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src/org/herac/tuxguitar/gui/system/keybindings/xml/KeyBindingReader.java

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package org.herac.tuxguitar.gui.system.keybindings.xml;

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import java.io.File;

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import java.io.IOException;

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import java.util.HashMap;

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import java.util.Map;

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import javax.xml.parsers.DocumentBuilder;

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import javax.xml.parsers.DocumentBuilderFactory;

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import javax.xml.parsers.ParserConfigurationException;

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import org.herac.tuxguitar.gui.TuxGuitar;

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import org.herac.tuxguitar.gui.system.keybindings.KeyBinding;

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import org.w3c.dom.Document;

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import org.w3c.dom.NamedNodeMap;

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import org.w3c.dom.Node;

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import org.w3c.dom.NodeList;

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import org.xml.sax.SAXException;

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public class KeyBindingReader {

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        private static final String SHORTCUT_TAG = "shortcut";

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        private static final String ACTION_ATTRIBUTE = "action";

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        private static final String KEYS_ATTRIBUTE = "keys";

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    public static Map getKeyBindings(String fileName) {

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        Map bindings = null;

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        try{

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                File file = new File(fileName);

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                if (file.exists()){

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                        Document doc = getDocument(file);

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                        bindings = getBindings(doc.getFirstChild());

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                }

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        }catch(Exception e){

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                e.printStackTrace();

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        }

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        return bindings;

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    }

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    private static Document getDocument(File file) {

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        Document document = null;

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        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

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        try {

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            DocumentBuilder builder = factory.newDocumentBuilder();

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            document = builder.parse(file);

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        } catch (SAXException sxe) {

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            sxe.printStackTrace();

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        } catch (ParserConfigurationException pce) {

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            pce.printStackTrace();

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        } catch (IOException ioe) {

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            ioe.printStackTrace();

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        }

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        return document;

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    }

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    /**

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     * Read shortcuts from xml file

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     * 

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     * @param shortcutsNode

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     * @return

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     */

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    private static Map getBindings(Node shortcutsNode){

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        Map bindings = new HashMap();

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        NodeList nodeList = shortcutsNode.getChildNodes();

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        for (int i = 0; i < nodeList.getLength(); i++) {

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            Node child = nodeList.item(i);

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            String nodeName = child.getNodeName();

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            if (nodeName.equals(SHORTCUT_TAG)) {

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                NamedNodeMap params = child.getAttributes();

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                String key = params.getNamedItem(KEYS_ATTRIBUTE).getNodeValue();

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                String action = params.getNamedItem(ACTION_ATTRIBUTE).getNodeValue();

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                if (key == null || action == null || key.trim().equals("") || action.trim().equals("")){

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                        throw new RuntimeException("Invalid KeyBinding file format.");

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                }

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                bindings.put(KeyBinding.parse(key),TuxGuitar.instance().getAction(action));

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            }

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        }

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        return bindings;

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    }

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}

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