1/*
2 * Copyright (C) 2011 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.utility;
18
19import com.android.emailcommon.internet.MimeHeader;
20import com.android.emailcommon.internet.MimeUtility;
21import com.android.emailcommon.mail.MessagingException;
22import com.android.emailcommon.mail.Part;
23
24import android.text.TextUtils;
25
26import java.util.ArrayList;
27
28public class ConversionUtilities {
29    /**
30     * Helper function to append text to a StringBuffer, creating it if necessary.
31     * Optimization:  The majority of the time we are *not* appending - we should have a path
32     * that deals with single strings.
33     */
34    private static StringBuffer appendTextPart(StringBuffer sb, String newText) {
35        if (newText == null) {
36            return sb;
37        }
38        else if (sb == null) {
39            sb = new StringBuffer(newText);
40        } else {
41            if (sb.length() > 0) {
42                sb.append('\n');
43            }
44            sb.append(newText);
45        }
46        return sb;
47    }
48
49    /**
50     * Plain-Old-Data class to return parsed body data from
51     * {@link ConversionUtilities#parseBodyFields}
52     */
53    public static class BodyFieldData {
54        public String textContent;
55        public String htmlContent;
56        public String snippet;
57        public boolean isQuotedReply;
58        public boolean isQuotedForward;
59    }
60
61    /**
62     * Parse body text (plain and/or HTML) from MimeMessage to {@link BodyFieldData}.
63     */
64    public static BodyFieldData parseBodyFields(ArrayList<Part> viewables)
65    throws MessagingException {
66        final BodyFieldData data = new BodyFieldData();
67        StringBuffer sbHtml = null;
68        StringBuffer sbText = null;
69
70        for (Part viewable : viewables) {
71            String text = MimeUtility.getTextFromPart(viewable);
72            // Deploy text as marked by the various tags
73            boolean isHtml = "text/html".equalsIgnoreCase(viewable.getMimeType());
74
75            // Most of the time, just process regular body parts
76            if (isHtml) {
77                sbHtml = appendTextPart(sbHtml, text);
78            } else {
79                sbText = appendTextPart(sbText, text);
80            }
81        }
82
83        // write the combined data to the body part
84        if (!TextUtils.isEmpty(sbText)) {
85            String text = sbText.toString();
86            data.textContent = text;
87            data.snippet = TextUtilities.makeSnippetFromPlainText(text);
88        }
89        if (!TextUtils.isEmpty(sbHtml)) {
90            String text = sbHtml.toString();
91            data.htmlContent = text;
92            if (data.snippet == null) {
93                data.snippet = TextUtilities.makeSnippetFromHtmlText(text);
94            }
95        }
96        return data;
97    }
98}
99