content: /*
   * 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.taobao.android.dx.dex.code;
  
  import com.taobao.android.dx.rop.cst.CstType;
  import com.taobao.android.dx.util.FixedSizeList;
  import com.taobao.android.dx.util.Hex;
  
  /**
   * Ordered list of (exception type, handler address) entries.
   */
  public final class CatchHandlerList extends FixedSizeList
          implements Comparable<CatchHandlerList> {
      /** {@code non-null;} empty instance */
      public static final CatchHandlerList EMPTY = new CatchHandlerList(0);
  
      /**
       * Constructs an instance. All indices initially contain {@code null}.
       *
       * @param size {@code >= 0;} the size of the list
       */
      public CatchHandlerList(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 Entry get(int n) {
          return (Entry) get0(n);
      }
  
      /** {@inheritDoc} */
      public String toHuman() {
          return toHuman("", "");
      }
  
      /**
       * Get the human form of this instance, prefixed on each line
       * with the string.
       *
       * @param prefix {@code non-null;} the prefix for every line
       * @param header {@code non-null;} the header for the first line (after the
       * first prefix)
       * @return {@code non-null;} the human form
       */
      public String toHuman(String prefix, String header) {
          StringBuilder sb = new StringBuilder(100);
          int size = size();
  
          sb.append(prefix);
          sb.append(header);
          sb.append("catch ");
  
          for (int i = 0; i < size; i++) {
              Entry entry = get(i);
  
              if (i != 0) {
                  sb.append(",\n");
                  sb.append(prefix);
                  sb.append("  ");
              }
  
              if ((i == (size - 1)) && catchesAll()) {
                  sb.append("<any>");
              } else {
                  sb.append(entry.getExceptionType().toHuman());
              }
  
              sb.append(" -> ");
              sb.append(Hex.u2or4(entry.getHandler()));
          }
  
          return sb.toString();
      }
  
      /**
       * Returns whether or not this instance ends with a "catch-all"
       * handler.
       *
       * @return {@code true} if this instance ends with a "catch-all"
       * handler or {@code false} if not
       */
      public boolean catchesAll() {
          int size = size();
  
          if (size == 0) {
              return false;
          }
  
          Entry last = get(size - 1);
          return last.getExceptionType().equals(CstType.OBJECT);
      }
  
      /**
       * Sets the entry at the given index.
       *
       * @param n {@code >= 0, < size();} which index
       * @param exceptionType {@code non-null;} type of exception handled
       * @param handler {@code >= 0;} exception handler address
       */
      public void set(int n, CstType exceptionType, int handler) {
          set0(n, new Entry(exceptionType, handler));
      }
  
      /**
       * Sets the entry at the given index.
       *
       * @param n {@code >= 0, < size();} which index
       * @param entry {@code non-null;} the entry to set at {@code n}
       */
      public void set(int n, Entry entry) {
          set0(n, entry);
      }
  
      /** {@inheritDoc} */
      public int compareTo(CatchHandlerList other) {
          if (this == other) {
              // Easy out.
              return 0;
          }
  
          int thisSize = size();
          int otherSize = other.size();
          int checkSize = Math.min(thisSize, otherSize);
  
          for (int i = 0; i < checkSize; i++) {
              Entry thisEntry = get(i);
              Entry otherEntry = other.get(i);
              int compare = thisEntry.compareTo(otherEntry);
              if (compare != 0) {
                  return compare;
              }
          }
  
          if (thisSize < otherSize) {
              return -1;
          } else if (thisSize > otherSize) {
              return 1;
          }
  
          return 0;
      }
  
      /**
       * Entry in the list.
       */
      public static class Entry implements Comparable<Entry> {
          /** {@code non-null;} type of exception handled */
          private final CstType exceptionType;
  
          /** {@code >= 0;} exception handler address */
          private final int handler;
  
          /**
           * Constructs an instance.
           *
           * @param exceptionType {@code non-null;} type of exception handled
           * @param handler {@code >= 0;} exception handler address
           */
          public Entry(CstType exceptionType, int handler) {
              if (handler < 0) {
                  throw new IllegalArgumentException("handler < 0");
              }
  
              if (exceptionType == null) {
                  throw new NullPointerException("exceptionType == null");
              }
  
              this.handler = handler;
              this.exceptionType = exceptionType;
          }
  
          /** {@inheritDoc} */
          @Override
          public int hashCode() {
              return (handler * 31) + exceptionType.hashCode();
          }
  
          /** {@inheritDoc} */
          @Override
          public boolean equals(Object other) {
              if (other instanceof Entry) {
                  return (compareTo((Entry) other) == 0);
              }
  
              return false;
          }
  
          /** {@inheritDoc} */
          public int compareTo(Entry other) {
              if (handler < other.handler) {
                  return -1;
              } else if (handler > other.handler) {
                  return 1;
              }
  
              return exceptionType.compareTo(other.exceptionType);
          }
  
          /**
           * Gets the exception type handled.
           *
           * @return {@code non-null;} the exception type
           */
          public CstType getExceptionType() {
              return exceptionType;
          }
  
          /**
           * Gets the handler address.
           *
           * @return {@code >= 0;} the handler address
           */
          public int getHandler() {
              return handler;
          }
      }
  }
  