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/**

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     [email protected]

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; version 2 of the License.

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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
/*
 * Created on Aug 25, 2011
 */

package com.bigdata.rdf.sparql.ast;

import java.io.Serializable;
import java.util.LinkedHashSet;
import java.util.Set;

import cern.colt.Arrays;

import com.bigdata.bop.IValueExpression;
import com.bigdata.bop.IVariable;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.internal.constraints.INeedsMaterialization;

/**
 * Computed {@link INeedsMaterialization} metadata for an
 * {@link IValueExpression}.
 * 
 * @author Bryan Thompson
 * @version $Id: ComputedMaterializationRequirement.java 5179 2011-09-12
 *          20:13:25Z thompsonbry $
 */
@SuppressWarnings("rawtypes")
public class ComputedMaterializationRequirement implements
        INeedsMaterialization, Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private final Requirement requirement;

    private final Set> varsToMaterialize;

    @Override
    public String toString() {

        return "{requirement=" + requirement + ", vars=" + Arrays.toString(varsToMaterialize.toArray())
                + "}";

    }
    
    public ComputedMaterializationRequirement(final Requirement requirement,
            final Set> varsToMaterialize) {
    
        this.requirement = requirement;
        
        this.varsToMaterialize = varsToMaterialize;
    }

    public ComputedMaterializationRequirement(final IValueExpression ve) {
        
        varsToMaterialize = new LinkedHashSet>();

        requirement = StaticAnalysis.gatherVarsToMaterialize(ve, varsToMaterialize);

    }

    @Override
    public Requirement getRequirement() {
        
        return requirement;
        
    }

    public Set> getVarsToMaterialize() {
        
        return varsToMaterialize;

    }

    @Override
    public boolean equals(final Object o) {
        
        if (this == o)
            return true;
        
        if (!(o instanceof ComputedMaterializationRequirement))
            return false;
        
        final ComputedMaterializationRequirement t = (ComputedMaterializationRequirement) o;
        
        if (requirement != t.requirement)
            return false;
        
        if (!varsToMaterialize.equals(t.varsToMaterialize))
            return false;
        
        return true;
    
    }
    
}