changed CtMethod#copy() and updated related javadoc comments

git-svn-id: http://anonsvn.jboss.org/repos/javassist/trunk@396 30ef5769-5b8d-40dd-aea6-55b5d6557bb3

src/main/javassist/ClassMap.java

@@ -82,7 +82,7 @@ public class ClassMap extends java.util.HashMap {
      * <code>oldname</code> to <code>newname</code>.  See
      * <code>fix</code> method.
      *
-     * @param oldname   the original class name
+     * @param oldname   the original class name.
      * @param newname   the substituted class name.
      * @see #fix(String)
      */
@@ -96,6 +96,25 @@ public class ClassMap extends java.util.HashMap {
             super.put(oldname2, toJvmName(newname));
     }
 
+    /**
+     * Is equivalent to <code>put()</code> except that
+     * the given mapping is not recorded into the hashtable
+     * if another mapping from <code>oldname</code> is
+     * already included. 
+     *
+     * @param oldname       the original class name.
+     * @param newname       the substituted class name.
+     */
+    public void putIfNone(String oldname, String newname) {
+        if (oldname == newname)
+            return;
+
+        String oldname2 = toJvmName(oldname);
+        String s = (String)get(oldname2);
+        if (s == null)
+            super.put(oldname2, toJvmName(newname));
+    }
+
     protected final void put0(Object oldname, Object newname) {
         super.put(oldname, newname);
     }

src/main/javassist/CtBehavior.java

@@ -59,7 +59,7 @@ public abstract class CtBehavior extends CtMember {
                     if (srcSuperName.equals(CtClass.javaLangObject))
                         patch = true;
                     else
-                        map.put(srcSuperName, destSuperName);
+                        map.putIfNone(srcSuperName, destSuperName);
             }
 
             // a stack map table is copied from srcInfo.

src/main/javassist/CtConstructor.java

@@ -74,7 +74,8 @@ public final class CtConstructor extends CtBehavior {
      * with the name of the class and the superclass that
      * the created constructor is added to.
      * This is done whichever <code>map</code> is null or not.
-     * To prevent this replacement, call <code>ClassMap.fix()</code>.
+     * To prevent this replacement, call <code>ClassMap.fix()</code>
+     * or <code>put()</code> to explicitly specify replacement.
      *
      * <p><b>Note:</b> if the <code>.class</code> notation (for example,
      * <code>String.class</code>) is included in an expression, the

src/main/javassist/CtMethod.java

@@ -83,7 +83,8 @@ public final class CtMethod extends CtBehavior {
      * with the name of the class and the superclass that the
      * created method is added to.
      * This is done whichever <code>map</code> is null or not.
-     * To prevent this replacement, call <code>ClassMap.fix()</code>.
+     * To prevent this replacement, call <code>ClassMap.fix()</code>
+     * or <code>put()</code> to explicitly specify replacement.
      *
      * <p><b>Note:</b> if the <code>.class</code> notation (for example,
      * <code>String.class</code>) is included in an expression, the