[26186] | 1 | /**
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| 2 | * Adding support for Images in Terrier
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| 3 | * @author: John Thompson, jmt12, #9826509
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| 4 | *
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| 5 | * The contents of this file are subject to the Mozilla Public License
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| 6 | * Version 1.1 (the "License"); you may not use this file except in
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| 7 | * compliance with the License. You may obtain a copy of the License at
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| 8 | * http://www.mozilla.org/MPL/
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| 9 | *
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| 10 | * Software distributed under the License is distributed on an "AS IS"
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| 11 | * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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| 12 | * the License for the specific language governing rights and limitations
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| 13 | * under the License.
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| 14 | *
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| 15 | * Copyright (c) 2011 The University of Waikato. All Rights Reserved.
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| 16 | */
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| 17 | package org.terrier.indexing;
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| 18 |
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| 19 | import java.io.InputStream;
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| 20 | import java.io.StringReader;
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| 21 | import java.io.Reader;
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| 22 | import java.nio.file.Files;
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| 23 | import java.nio.file.Path;
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| 24 | import java.nio.file.Paths;
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| 25 | import java.util.Collections;
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| 26 | import java.util.Arrays;
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| 27 | import java.util.Map;
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| 28 | import java.util.Set;
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| 29 |
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| 30 | import org.apache.log4j.Logger;
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[26190] | 31 | import org.terrier.indexing.StreamGobbler;
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[26186] | 32 | import org.terrier.indexing.tokenisation.TokenStream;
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| 33 | import org.terrier.indexing.tokenisation.Tokeniser;
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| 34 | import org.terrier.utility.ApplicationSetup;
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| 35 |
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| 36 | public class ImageDocument
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| 37 | implements Document
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| 38 | {
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| 39 | /** A reference to the logger for messaging */
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| 40 | protected static final Logger logger = Logger.getLogger(FileDocument.class);
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| 41 | /** The map of properties (fields) for this document. */
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| 42 | protected Map<String,String> properties;
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| 43 | /** A reader built from a dummy text string. */
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| 44 | protected Reader reader;
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| 45 | /** A token stream produced by the configured tokeniser when feed the dummy
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| 46 | * reader.
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| 47 | */
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| 48 | protected TokenStream tokenizer;
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| 49 |
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| 50 | /** The preview filetype. **/
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| 51 | protected final String preview_format = ApplicationSetup.getProperty("ImageDocument.preview_format", "jpg");
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| 52 | /** The preview size (width). **/
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| 53 | protected final String preview_width = ApplicationSetup.getProperty("ImageDocument.preview_width", "200");
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| 54 |
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| 55 | /** Default constructor. **/
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| 56 | protected ImageDocument() {}
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| 57 |
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| 58 | /** Constructs an instance of the ImageDocument from the given input stream.
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| 59 | * @param docStream the input stream that reads the file.
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| 60 | * @param docProperties the initial properties (docno, filename)
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| 61 | * @param tok the tokeniser defined for this collection
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| 62 | */
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| 63 | public ImageDocument(InputStream istream, Map<String,String> default_properties, Tokeniser tok)
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| 64 | {
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| 65 | logger.info("ImageDocument::ImageDocument()");
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| 66 | // Initialization from arguments
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| 67 | this.properties = default_properties;
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| 68 |
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| 69 | // Set properties
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| 70 | logger.info("ImageDocument - extracting properties");
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| 71 | // A. Hardcoded properties
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| 72 | this.properties.put("parser", "ImageDocument");
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| 73 | this.properties.put("abstract", "This is an image so here is some dummy text to prevent indexer failing.");
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| 74 | // B. Properties derived from filename
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| 75 | String title = this.properties.get("filename").substring(properties.get("filename").lastIndexOf(System.getProperty("file.separator")) + 1);
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| 76 | this.properties.put("title", title);
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| 77 | String ext = this.properties.get("filename").substring(properties.get("filename").lastIndexOf(".") + 1);
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| 78 | String target_filename = "doc." + ext;
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| 79 | this.properties.put("source","doc." + ext);
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[26207] | 80 | String assoc_filename = "D" + this.properties.get("docno");
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| 81 | if (assoc_filename.equals("Dnull"))
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| 82 | {
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| 83 | System.err.println("Error! Bogus assoc dir: " + this.properties.get("docno"));
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| 84 | System.exit(0);
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| 85 | }
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| 86 |
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[26186] | 87 | this.properties.put("assocfile", assoc_filename);
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| 88 |
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| 89 | // Copy (symlink) the file into place in the shared directory
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| 90 | Path source_path = Paths.get(properties.get("filename"));
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| 91 | Path assoc_path = Paths.get(ApplicationSetup.TERRIER_SHARE, "images", "assoc", assoc_filename);
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| 92 | assoc_path.toFile().mkdirs(); // bet there is a nice nio way to do this
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| 93 | Path target_path = assoc_path.resolve(target_filename);
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| 94 | if (target_path.toFile().exists())
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| 95 | {
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| 96 | logger.info("ImageDocument - removing existing (old) associated image");
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| 97 | try
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| 98 | {
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| 99 | Files.delete(target_path);
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| 100 | }
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| 101 | catch (Exception e)
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| 102 | {
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| 103 | logger.error("Exception while deleting old image: ", e);
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| 104 | }
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| 105 | }
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| 106 | logger.info("ImageDocument - symlinking image into assoc directory");
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| 107 | try
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| 108 | {
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| 109 | Files.createSymbolicLink(target_path, source_path);
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| 110 | }
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| 111 | // not supported? We'll try copying below
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| 112 | catch (UnsupportedOperationException ex)
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| 113 | {
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| 114 | }
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| 115 | // All other exceptions can be fatal
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| 116 | catch (Exception e)
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| 117 | {
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| 118 | logger.error("Exception while symlinking image: ", e);
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| 119 | }
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| 120 | // - copy if the file doesn't exist yet
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| 121 | if (!target_path.toFile().exists())
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| 122 | {
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| 123 | logger.info("ImageDocument - symlink filaed, copying instead");
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| 124 | try
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| 125 | {
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| 126 | Files.copy(source_path, target_path);
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| 127 | }
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| 128 | // Fatality!
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| 129 | catch (Exception e)
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| 130 | {
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| 131 | logger.error("Exception while copying image: ", e);
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| 132 | }
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| 133 | }
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| 134 |
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| 135 | // Generate preview image
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| 136 | logger.info("ImageDocument - generate preview image");
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| 137 | try
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| 138 | {
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| 139 | String preview_filename = this.generatePreview(source_path, assoc_path);
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| 140 | this.properties.put("preview",preview_filename);
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| 141 | }
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| 142 | catch (Exception e)
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| 143 | {
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| 144 | logger.error("Exception while generating preview image: ", e);
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| 145 | }
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| 146 |
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| 147 | // Create a dummy reader around some dummy text and then tokenize it
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| 148 | logger.info("ImageDocument - feed dummy text as token stream to indexer");
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| 149 | try
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| 150 | {
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| 151 | this.reader = new StringReader(this.properties.get("abstract"));
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| 152 | this.tokenizer = tok.tokenise(this.reader);
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| 153 | }
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| 154 | catch (Exception e)
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| 155 | {
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| 156 | logger.error("Exception while creating dummy text stream: ", e);
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| 157 | }
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| 158 | logger.info("ImageDocument - Complete!");
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| 159 | }
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| 160 | /** ImageDocument(InputStream istream, Map<String,String> default_properties, Tokeniser tok) **/
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| 161 |
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| 162 | /** Returns true when the end of the document has been reached, and there
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| 163 | * are no other terms to be retrieved from it.
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| 164 | * @return boolean true if there are no more terms in the document, otherwise
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| 165 | * it returns false.
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| 166 | */
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| 167 | public boolean endOfDocument()
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| 168 | {
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| 169 | return !this.tokenizer.hasNext();
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| 170 | }
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| 171 | /** endOfDocument() **/
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| 172 |
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| 173 | /** Use ImageMagick to generate a preview image.
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| 174 | * @pre assumes you have ImageMagick installed and available on Path
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| 175 | * @pre uses member variables preview_format and preview_width
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| 176 | * @return the filename of the preview image (within the assoc directory)
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| 177 | */
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| 178 | private String generatePreview(Path source_path, Path assoc_path)
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| 179 | throws Exception
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| 180 | {
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| 181 | String preview_filename = "preview." + this.preview_format;
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| 182 | Path preview_path = assoc_path.resolve(preview_filename);
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| 183 | String convert_command[] = {
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| 184 | "convert",
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| 185 | source_path.toString(),
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| 186 | "-resize",
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| 187 | this.preview_width + "x",
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| 188 | preview_path.toString()
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| 189 | };
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| 190 | logger.info("ImageDocument - convert command: " + Arrays.toString(convert_command));
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| 191 | Process convert_process = Runtime.getRuntime().exec(convert_command);
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| 192 | // Gobble up the streams to prevent them hanging the process when buffers
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| 193 | // are full
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| 194 | StreamGobbler convert_process_error_gobbler = new StreamGobbler(convert_process.getErrorStream());
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| 195 | convert_process_error_gobbler.start();
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| 196 | StreamGobbler convert_process_input_gobbler = new StreamGobbler(convert_process.getInputStream());
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| 197 | convert_process_input_gobbler.start();
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| 198 | // Let the conversion finish
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| 199 | int convert_status = convert_process.waitFor();
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| 200 | if (convert_status != 0 || !preview_path.toFile().exists())
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| 201 | {
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| 202 | throw new Exception("Convert command failed (exit status: " + convert_status + ")");
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| 203 | }
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| 204 | return preview_filename;
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| 205 | }
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| 206 | /** generatePreview(Path, Path) **/
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| 207 |
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| 208 | /** Returns the underlying map of all the properties defined by this Document.
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| 209 | * @since 1.1.0
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| 210 | */
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| 211 | public Map<String,String> getAllProperties()
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| 212 | {
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| 213 | return this.properties;
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| 214 | }
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| 215 | /** getAllProperties() **/
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| 216 |
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| 217 | /** Returns a list of the fields the current term appears in.
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| 218 | * @return HashSet a set of the terms that the current term appears in.
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| 219 | */
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| 220 | public Set<String> getFields()
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| 221 | {
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| 222 | // Returns null because there is no support for fields with file documents.
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| 223 | return Collections.emptySet();
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| 224 | }
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| 225 | /** getFields() **/
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| 226 |
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| 227 | /** Gets the next term of the document.
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| 228 | * <B>NB:</B>Null string returned from getNextTerm() should
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| 229 | * be ignored. They do not signify the lack of any more terms.
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| 230 | * endOfDocument() should be used to check that.
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| 231 | * @return String the next term of the document. Null returns should be
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| 232 | * ignored.
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| 233 | */
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| 234 | public String getNextTerm()
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| 235 | {
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| 236 | return this.tokenizer.next();
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| 237 | }
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| 238 | /** getNextTerm() **/
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| 239 |
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| 240 | /** Allows access to a named property of the Document. Examples might be URL,
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| 241 | * filename etc.
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| 242 | * @param name Name of the property. It is suggested, but not required that
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| 243 | * this name should not be case insensitive.
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| 244 | * @since 1.1.0
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| 245 | */
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| 246 | public String getProperty(String name)
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| 247 | {
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| 248 | return this.properties.get(name.toLowerCase());
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| 249 | }
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| 250 | /** getProperty(String name) **/
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| 251 |
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| 252 | /** Returns a Reader object so client code can tokenise the document
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| 253 | * or deal with the document itself. Examples might be extracting URLs,
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| 254 | * language detection. */
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| 255 | public Reader getReader()
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| 256 | {
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| 257 | return this.reader;
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| 258 | }
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| 259 | /** getReader() **/
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| 260 | }
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| 261 |
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