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      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 com.android.io;
     18 
     19 
     20 import java.io.File;
     21 import java.io.FileInputStream;
     22 import java.io.FileNotFoundException;
     23 import java.io.FileOutputStream;
     24 import java.io.IOException;
     25 import java.io.InputStream;
     26 import java.io.OutputStream;
     27 import java.net.URI;
     28 
     29 /**
     30  * An implementation of {@link IAbstractFile} extending {@link File}.
     31  */
     32 public class FileWrapper extends File implements IAbstractFile {
     33     private static final long serialVersionUID = 1L;
     34 
     35     /**
     36      * Creates a new File instance matching a given {@link File} object.
     37      * @param file the file to match
     38      */
     39     public FileWrapper(File file) {
     40         super(file.getAbsolutePath());
     41     }
     42 
     43     /**
     44      * Creates a new File instance from a parent abstract pathname and a child pathname string.
     45      * @param parent the parent pathname
     46      * @param child the child name
     47      *
     48      * @see File#File(File, String)
     49      */
     50     public FileWrapper(File parent, String child) {
     51         super(parent, child);
     52     }
     53 
     54     /**
     55      * Creates a new File instance by converting the given pathname string into an abstract
     56      * pathname.
     57      * @param osPathname the OS pathname
     58      *
     59      * @see File#File(String)
     60      */
     61     public FileWrapper(String osPathname) {
     62         super(osPathname);
     63     }
     64 
     65     /**
     66      * Creates a new File instance from a parent abstract pathname and a child pathname string.
     67      * @param parent the parent pathname
     68      * @param child the child name
     69      *
     70      * @see File#File(String, String)
     71      */
     72     public FileWrapper(String parent, String child) {
     73         super(parent, child);
     74     }
     75 
     76     /**
     77      * Creates a new File instance by converting the given <code>file:</code> URI into an
     78      * abstract pathname.
     79      * @param uri An absolute, hierarchical URI with a scheme equal to "file", a non-empty path
     80      * component, and undefined authority, query, and fragment components
     81      *
     82      * @see File#File(URI)
     83      */
     84     public FileWrapper(URI uri) {
     85         super(uri);
     86     }
     87 
     88     @Override
     89     public InputStream getContents() throws StreamException {
     90         try {
     91             return new FileInputStream(this);
     92         } catch (FileNotFoundException e) {
     93             throw new StreamException(e, this, StreamException.Error.FILENOTFOUND);
     94         }
     95     }
     96 
     97     @Override
     98     public void setContents(InputStream source) throws StreamException {
     99         FileOutputStream fos = null;
    100         try {
    101             fos = new FileOutputStream(this);
    102 
    103             byte[] buffer = new byte[1024];
    104             int count = 0;
    105             while ((count = source.read(buffer)) != -1) {
    106                 fos.write(buffer, 0, count);
    107             }
    108         } catch (IOException e) {
    109             throw new StreamException(e, this);
    110         } finally {
    111             if (fos != null) {
    112                 try {
    113                     fos.close();
    114                 } catch (IOException e) {
    115                     throw new StreamException(e, this);
    116                 }
    117             }
    118         }
    119     }
    120 
    121     @Override
    122     public OutputStream getOutputStream() throws StreamException {
    123         try {
    124             return new FileOutputStream(this);
    125         } catch (FileNotFoundException e) {
    126             throw new StreamException(e, this);
    127         }
    128     }
    129 
    130     @Override
    131     public PreferredWriteMode getPreferredWriteMode() {
    132         return PreferredWriteMode.OUTPUTSTREAM;
    133     }
    134 
    135     @Override
    136     public String getOsLocation() {
    137         return getAbsolutePath();
    138     }
    139 
    140     @Override
    141     public boolean exists() {
    142         return isFile();
    143     }
    144 
    145     @Override
    146     public long getModificationStamp() {
    147         return lastModified();
    148     }
    149 
    150     @Override
    151     public IAbstractFolder getParentFolder() {
    152         String p = this.getParent();
    153         if (p == null) {
    154             return null;
    155         }
    156         return new FolderWrapper(p);
    157     }
    158 }
    159