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      1 /*
      2  * Copyright (C) 2017 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 package com.android.server.usb.descriptors.report;
     17 
     18 import com.android.server.usb.descriptors.UsbDescriptorParser;
     19 
     20 /**
     21  * @hide
     22  * A concrete implementation of ReportCanvas class which generates "Plain Text" output.
     23  */
     24 public final class TextReportCanvas extends ReportCanvas {
     25     private static final String TAG = "TextReportCanvas";
     26 
     27     private final StringBuilder mStringBuilder;
     28     private int mListIndent;
     29     private static final int LIST_INDENT_AMNT = 2;
     30 
     31     /**
     32      * Constructor. Connects plain-text output to the provided StringBuilder.
     33      * @param connection    The USB connection object used to retrieve strings
     34      * from the USB device.
     35      * @param stringBuilder Generated output gets written into this object.
     36      */
     37     public TextReportCanvas(UsbDescriptorParser parser, StringBuilder stringBuilder) {
     38         super(parser);
     39 
     40         mStringBuilder = stringBuilder;
     41     }
     42 
     43     private void writeListIndent() {
     44         for (int space = 0; space < mListIndent; space++) {
     45             mStringBuilder.append(" ");
     46         }
     47     }
     48 
     49     @Override
     50     public void write(String text) {
     51         mStringBuilder.append(text);
     52     }
     53 
     54     @Override
     55     public void openHeader(int level) {
     56         writeListIndent();
     57         mStringBuilder.append("[");
     58     }
     59 
     60     @Override
     61     public void closeHeader(int level) {
     62         mStringBuilder.append("]\n");
     63     }
     64 
     65     @Override
     66     public void openParagraph(boolean emphasis) {
     67         writeListIndent();
     68     }
     69 
     70     @Override
     71     public void closeParagraph() {
     72         mStringBuilder.append("\n");
     73     }
     74 
     75     @Override
     76     public void writeParagraph(String text, boolean inRed) {
     77         openParagraph(inRed);
     78         if (inRed) {
     79             mStringBuilder.append("*" + text + "*");
     80         } else {
     81             mStringBuilder.append(text);
     82         }
     83         closeParagraph();
     84     }
     85 
     86     @Override
     87     public void openList() {
     88         mListIndent += LIST_INDENT_AMNT;
     89     }
     90 
     91     @Override
     92     public void closeList() {
     93         mListIndent -= LIST_INDENT_AMNT;
     94     }
     95 
     96     @Override
     97     public void openListItem() {
     98         writeListIndent();
     99         mStringBuilder.append("- ");
    100     }
    101 
    102     @Override
    103     public void closeListItem() {
    104         mStringBuilder.append("\n");
    105     }
    106 }
    107