src/tools/org/h2/dev/util/ThreadDumpInliner.java

h2/src/tools/org/h2/dev/util/ThreadDumpInliner.java

+/*
+ * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
+package org.h2.dev.util;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.LineNumberReader;
+import java.io.PrintWriter;
+
+/**
+ * Convert a list of thread dumps into one line per thread.
+ */
+public class ThreadDumpInliner {
+
+    /**
+     * Usage: java ThreadDumpInliner threadDump.txt
+     *
+     * @param a the file name
+     */
+    public static void main(String... a) throws Exception {
+        String fileName = a[0];
+        LineNumberReader in = new LineNumberReader(
+                new BufferedReader(new FileReader(fileName)));
+        PrintWriter writer = new PrintWriter(new BufferedWriter(
+                new FileWriter(fileName + ".lines.txt")));
+
+        StringBuilder buff = new StringBuilder();
+        for (String s; (s = in.readLine()) != null;) {
+            if (s.trim().length() == 0) {
+                continue;
+            }
+            if (s.startsWith(" ") || s.startsWith("\t")) {
+                buff.append('\t').append(s.trim());
+            } else {
+                printNonEmpty(writer, buff.toString());
+                buff = new StringBuilder(s);
+            }
+        }
+        printNonEmpty(writer, buff.toString());
+        in.close();
+        writer.close();
+    }
+
+    private static void printNonEmpty(PrintWriter writer, String s) {
+        s = s.trim();
+        if (!s.isEmpty()) {
+            writer.println(s);
+        }
+    }
+}