JavaClassDescriptor.java

/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services 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.
 *
 *   Granite Data Services 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 library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
package org.granite.messaging.amf.io.util;

import java.io.Externalizable;
import java.util.List;
import java.util.Map;

import org.granite.config.ConvertersConfig;
import org.granite.config.ExternalizersConfig;
import org.granite.config.api.AliasRegistryConfig;
import org.granite.context.GraniteContext;
import org.granite.messaging.amf.io.convert.Converters;
import org.granite.messaging.amf.io.util.externalizer.Externalizer;

/**
 * @author Franck WOLFF
 */
public abstract class JavaClassDescriptor {

    protected final Class<?> type;
    protected final String name;
    protected final Externalizer externalizer;
    protected final Converters converters;
    protected final byte encoding;
    protected final Property[] properties;

    protected JavaClassDescriptor(Class<?> type) {
        Object config = GraniteContext.getCurrentInstance().getGraniteConfig();
        this.type = type;
        this.name = getClassName(type);
        this.externalizer = ((ExternalizersConfig)config).getExternalizer(type.getName());
        this.converters = ((ConvertersConfig)config).getConverters();
        this.encoding = findEncoding(type);
        
        List<Property> properties = introspectProperties();
        this.properties = (properties != null ? properties.toArray(new Property[0]) : new Property[0]);
    }

    private byte findEncoding(Class<?> type) {
        if (externalizer != null || Externalizable.class.isAssignableFrom(type))
            return 0x01;
        if (Map.class.isAssignableFrom(type))
            return 0x02;
        return 0x00;
    }

    protected abstract List<Property> introspectProperties();

    public static String getClassName(Class<?> clazz) {
        if (Map.class.isAssignableFrom(clazz) && !Externalizable.class.isAssignableFrom(clazz)) {
            Externalizer externalizer = ((ExternalizersConfig)GraniteContext.getCurrentInstance().getGraniteConfig()).getExternalizer(clazz.getName());
            if (externalizer == null)
            	return "";
        }
        return ((AliasRegistryConfig)GraniteContext.getCurrentInstance().getGraniteConfig()).getAliasRegistry().getAliasForType(clazz.getName());
    }
    
    public Class<?> getType() {
        return type;
    }

    public String getName() {
        return name;
    }

    public Externalizer getExternalizer() {
        return externalizer;
    }

    public byte getEncoding() {
        return encoding;
    }

    public boolean isExternalizable() {
        return encoding == 0x01;
    }

    public boolean isDynamic() {
        return encoding == 0x02;
    }

    public int getPropertiesCount() {
        return properties.length;
    }

    public Property getProperty(int index) {
        return properties[index];
    }
    
    public String getPropertyName(int index) {
        return properties[index].getName();
    }

    public Object getPropertyValue(int index, Object instance) {
        return properties[index].getValue(instance);
    }
}