PackageNamespaceElementResolver.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2010, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.solder.config.xml.parser.namespace;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.jboss.solder.config.xml.model.AnnotationXmlItem;
import org.jboss.solder.config.xml.model.ClassXmlItem;
import org.jboss.solder.config.xml.model.MethodXmlItem;
import org.jboss.solder.config.xml.model.ParameterXmlItem;
import org.jboss.solder.config.xml.model.PropertyXmlItem;
import org.jboss.solder.config.xml.model.XmlItem;
import org.jboss.solder.config.xml.model.XmlItemType;
import org.jboss.solder.config.xml.parser.SaxNode;
import org.jboss.solder.config.xml.util.TypeOccuranceInformation;
import org.jboss.solder.properties.Property;
import org.jboss.solder.properties.query.NamedPropertyCriteria;
import org.jboss.solder.properties.query.PropertyQueries;
import org.jboss.solder.properties.query.PropertyQuery;
import org.jboss.solder.reflection.Reflections;

public class PackageNamespaceElementResolver implements NamespaceElementResolver {
    private final String pack;
    private final Map<String, Class<?>> cache = new HashMap<String, Class<?>>();
    private final Set<String> notFound = new HashSet<String>();

    public PackageNamespaceElementResolver(String pack) {
        this.pack = pack + ".";
    }

    public XmlItem getItemForNamespace(SaxNode node, XmlItem parent) {
        String name = node.getName();
        if (notFound.contains(name)) {
            return null;
        }

        try {
            Class<?> c;
            if (cache.containsKey(name)) {
                c = cache.get(name);
            } else {
                c = getClass().getClassLoader().loadClass(pack + name);
                cache.put(name, c);
            }
            if (c.isAnnotation()) {
                return new AnnotationXmlItem(parent, c, node.getInnerText(), node.getAttributes(), node.getDocument(), node.getLineNo());
            } else {
                // if it is a method or constructor parameter
                if (parent != null && parent.getType() == XmlItemType.PARAMETERS) {
                    return new ParameterXmlItem(parent, c, node.getDocument(), node.getLineNo());
                } else {
                    return new ClassXmlItem(parent, c, node.getAttributes(), node.getDocument(), node.getLineNo());
                }
            }

        } catch (ClassNotFoundException e) {

        } catch (NoClassDefFoundError e) // this can get thrown when there is a
        // case insensitive file system
        {

        } catch (LinkageError e) {
            // this may be thrown by jboss modules instead of NoClassDefFoundError
        }
        if (parent != null) {
            // if the item can be a method of a FIELD
            if (TypeOccuranceInformation.isTypeInSet(parent.getAllowedItem(), XmlItemType.METHOD) || TypeOccuranceInformation.isTypeInSet(parent.getAllowedItem(), XmlItemType.FIELD)) {
                return resolveMethodOrField(name, parent, node);
            } else {
                notFound.add(name);
            }
        } else {
            notFound.add(name);
        }
        return null;
    }

    public static XmlItem resolveMethodOrField(String name, XmlItem parent, SaxNode node) {
        Class<?> p = parent.getJavaClass();
        boolean methodFound = Reflections.methodExists(p, name);
        PropertyQuery<Object> query = PropertyQueries.createQuery(parent.getJavaClass());
        query.addCriteria(new NamedPropertyCriteria(name));
        Property<Object> property = query.getFirstWritableResult();

        if (methodFound && property != null) {
            // if there is both a method and a field of the same name
            // we look for the <parameters> element
            for (SaxNode child : node.getChildren()) {
                if (child.getName().equals(XmlItemType.PARAMETERS.getElementName())) {
                    property = null;
                }
            }
            if (property != null) {
                methodFound = false;
            }
        }
        if (methodFound) {
            return new MethodXmlItem(parent, name, node.getDocument(), node.getLineNo());
        } else if (property != null) {
            // ensure the property is accessible
            property.setAccessible();
            return new PropertyXmlItem(parent, property, node.getInnerText(), null, node.getDocument(), node.getLineNo());
        }
        return null;
    }
}