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| author | patriot1burke <patriot1burke@30ef5769-5b8d-40dd-aea6-55b5d6557bb3> | 2003-04-22 13:47:06 +0000 |
|---|---|---|
| committer | patriot1burke <patriot1burke@30ef5769-5b8d-40dd-aea6-55b5d6557bb3> | 2003-04-22 13:47:06 +0000 |
| commit | 069bceaf72fd0d6ffad14ce4e3e00ca91a280bde (patch) | |
| tree | b8230a15d3061c64d5a64bf9efa654d0d6311ff2 /sample/reflect | |
| parent | f610083ba0adbcb3fe92a504015fb26fb5a42530 (diff) | |
| download | javassist-069bceaf72fd0d6ffad14ce4e3e00ca91a280bde.tar.gz javassist-069bceaf72fd0d6ffad14ce4e3e00ca91a280bde.zip | |
This commit was generated by cvs2svn to compensate for changes in r2, which
included commits to RCS files with non-trunk default branches.
git-svn-id: http://anonsvn.jboss.org/repos/javassist/trunk@6 30ef5769-5b8d-40dd-aea6-55b5d6557bb3
Diffstat (limited to 'sample/reflect')
| -rw-r--r-- | sample/reflect/Main.java | 33 | ||||
| -rw-r--r-- | sample/reflect/Person.java | 51 | ||||
| -rw-r--r-- | sample/reflect/VerboseMetaobj.java | 29 |
3 files changed, 113 insertions, 0 deletions
diff --git a/sample/reflect/Main.java b/sample/reflect/Main.java new file mode 100644 index 00000000..6086d9f8 --- /dev/null +++ b/sample/reflect/Main.java @@ -0,0 +1,33 @@ +package sample.reflect;
+
+import javassist.reflect.ClassMetaobject;
+import javassist.reflect.Loader;
+
+/*
+ The "verbose metaobject" example (JDK 1.2 or later only).
+
+ Since this program registers class Person as a reflective class
+ (in a more realistic demonstration, what classes are reflective
+ would be specified by some configuration file), the class loader
+ modifies Person.class when loading into the JVM so that the class
+ Person is changed into a reflective class and a Person object is
+ controlled by a VerboseMetaobj.
+
+ To run,
+
+ % java javassist.reflect.Loader sample.reflect.Main Joe
+
+ Compare this result with that of the regular execution without reflection:
+
+ % java sample.reflect.Person Joe
+*/
+public class Main {
+ public static void main(String[] args) throws Throwable {
+ Loader cl = (Loader)Main.class.getClassLoader();
+ cl.makeReflective("sample.reflect.Person",
+ "sample.reflect.VerboseMetaobj",
+ "javassist.reflect.ClassMetaobject");
+
+ cl.run("sample.reflect.Person", args);
+ }
+}
diff --git a/sample/reflect/Person.java b/sample/reflect/Person.java new file mode 100644 index 00000000..5e0e2ad8 --- /dev/null +++ b/sample/reflect/Person.java @@ -0,0 +1,51 @@ +/*
+ A base-level class controlled by VerboseMetaobj.
+*/
+
+package sample.reflect;
+
+import javassist.reflect.Metalevel;
+import javassist.reflect.Metaobject;
+
+public class Person {
+ public String name;
+ public static int birth = 3;
+ public static final String defaultName = "John";
+
+ public Person(String name, int birthYear) {
+ if (name == null)
+ this.name = defaultName;
+ else
+ this.name = name;
+
+ this.birth = birthYear;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public int getAge(int year) {
+ return year - birth;
+ }
+
+ public static void main(String[] args) {
+ String name;
+ if (args.length > 0)
+ name = args[0];
+ else
+ name = "Bill";
+
+ Person p = new Person(name, 1960);
+ System.out.println("name: " + p.getName());
+ System.out.println("object: " + p.toString());
+
+ // change the metaobject of p.
+ if (p instanceof Metalevel) {
+ ((Metalevel)p)._setMetaobject(new Metaobject(p, null));
+ System.out.println("<< the metaobject was changed.>>");
+ }
+
+ System.out.println("age: " + p.getAge(1999));
+ }
+}
diff --git a/sample/reflect/VerboseMetaobj.java b/sample/reflect/VerboseMetaobj.java new file mode 100644 index 00000000..a9f75dd1 --- /dev/null +++ b/sample/reflect/VerboseMetaobj.java @@ -0,0 +1,29 @@ +package sample.reflect;
+
+import javassist.*;
+import javassist.reflect.*;
+
+public class VerboseMetaobj extends Metaobject {
+ public VerboseMetaobj(Object self, Object[] args) {
+ super(self, args);
+ System.out.println("** constructed: " + self.getClass().getName());
+ }
+
+ public Object trapFieldRead(String name) {
+ System.out.println("** field read: " + name);
+ return super.trapFieldRead(name);
+ }
+
+ public void trapFieldWrite(String name, Object value) {
+ System.out.println("** field write: " + name);
+ super.trapFieldWrite(name, value);
+ }
+
+ public Object trapMethodcall(int identifier, Object[] args)
+ throws Throwable
+ {
+ System.out.println("** trap: " + getMethodName(identifier)
+ + "() in " + getClassMetaobject().getName());
+ return super.trapMethodcall(identifier, args);
+ }
+}
|