1 files changed, 100 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/profiler/statistics/PhaseSummaryStatistics.java b/src/main/java/com/google/devtools/build/lib/profiler/statistics/PhaseSummaryStatistics.java
new file mode 100644
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--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/profiler/statistics/PhaseSummaryStatistics.java
@@ -0,0 +1,100 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// 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.google.devtools.build.lib.profiler.statistics;
+
+import com.google.devtools.build.lib.profiler.ProfileInfo;
+import com.google.devtools.build.lib.profiler.ProfilePhase;
+
+import java.util.EnumMap;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/**
+ * Extracts and keeps summary statistics from all {@link ProfilePhase}s for formatting to various
+ * outputs.
+ */
+public final class PhaseSummaryStatistics implements Iterable<ProfilePhase> {
+
+  private final long totalDurationNanos;
+  private final EnumMap<ProfilePhase, Long> durations;
+
+  public PhaseSummaryStatistics(ProfileInfo info) {
+    durations = new EnumMap<>(ProfilePhase.class);
+    long totalDuration = 0;
+    for (ProfilePhase phase : ProfilePhase.values()) {
+      ProfileInfo.Task phaseTask = info.getPhaseTask(phase);
+      if (phaseTask != null) {
+        long phaseDuration = info.getPhaseDuration(phaseTask);
+        totalDuration += phaseDuration;
+        durations.put(phase, phaseDuration);
+      }
+    }
+    totalDurationNanos = totalDuration;
+  }
+
+  /**
+   * @return whether the given {@link ProfilePhase} was executed
+   */
+  public boolean contains(ProfilePhase phase) {
+    return durations.containsKey(phase);
+  }
+
+  /**
+   * @return the execution duration of a given {@link ProfilePhase}
+   * @throws NoSuchElementException if the given {@link ProfilePhase} was not executed
+   */
+  public long getDurationNanos(ProfilePhase phase) {
+    checkContains(phase);
+    return durations.get(phase);
+  }
+
+  /**
+   * @return The duration of the phase relative to the sum of all phase durations
+   * @throws NoSuchElementException if the given {@link ProfilePhase} was not executed
+   */
+  public double getRelativeDuration(ProfilePhase phase) {
+    checkContains(phase);
+    return (double) getDurationNanos(phase) / totalDurationNanos;
+  }
+
+  /**
+   * Converts {@link #getRelativeDuration(ProfilePhase)} to a percentage string
+   * @return formatted percentage string ("%.2f%%") or "N/A" when totalNanos is 0.
+   * @throws NoSuchElementException if the given {@link ProfilePhase} was not executed
+   */
+  public String getPrettyPercentage(ProfilePhase phase) {
+    checkContains(phase);
+    if (totalDurationNanos == 0) {
+      // Return "not available" string if total is 0 and result is undefined.
+      return "N/A";
+    }
+    return String.format("%.2f%%", getRelativeDuration(phase) * 100);
+  }
+
+  public long getTotalDuration() {
+    return totalDurationNanos;
+  }
+
+  @Override
+  public Iterator<ProfilePhase> iterator() {
+    return durations.keySet().iterator();
+  }
+
+  private void checkContains(ProfilePhase phase) {
+    if (!contains(phase)) {
+      throw new NoSuchElementException("Phase " + phase + " was not executed");
+    }
+  }
+}
+