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Diffstat (limited to 'plugins/org.eclipse.jem.proxy/proxyCommon/org/eclipse/jem/internal/proxy/common/MethodHelper.java')
-rw-r--r--plugins/org.eclipse.jem.proxy/proxyCommon/org/eclipse/jem/internal/proxy/common/MethodHelper.java272
1 files changed, 0 insertions, 272 deletions
diff --git a/plugins/org.eclipse.jem.proxy/proxyCommon/org/eclipse/jem/internal/proxy/common/MethodHelper.java b/plugins/org.eclipse.jem.proxy/proxyCommon/org/eclipse/jem/internal/proxy/common/MethodHelper.java
deleted file mode 100644
index 3bceb66e4..000000000
--- a/plugins/org.eclipse.jem.proxy/proxyCommon/org/eclipse/jem/internal/proxy/common/MethodHelper.java
+++ /dev/null
@@ -1,272 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2001, 2006 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package org.eclipse.jem.internal.proxy.common;
-import java.lang.reflect.*;
-import java.text.MessageFormat;
-import java.util.*;
-
-/**
- * This is a class to do message/constructor work.
- * Specifically to find the most appropriate method.
- */
-public class MethodHelper {
-
- /*
- * The class that is used to represent Null class type.
- *
- * @since 1.0.0
- */
- private static class NULL_CLASS {
- }
-
- public static final Class NULL_TYPE = NULL_CLASS.class;
-
- static final ArrayList sPrimitivesOrder;
- static final int sCharPos;
-
- static {
- sPrimitivesOrder = new ArrayList(6);
- sPrimitivesOrder.add(Byte.TYPE);
- sPrimitivesOrder.add(Short.TYPE);
- sPrimitivesOrder.add(Integer.TYPE);
- sPrimitivesOrder.add(Long.TYPE);
- sPrimitivesOrder.add(Float.TYPE);
- sPrimitivesOrder.add(Double.TYPE);
-
- // char can be treated like a short for purposes of ordering.
- sCharPos = sPrimitivesOrder.indexOf(Short.TYPE);
- }
-
- /**
- * Return whether the type2 can be assigned to type1 in
- * method argument conversion.
- */
- public static boolean isAssignableFrom(Class type1, Class type2) {
- if (type1 == type2)
- return true; // They're the same, so assignable.
- if (type1.isPrimitive()) {
- if (type2.isPrimitive()) {
- if (type1 == Boolean.TYPE || type2 == Boolean.TYPE)
- return false; // Since not equal and one is boolean and the other isn't, not assignable
- int type1Pos = (type1 != Character.TYPE) ? sPrimitivesOrder.indexOf(type1) : sCharPos;
- int type2Pos = (type2 != Character.TYPE) ? sPrimitivesOrder.indexOf(type2) : sCharPos;
- return type1Pos > type2Pos; // It can be widened if type1 is higher in the order
- }
- return false; // primitive to non-primitive, not assignable.
- } else
- if (type2 == NULL_TYPE)
- return true; // NULL_TYPE represents null for us, and null can be assigned to any object
- else
- return type1.isAssignableFrom(type2); // Can type2 be assigned to type1
- }
-
-
- /**
- * Every entry in Array2 can be assigned to the corresponding entry in Array1.
- */
- public static boolean isAssignableFrom(Class[] types1, Class[] types2) {
- if (types1.length != types2.length)
- return false; // Not the same size, so not compatible.
- for (int i=0; i<types1.length; i++) {
- if (!isAssignableFrom(types1[i], types2[i]))
- return false;
- }
- return true; // All are assignable
- }
-
- /**
- * Return the index of the most compatible method/constructor from the lists passed in.
- * MethodsList: List of methods (if null then this is for constructors)
- * ParmsList: List of parms for each method (each entry will be Class[]).
- */
- private static int findMostCompatible(List methods, List parms, String ambiguousName) throws AmbiguousMethodException {
- // The algorithm used is from the Java Language Specification 15.12.2.2
- // Find the maximally specific ones
- // This is defined as the one that is more specific then all of the rest.
- // If there are duplicates parms that are maximally specific, then it doesn't matter which choosen
- // because when invoked the JVM will make sure the right thing is done.
- //
- Class[][] parmsCopy = (Class[][]) parms.toArray(new Class[parms.size()][]);
- int size = parmsCopy.length;
- // For each entry see if it is maximally specific, i.e. it is more specific then all of the others.
-nextMethod: for (int i=0; i<size; i++) {
- // For ctors we don't need to test the declaring class because it will always be the same class.
- Class dclClassi = methods != null ? ((Method) methods.get(i)).getDeclaringClass() : null;
- Class[] parmsi = parmsCopy[i];
- for (int j=0; j<size; j++) {
- if (i == j)
- continue;
- // Methodi is more specific if
- // a) Methodi declaring class is assignable to Methodj declaring class
- // b) Methodi parms are assignable to Methodj parms
- //
- // First see if Methodi is more specific, if it is
- // then throw out Methodj and continue
- // If Methodi is not compatible to Methodj, go to the next method for i. Methodi is not the most specific
- // Something else is either more specific or none are ma
- if (dclClassi != null) {
- // Step a
- if (!isAssignableFrom(((Method) methods.get(j)).getDeclaringClass(), dclClassi))
- continue nextMethod; // Methodi is not more specific than Methodj, so try next i.
- }
-
- // Step b
- Class[] parmsj = parmsCopy[j];
- if (!isAssignableFrom(parmsj, parmsi)) {
- // Methodi is not more specific than Methodj, so go to next i.
- continue nextMethod;
- }
- }
- return i; // Methodi is more specific than all of the other ones.
- }
-
- throw new AmbiguousMethodException(ambiguousName); // There was not one more specific than all of the others.
- }
-
- /**
- * Find the most compatible method for the given arguments.
- */
- public static Method findCompatibleMethod(Class receiver, String methodName, Class[] arguments) throws NoSuchMethodException, AmbiguousMethodException {
- try {
- return receiver.getMethod(methodName, arguments); // Found exact match in public
- } catch (NoSuchMethodException exc) {
- if (arguments != null) {
- // Need to find most compatible one. We will take protected into consideration (i.e. inheritance).
- ArrayList parmsList = new ArrayList(); // The parm list from each compatible method.
- ArrayList mthdsList = new ArrayList(); // The list of compatible methods, same order as the parms above.
- Class cls = receiver;
- while (cls != null) {
- Method mthds[] = cls.getDeclaredMethods();
- for (int i = 0; i < mthds.length; i++) {
- Method mthd = mthds[i];
- if (!mthd.getName().equals(methodName))
- continue; // Not compatible, not same name
- int modifiers = mthd.getModifiers();
- if (!(Modifier.isPublic(modifiers) || Modifier.isProtected(modifiers)))
- continue; // Will not call private or package-protected because we don't know the context.
- Class[] parms = mthd.getParameterTypes();
- // If exact match we found a non-public exact match, which is good.
- if (Arrays.equals(arguments, parms))
- return makeMethodAccessable(mthd);
- if (!isAssignableFrom(parms, arguments))
- continue; // Not compatible, parms
- // It is compatible with the requested method - now see if we already have an exact match from a subclass. Don't want to add it twice.
- // We are assuming the actual number of compatible methods is small, so this O(n-squared) search is efficient enough.
- int size = parmsList.size();
- for (int j = 0; j < size; j++) {
- if (Arrays.equals(parms, (Object[]) parmsList.get(j)))
- continue;
- }
- parmsList.add(parms);
- mthdsList.add(mthd);
- }
- cls = cls.getSuperclass();
- }
- // Now have list of compatible methods.
- if (parmsList.size() == 0)
- throw throwFixedNoSuchMethod(exc, receiver, methodName, arguments); // None found, so rethrow the exception
- if (parmsList.size() == 1)
- return makeMethodAccessable((Method) mthdsList.get(0)); // Only one, so return it
-
- // Now find the most compatible method
- int mostCompatible = findMostCompatible(mthdsList, parmsList, methodName);
- return makeMethodAccessable((Method) mthdsList.get(mostCompatible));
- } else
- throw throwFixedNoSuchMethod(exc, receiver, methodName, arguments); // None found, so rethrow the exception
- }
- }
-
- private static Method makeMethodAccessable(Method m) {
- m.setAccessible(true); // We allow all access, let ide and compiler handle security.
- return m;
- }
-
- /*
- * NoSuchMEthodExeception doesn't include the signature. Since these are dynamic searches, the exception itself is useless without
- * the signature. So we add it.
- */
- private static NoSuchMethodException throwFixedNoSuchMethod(NoSuchMethodException e, Class declareClass, String methodName, Class[] argClasses) {
-
- // The default trace doesn't show what method was being searched for, so recreate with that.
- StringBuffer s = new StringBuffer();
- s.append(declareClass.getName());
- s.append('.');
- s.append(methodName);
- s.append('(');
- if (argClasses != null) {
- for (int i = 0; i < argClasses.length; i++) {
- if (i > 0)
- s.append(',');
- s.append(argClasses[i].getName());
- }
- }
- s.append(')');
- NoSuchMethodException ne = new NoSuchMethodException(s.toString());
- ne.setStackTrace(e.getStackTrace());
- return ne;
- }
-
-
- /**
- * Find the most compatible constructor for the class with the given arguments.
- * @param receiver class to get the constructor for
- * @param arguments array of argument types
- * @return the constructor
- * @throws NoSuchMethodException no compatible constructor can be found
- * @throws AmbiguousMethodException there is more than one compatible constructor
- * @throws IllegalAccessException it can't be accessed. Such as it is a non-static inner class.
- *
- * @since 1.2.0
- */
- public static Constructor findCompatibleConstructor(Class receiver, Class[] arguments) throws NoSuchMethodException, AmbiguousMethodException, IllegalAccessException {
- if (receiver.getDeclaringClass() != null && !Modifier.isStatic(receiver.getModifiers()))
- throw new IllegalAccessException(MessageFormat.format(Messages.getString("MethodHelper.NONSTATICINNERCLASS_WARNING"), new Object[] {receiver.getName()})); //$NON-NLS-1$
- try {
- java.lang.reflect.Constructor ctor = receiver.getDeclaredConstructor(arguments);
- ctor.setAccessible(true); // We allow all access, let ide and compiler handle security.
- return ctor; // Found exact match
- } catch (NoSuchMethodException exc) {
- if (arguments != null) {
- // Need to find most compatible one.
- java.lang.reflect.Constructor ctors[] = receiver.getDeclaredConstructors();
- ArrayList parmsList = new ArrayList(ctors.length); // The parm list from each compatible method.
- ArrayList ctorsList = new ArrayList(ctors.length); // The list of compatible methods, same order as the parms above.
- for (int i = 0; i < ctors.length; i++) {
- java.lang.reflect.Constructor ctor = ctors[i];
- Class[] parms = ctor.getParameterTypes();
- if (!isAssignableFrom(parms, arguments))
- continue; // Not compatible, parms
- // It is compatible with the requested method
- parmsList.add(parms);
- ctorsList.add(ctor);
- }
-
- // Now have list of compatible methods.
- if (parmsList.size() == 0)
- throw exc; // None found, so rethrow the exception
- if (parmsList.size() == 1) {
- java.lang.reflect.Constructor ctor = (java.lang.reflect.Constructor) ctorsList.get(0); // Only one, so return it
- ctor.setAccessible(true); // We allow all access, let ide and compilor handle security.
- return ctor;
- }
-
- // Now find the most compatible ctor
- int mostCompatible = findMostCompatible(null, parmsList, receiver.getName());
- java.lang.reflect.Constructor ctor = (java.lang.reflect.Constructor) ctorsList.get(mostCompatible);
- ctor.setAccessible(true); // We allow all access, let ide and compilor handle security.
- return ctor;
- } else
- throw exc; // None found, so rethrow the exception
- }
- }
-
-
-}

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