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.rop.code;
  
  import com.taobao.android.dx.util.FixedSizeList;
  
  /**
   * List of {@link Insn} instances.
   */
  public final class InsnList
          extends FixedSizeList {
      /**
       * Constructs an instance. All indices initially contain {@code null}.
       *
       * @param size the size of the list
       */
      public InsnList(int size) {
          super(size);
      }
  
      /**
       * Gets the element at the given index. It is an error to call
       * this with the index for an element which was never set; if you
       * do that, this will throw {@code NullPointerException}.
       *
       * @param n {@code >= 0, < size();} which index
       * @return {@code non-null;} element at that index
       */
      public Insn get(int n) {
          return (Insn) get0(n);
      }
  
      /**
       * Sets the instruction at the given index.
       *
       * @param n {@code >= 0, < size();} which index
       * @param insn {@code non-null;} the instruction to set at {@code n}
       */
      public void set(int n, Insn insn) {
          set0(n, insn);
      }
  
      /**
       * Gets the last instruction. This is just a convenient shorthand for
       * {@code get(size() - 1)}.
       *
       * @return {@code non-null;} the last instruction
       */
      public Insn getLast() {
          return get(size() - 1);
      }
  
      /**
       * Visits each instruction in the list, in order.
       *
       * @param visitor {@code non-null;} visitor to use
       */
      public void forEach(Insn.Visitor visitor) {
          int sz = size();
  
          for (int i = 0; i < sz; i++) {
              get(i).accept(visitor);
          }
      }
  
      /**
       * Compares the contents of this {@code InsnList} with another.
       * The blocks must have the same number of insns, and each Insn must
       * also return true to {@code Insn.contentEquals()}.
       *
       * @param b to compare
       * @return true in the case described above.
       */
      public boolean contentEquals(InsnList b) {
          if (b == null) return false;
  
          int sz = size();
  
          if (sz != b.size()) return false;
  
          for (int i = 0; i < sz; i++) {
              if (!get(i).contentEquals(b.get(i))) {
                  return false;
              }
          }
  
          return true;
      }
  
      /**
       * Returns an instance that is identical to this one, except that
       * the registers in each instruction are offset by the given
       * amount. Mutability of the result is inherited from the
       * original.
       *
       * @param delta the amount to offset register numbers by
       * @return {@code non-null;} an appropriately-constructed instance
       */
      public InsnList withRegisterOffset(int delta) {
          int sz = size();
          InsnList result = new InsnList(sz);
  
          for (int i = 0; i < sz; i++) {
              Insn one = (Insn) get0(i);
              if (one != null) {
                  result.set0(i, one.withRegisterOffset(delta));
              }
          }
  
          if (isImmutable()) {
              result.setImmutable();
          }
  
          return result;
      }
  }
  