/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.db.common.request;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;

public abstract class ResourceRead<T> extends ResourceReadBase<T> {

    final protected Resource resource;
    
    @Override
    public int hashCode() {
        return resource.hashCode() + classHash();
    }

    @Override
    public boolean equals(Object object) {
        if (this == object)
            return true;
        else if (object == null)
            return false;
        else if (getClass() != object.getClass())
            return false;
        ResourceRead<?> r = (ResourceRead<?>) object;
        return resource.equals(r.resource);
    }

    protected ResourceRead(Resource resource) {
    	if(resource == null) throw new IllegalArgumentException("Null resource.");
        this.resource = resource;
    }
    
    @Override
    final public boolean isImmutable(ReadGraph graph) throws DatabaseException {
    	return graph.isImmutable(resource);
    }

    @Override
    final public String toString() {
    	return getClass().getSimpleName() + "|" + resource; 
    }
    
}