com.cloudera.impala.analysis.AlterTableRenameStmt.java Source code

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Here is the source code for com.cloudera.impala.analysis.AlterTableRenameStmt.java

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// Copyright 2012 Cloudera Inc.
//
// Licensed 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 com.cloudera.impala.analysis;

import com.cloudera.impala.common.AnalysisException;
import com.cloudera.impala.thrift.TAlterTableParams;
import com.cloudera.impala.thrift.TAlterTableRenameParams;
import com.cloudera.impala.thrift.TAlterTableType;
import com.cloudera.impala.thrift.TTableName;

import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;

import com.google.common.base.Preconditions;

/**
 * Represents an ALTER TABLE RENAME <table> statement.
 */
public class AlterTableRenameStmt extends AlterTableStmt {
    private final TableName newTableName;

    // Set during analysis
    private String dbName;

    public AlterTableRenameStmt(TableName oldTableName, TableName newTableName) {
        super(oldTableName);
        Preconditions.checkState(newTableName != null && !newTableName.isEmpty());
        this.newTableName = newTableName;
    }

    public String getNewTbl() {
        return newTableName.getTbl();
    }

    public String getNewDb() {
        Preconditions.checkNotNull(dbName);
        return dbName;
    }

    @Override
    public TAlterTableParams toThrift() {
        TAlterTableParams params = super.toThrift();
        params.setAlter_type(TAlterTableType.RENAME_TABLE);
        TAlterTableRenameParams renameParams = new TAlterTableRenameParams(new TTableName(getNewDb(), getNewTbl()));
        params.setRename_params(renameParams);
        return params;
    }

    @Override
    public void analyze(Analyzer analyzer) throws AnalysisException {
        super.analyze(analyzer);
        // If new new table name was not fully qualified, use the current default database.
        dbName = newTableName.isFullyQualified() ? newTableName.getDb() : analyzer.getDefaultDb();

        if (analyzer.getCatalog().getDb(dbName) == null) {
            throw new AnalysisException("Unknown database: " + dbName);
        }

        if (analyzer.getCatalog().containsTable(dbName, getNewTbl())) {
            throw new AnalysisException(String.format("Table already exists: %s.%s", dbName, getNewTbl()));
        }
    }
}