1/*
2 * Copyright (C) 2013 DroidDriver committers
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.android.droiddriver.util;
18
19/**
20 * Static helper methods for manipulating strings.
21 */
22public class Strings {
23  public static String charSequenceToString(CharSequence input) {
24    return input == null ? null : input.toString();
25  }
26
27  public static ToStringHelper toStringHelper(Object self) {
28    return new ToStringHelper(self.getClass().getSimpleName());
29  }
30
31  public static final class ToStringHelper {
32    private final StringBuilder builder;
33    private boolean needsSeparator = false;
34
35    /**
36     * Use {@link #toStringHelper(Object)} to create an instance.
37     */
38    private ToStringHelper(String className) {
39      this.builder = new StringBuilder(32).append(className).append('{');
40    }
41
42    public ToStringHelper addValue(Object value) {
43      maybeAppendSeparator().append(value);
44      return this;
45    }
46
47    public ToStringHelper add(String name, Object value) {
48      maybeAppendSeparator().append(name).append('=').append(value);
49      return this;
50    }
51
52    @Override
53    public String toString() {
54      return builder.append('}').toString();
55    }
56
57    private StringBuilder maybeAppendSeparator() {
58      if (needsSeparator) {
59        return builder.append(", ");
60      } else {
61        needsSeparator = true;
62        return builder;
63      }
64    }
65  }
66}
67