1 files changed, 143 insertions, 0 deletions
diff --git a/tools/ahat/src/Summarizer.java b/tools/ahat/src/Summarizer.java
new file mode 100644
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+++ b/tools/ahat/src/Summarizer.java
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+/*
+ * 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.ahat.heapdump.AhatInstance;
+import com.android.ahat.heapdump.Site;
+import com.android.ahat.heapdump.Value;
+import java.net.URI;
+
+/**
+ * Class for generating a DocString summary of an instance or value.
+ */
+class Summarizer {
+
+  // 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;
+
+  /**
+   * Creates a DocString representing a summary of the given instance.
+   */
+  public static DocString summarize(AhatInstance inst) {
+    DocString formatted = new DocString();
+    if (inst == null) {
+      formatted.append("null");
+      return formatted;
+    }
+
+    // Annotate new objects as new.
+    if (inst.getBaseline().isPlaceHolder()) {
+      formatted.append(DocString.added("new "));
+    }
+
+    // Annotate deleted objects as deleted.
+    if (inst.isPlaceHolder()) {
+      formatted.append(DocString.removed("del "));
+    }
+
+    // Annotate unreachable objects as such.
+    if (!inst.isReachable()) {
+      formatted.append("unreachable ");
+    }
+
+    // Annotate roots as roots.
+    if (inst.isRoot()) {
+      formatted.append("root ");
+    }
+
+    // Annotate classes as classes.
+    DocString linkText = new DocString();
+    if (inst.isClassObj()) {
+      linkText.append("class ");
+    }
+
+    linkText.append(inst.toString());
+
+    if (inst.isPlaceHolder()) {
+      // Don't make links to placeholder objects.
+      formatted.append(linkText);
+    } else {
+      URI objTarget = DocString.formattedUri("object?id=%d", inst.getId());
+      formatted.appendLink(objTarget, linkText);
+    }
+
+    // Annotate Strings with their values.
+    String stringValue = inst.asString(kMaxChars);
+    if (stringValue != null) {
+      formatted.appendFormat(" \"%s", stringValue);
+      formatted.append(kMaxChars == stringValue.length() ? "..." : "\"");
+    }
+
+    // Annotate Reference with its referent
+    AhatInstance referent = inst.getReferent();
+    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(summarize(referent));
+    }
+
+    // Annotate DexCache with its location.
+    String dexCacheLocation = inst.getDexCacheLocation(kMaxChars);
+    if (dexCacheLocation != null) {
+      formatted.appendFormat(" for %s", dexCacheLocation);
+      if (kMaxChars == dexCacheLocation.length()) {
+        formatted.append("...");
+      }
+    }
+
+    // Annotate bitmaps with a thumbnail.
+    AhatInstance bitmap = inst.getAssociatedBitmapInstance();
+    String thumbnail = "";
+    if (bitmap != null) {
+      URI uri = DocString.formattedUri("bitmap?id=%d", bitmap.getId());
+      formatted.appendThumbnail(uri, "bitmap image");
+    }
+    return formatted;
+  }
+
+  /**
+   * Creates a DocString summarizing the given value.
+   */
+  public static DocString summarize(Value value) {
+    if (value == null) {
+      return DocString.text("null");
+    }
+    if (value.isAhatInstance()) {
+      return summarize(value.asAhatInstance());
+    }
+    return DocString.text(value.toString());
+  }
+
+  /**
+   * Creates a DocString summarizing the given site.
+   */
+  public static DocString summarize(Site site) {
+    DocString text = DocString.text(site.getMethodName());
+    text.append(site.getSignature());
+    text.append(" - ");
+    text.append(site.getFilename());
+    if (site.getLineNumber() > 0) {
+      text.append(":").append(Integer.toString(site.getLineNumber()));
+    }
+    URI uri = DocString.formattedUri("site?id=%d&depth=%d", site.getId(), site.getDepth());
+    return DocString.link(uri, text);
+  }
+}