source: josm/trunk/src/org/openstreetmap/josm/data/preferences/PreferencesWriter.java@ 9823

// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.data.preferences;

import java.io.PrintWriter;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.Version;
import org.openstreetmap.josm.io.XmlWriter;

/**
 * Write preferences to XML.
 */
public class PreferencesWriter extends XmlWriter implements SettingVisitor {
    private final boolean noPassword;
    private final boolean defaults;
    private String key;

    /**
     * Construct new {@code PreferencesWriter}.
     * @param out the {@link PrintWriter}
     * @param noPassword if password must be excluded
     * @param defaults true, if default values are converted to XML, false for
     * regular preferences
     */
    public PreferencesWriter(PrintWriter out, boolean noPassword, boolean defaults) {
        super(out);
        this.noPassword = noPassword;
        this.defaults = defaults;
    }

    /**
     * Write preferences.
     *
     * @param settings preferences settings to write
     */
    public void write(Collection<Map.Entry<String, Setting<?>>> settings) {
        out.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
        String rootElement = defaults ? "preferences-defaults" : "preferences";
        out.write(String.format("<%s xmlns='%s/preferences-1.0'", rootElement, Main.getXMLBase()));
        if (defaults) {
            out.write(" xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'");
        }
        out.write(String.format(" version='%d'>\n", Version.getInstance().getVersion()));
        for (Map.Entry<String, Setting<?>> e : settings) {
            setKey(e.getKey());
            e.getValue().visit(this);
        }
        out.write(String.format("</%s>\n", rootElement));
    }

    private void setKey(String key) {
        this.key = key;
    }

    private void addTime(Setting setting) {
        if (defaults) {
            Long time = setting.getTime();
            if (time == null) throw new IllegalStateException();
            out.write("' time='" + time);
        }
    }

    @Override
    public void visit(StringSetting setting) {
        if (noPassword && "osm-server.password".equals(key))
            return; // do not store plain password.
        out.write("  <tag key='");
        out.write(XmlWriter.encode(key));
        addTime(setting);
        if (setting.getValue() != null) {
            out.write("' value='");
            out.write(XmlWriter.encode(setting.getValue()));
            out.write("'/>\n");
        } else if (defaults) {
            out.write("' xsi:nil='true'/>\n");
        } else {
            throw new NullPointerException();
        }
    }

    @Override
    public void visit(ListSetting setting) {
        out.write("  <list key='" + XmlWriter.encode(key));
        addTime(setting);
        if (setting.getValue() != null) {
            out.write("'>\n");
            for (String s : setting.getValue()) {
                out.write("    <entry value='" + XmlWriter.encode(s) + "'/>\n");
            }
            out.write("  </list>\n");
        } else if (defaults) {
            out.write("' xsi:nil='true'/>\n");
        } else {
            throw new NullPointerException();
        }
    }

    @Override
    public void visit(ListListSetting setting) {
        out.write("  <lists key='" + XmlWriter.encode(key));
        addTime(setting);
        if (setting.getValue() != null) {
            out.write("'>\n");
            for (List<String> list : setting.getValue()) {
                out.write("    <list>\n");
                for (String s : list) {
                    out.write("      <entry value='" + encode(s) + "'/>\n");
                }
                out.write("    </list>\n");
            }
            out.write("  </lists>\n");
        } else if (defaults) {
            out.write("' xsi:nil='true'/>\n");
        } else {
            throw new NullPointerException();
        }
    }

    @Override
    public void visit(MapListSetting setting) {
        out.write("  <maps key='" + encode(key));
        addTime(setting);
        if (setting.getValue() != null) {
            out.write("'>\n");
            for (Map<String, String> struct : setting.getValue()) {
                out.write("    <map>\n");
                for (Map.Entry<String, String> e : struct.entrySet()) {
                    out.write(String.format("      <tag key='%s' value='%s'/>\n", encode(e.getKey()), encode(e.getValue())));
                }
                out.write("    </map>\n");
            }
            out.write("  </maps>\n");
        } else if (defaults) {
            out.write("' xsi:nil='true'/>\n");
        } else {
            throw new NullPointerException();
        }
    }

}