1 /*
   2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package vm.runtime.defmeth.shared.data;
  25 
  26 import vm.runtime.defmeth.shared.data.AbstractVisitor;
  27 import vm.runtime.defmeth.shared.data.method.param.*;
  28 import vm.runtime.defmeth.shared.executor.AbstractReflectionTest;
  29 
  30 /**
  31  * Extracts a value from Param object.
  32  * It is used when method is invoked using Reflection API
  33  * or through MethodHandle.invokeWithArguments.
  34  */
  35 public class ParamValueExtractor extends AbstractVisitor {
  36     private Object value;
  37     private AbstractReflectionTest methodInvokeTest;
  38 
  39     public Object value() {
  40         param.visit(this);
  41         return value;
  42     }
  43 
  44     private Param param;
  45     public ParamValueExtractor(AbstractReflectionTest methodInvokeTest, Param param) {
  46         this.methodInvokeTest = methodInvokeTest;
  47         this.param = param; }
  48 
  49     @Override public void visitParamInt(IntParam i) { value = i.value(); }
  50     @Override public void visitParamLong(LongParam l) { value = l.value(); }
  51     @Override public void visitParamFloat(FloatParam f) { value = f.value(); }
  52     @Override public void visitParamDouble(DoubleParam d) { value = d.value(); }
  53     @Override public void visitParamString(StringParam str) { value = str.value(); }
  54     @Override public void visitParamNull() { value = null; }
  55     @Override public void visitParamNewInstance(NewInstanceParam type) {
  56         try {
  57             value = methodInvokeTest.resolve(type.clazz()).newInstance();
  58         } catch (InstantiationException | IllegalAccessException e) {
  59             throw new Error(e);
  60         }
  61     }
  62 }