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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.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();
}
}
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