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  */
16 package dagger.internal.codegen.writer;
17 
18 import com.google.common.base.Function;
19 import com.google.common.collect.FluentIterable;
20 import com.google.common.collect.Lists;
21 import java.io.IOException;
22 import java.util.List;
23 import java.util.Set;
24 
25 public final class BlockWriter implements Writable, HasClassReferences {
26   private final List<Snippet> snippets;
27 
BlockWriter()28   BlockWriter() {
29     this.snippets = Lists.newArrayList();
30   }
31 
addSnippet(String snippet, Object... args)32   public BlockWriter addSnippet(String snippet, Object... args) {
33     snippets.add(Snippet.format(snippet, args));
34     return this;
35   }
36 
addSnippet(Snippet snippet)37   public BlockWriter addSnippet(Snippet snippet) {
38     snippets.add(snippet);
39     return this;
40   }
41 
isEmpty()42   boolean isEmpty() {
43     return snippets.isEmpty();
44   }
45 
46   @Override
write(Appendable appendable, Context context)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
referencedClasses()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