content: /*
   * Copyright (C) 2015 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.android.ahat;
  
  import com.android.tools.perflib.heap.ClassObj;
  import com.android.tools.perflib.heap.Instance;
  import java.net.URI;
  
  /**
   * Class to render an hprof value to a DocString.
   */
  class Value {
  
    // For string literals, we limit the number of characters we show to
    // kMaxChars in case the string is really long.
    private static int kMaxChars = 200;
  
    /**
     * Create a DocString representing a summary of the given instance.
     */
    private static DocString renderInstance(AhatSnapshot snapshot, Instance inst) {
      DocString formatted = new DocString();
      if (inst == null) {
        formatted.append("(null)");
        return formatted;
      }
  
      // Annotate roots as roots.
      if (snapshot.isRoot(inst)) {
        formatted.append("(root) ");
      }
  
  
      // Annotate classes as classes.
      DocString link = new DocString();
      if (inst instanceof ClassObj) {
        link.append("class ");
      }
  
      link.append(inst.toString());
  
      URI objTarget = DocString.formattedUri("object?id=%d", inst.getId());
      formatted.appendLink(objTarget, link);
  
      // Annotate Strings with their values.
      String stringValue = InstanceUtils.asString(inst, kMaxChars);
      if (stringValue != null) {
        formatted.appendFormat(" \"%s", stringValue);
        formatted.append(kMaxChars == stringValue.length() ? "..." : "\"");
      }
  
      // Annotate Reference with its referent
      Instance referent = InstanceUtils.getReferent(inst);
      if (referent != null) {
        formatted.append(" for ");
  
        // It should not be possible for a referent to refer back to the
        // reference object, even indirectly, so there shouldn't be any issues
        // with infinite recursion here.
        formatted.append(renderInstance(snapshot, referent));
      }
  
      // Annotate DexCache with its location.
      String dexCacheLocation = InstanceUtils.getDexCacheLocation(inst, kMaxChars);
      if (dexCacheLocation != null) {
        formatted.appendFormat(" for %s", dexCacheLocation);
        if (kMaxChars == dexCacheLocation.length()) {
          formatted.append("...");
        }
      }
  
  
      // Annotate bitmaps with a thumbnail.
      Instance bitmap = InstanceUtils.getAssociatedBitmapInstance(inst);
      String thumbnail = "";
      if (bitmap != null) {
        URI uri = DocString.formattedUri("bitmap?id=%d", bitmap.getId());
        formatted.appendThumbnail(uri, "bitmap image");
      }
      return formatted;
    }
  
    /**
     * Create a DocString summarizing the given value.
     */
    public static DocString render(AhatSnapshot snapshot, Object val) {
      if (val instanceof Instance) {
        return renderInstance(snapshot, (Instance)val);
      } else {
        return DocString.format("%s", val);
      }
    }
  }
  