fr.inria.eventcloud.api.wrappers.BindingWrapper Maven / Gradle / Ivy

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/**
 * Copyright (c) 2011-2013 INRIA.
 * 
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 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 Affero General Public License
 * along with this program. If not, see 
 **/
package fr.inria.eventcloud.api.wrappers;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Iterator;

import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.sparql.core.Var;
import com.hp.hpl.jena.sparql.engine.binding.Binding;

import fr.inria.eventcloud.configuration.EventCloudProperties;
import fr.inria.eventcloud.utils.SparqlResultSerializer;

/**
 * BindingWrapper is used to make a Jena {@link Binding} serializable.
 * 
 * @author lpellegr
 */
public class BindingWrapper extends SparqlResultWrapper implements
        Binding {

    private static final long serialVersionUID = 160L;

    /**
     * Creates a {@link BindingWrapper} from the specified {@link Binding}.
     * 
     * @param binding
     *            the binding to make serializable.
     */
    public BindingWrapper(Binding binding) {
        super(binding);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void internalWriteObject(ObjectOutputStream out)
            throws IOException {
        SparqlResultSerializer.serialize(
                out, super.object, EventCloudProperties.COMPRESSION.getValue());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void internalReadObject(ObjectInputStream in) throws IOException,
            ClassNotFoundException {
        super.object =
                SparqlResultSerializer.deserializeBinding(
                        in, EventCloudProperties.COMPRESSION.getValue());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Iterator vars() {
        return super.object.vars();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean contains(Var var) {
        return super.object.contains(var);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Node get(Var var) {
        return super.object.get(var);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int size() {
        return super.object.size();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isEmpty() {
        return super.object.isEmpty();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        StringBuilder buf = new StringBuilder("(");

        if (super.object != null) {
            Iterator varsIt = this.vars();

            int i = 0;
            while (varsIt.hasNext()) {
                Var var = varsIt.next();
                buf.append(var);
                buf.append('=');
                buf.append(this.get(var));
                buf.append(", ");
                i++;
            }

            if (i > 0) {
                buf = buf.delete(buf.length() - 2, buf.length());
            }
        }

        buf.append(')');

        return buf.toString();
    }

}