/*
 * 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 java.sql.SQLException;
import java.util.Collections;
import java.util.List;

import org.apache.phoenix.compile.ColumnResolver;

import org.apache.phoenix.thirdparty.com.google.common.collect.ImmutableList;

/**
 * Node representing an explicit table reference in the FROM clause of SQL
 * 
 * 
 * @since 0.1
 */
public class NamedTableNode extends ConcreteTableNode {

    private final List<ColumnDef> dynColumns;
    
    public static NamedTableNode create (String alias, TableName name, List<ColumnDef> dynColumns) {
        return new NamedTableNode(alias, name, dynColumns);
    }
    
    public static NamedTableNode create (TableName name) {
        return new NamedTableNode(null, name, Collections.<ColumnDef>emptyList());
    }
    
    public static NamedTableNode create (String schemaName, String tableName) {
        return new NamedTableNode(null, TableName.create(schemaName, tableName), Collections.<ColumnDef>emptyList());
    }
    
    @Deprecated
    NamedTableNode(String alias, TableName name) {
        this(alias, name, ConcreteTableNode.DEFAULT_TABLE_SAMPLING_RATE);
    }
    
    @Deprecated
    NamedTableNode(String alias, TableName name, List<ColumnDef> dynColumns) {
    	this(alias,name,dynColumns,ConcreteTableNode.DEFAULT_TABLE_SAMPLING_RATE);
    }
    
    NamedTableNode(String alias, TableName name, Double tableSamplingRate) {
    	super(alias, name, tableSamplingRate);
        dynColumns = Collections.<ColumnDef> emptyList();
    }
    
    NamedTableNode(String alias, TableName name, List<ColumnDef> dynColumns, Double tableSamplingRate) {
        super(alias, name, tableSamplingRate);
        if (dynColumns != null) {
            this.dynColumns = ImmutableList.copyOf(dynColumns);
        } else {
            this.dynColumns = Collections.<ColumnDef> emptyList();
        }
    }

    @Override
    public <T> T accept(TableNodeVisitor<T> visitor) throws SQLException {
        return visitor.visit(this);
    }

    public List<ColumnDef> getDynamicColumns() {
        return dynColumns;
    }
    
    @Override
    public void toSQL(ColumnResolver resolver, StringBuilder buf) {
        buf.append(this.getName().toString());
        if (!dynColumns.isEmpty()) {
            buf.append('(');
            for (ColumnDef def : dynColumns) {
                buf.append(def.toFullString());
                buf.append(',');
            }
            buf.setLength(buf.length()-1);
            buf.append(')');
        }
        if (this.getAlias() != null) buf.append(" " + this.getAlias());
        if (this.getTableSamplingRate() != null) buf.append(" TABLESAMPLE " + this.getTableSamplingRate());
        buf.append(' ');
    }

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

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