Home | History | Annotate | Download | only in internet 
      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.emailcommon.internet;
     18 
     19 import com.android.emailcommon.TempDirectory;
     20 import com.android.emailcommon.mail.Body;
     21 import com.android.emailcommon.mail.MessagingException;
     22 
     23 import org.apache.commons.io.IOUtils;
     24 
     25 import android.util.Base64;
     26 import android.util.Base64OutputStream;
     27 
     28 import java.io.File;
     29 import java.io.FileInputStream;
     30 import java.io.FileOutputStream;
     31 import java.io.FilterInputStream;
     32 import java.io.IOException;
     33 import java.io.InputStream;
     34 import java.io.OutputStream;
     35 
     36 /**
     37  * A Body that is backed by a temp file. The Body exposes a getOutputStream method that allows
     38  * the user to write to the temp file. After the write the body is available via getInputStream
     39  * and writeTo one time. After writeTo is called, or the InputStream returned from
     40  * getInputStream is closed the file is deleted and the Body should be considered disposed of.
     41  */
     42 public class BinaryTempFileBody implements Body {
     43     private File mFile;
     44 
     45     /**
     46      * An alternate way to put data into a BinaryTempFileBody is to simply supply an already-
     47      * created file.  Note that this file will be deleted after it is read.
     48      * @param filePath The file containing the data to be stored on disk temporarily
     49      */
     50     public void setFile(String filePath) {
     51         mFile = new File(filePath);
     52     }
     53 
     54     public OutputStream getOutputStream() throws IOException {
     55         mFile = File.createTempFile("body", null, TempDirectory.getTempDirectory());
     56         mFile.deleteOnExit();
     57         return new FileOutputStream(mFile);
     58     }
     59 
     60     @Override
     61     public InputStream getInputStream() throws MessagingException {
     62         try {
     63             return new BinaryTempFileBodyInputStream(new FileInputStream(mFile));
     64         }
     65         catch (IOException ioe) {
     66             throw new MessagingException("Unable to open body", ioe);
     67         }
     68     }
     69 
     70     @Override
     71     public void writeTo(OutputStream out) throws IOException, MessagingException {
     72         InputStream in = getInputStream();
     73         Base64OutputStream base64Out = new Base64OutputStream(
     74             out, Base64.CRLF | Base64.NO_CLOSE);
     75         IOUtils.copy(in, base64Out);
     76         base64Out.close();
     77         mFile.delete();
     78     }
     79 
     80     class BinaryTempFileBodyInputStream extends FilterInputStream {
     81         public BinaryTempFileBodyInputStream(InputStream in) {
     82             super(in);
     83         }
     84 
     85         @Override
     86         public void close() throws IOException {
     87             super.close();
     88             mFile.delete();
     89         }
     90     }
     91 }
     92