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/*
 Copyright 2013 Red Hat, Inc. and/or its affiliates.

 This file is part of lightblue.

 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, 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 General Public License
 along with this program.  If not, see .
 */
package com.redhat.lightblue.assoc;

import java.io.Serializable;

import java.util.List;
import java.util.ArrayList;

/**
 * Instances of this class is used to associate additional data to
 * query plan nodes and edges. The actual implementation of
 * QueryPlanData is determined by the caller based on the iterator and
 * scorer used. It is expected that particular iterator and scorers
 * will need different types of data associated with nodes to process
 * the query plan. 
 *
 * Subclasses should override the newInstance and copyFrom methods
 */
public class QueryPlanData implements Serializable {

    private static final long serialVersionUID=1l;
    
    private List conjuncts=new ArrayList<>();
    
    /**
     * The query clauses associated with this node/edge
     */
    public List getConjuncts() {
        return conjuncts;
    }

    /**
     * The query clauses associated with this node/edge
     */
    public void setConjuncts(List l) {
        conjuncts=l;
    }

    /**
     * Copies contents of source into this. Subclasses should override this
     */
    public void copyFrom(QueryPlanData source) {
        if(source.conjuncts!=null)
            conjuncts=new ArrayList<>(source.conjuncts);
        else
            conjuncts=null;
    }

    /**
     * Creates a new instance. Subclasses should override this
     */
    public QueryPlanData newInstance() {
        return new QueryPlanData();
    }

    @Override
    public String toString() {
        return "Conjuncts:"+conjuncts;
    }
}