cvs: /php4/ext/java reflect.java

rubys Mon Dec 6 00:01:09 1999 EDT Modified files: /php4/ext/java reflect.java Log: first pass at method overloading Index: php4/ext/java/reflect.java diff -u php4/ext/java/reflect.java:1.2 php4/ext/java/reflect.java:1.3 --- php4/ext/java/reflect.java:1.2 Mon Nov 29 10:36:23 1999 +++ php4/ext/java/reflect.java Mon Dec 6 00:00:39 1999 @@ -19,7 +19,7 @@ package net.php; import java.lang.reflect.*; -import java.util.ResourceBundle; +import java.util.*; import java.beans.*; class reflect { @@ -115,28 +115,110 @@ } // + // Select the best match from a list of methods + // + private static Method select(Vector methods, Object args[]) { + if (methods.size() == 1) return (Method) methods.firstElement(); + + Method selected = null; + int best = Integer.MAX_VALUE; + + for (Enumeration e = methods.elements(); e.hasMoreElements(); ) { + Method method = (Method)e.nextElement(); + int weight=0; + Class parms[] = method.getParameterTypes(); + for (int i=0; i<parms.length; i++) { + if (parms[i].isInstance(args[i])) { + for (Class c=parms[i]; (c=c.getSuperclass()) != null; ) { + if (!c.isInstance(args[i])) break; + weight++; + } + } else if (parms[i].isPrimitive()) { + Class c=parms[i]; + if (args[i] instanceof Number) { + if (c==Boolean.TYPE) weight+=5; + if (c==Character.TYPE) weight+=4; + if (c==Byte.TYPE) weight+=3; + if (c==Short.TYPE) weight+=2; + if (c==Integer.TYPE) weight++; + if (c==Float.TYPE) weight++; + } else if (args[i] instanceof Boolean) { + if (c!=Boolean.TYPE) weight+=9999; + } else if (args[i] instanceof String) { + if (c== Character.TYPE || ((String)args[i]).length()>0) + weight+=((String)args[i]).length(); + else + weight+=9999; + } else { + weight+=9999; + } + } else { + weight+=9999; + } + } + + if (weight < best) { + if (weight == 0) return method; + best = weight; + selected = method; + } + } + + return selected; + } + + // + // Select the best match from a list of methods + // + private static Object[] coerce(Method method, Object args[]) { + Object result[] = args; + Class parms[] = method.getParameterTypes(); + for (int i=0; i<args.length; i++) { + if (parms[i].isInstance(args[i])) continue; + if (args[i] instanceof Number && parms[i].isPrimitive()) { + if (result==args) result=(Object[])result.clone(); + Class c = parms[i]; + Number n = (Number)args[i]; + if (c == Boolean.TYPE) result[i]=new Boolean(0.0!=n.floatValue()); + if (c == Byte.TYPE) result[i]=new Byte(n.byteValue()); + if (c == Short.TYPE) result[i]=new Short(n.shortValue()); + if (c == Integer.TYPE) result[i]=new Integer(n.intValue()); + if (c == Float.TYPE) result[i]=new Float(n.floatValue()); + if (c == Long.TYPE && !(n instanceof Long)) + result[i]=new Long(n.longValue()); + } + } + return result; + } + + // // Invoke a method on a given object // public static void Invoke (Object object, String method, Object args[], long result) { try { + Vector matches = new Vector(); + // gather for (Class jclass = object.getClass();;jclass=(Class)object) { Method methods[] = jclass.getMethods(); for (int i=0; i<methods.length; i++) { if (methods[i].getName().equalsIgnoreCase(method) && methods[i].getParameterTypes().length == args.length) { - setResult(result, methods[i].invoke(object, args)); - return; + matches.addElement(methods[i]); } } // try a second time with the object itself, if it is of type Class - if (!(jclass instanceof Class) || (jclass==object)) break; + if (!(object instanceof Class) || (jclass==object)) break; } + + Method selected = select(matches, args); + if (selected == null) throw new NoSuchMethodException(method); - throw new NoSuchMethodException(method); + Object coercedArgs[] = coerce(selected, args); + setResult(result, selected.invoke(object, coercedArgs)); } catch (Exception e) { setException(result, e); @@ -180,7 +262,7 @@ } // try a second time with the object itself, if it is of type Class - if (!(jclass instanceof Class) || (jclass==object)) break; + if (!(object instanceof Class) || (jclass==object)) break; } } catch (Exception e) {