Base64Body.java revision c68d34d924b32dd40644637be5817d0e64ac73be 
1/*
2 * Copyright (C) 2014 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
17package com.android.emailcommon.mail;
18
19import android.util.Base64;
20import android.util.Base64OutputStream;
21
22import org.apache.commons.io.IOUtils;
23
24import java.io.IOException;
25import java.io.InputStream;
26import java.io.OutputStream;
27
28public class Base64Body implements Body {
29    private final InputStream mSource;
30    // Because we consume the input stream, we can only write out once
31    private boolean mAlreadyWritten;
32
33    public Base64Body(InputStream source) {
34        mSource = source;
35    }
36
37    @Override
38    public InputStream getInputStream() throws MessagingException {
39        return mSource;
40    }
41
42    /**
43     * This method consumes the input stream, so can only be called once
44     * @param out Stream to write to
45     * @throws IllegalStateException If called more than once
46     * @throws IOException
47     * @throws MessagingException
48     */
49    @Override
50    public void writeTo(OutputStream out)
51            throws IllegalStateException, IOException, MessagingException {
52        if (mAlreadyWritten) {
53            throw new IllegalStateException("Base64Body can only be written once");
54        }
55        mAlreadyWritten = true;
56        try {
57            final Base64OutputStream b64out = new Base64OutputStream(out, Base64.DEFAULT);
58            IOUtils.copyLarge(mSource, b64out);
59        } finally {
60            mSource.close();
61        }
62    }
63}
64