Re: AW: Re: Lookup BCEL Method for a particular java.lang.reflect.Method / Create JavaClass from java.lang.Class
Davanum Srinivas <[email protected]>
| Newsgroups | gmane.comp.jakarta.bcel.devel |
|---|---|
| Message-ID | <[email protected]> |
Markus, - I had downloaded bcel-5.0rc1 which did not have the SyntheticRepository. - The enclosed patch - Adds a getMethod in JavaClass... - Adds an entry in the manifest to make my Ant happy. - When is RC2? Thanks, dims --- [email protected] wrote: > > > Wish #2: Wish i could create a JavaClass from java.lang.Class as shown below. > > Class clazz = Class.forName("XXXX"); > > ClassParser parser = new ClassParser(clazz); > > JavaClass jclazz = parser.parse(); > > You can already do this: > SyntheticRepository.getInstance().loadClass(clazz); > > using the repository is the preferred way anyway. > > > I can send in patches for both if anyone is interested. > > Yes. > > Cheers > Markus > -- > berlin.de - meine stadt im netz. Jetzt eigene eMail-adresse @berlin.de sichern! > http://webmail.berlin.de > > > -- > To unsubscribe, e-mail: <mailto:[email protected]> > For additional commands, e-mail: <mailto:[email protected]> > ===== Davanum Srinivas - http://xml.apache.org/~dims/ __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com -- To unsubscribe, e-mail: <mailto:[email protected]> For additional commands, e-mail: <mailto:[email protected]>
bcel.txt
(text/plain, 4.3 KB)
cvs server: Diffing .
Index: manifest.txt
===================================================================
RCS file: /home/cvspublic/jakarta-bcel/manifest.txt,v
retrieving revision 1.1
diff -u -r1.1 manifest.txt
--- manifest.txt 18 Apr 2002 07:52:13 -0000 1.1
+++ manifest.txt 12 Jun 2002 16:21:13 -0000
@@ -1,2 +1,4 @@
-Manifest-Version: 1.0
-Main-Class: listclass
+Name: BCEL
+Manifest-Version: 1.0
+Main-Class: listclass
+
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cvs server: Diffing src/java/org/apache/bcel/classfile
Index: src/java/org/apache/bcel/classfile/JavaClass.java
===================================================================
RCS file: /home/cvspublic/jakarta-bcel/src/java/org/apache/bcel/classfile/JavaClass.java,v
retrieving revision 1.9
diff -u -r1.9 JavaClass.java
--- src/java/org/apache/bcel/classfile/JavaClass.java 6 Jun 2002 11:35:43 -0000 1.9
+++ src/java/org/apache/bcel/classfile/JavaClass.java 12 Jun 2002 16:21:13 -0000
@@ -403,7 +403,20 @@
/**
* @return Methods of the class.
*/
- public Method[] getMethods() { return methods; }
+ public Method[] getMethods() { return methods; }
+
+ /**
+ * @return A org.apache.bcel.classfile.Method corresponding to java.lang.reflect.Method
+ */
+ public org.apache.bcel.classfile.Method getMethod(java.lang.reflect.Method m) {
+ for (int i = 0; i < methods.length; i++) {
+ if (m.getName().equals(methods[i].getName()) &&
+ getSignature(m).equals(methods[i].getSignature())) {
+ return methods[i];
+ }
+ }
+ return null;
+ }
/**
* @return Minor number of compiler version.
@@ -794,4 +807,63 @@
return vec.toArray();
}
+
+ /**
+ * Compute the JVM signature for the class.
+ */
+ private String getSignature(Class clazz) {
+ String type = null;
+ if (clazz.isArray()) {
+ Class cl = clazz;
+ int dimensions = 0;
+ while (cl.isArray()) {
+ dimensions++;
+ cl = cl.getComponentType();
+ }
+ StringBuffer sb = new StringBuffer();
+ for (int i = 0; i < dimensions; i++) {
+ sb.append("[");
+ }
+ sb.append(getSignature(cl));
+ type = sb.toString();
+ } else if (clazz.isPrimitive()) {
+ if (clazz == Integer.TYPE) {
+ type = "I";
+ } else if (clazz == Byte.TYPE) {
+ type = "B";
+ } else if (clazz == Long.TYPE) {
+ type = "J";
+ } else if (clazz == Float.TYPE) {
+ type = "F";
+ } else if (clazz == Double.TYPE) {
+ type = "D";
+ } else if (clazz == Short.TYPE) {
+ type = "S";
+ } else if (clazz == Character.TYPE) {
+ type = "C";
+ } else if (clazz == Boolean.TYPE) {
+ type = "Z";
+ } else if (clazz == Void.TYPE) {
+ type = "V";
+ }
+ } else {
+ type = "L" + clazz.getName().replace('.', '/') + ";";
+ }
+ return type;
+ }
+
+ /*
+ * Compute the JVM method descriptor for the method.
+ */
+ private String getSignature(java.lang.reflect.Method meth) {
+ StringBuffer sb = new StringBuffer();
+ sb.append("(");
+ Class[] params = meth.getParameterTypes(); // avoid clone
+ for (int j = 0; j < params.length; j++) {
+ sb.append(getSignature(params[j]));
+ }
+ sb.append(")");
+ sb.append(getSignature(meth.getReturnType()));
+ return sb.toString();
+ }
}
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