FilterParser.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2015 The Gridarta Developers.
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package net.sf.gridarta.model.filter;

import java.util.Map.Entry;
import net.sf.gridarta.utils.XmlUtils;
import net.sf.gridarta.utils.xml.ElementsIterable;
import nu.xom.Element;
import nu.xom.Elements;
import nu.xom.ParentNode;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class FilterParser {

    @Nullable
    private Element element;

    @NotNull
    private final FilterConfigVisitor toXMLFilterConfigVisitor = new FilterConfigVisitor() {

        @Override
        public void visit(@NotNull final NamedFilterConfig filterConfig) {
            final Element result = new Element("value");

            final Element enabled = new Element("enabled");
            enabled.appendChild(Boolean.toString(filterConfig.isEnabled()));
            result.appendChild(enabled);

            final Element inverted = new Element("inverted");
            inverted.appendChild(Boolean.toString(filterConfig.isInverted()));
            result.appendChild(inverted);

            for (final Entry<String, FilterConfig<?, ?>> entry : filterConfig.getEntries().entrySet()) {
                final String key = entry.getKey();
                final FilterConfig<?, ?> subFilterConfig = entry.getValue();
                final Element filterValue = toXML(subFilterConfig);
                final ParentNode subFilter = new Element("subfilter");
                final Element fName = new Element("name");
                fName.appendChild(key);
                subFilter.appendChild(fName);
                subFilter.appendChild(filterValue);
                result.appendChild(subFilter);
            }
            element = result;
        }

        @Override
        public void visit(@NotNull final NamedGameObjectMatcherFilterConfig filterConfig) {
            final Element value = new Element("value");

            final Element enabled = new Element("enabled");
            enabled.appendChild(Boolean.toString(filterConfig.isEnabled()));
            value.appendChild(enabled);

            for (final String key : filterConfig.getProperties()) {
                final Element property = new Element("property");
                property.appendChild(filterConfig.getProperty(key));
                value.appendChild(property);
            }
            element = value;
        }

    };

    @NotNull
    private final FilterConfigVisitor fromXMLFilterConfigVisitor = new FilterConfigVisitor() {

        @Override
        public void visit(@NotNull final NamedFilterConfig filterConfig) {
            filterConfig.getFilter().resetConfig(filterConfig);
            if (element == null) {
                return;
            }

            final Elements valueElements = element.getChildElements("value");
            if (valueElements.size() == 0) {
                return;
            }
            final Element value = valueElements.get(0);

            final boolean enabled = Boolean.valueOf(XmlUtils.getChild(value, "enabled").getValue().trim());
            filterConfig.setEnabled(enabled);
            filterConfig.setInverted(Boolean.valueOf(XmlUtils.getChild(value, "inverted").getValue().trim()));
            for (final Element filterElement : new ElementsIterable(value.getChildElements("subfilter"))) {
                final String name = XmlUtils.getChild(filterElement, "name").getValue().trim();
                final FilterConfig<?, ?> subFilterConfig = filterConfig.getConfig(name);
                fromXML(filterElement, subFilterConfig);
            }
        }

        @Override
        public void visit(@NotNull final NamedGameObjectMatcherFilterConfig filterConfig) {
            if (element == null) {
                return;
            }

            final Elements valueElements = element.getChildElements("value");
            if (valueElements.size() == 0) {
                return;
            }
            final Element value = valueElements.get(0);

            final boolean enabled = Boolean.valueOf(XmlUtils.getChild(value, "enabled").getValue().trim());
            filterConfig.setEnabled(enabled);
            for (final Element property : new ElementsIterable(value.getChildElements("property"))) {
                final String pName = XmlUtils.getChild(property, "name").getValue().trim();
                final String pValue = XmlUtils.getChild(property, "value").getValue().trim();
                filterConfig.setProperty(pName, pValue);
            }
        }

    };

    @NotNull
    public Element toXML(@NotNull final FilterConfig<?, ?> filterConfig) {
        final Element prevElement = element;
        try {
            element = null;
            filterConfig.accept(toXMLFilterConfigVisitor);
            assert element != null;
            return element;
        } finally {
            element = prevElement;
        }
    }

    public void fromXML(@NotNull final Element element, @NotNull final FilterConfig<?, ?> filterConfig) {
        final Element prevElement = this.element;
        try {
            this.element = element;
            filterConfig.accept(fromXMLFilterConfigVisitor);
        } finally {
            this.element = prevElement;
        }
    }

}