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.dx.rop.cst.Constant;
  import com.taobao.android.dx.rop.cst.CstNat;
  import com.taobao.android.dx.rop.cst.CstString;
  import com.taobao.android.dx.util.AnnotatedOutput;
  import com.taobao.android.dx.util.Hex;
  import java.util.Collection;
  import java.util.TreeMap;
  
  /**
   * Strings list section of a {@code .dex} file.
   */
  public final class StringIdsSection
          extends UniformItemSection {
      /**
       * {@code non-null;} map from string constants to {@link
       * StringIdItem} instances
       */
      private final TreeMap<CstString, StringIdItem> strings;
  
      /**
       * Constructs an instance. The file offset is initially unknown.
       *
       * @param file {@code non-null;} file that this instance is part of
       */
      public StringIdsSection(DexFile file) {
          super("string_ids", file, 4);
  
          strings = new TreeMap<CstString, StringIdItem>();
      }
  
      /** {@inheritDoc} */
      @Override
      public Collection<? extends Item> items() {
          return strings.values();
      }
  
      /** {@inheritDoc} */
      @Override
      public IndexedItem get(Constant cst) {
          if (cst == null) {
              throw new NullPointerException("cst == null");
          }
  
          throwIfNotPrepared();
  
          IndexedItem result = strings.get((CstString) cst);
  
          if (result == null) {
              throw new IllegalArgumentException("not found");
          }
  
          return result;
      }
  
      /**
       * Writes the portion of the file header that refers to this instance.
       *
       * @param out {@code non-null;} where to write
       */
      public void writeHeaderPart(AnnotatedOutput out) {
          throwIfNotPrepared();
  
          int sz = strings.size();
          int offset = (sz == 0) ? 0 : getFileOffset();
  
          if (out.annotates()) {
              out.annotate(4, "string_ids_size: " + Hex.u4(sz));
              out.annotate(4, "string_ids_off:  " + Hex.u4(offset));
          }
  
          out.writeInt(sz);
          out.writeInt(offset);
      }
  
      /**
       * Interns an element into this instance.
       *
       * @param string {@code non-null;} the string to intern, as a regular Java
       * {@code String}
       * @return {@code non-null;} the interned string
       */
      public StringIdItem intern(String string) {
          return intern(new StringIdItem(new CstString(string)));
      }
  
      /**
       * Interns an element into this instance.
       *
       * @param string {@code non-null;} the string to intern, as a constant
       * @return {@code non-null;} the interned string
       */
      public StringIdItem intern(CstString string) {
          return intern(new StringIdItem(string));
      }
  
      /**
       * Interns an element into this instance.
       *
       * @param string {@code non-null;} the string to intern
       * @return {@code non-null;} the interned string
       */
      public synchronized StringIdItem intern(StringIdItem string) {
          if (string == null) {
              throw new NullPointerException("string == null");
          }
  
          throwIfPrepared();
  
          CstString value = string.getValue();
          StringIdItem already = strings.get(value);
  
          if (already != null) {
              return already;
          }
  
          strings.put(value, string);
          return string;
      }
  
      /**
       * Interns the components of a name-and-type into this instance.
       *
       * @param nat {@code non-null;} the name-and-type
       */
      public synchronized void intern(CstNat nat) {
          intern(nat.getName());
          intern(nat.getDescriptor());
      }
  
      /**
       * Gets the index of the given string, which must have been added
       * to this instance.
       *
       * @param string {@code non-null;} the string to look up
       * @return {@code >= 0;} the string's index
       */
      public int indexOf(CstString string) {
          if (string == null) {
              throw new NullPointerException("string == null");
          }
  
          throwIfNotPrepared();
  
          StringIdItem s = strings.get(string);
  
          if (s == null) {
              throw new IllegalArgumentException("not found");
          }
  
          return s.getIndex();
      }
  
      /** {@inheritDoc} */
      @Override
      protected void orderItems() {
          int idx = 0;
  
          for (StringIdItem s : strings.values()) {
              s.setIndex(idx);
              idx++;
          }
      }
  }
  