phoenix-core/src/main/java/org/apache/phoenix/parse/ConcreteTableNode.java

/*
 * 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.phoenix.parse;

import org.apache.phoenix.util.SchemaUtil;

/**
 * 
 * Abstract node representing a table reference in the FROM clause in SQL
 *
 * 
 * @since 0.1
 */
public abstract class ConcreteTableNode extends TableNode {
	//DEFAULT_TABLE_SAMPLING_RATE alternative is to set as 100d
	public static final Double DEFAULT_TABLE_SAMPLING_RATE=null;
    private final TableName name;
    private final Double tableSamplingRate;
    
    ConcreteTableNode(String alias, TableName name) {
    	this(alias,name,DEFAULT_TABLE_SAMPLING_RATE);
    }
    
    ConcreteTableNode(String alias, TableName name, Double tableSamplingRate) {
        super(SchemaUtil.normalizeIdentifier(alias));
        this.name = name;
        if(tableSamplingRate==null){
        	this.tableSamplingRate=DEFAULT_TABLE_SAMPLING_RATE;
        }else if(tableSamplingRate<0d||tableSamplingRate>100d){
        	throw new IllegalArgumentException("TableSamplingRate is out of bound of 0 and 100");
        }else{
        	this.tableSamplingRate=tableSamplingRate;
        }
    }

    public TableName getName() {
        return name;
    }
    
    public Double getTableSamplingRate(){
    	return tableSamplingRate;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result + ((tableSamplingRate == null) ? 0 : tableSamplingRate.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null) return false;
        if (getClass() != obj.getClass()) return false;
        ConcreteTableNode other = (ConcreteTableNode)obj;
        if (name == null) {
            if (other.name != null) return false;
        } else if (!name.equals(other.name)) return false;
        if (tableSamplingRate == null) {
            if (other.tableSamplingRate != null) return false;
        } else if (!tableSamplingRate.equals(other.tableSamplingRate)) return false;
        return true;
    }
}