/**
 * Copyright (C) 2009-2013 FoundationDB, LLC
 *
 * 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 Affero 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 <http://www.gnu.org/licenses/>.
 */

package com.foundationdb.sql.optimizer.plan;

public abstract class BasePlanWithInput extends BasePlanNode implements PlanWithInput
{
    private PlanNode input;

    protected BasePlanWithInput(PlanNode input) {
        this.input = input;
        if (input != null)
            input.setOutput(this);
    }

    public PlanNode getInput() {
        return input;
    }
    public void setInput(PlanNode input) {
        this.input = input;
        input.setOutput(this);
    }

    @Override
    public void replaceInput(PlanNode oldInput, PlanNode newInput) {
        if (input == oldInput) {
            input = newInput;
            input.setOutput(this);
        }
    }

    @Override
    public boolean accept(PlanVisitor v) {
        if (v.visitEnter(this)) {
            if (input != null)
                input.accept(v);
        }
        return v.visitLeave(this);
    }
    
    @Override
    protected void deepCopy(DuplicateMap map) {
        super.deepCopy(map);
        if (input != null)
            setInput((PlanNode)input.duplicate(map)); // Which takes care of setting input's output.
    }

}