content: /*
   * Copyright (C) 2007 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.taobao.android.dx.dex.file;
  
  import com.taobao.android.dex.Leb128;
  import com.taobao.android.dx.dex.code.DalvCode;
  import com.taobao.android.dx.rop.code.AccessFlags;
  import com.taobao.android.dx.rop.cst.CstMethodRef;
  import com.taobao.android.dx.rop.cst.CstString;
  import com.taobao.android.dx.rop.type.TypeList;
  import com.taobao.android.dx.util.AnnotatedOutput;
  import com.taobao.android.dx.util.Hex;
  import java.io.PrintWriter;
  
  /**
   * Class that representats a method of a class.
   */
  public final class EncodedMethod extends EncodedMember
          implements Comparable<EncodedMethod> {
      /** {@code non-null;} constant for the method */
      private final CstMethodRef method;
  
      /**
       * {@code null-ok;} code for the method, if the method is neither
       * {@code abstract} nor {@code native}
       */
      private final CodeItem code;
  
      /**
       * Constructs an instance.
       *
       * @param method {@code non-null;} constant for the method
       * @param accessFlags access flags
       * @param code {@code null-ok;} code for the method, if it is neither
       * {@code abstract} nor {@code native}
       * @param throwsList {@code non-null;} list of possibly-thrown exceptions,
       * just used in generating debugging output (listings)
       */
      public EncodedMethod(CstMethodRef method, int accessFlags,
              DalvCode code, TypeList throwsList) {
          super(accessFlags);
  
          if (method == null) {
              throw new NullPointerException("method == null");
          }
  
          this.method = method;
  
          if (code == null) {
              this.code = null;
          } else {
              boolean isStatic = (accessFlags & AccessFlags.ACC_STATIC) != 0;
              this.code = new CodeItem(method, code, isStatic, throwsList);
          }
      }
  
      /** {@inheritDoc} */
      public boolean equals(Object other) {
          if (! (other instanceof EncodedMethod)) {
              return false;
          }
  
          return compareTo((EncodedMethod) other) == 0;
      }
  
      /**
       * {@inheritDoc}
       *
       * <p><b>Note:</b> This compares the method constants only,
       * ignoring any associated code, because it should never be the
       * case that two different items with the same method constant
       * ever appear in the same list (or same file, even).</p>
       */
      public int compareTo(EncodedMethod other) {
          return method.compareTo(other.method);
      }
  
      /** {@inheritDoc} */
      @Override
      public String toString() {
          StringBuffer sb = new StringBuffer(100);
  
          sb.append(getClass().getName());
          sb.append('{');
          sb.append(Hex.u2(getAccessFlags()));
          sb.append(' ');
          sb.append(method);
  
          if (code != null) {
              sb.append(' ');
              sb.append(code);
          }
  
          sb.append('}');
  
          return sb.toString();
      }
  
      /** {@inheritDoc} */
      @Override
      public void addContents(DexFile file) {
          MethodIdsSection methodIds = file.getMethodIds();
          MixedItemSection wordData = file.getWordData();
  
          methodIds.intern(method);
  
          if (code != null) {
              wordData.add(code);
          }
      }
  
      /** {@inheritDoc} */
      public final String toHuman() {
          return method.toHuman();
      }
  
      /** {@inheritDoc} */
      @Override
      public final CstString getName() {
          return method.getNat().getName();
      }
  
      /** {@inheritDoc} */
      @Override
      public void debugPrint(PrintWriter out, boolean verbose) {
          if (code == null) {
              out.println(getRef().toHuman() + ": abstract or native");
          } else {
              code.debugPrint(out, "  ", verbose);
          }
      }
  
      /**
       * Gets the constant for the method.
       *
       * @return {@code non-null;} the constant
       */
      public final CstMethodRef getRef() {
          return method;
      }
  
      /** {@inheritDoc} */
      @Override
      public int encode(DexFile file, AnnotatedOutput out,
              int lastIndex, int dumpSeq) {
          int methodIdx = file.getMethodIds().indexOf(method);
          int diff = methodIdx - lastIndex;
          int accessFlags = getAccessFlags();
          int codeOff = OffsettedItem.getAbsoluteOffsetOr0(code);
          boolean hasCode = (codeOff != 0);
          boolean shouldHaveCode = (accessFlags &
                  (AccessFlags.ACC_ABSTRACT | AccessFlags.ACC_NATIVE)) == 0;
  
          /*
           * Verify that code appears if and only if a method is
           * declared to have it.
           */
          if (hasCode != shouldHaveCode) {
              throw new UnsupportedOperationException(
                      "code vs. access_flags mismatch");
          }
  
          if (out.annotates()) {
              out.annotate(0, String.format("  [%x] %s", dumpSeq,
                              method.toHuman()));
              out.annotate(Leb128.unsignedLeb128Size(diff),
                      "    method_idx:   " + Hex.u4(methodIdx));
              out.annotate(Leb128.unsignedLeb128Size(accessFlags),
                      "    access_flags: " +
                      AccessFlags.methodString(accessFlags));
              out.annotate(Leb128.unsignedLeb128Size(codeOff),
                      "    code_off:     " + Hex.u4(codeOff));
          }
  
          out.writeUleb128(diff);
          out.writeUleb128(accessFlags);
          out.writeUleb128(codeOff);
  
          return methodIdx;
      }
  }
  