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Diffstat (limited to 'libjava/classpath/gnu/java/util/prefs/NodeReader.java')
| -rw-r--r-- | libjava/classpath/gnu/java/util/prefs/NodeReader.java | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/prefs/NodeReader.java b/libjava/classpath/gnu/java/util/prefs/NodeReader.java new file mode 100644 index 000000000..0a49fc777 --- /dev/null +++ b/libjava/classpath/gnu/java/util/prefs/NodeReader.java @@ -0,0 +1,221 @@ +/* NodeReader - Reads and imports preferences nodes from files + Copyright (C) 2001 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.util.prefs; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.Reader; +import java.util.prefs.InvalidPreferencesFormatException; +import java.util.prefs.Preferences; +import java.util.prefs.PreferencesFactory; + +/** + * Reads and imports preferences nodes from files. + * + * @author Mark Wielaard (mark@klomp.org) + */ +public class NodeReader { + + private final BufferedReader br; + private String line = ""; + + private final PreferencesFactory factory; + + public NodeReader(Reader r, PreferencesFactory factory) { + if(r instanceof BufferedReader) { + br = (BufferedReader) r; + } else { + br = new BufferedReader(r); + } + this.factory = factory; + } + + public NodeReader(InputStream is, PreferencesFactory factory) { + this(new InputStreamReader(is), factory); + } + + public void importPreferences() + throws InvalidPreferencesFormatException, IOException + { + readPreferences(); + } + + private void readPreferences() + throws InvalidPreferencesFormatException, IOException + { + // Begin starting tag + skipTill("<preferences"); + + readRoot(); + + // Ending tag + skipTill("</preferences>"); + } + + private void readRoot() + throws InvalidPreferencesFormatException, IOException + { + // Begin starting tag + skipTill("<root"); + + // type attribute + skipTill("type=\""); + String type = readTill("\""); + Preferences root; + if ("user".equals(type)) { + root = factory.userRoot(); + } else if ("system".equals(type)) { + root = factory.systemRoot(); + } else { + throw new InvalidPreferencesFormatException("Unknown type: " + + type); + } + + // Read root map and subnodes + readMap(root); + readNodes(root); + + // Ending tag + skipTill("</root>"); + } + + private void readNodes(Preferences node) + throws InvalidPreferencesFormatException, IOException + { + while ("node".equals(nextTag())) { + skipTill("<node"); + skipTill("name=\""); + String name = readTill("\""); + Preferences subnode = node.node(name); + readMap(subnode); + readNodes(subnode); + skipTill("</node>"); + } + + } + + private void readMap(Preferences node) + throws InvalidPreferencesFormatException, IOException + { + // Begin map tag + skipTill("<map"); + + // Empty map? + if (line.startsWith("/>")) { + line = line.substring(2); + return; + } + + // Map entries + readEntries(node); + + // Ending tag + skipTill("</map>"); + } + + private void readEntries(Preferences node) + throws InvalidPreferencesFormatException, IOException + { + while ("entry".equals(nextTag())) { + skipTill("<entry"); + skipTill("key=\""); + String key = readTill("\""); + skipTill("value=\""); + String value = readTill("\""); + node.put(key, value); + } + } + + private void skipTill(String s) + throws InvalidPreferencesFormatException, IOException + { + while(true) { + if (line == null) + throw new InvalidPreferencesFormatException(s + " not found"); + + int index = line.indexOf(s); + if (index == -1) { + line = br.readLine(); + } else { + line = line.substring(index+s.length()); + return; + } + } + } + + private String readTill(String s) + throws InvalidPreferencesFormatException + { + int index = line.indexOf(s); + if (index == -1) + throw new InvalidPreferencesFormatException(s + " not found"); + + String read = line.substring(0, index); + line = line.substring(index+s.length()); + + return read; + } + + private String nextTag() + throws InvalidPreferencesFormatException, IOException + { + while(true) { + if (line == null) + throw new InvalidPreferencesFormatException("unexpected EOF"); + + int start = line.indexOf("<"); + if (start == -1) { + line = br.readLine(); + } else { + // Find end of tag + int end = start+1; + while (end != line.length() + && " \t\r\n".indexOf(line.charAt(end)) == -1) { + end++; + } + // Line now starts at the found tag + String tag = line.substring(start+1,end); + line = line.substring(start); + return tag; + } + } + } + +} |