content: /*
   * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package openjdk.tools.classfile;
  
  import java.util.Map;
  
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Class_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Dynamic_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Double_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Fieldref_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Float_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Integer_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_InterfaceMethodref_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Long_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_MethodType_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Methodref_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Module_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_NameAndType_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Package_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_String_info;
  import openjdk.tools.classfile.ConstantPool.CONSTANT_Utf8_info;
  import openjdk.tools.classfile.ConstantPool.CPInfo;
  
  /**
   * Rewrites a class file using a map of translations.
   *
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  public class ClassTranslator
          implements ConstantPool.Visitor<ConstantPool.CPInfo,Map<Object,Object>> {
      /**
       * Create a new ClassFile from {@code cf}, such that for all entries
       * {@code k&nbsp;-\&gt;&nbsp;v} in {@code translations},
       * each occurrence of {@code k} in {@code cf} will be replaced by {@code v}.
       * in
       * @param cf the class file to be processed
       * @param translations the set of translations to be applied
       * @return a copy of {@code} with the values in {@code translations} substituted
       */
      public ClassFile translate(ClassFile cf, Map<Object,Object> translations) {
          ClassFile cf2 = (ClassFile) translations.get(cf);
          if (cf2 == null) {
              ConstantPool constant_pool2 = translate(cf.constant_pool, translations);
              Field[] fields2 = translate(cf.fields, cf.constant_pool, translations);
              Method[] methods2 = translateMethods(cf.methods, cf.constant_pool, translations);
              Attributes attributes2 = translateAttributes(cf.attributes, cf.constant_pool,
                      translations);
  
              if (constant_pool2 == cf.constant_pool &&
                      fields2 == cf.fields &&
                      methods2 == cf.methods &&
                      attributes2 == cf.attributes)
                  cf2 = cf;
              else
                  cf2 = new ClassFile(
                          cf.magic,
                          cf.minor_version,
                          cf.major_version,
                          constant_pool2,
                          cf.access_flags,
                          cf.this_class,
                          cf.super_class,
                          cf.interfaces,
                          fields2,
                          methods2,
                          attributes2);
              translations.put(cf, cf2);
          }
          return cf2;
      }
  
      ConstantPool translate(ConstantPool cp, Map<Object,Object> translations) {
          ConstantPool cp2 = (ConstantPool) translations.get(cp);
          if (cp2 == null) {
              ConstantPool.CPInfo[] pool2 = new ConstantPool.CPInfo[cp.size()];
              boolean eq = true;
              for (int i = 0; i < cp.size(); ) {
                  ConstantPool.CPInfo cpInfo;
                  try {
                      cpInfo = cp.get(i);
                  } catch (ConstantPool.InvalidIndex e) {
                      throw new IllegalStateException(e);
                  }
                  ConstantPool.CPInfo cpInfo2 = translate(cpInfo, translations);
                  eq &= (cpInfo == cpInfo2);
                  pool2[i] = cpInfo2;
                  if (cpInfo.getTag() != cpInfo2.getTag())
                      throw new IllegalStateException();
                  i += cpInfo.size();
              }
  
              if (eq)
                  cp2 = cp;
              else
                  cp2 = new ConstantPool(pool2);
  
              translations.put(cp, cp2);
          }
          return cp2;
      }
  
      ConstantPool.CPInfo translate(ConstantPool.CPInfo cpInfo, Map<Object,Object> translations) {
          ConstantPool.CPInfo cpInfo2 = (ConstantPool.CPInfo) translations.get(cpInfo);
          if (cpInfo2 == null) {
              cpInfo2 = cpInfo.accept(this, translations);
              translations.put(cpInfo, cpInfo2);
          }
          return cpInfo2;
      }
  
      Field[] translate(Field[] fields, ConstantPool constant_pool, Map<Object,Object> translations) {
          Field[] fields2 = (Field[]) translations.get(fields);
          if (fields2 == null) {
              fields2 = new Field[fields.length];
              for (int i = 0; i < fields.length; i++)
                  fields2[i] = translate(fields[i], constant_pool, translations);
              if (equal(fields, fields2))
                  fields2 = fields;
              translations.put(fields, fields2);
          }
          return fields2;
      }
  
      Field translate(Field field, ConstantPool constant_pool, Map<Object,Object> translations) {
          Field field2 = (Field) translations.get(field);
          if (field2 == null) {
              Attributes attributes2 = translateAttributes(field.attributes, constant_pool,
                      translations);
  
              if (attributes2 == field.attributes)
                  field2 = field;
              else
                  field2 = new Field(
                          field.access_flags,
                          field.name_index,
                          field.descriptor,
                          attributes2);
              translations.put(field, field2);
          }
          return field2;
      }
  
      Method[] translateMethods(Method[] methods, ConstantPool constant_pool, Map<Object,Object> translations) {
          Method[] methods2 = (Method[]) translations.get(methods);
          if (methods2 == null) {
              methods2 = new Method[methods.length];
              for (int i = 0; i < methods.length; i++)
                  methods2[i] = translate(methods[i], constant_pool, translations);
              if (equal(methods, methods2))
                  methods2 = methods;
              translations.put(methods, methods2);
          }
          return methods2;
      }
  
      Method translate(Method method, ConstantPool constant_pool, Map<Object,Object> translations) {
          Method method2 = (Method) translations.get(method);
          if (method2 == null) {
              Attributes attributes2 = translateAttributes(method.attributes, constant_pool,
                      translations);
  
              if (attributes2 == method.attributes)
                  method2 = method;
              else
                  method2 = new Method(
                          method.access_flags,
                          method.name_index,
                          method.descriptor,
                          attributes2);
              translations.put(method, method2);
          }
          return method2;
      }
  
      Attributes translateAttributes(Attributes attributes,
              ConstantPool constant_pool, Map<Object,Object> translations) {
          Attributes attributes2 = (Attributes) translations.get(attributes);
          if (attributes2 == null) {
              Attribute[] attrArray2 = new Attribute[attributes.size()];
              ConstantPool constant_pool2 = translate(constant_pool, translations);
              boolean attrsEqual = true;
              for (int i = 0; i < attributes.size(); i++) {
                  Attribute attr = attributes.get(i);
                  Attribute attr2 = translate(attr, translations);
                  if (attr2 != attr)
                      attrsEqual = false;
                  attrArray2[i] = attr2;
              }
              if ((constant_pool2 == constant_pool) && attrsEqual)
                  attributes2 = attributes;
              else
                  attributes2 = new Attributes(constant_pool2, attrArray2);
              translations.put(attributes, attributes2);
          }
          return attributes2;
      }
  
      Attribute translate(Attribute attribute, Map<Object,Object> translations) {
          Attribute attribute2 = (Attribute) translations.get(attribute);
          if (attribute2 == null) {
              attribute2 = attribute; // don't support translation within attributes yet
                                      // (what about Code attribute)
              translations.put(attribute, attribute2);
          }
          return attribute2;
      }
  
      private static <T> boolean equal(T[] a1, T[] a2) {
          if (a1 == null || a2 == null)
              return (a1 == a2);
          if (a1.length != a2.length)
              return false;
          for (int i = 0; i < a1.length; i++) {
              if (a1[i] != a2[i])
                  return false;
          }
          return true;
      }
  
      @Override
      public CPInfo visitClass(CONSTANT_Class_info info, Map<Object, Object> translations) {
          CONSTANT_Class_info info2 = (CONSTANT_Class_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_Class_info(cp2, info.name_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitDouble(CONSTANT_Double_info info, Map<Object, Object> translations) {
          CONSTANT_Double_info info2 = (CONSTANT_Double_info) translations.get(info);
          if (info2 == null) {
              info2 = info;
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitFieldref(CONSTANT_Fieldref_info info, Map<Object, Object> translations) {
          CONSTANT_Fieldref_info info2 = (CONSTANT_Fieldref_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_Fieldref_info(cp2, info.class_index, info.name_and_type_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitFloat(CONSTANT_Float_info info, Map<Object, Object> translations) {
          CONSTANT_Float_info info2 = (CONSTANT_Float_info) translations.get(info);
          if (info2 == null) {
              info2 = info;
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitInteger(CONSTANT_Integer_info info, Map<Object, Object> translations) {
          CONSTANT_Integer_info info2 = (CONSTANT_Integer_info) translations.get(info);
          if (info2 == null) {
              info2 = info;
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Map<Object, Object> translations) {
          CONSTANT_InterfaceMethodref_info info2 = (CONSTANT_InterfaceMethodref_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_InterfaceMethodref_info(cp2, info.class_index, info.name_and_type_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Map<Object, Object> translations) {
          CONSTANT_InvokeDynamic_info info2 = (CONSTANT_InvokeDynamic_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp) {
                  info2 = info;
              } else {
                  info2 = new CONSTANT_InvokeDynamic_info(cp2, info.bootstrap_method_attr_index, info.name_and_type_index);
              }
              translations.put(info, info2);
          }
          return info;
      }
  
      public CPInfo visitDynamicConstant(CONSTANT_Dynamic_info info, Map<Object, Object> translations) {
          CONSTANT_Dynamic_info info2 = (CONSTANT_Dynamic_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp) {
                  info2 = info;
              } else {
                  info2 = new CONSTANT_Dynamic_info(cp2, info.bootstrap_method_attr_index, info.name_and_type_index);
              }
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitLong(CONSTANT_Long_info info, Map<Object, Object> translations) {
          CONSTANT_Long_info info2 = (CONSTANT_Long_info) translations.get(info);
          if (info2 == null) {
              info2 = info;
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitMethodref(CONSTANT_Methodref_info info, Map<Object, Object> translations) {
          CONSTANT_Methodref_info info2 = (CONSTANT_Methodref_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_Methodref_info(cp2, info.class_index, info.name_and_type_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitMethodHandle(CONSTANT_MethodHandle_info info, Map<Object, Object> translations) {
          CONSTANT_MethodHandle_info info2 = (CONSTANT_MethodHandle_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp) {
                  info2 = info;
              } else {
                  info2 = new CONSTANT_MethodHandle_info(cp2, info.reference_kind, info.reference_index);
              }
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitMethodType(CONSTANT_MethodType_info info, Map<Object, Object> translations) {
          CONSTANT_MethodType_info info2 = (CONSTANT_MethodType_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp) {
                  info2 = info;
              } else {
                  info2 = new CONSTANT_MethodType_info(cp2, info.descriptor_index);
              }
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitModule(CONSTANT_Module_info info, Map<Object, Object> translations) {
          CONSTANT_Module_info info2 = (CONSTANT_Module_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_Module_info(cp2, info.name_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitNameAndType(CONSTANT_NameAndType_info info, Map<Object, Object> translations) {
          CONSTANT_NameAndType_info info2 = (CONSTANT_NameAndType_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_NameAndType_info(cp2, info.name_index, info.type_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitPackage(CONSTANT_Package_info info, Map<Object, Object> translations) {
          CONSTANT_Package_info info2 = (CONSTANT_Package_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_Package_info(cp2, info.name_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitString(CONSTANT_String_info info, Map<Object, Object> translations) {
          CONSTANT_String_info info2 = (CONSTANT_String_info) translations.get(info);
          if (info2 == null) {
              ConstantPool cp2 = translate(info.cp, translations);
              if (cp2 == info.cp)
                  info2 = info;
              else
                  info2 = new CONSTANT_String_info(cp2, info.string_index);
              translations.put(info, info2);
          }
          return info;
      }
  
      @Override
      public CPInfo visitUtf8(CONSTANT_Utf8_info info, Map<Object, Object> translations) {
          CONSTANT_Utf8_info info2 = (CONSTANT_Utf8_info) translations.get(info);
          if (info2 == null) {
              info2 = info;
              translations.put(info, info2);
          }
          return info;
      }
  
  }
  