1 /*
2  * Copyright (C) 2008 The Android Open Source Project
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 
17 package util.build;
18 
19 import java.io.File;
20 import java.io.FileInputStream;
21 import java.io.FileOutputStream;
22 import java.io.IOException;
23 import java.nio.channels.FileChannel;
24 import java.util.HashSet;
25 import java.util.Set;
26 
27 abstract class BuildStep implements Comparable<BuildStep> {
28 
29     BuildFile inputFile;
30     BuildFile outputFile;
31 
32     static class BuildFile {
33         final File folder;
34         final File fileName;
35 
BuildFile(String folder, String fileName)36         BuildFile(String folder, String fileName) {
37             this.folder = new File(folder);
38             this.fileName = new File(this.folder, fileName);
39         }
BuildFile(File file)40         BuildFile(File file) {
41           this.folder = file.getParentFile();
42           this.fileName = file;
43       }
44 
getPath()45         String getPath() {
46             return fileName.getAbsolutePath();
47         }
48 
49         @Override
hashCode()50         public int hashCode() {
51             return fileName.hashCode();
52         }
53 
54         @Override
equals(Object obj)55         public boolean equals(Object obj) {
56             if (obj == null) return false;
57             if (this == obj) return true;
58             if (getClass() == obj.getClass()) {
59                 BuildFile other = (BuildFile) obj;
60                 return fileName.equals(other.fileName);
61             }
62             return false;
63         }
64     }
65 
BuildStep(BuildFile inputFile, BuildFile outputFile)66     BuildStep(BuildFile inputFile, BuildFile outputFile) {
67         if (inputFile == null) {
68             throw new NullPointerException("inputFile is null");
69         }
70         if (outputFile == null) {
71             throw new NullPointerException("outputFile is null");
72         }
73         this.inputFile = inputFile;
74         this.outputFile = outputFile;
75     }
76 
BuildStep(File output)77     BuildStep(File output) {
78         this.outputFile = new BuildFile(output);
79     }
80 
81     private Set<BuildStep> children;
82 
build()83     boolean build() {
84         if (children != null) {
85             for (BuildStep child : children) {
86                 if (!child.build()) {
87                     return false;
88                 }
89             }
90         }
91         return true;
92     }
93 
94     @Override
equals(Object obj)95     public boolean equals(Object obj) {
96         if (obj == null) return false;
97         if (obj == this) return true;
98         return this.getClass() == obj.getClass();
99     }
100 
101     @Override
hashCode()102     public abstract int hashCode();
103 
addChild(BuildStep child)104     public void addChild(BuildStep child) {
105         if (children == null) {
106             children = new HashSet<BuildStep>();
107         }
108         children.add(child);
109     }
110 
copyFile(File in, File out)111     public static void copyFile(File in, File out) throws IOException {
112         FileChannel inChannel = new FileInputStream(in).getChannel();
113         FileChannel outChannel = new FileOutputStream(out).getChannel();
114         try {
115             inChannel.transferTo(0, inChannel.size(), outChannel);
116         } catch (IOException e) {
117             throw e;
118         } finally {
119             if (inChannel != null) inChannel.close();
120             if (outChannel != null) outChannel.close();
121         }
122     }
123 
compareTo(BuildStep o)124     public int compareTo(BuildStep o) {
125         return (outputFile == o.outputFile ? 0 : outputFile.getPath().compareTo(
126                         o.outputFile.getPath()));
127     }
128 }
129