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.util.FixedSizeList;
  
  /**
   * Table of catch entries. Each entry includes a range of code
   * addresses for which it is valid and an associated {@link
   * CatchHandlerList}.
   */
  public final class CatchTable extends FixedSizeList
          implements Comparable<CatchTable> {
      /** {@code non-null;} empty instance */
      public static final CatchTable EMPTY = new CatchTable(0);
  
      /**
       * Constructs an instance. All indices initially contain {@code null}.
       *
       * @param size {@code >= 0;} the size of the table
       */
      public CatchTable(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);
      }
  
      /**
       * 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(CatchTable 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 a catch list.
       */
      public static class Entry implements Comparable<Entry> {
          /** {@code >= 0;} start address */
          private final int start;
  
          /** {@code > start;} end address (exclusive) */
          private final int end;
  
          /** {@code non-null;} list of catch handlers */
          private final CatchHandlerList handlers;
  
          /**
           * Constructs an instance.
           *
           * @param start {@code >= 0;} start address
           * @param end {@code > start;} end address (exclusive)
           * @param handlers {@code non-null;} list of catch handlers
           */
          public Entry(int start, int end, CatchHandlerList handlers) {
              if (start < 0) {
                  throw new IllegalArgumentException("start < 0");
              }
  
              if (end <= start) {
                  throw new IllegalArgumentException("end <= start");
              }
  
              if (handlers.isMutable()) {
                  throw new IllegalArgumentException("handlers.isMutable()");
              }
  
              this.start = start;
              this.end = end;
              this.handlers = handlers;
          }
  
          /** {@inheritDoc} */
          @Override
          public int hashCode() {
              int hash = (start * 31) + end;
              hash = (hash * 31) + handlers.hashCode();
              return hash;
          }
  
          /** {@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 (start < other.start) {
                  return -1;
              } else if (start > other.start) {
                  return 1;
              }
  
              if (end < other.end) {
                  return -1;
              } else if (end > other.end) {
                  return 1;
              }
  
              return handlers.compareTo(other.handlers);
          }
  
          /**
           * Gets the start address.
           *
           * @return {@code >= 0;} the start address
           */
          public int getStart() {
              return start;
          }
  
          /**
           * Gets the end address (exclusive).
           *
           * @return {@code > start;} the end address (exclusive)
           */
          public int getEnd() {
              return end;
          }
  
          /**
           * Gets the handlers.
           *
           * @return {@code non-null;} the handlers
           */
          public CatchHandlerList getHandlers() {
              return handlers;
          }
      }
  }
  