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         }
40 
getPath()41         String getPath() {
42             return fileName.getAbsolutePath();
43         }
44 
45         @Override
hashCode()46         public int hashCode() {
47             return fileName.hashCode();
48         }
49 
50         @Override
equals(Object obj)51         public boolean equals(Object obj) {
52             if (obj == null) return false;
53             if (this == obj) return true;
54             if (getClass() == obj.getClass()) {
55                 BuildFile other = (BuildFile) obj;
56                 return fileName.equals(other.fileName);
57             }
58             return false;
59         }
60     }
61 
BuildStep(BuildFile inputFile, BuildFile outputFile)62     BuildStep(BuildFile inputFile, BuildFile outputFile) {
63         if (inputFile == null) {
64             throw new NullPointerException("inputFile is null");
65         }
66         if (outputFile == null) {
67             throw new NullPointerException("outputFile is null");
68         }
69         this.inputFile = inputFile;
70         this.outputFile = outputFile;
71     }
72 
BuildStep()73     BuildStep() {
74     }
75 
76     private Set<BuildStep> children;
77 
build()78     boolean build() {
79         if (children != null) {
80             for (BuildStep child : children) {
81                 if (!child.build()) {
82                     return false;
83                 }
84             }
85         }
86         return true;
87     }
88 
89     @Override
equals(Object obj)90     public boolean equals(Object obj) {
91         if (obj == null) return false;
92         if (obj == this) return true;
93         return this.getClass() == obj.getClass();
94     }
95 
96     @Override
hashCode()97     public abstract int hashCode();
98 
addChild(BuildStep child)99     public void addChild(BuildStep child) {
100         if (children == null) {
101             children = new HashSet<BuildStep>();
102         }
103         children.add(child);
104     }
105 
copyFile(File in, File out)106     public static void copyFile(File in, File out) throws IOException {
107         FileChannel inChannel = new FileInputStream(in).getChannel();
108         FileChannel outChannel = new FileOutputStream(out).getChannel();
109         try {
110             inChannel.transferTo(0, inChannel.size(), outChannel);
111         } catch (IOException e) {
112             throw e;
113         } finally {
114             if (inChannel != null) inChannel.close();
115             if (outChannel != null) outChannel.close();
116         }
117     }
118 
compareTo(BuildStep o)119     public int compareTo(BuildStep o) {
120         return (inputFile == o.inputFile ? 0 : (inputFile != null
121                 ? (o.inputFile != null ? inputFile.getPath().compareTo(
122                         o.inputFile.getPath()) : 1) : -1));
123     }
124 }
125