text: /*
   * Copyright (C) 2008 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.mdit.library.dx.dex.file;
  
  import com.mdit.library.dx.dex.SizeOf;
  import com.mdit.library.dx.rop.cst.CstString;
  import com.mdit.library.dx.rop.type.Prototype;
  import com.mdit.library.dx.rop.type.StdTypeList;
  import com.mdit.library.dx.rop.type.Type;
  import com.mdit.library.dx.util.AnnotatedOutput;
  import com.mdit.library.dx.util.Hex;
  
  /**
   * Representation of a method prototype reference inside a Dalvik file.
   */
  public final class ProtoIdItem extends IndexedItem {
      /** {@code non-null;} the wrapped prototype */
      private final Prototype prototype;
  
      /** {@code non-null;} the short-form of the prototype */
      private final CstString shortForm;
  
      /**
       * {@code null-ok;} the list of parameter types or {@code null} if this
       * prototype has no parameters
       */
      private TypeListItem parameterTypes;
  
      /**
       * Constructs an instance.
       *
       * @param prototype {@code non-null;} the constant for the prototype
       */
      public ProtoIdItem(Prototype prototype) {
          if (prototype == null) {
              throw new NullPointerException("prototype == null");
          }
  
          this.prototype = prototype;
          this.shortForm = makeShortForm(prototype);
  
          StdTypeList parameters = prototype.getParameterTypes();
          this.parameterTypes = (parameters.size() == 0) ? null
              : new TypeListItem(parameters);
      }
  
      /**
       * Creates the short-form of the given prototype.
       *
       * @param prototype {@code non-null;} the prototype
       * @return {@code non-null;} the short form
       */
      private static CstString makeShortForm(Prototype prototype) {
          StdTypeList parameters = prototype.getParameterTypes();
          int size = parameters.size();
          StringBuilder sb = new StringBuilder(size + 1);
  
          sb.append(shortFormCharFor(prototype.getReturnType()));
  
          for (int i = 0; i < size; i++) {
              sb.append(shortFormCharFor(parameters.getType(i)));
          }
  
          return new CstString(sb.toString());
      }
  
      /**
       * Gets the short-form character for the given type.
       *
       * @param type {@code non-null;} the type
       * @return the corresponding short-form character
       */
      private static char shortFormCharFor(Type type) {
          char descriptorChar = type.getDescriptor().charAt(0);
  
          if (descriptorChar == '[') {
              return 'L';
          }
  
          return descriptorChar;
      }
  
      /** {@inheritDoc} */
      @Override
      public ItemType itemType() {
          return ItemType.TYPE_PROTO_ID_ITEM;
      }
  
      /** {@inheritDoc} */
      @Override
      public int writeSize() {
          return SizeOf.PROTO_ID_ITEM;
      }
  
      /** {@inheritDoc} */
      @Override
      public void addContents(DexFile file) {
          StringIdsSection stringIds = file.getStringIds();
          TypeIdsSection typeIds = file.getTypeIds();
          MixedItemSection typeLists = file.getTypeLists();
  
          typeIds.intern(prototype.getReturnType());
          stringIds.intern(shortForm);
  
          if (parameterTypes != null) {
              parameterTypes = typeLists.intern(parameterTypes);
          }
      }
  
      /** {@inheritDoc} */
      @Override
      public void writeTo(DexFile file, AnnotatedOutput out) {
          int shortyIdx = file.getStringIds().indexOf(shortForm);
          int returnIdx = file.getTypeIds().indexOf(prototype.getReturnType());
          int paramsOff = OffsettedItem.getAbsoluteOffsetOr0(parameterTypes);
  
          if (out.annotates()) {
              StringBuilder sb = new StringBuilder();
              sb.append(prototype.getReturnType().toHuman());
              sb.append(" proto(");
  
              StdTypeList params = prototype.getParameterTypes();
              int size = params.size();
  
              for (int i = 0; i < size; i++) {
                  if (i != 0) {
                      sb.append(", ");
                  }
                  sb.append(params.getType(i).toHuman());
              }
  
              sb.append(")");
              out.annotate(0, indexString() + ' ' + sb.toString());
              out.annotate(4, "  shorty_idx:      " + Hex.u4(shortyIdx) +
                      " // " + shortForm.toQuoted());
              out.annotate(4, "  return_type_idx: " + Hex.u4(returnIdx) +
                      " // " + prototype.getReturnType().toHuman());
              out.annotate(4, "  parameters_off:  " + Hex.u4(paramsOff));
          }
  
          out.writeInt(shortyIdx);
          out.writeInt(returnIdx);
          out.writeInt(paramsOff);
      }
  }
  