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java/alt2xml-in-fs/src/cz/frantovo/alt2xml/in/fs/Reader.java
author František Kučera <franta-hg@frantovo.cz>
Sun, 02 Oct 2016 15:23:20 +0200
changeset 109 76df01fc4aa2
parent 106 02739f60b1ec
child 111 e4900596abdb
permissions -rw-r--r--
in-fs: comment, symlinks 
     1 /**

     2  * Alt2XML

     3  * Copyright © 2014 František Kučera (frantovo.cz)

     4  *

     5  * This program is free software: you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation, either version 3 of the License, or

     8  * (at your option) any later version.

     9  *

    10  * This program is distributed in the hope that it will be useful,

    11  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

    13  * GNU General Public License for more details.

    14  *

    15  * You should have received a copy of the GNU General Public License

    16  * along with this program. If not, see <http://www.gnu.org/licenses/>.

    17  */

    18 package cz.frantovo.alt2xml.in.fs;

    19 

    20 import cz.frantovo.alt2xml.AbstractAlt2XmlReader;

    21 import java.io.File;

    22 import java.io.IOException;

    23 import java.net.URI;

    24 import java.net.URISyntaxException;

    25 import java.nio.ByteBuffer;

    26 import java.nio.file.Files;

    27 import java.nio.file.LinkOption;

    28 import java.nio.file.Path;

    29 import java.nio.file.attribute.PosixFilePermission;

    30 import java.nio.file.attribute.UserDefinedFileAttributeView;

    31 import java.nio.file.spi.FileSystemProvider;

    32 import java.util.List;

    33 import java.util.ArrayList;

    34 import java.util.Set;

    35 import java.util.logging.Logger;

    36 import org.xml.sax.Attributes;

    37 import org.xml.sax.InputSource;

    38 import org.xml.sax.SAXException;

    39 import org.xml.sax.helpers.AttributesImpl;

    40 

    41 /**

    42  * Reads filesystem – hierarchical structure of directories and files.

    43  *

    44  * @author Ing. František Kučera (frantovo.cz)

    45  */

    46 public class Reader extends AbstractAlt2XmlReader {

    47 

    48 	public static final String ROOT_ELEMENT = "fs";

    49 	public static final String DIR_ELEMENT = "dir";

    50 	public static final String FILE_ELEMENT = "file";

    51 	public static final String XATTR_ELEMENT = "xattr";

    52 	public static final String PERMISSIONS_ELEMENT = "mode";

    53 	public static final String PERMISSIONS_U_ELEMENT = "user";

    54 	public static final String PERMISSIONS_G_ELEMENT = "group";

    55 	public static final String PERMISSIONS_O_ELEMENT = "others";

    56 	public static final String NAME_ATTRIBUTE = "name";

    57 	public static final String ABSOLUTE_PATH_ATTRIBUTE = "path";

    58 	public static final String SIZE_ATTRIBUTE = "size";

    59 	private static final Logger log = Logger.getLogger(Reader.class.getName());

    60 

    61 	/**

    62 	 * indentation level

    63 	 */

    64 	private int level = 0;

    65 

    66 	@Override

    67 	public void parse(InputSource input) throws IOException, SAXException {

    68 		File dir = getFile(input.getSystemId());

    69 

    70 		outputStart(dir);

    71 		outputDir(dir);

    72 		outputEnd();

    73 	}

    74 

    75 	private File getFile(String systemId) throws IOException {

    76 		try {

    77 			return new File(new URI(systemId));

    78 		} catch (URISyntaxException e) {

    79 			throw new IOException("Invalid dir URI", e);

    80 		}

    81 	}

    82 

    83 	private String getAbsolutePath(File file) throws IOException {

    84 		return file.getCanonicalFile().getAbsolutePath();

    85 	}

    86 

    87 	private Attributes singleAttribute(String name, int value) {

    88 		AttributesImpl attributes = new AttributesImpl();

    89 		addAttribute(attributes, name, value);

    90 		return attributes;

    91 	}

    92 

    93 	private Attributes singleAttribute(String name, String value) {

    94 		AttributesImpl attributes = new AttributesImpl();

    95 		addAttribute(attributes, name, value);

    96 		return attributes;

    97 	}

    98 

    99 	private void addAttribute(AttributesImpl attributes, String name, int value) {

   100 		attributes.addAttribute(null, name, name, "xs:int", String.valueOf(value));

   101 	}

   102 

   103 	private void addAttribute(AttributesImpl attributes, String name, long value) {

   104 		attributes.addAttribute(null, name, name, "xs:long", String.valueOf(value));

   105 	}

   106 

   107 	private void addAttribute(AttributesImpl attributes, String name, String value) {

   108 		attributes.addAttribute(null, name, name, "xs:string", value);

   109 	}

   110 

   111 	private void outputStart(File root) throws SAXException, IOException {

   112 		contentHandler.startDocument();

   113 		contentHandler.lineBreak();

   114 		contentHandler.startElement(null, null, ROOT_ELEMENT, singleAttribute(ABSOLUTE_PATH_ATTRIBUTE, getAbsolutePath(root)));

   115 		contentHandler.lineBreak();

   116 	}

   117 

   118 	private void outputEnd() throws SAXException {

   119 		contentHandler.endElement(null, null, ROOT_ELEMENT);

   120 		contentHandler.lineBreak();

   121 		contentHandler.endDocument();

   122 	}

   123 

   124 	private void outputFile(File file) throws SAXException, IOException {

   125 		level++;

   126 

   127 		AttributesImpl attributes = new AttributesImpl();

   128 		addAttribute(attributes, NAME_ATTRIBUTE, file.getName());

   129 		addAttribute(attributes, ABSOLUTE_PATH_ATTRIBUTE, getAbsolutePath(file));

   130 		addAttribute(attributes, SIZE_ATTRIBUTE, file.length());

   131 

   132 		contentHandler.indentation(level);

   133 		contentHandler.startElement(null, null, FILE_ELEMENT, attributes);

   134 		contentHandler.lineBreak();

   135 

   136 		outputPermissions(file.toPath());

   137 		outputExtendedAttributes(file);

   138 

   139 		contentHandler.indentation(level);

   140 		contentHandler.endElement(null, null, FILE_ELEMENT);

   141 		contentHandler.lineBreak();

   142 

   143 		level--;

   144 	}

   145 

   146 	private void outputDir(File dir) throws SAXException, IOException {

   147 		level++;

   148 

   149 		final File[] children = dir.listFiles();

   150 

   151 		AttributesImpl attributes = new AttributesImpl();

   152 		addAttribute(attributes, NAME_ATTRIBUTE, dir.getName());

   153 		addAttribute(attributes, ABSOLUTE_PATH_ATTRIBUTE, getAbsolutePath(dir));

   154 		addAttribute(attributes, SIZE_ATTRIBUTE, children.length);

   155 

   156 		contentHandler.indentation(level);

   157 		contentHandler.startElement(null, null, DIR_ELEMENT, attributes);

   158 		contentHandler.lineBreak();

   159 

   160 		outputPermissions(dir.toPath());

   161 		outputExtendedAttributes(dir);

   162 

   163 		for (File file : children) {

   164 			if (file.isDirectory()) {

   165 				outputDir(file);

   166 			} else {

   167 				outputFile(file);

   168 			}

   169 		}

   170 

   171 		contentHandler.indentation(level);

   172 		contentHandler.endElement(null, null, DIR_ELEMENT);

   173 		contentHandler.lineBreak();

   174 

   175 		level--;

   176 	}

   177 

   178 	private String encodeElementName(String originalName) {

   179 		/**

   180 		 * TODO: encode and/or skip invalid characters

   181 		 */

   182 		return originalName;

   183 	}

   184 

   185 	private void outputPermissions(Path path) throws IOException, SAXException {

   186 		level++;

   187 		Set<PosixFilePermission> permissions = Files.getPosixFilePermissions(path); // TODO: maybe symlinks: LinkOption.NOFOLLOW_LINKS

   188 

   189 		contentHandler.indentation(level);

   190 		contentHandler.startElement(null, PERMISSIONS_ELEMENT, PERMISSIONS_ELEMENT, singleAttribute("octal", getOctal(permissions)));

   191 		contentHandler.lineBreak();

   192 

   193 		level++;

   194 

   195 		outputPermission("owner", permissions.contains(PosixFilePermission.OWNER_READ), permissions.contains(PosixFilePermission.OWNER_WRITE), permissions.contains(PosixFilePermission.OWNER_EXECUTE));

   196 		outputPermission("group", permissions.contains(PosixFilePermission.GROUP_READ), permissions.contains(PosixFilePermission.GROUP_WRITE), permissions.contains(PosixFilePermission.GROUP_EXECUTE));

   197 		outputPermission("others", permissions.contains(PosixFilePermission.OTHERS_READ), permissions.contains(PosixFilePermission.OTHERS_WRITE), permissions.contains(PosixFilePermission.OTHERS_EXECUTE));

   198 

   199 		level--;

   200 

   201 		contentHandler.indentation(level);

   202 		contentHandler.endElement(null, PERMISSIONS_ELEMENT, PERMISSIONS_ELEMENT);

   203 		contentHandler.lineBreak();

   204 

   205 		level--;

   206 	}

   207 

   208 	private int getOctal(Set<PosixFilePermission> permissions) {

   209 		int octal = 0;

   210 

   211 		octal = octal + 100 * (permissions.contains(PosixFilePermission.OWNER_READ) ? 4 : 0);

   212 		octal = octal + 100 * (permissions.contains(PosixFilePermission.OWNER_WRITE) ? 2 : 0);

   213 		octal = octal + 100 * (permissions.contains(PosixFilePermission.OWNER_EXECUTE) ? 1 : 0);

   214 

   215 		octal = octal + 10 * (permissions.contains(PosixFilePermission.GROUP_READ) ? 4 : 0);

   216 		octal = octal + 10 * (permissions.contains(PosixFilePermission.GROUP_WRITE) ? 2 : 0);

   217 		octal = octal + 10 * (permissions.contains(PosixFilePermission.GROUP_EXECUTE) ? 1 : 0);

   218 

   219 		octal = octal + 1 * (permissions.contains(PosixFilePermission.OTHERS_READ) ? 4 : 0);

   220 		octal = octal + 1 * (permissions.contains(PosixFilePermission.OTHERS_WRITE) ? 2 : 0);

   221 		octal = octal + 1 * (permissions.contains(PosixFilePermission.OTHERS_EXECUTE) ? 1 : 0);

   222 

   223 		return octal;

   224 	}

   225 

   226 	private void outputPermission(String name, boolean read, boolean write, boolean execute) throws SAXException {

   227 		contentHandler.indentation(level);

   228 		AttributesImpl attributes = new AttributesImpl();

   229 		attributes.addAttribute(null, "read", "read", "xs:boolean", String.valueOf(read));

   230 		attributes.addAttribute(null, "write", "write", "xs:boolean", String.valueOf(write));

   231 		attributes.addAttribute(null, "execute", "execute", "xs:boolean", String.valueOf(execute));

   232 		contentHandler.startElement(null, name, name, attributes);

   233 		contentHandler.endElement(null, name, name);

   234 		contentHandler.lineBreak();

   235 	}

   236 

   237 	private void outputExtendedAttributes(File file) throws IOException, SAXException {

   238 		level++;

   239 

   240 		final List<ExtendedAttribute> extendedAttributes = getExtendedAttributes(file);

   241 

   242 		if (!extendedAttributes.isEmpty()) {

   243 			contentHandler.indentation(level);

   244 			contentHandler.startElement(null, XATTR_ELEMENT, XATTR_ELEMENT, null);

   245 			contentHandler.lineBreak();

   246 			level++;

   247 			for (ExtendedAttribute ea : extendedAttributes) {

   248 				contentHandler.indentation(level);

   249 				String elementName = encodeElementName(ea.getKey());

   250 				contentHandler.textElement(ea.getValue(), null, elementName, elementName, null);

   251 				contentHandler.lineBreak();

   252 			}

   253 			level--;

   254 			contentHandler.indentation(level);

   255 			contentHandler.endElement(null, XATTR_ELEMENT, XATTR_ELEMENT);

   256 			contentHandler.lineBreak();

   257 		}

   258 

   259 		level--;

   260 	}

   261 

   262 	private List<ExtendedAttribute> getExtendedAttributes(File file) throws IOException {

   263 

   264 		List<ExtendedAttribute> l = new ArrayList<>();

   265 

   266 		Path path = file.toPath();

   267 		FileSystemProvider provider = path.getFileSystem().provider();

   268 		UserDefinedFileAttributeView attributes = provider.getFileAttributeView(path, UserDefinedFileAttributeView.class);

   269 

   270 		for (String jménoAtributu : attributes.list()) {

   271 			ByteBuffer hodnotaAtributu = ByteBuffer.allocate(attributes.size(jménoAtributu));

   272 			attributes.read(jménoAtributu, hodnotaAtributu);

   273 			l.add(new ExtendedAttribute(jménoAtributu, hodnotaAtributu));

   274 		}

   275 

   276 		return l;

   277 

   278 	}

   279 }
alt2xml