org.apache.pig.impl.logicalLayer.LONot Maven / Gradle / Ivy

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/* 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.pig.impl.logicalLayer;

import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.plan.PlanVisitor;
import org.apache.pig.impl.plan.VisitorException;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.data.DataType;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class LONot extends UnaryExpressionOperator {

    private static final long serialVersionUID = 2L;
    private static Log log = LogFactory.getLog(LONot.class);

    /**
     * 
     * @param plan
     *            Logical plan this operator is a part of.
     * @param k
     *            Operator key to assign to this node.
     */
    public LONot(LogicalPlan plan, OperatorKey k) {
        super(plan, k);
    }
    
    @Override
    public Schema getSchema() {
        return mSchema;
    }

    @Override
    public Schema.FieldSchema getFieldSchema() throws FrontendException {
        if(!mIsFieldSchemaComputed) {
            mFieldSchema = new Schema.FieldSchema(null, DataType.BOOLEAN);
            mFieldSchema.setParent(getOperand().getFieldSchema().canonicalName, getOperand());
            mIsFieldSchemaComputed = true;
        }
        return mFieldSchema;
    }

    @Override
    public void visit(LOVisitor v) throws VisitorException {
        v.visit(this);
    }

    @Override
    public String name() {
        return "Not " + mKey.scope + "-" + mKey.id;
    }
}