1 files changed, 143 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/git/meta/TabFile.java b/java/com/google/gerrit/server/git/meta/TabFile.java
new file mode 100644
index 0000000000..4c0378a0ec
--- /dev/null
+++ b/java/com/google/gerrit/server/git/meta/TabFile.java
@@ -0,0 +1,143 @@
+// 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.google.gerrit.server.git.meta;
+
+import static com.google.common.collect.ImmutableList.toImmutableList;
+
+import com.google.common.collect.ImmutableList;
+import com.google.gerrit.server.git.ValidationError;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class TabFile {
+  @FunctionalInterface
+  public interface Parser {
+    String parse(String str);
+  }
+
+  public static Parser TRIM = String::trim;
+
+  protected static class Row {
+    public String left;
+    public String right;
+
+    public Row(String left, String right) {
+      this.left = left;
+      this.right = right;
+    }
+  }
+
+  protected static List<Row> parse(
+      String text, String filename, Parser left, Parser right, ValidationError.Sink errors)
+      throws IOException {
+    List<Row> rows = new ArrayList<>();
+    BufferedReader br = new BufferedReader(new StringReader(text));
+    String s;
+    for (int lineNumber = 1; (s = br.readLine()) != null; lineNumber++) {
+      if (s.isEmpty() || s.startsWith("#")) {
+        continue;
+      }
+
+      int tab = s.indexOf('\t');
+      if (tab < 0) {
+        errors.error(new ValidationError(filename, lineNumber, "missing tab delimiter"));
+        continue;
+      }
+
+      Row row = new Row(s.substring(0, tab), s.substring(tab + 1));
+      rows.add(row);
+
+      if (left != null) {
+        row.left = left.parse(row.left);
+      }
+      if (right != null) {
+        row.right = right.parse(row.right);
+      }
+    }
+    return rows;
+  }
+
+  protected static Map<String, String> toMap(List<Row> rows) {
+    Map<String, String> map = new HashMap<>(rows.size());
+    for (Row row : rows) {
+      map.put(row.left, row.right);
+    }
+    return map;
+  }
+
+  protected static String asText(String left, String right, Map<String, String> entries) {
+    if (entries.isEmpty()) {
+      return null;
+    }
+
+    List<Row> rows = new ArrayList<>(entries.size());
+    for (String key : sort(entries.keySet())) {
+      rows.add(new Row(key, entries.get(key)));
+    }
+    return asText(left, right, rows);
+  }
+
+  protected static String asText(String left, String right, List<Row> rows) {
+    if (rows.isEmpty()) {
+      return null;
+    }
+
+    left = "# " + left;
+    int leftLen = left.length();
+    for (Row row : rows) {
+      leftLen = Math.max(leftLen, row.left.length());
+    }
+
+    StringBuilder buf = new StringBuilder();
+    buf.append(pad(leftLen, left));
+    buf.append('\t');
+    buf.append(right);
+    buf.append('\n');
+
+    buf.append('#');
+    buf.append('\n');
+
+    for (Row row : rows) {
+      buf.append(pad(leftLen, row.left));
+      buf.append('\t');
+      buf.append(row.right);
+      buf.append('\n');
+    }
+    return buf.toString();
+  }
+
+  protected static <T extends Comparable<? super T>> ImmutableList<T> sort(Collection<T> m) {
+    return m.stream().sorted().collect(toImmutableList());
+  }
+
+  protected static String pad(int len, String src) {
+    if (len <= src.length()) {
+      return src;
+    }
+
+    StringBuilder r = new StringBuilder(len);
+    r.append(src);
+    while (r.length() < len) {
+      r.append(' ');
+    }
+    return r.toString();
+  }
+}