[tomcat-jakartaee-migration] branch master updated: Add ClassFileTransformer hook

[remm]

This is an automated email from the ASF dual-hosted git repository.

remm pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/tomcat-jakartaee-migration.git


The following commit(s) were added to refs/heads/master by this push:
     new a6b2607  Add ClassFileTransformer hook
a6b2607 is described below

commit a6b260792435f458b1b90d1bc70bb5c0ac266e0f
Author: remm <r...@apache.org>
AuthorDate: Thu Feb 11 17:00:48 2021 +0100

    Add ClassFileTransformer hook
    
    For possible experimentations inside the WebappClassLoader.
---
 .../apache/tomcat/jakartaee/ClassConverter.java    | 23 +++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/apache/tomcat/jakartaee/ClassConverter.java 
b/src/main/java/org/apache/tomcat/jakartaee/ClassConverter.java
index 1b15652..0173f71 100644
--- a/src/main/java/org/apache/tomcat/jakartaee/ClassConverter.java
+++ b/src/main/java/org/apache/tomcat/jakartaee/ClassConverter.java
@@ -16,9 +16,14 @@
  */
 package org.apache.tomcat.jakartaee;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.security.ProtectionDomain;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -27,7 +32,7 @@ import org.apache.bcel.classfile.Constant;
 import org.apache.bcel.classfile.ConstantUtf8;
 import org.apache.bcel.classfile.JavaClass;
 
-public class ClassConverter implements Converter {
+public class ClassConverter implements Converter, ClassFileTransformer {
 
     private static final Logger logger = 
Logger.getLogger(ClassConverter.class.getCanonicalName());
     private static final StringManager sm = 
StringManager.getManager(ClassConverter.class);
@@ -74,4 +79,20 @@ public class ClassConverter implements Converter {
 
         javaClass.dump(dest);
     }
+
+
+    @Override
+    public byte[] transform(ClassLoader loader, String className,
+            Class<?> classBeingRedefined, ProtectionDomain protectionDomain,
+            byte[] classfileBuffer) throws IllegalClassFormatException {
+        ByteArrayInputStream inputStream = new 
ByteArrayInputStream(classfileBuffer);
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        try {
+            convert(className, inputStream, outputStream, 
EESpecProfile.TOMCAT);
+        } catch (IOException e) {
+            throw new IllegalClassFormatException(e.getLocalizedMessage());
+        }
+        return outputStream.toByteArray();
+    }
+
 }


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