1/*
2 * Copyright (C) 2014 Google, Inc.
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 */
16package dagger.internal.codegen.writer;
17
18import com.google.common.base.Function;
19import com.google.common.collect.FluentIterable;
20import com.google.common.collect.Lists;
21import java.io.IOException;
22import java.util.List;
23import java.util.Set;
24
25public final class BlockWriter implements Writable, HasClassReferences {
26  private final List<Snippet> snippets;
27
28  BlockWriter() {
29    this.snippets = Lists.newArrayList();
30  }
31
32  public BlockWriter addSnippet(String snippet, Object... args) {
33    snippets.add(Snippet.format(snippet, args));
34    return this;
35  }
36
37  public BlockWriter addSnippet(Snippet snippet) {
38    snippets.add(snippet);
39    return this;
40  }
41
42  boolean isEmpty() {
43    return snippets.isEmpty();
44  }
45
46  @Override
47  public Appendable write(Appendable appendable, Context context) throws IOException {
48    for (Snippet snippet : snippets) {
49      appendable.append('\n');
50      snippet.write(appendable, context);
51    }
52    return appendable.append('\n');
53  }
54
55  @Override
56  public Set<ClassName> referencedClasses() {
57    return FluentIterable.from(snippets)
58        .transformAndConcat(new Function<HasClassReferences, Set<ClassName>>() {
59          @Override
60          public Set<ClassName> apply(HasClassReferences input) {
61            return input.referencedClasses();
62          }
63        })
64        .toSet();
65  }
66}
67