file
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@ -0,0 +1,5 @@
package com.baeldung.reflection.access.packages.search;
public @interface Searchable {
}

2
core-java-modules/core-java-reflection-2/src/main/java/com/baeldung/reflection/access/packages/search/package-info.java Normal file
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@ -0,0 +1,2 @@
@Searchable
package com.baeldung.reflection.access.packages.search;

39
core-java-modules/core-java-reflection-2/src/test/java/com/baeldung/reflection/access/packages/AccessingAllClassesInPackageUnitTest.java Normal file
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@ -0,0 +1,39 @@
package com.baeldung.reflection.access.packages;
import java.io.IOException;
import java.util.Set;
import org.junit.Rule;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.rules.ExpectedException;
@SuppressWarnings("rawtypes")
public class AccessingAllClassesInPackageUnitTest {
@Rule
public final ExpectedException exception = ExpectedException.none();
private static final String PACKAGE_NAME = "com.baeldung.reflection.access.packages.search";
@Test
public void when_findAllClassesUsingClassLoader_thenSuccess() {
AccessingAllClassesInPackage instance = new AccessingAllClassesInPackage();
Set<Class> classes = instance.findAllClassesUsingClassLoader(PACKAGE_NAME);
Assertions.assertEquals(5, classes.size());
}
@Test
public void when_findAllClassesUsingReflectionsLibrary_thenSuccess() {
AccessingAllClassesInPackage instance = new AccessingAllClassesInPackage();
Set<Class> classes = instance.findAllClassesUsingReflectionsLibrary(PACKAGE_NAME);
Assertions.assertEquals(5, classes.size());
}
@Test
public void when_findAllClassesUsingGoogleGuice_thenSuccess() throws IOException {
AccessingAllClassesInPackage instance = new AccessingAllClassesInPackage();
Set<Class> classes = instance.findAllClassesUsingGoogleGuice(PACKAGE_NAME);
Assertions.assertEquals(5, classes.size());
}
}