| // 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.impala.catalog; |
| |
| import java.util.Map; |
| |
| import org.apache.hadoop.hive.metastore.api.StorageDescriptor; |
| |
| import org.apache.impala.analysis.StringLiteral; |
| import org.apache.impala.thrift.TTableRowFormat; |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Defines the physical (on-disk) format for a table's data. This is used when creating |
| * a new table to specify how to interpret the fields (columns) and lines (rows) in a |
| * a data file. |
| */ |
| public class RowFormat { |
| // Default row format |
| public final static RowFormat DEFAULT_ROW_FORMAT = new RowFormat(null, null, null); |
| |
| private final String fieldDelimiter_; |
| private final String lineDelimiter_; |
| private final String escapeChar_; |
| |
| private RowFormat(String fieldDelimiter, String lineDelimiter, String escapeChar, |
| boolean unescape) { |
| if (unescape) { |
| fieldDelimiter_ = getUnescapedValueOrNull(fieldDelimiter); |
| lineDelimiter_ = getUnescapedValueOrNull(lineDelimiter); |
| escapeChar_ = getUnescapedValueOrNull(escapeChar); |
| } else { |
| fieldDelimiter_ = fieldDelimiter; |
| lineDelimiter_ = lineDelimiter; |
| escapeChar_ = escapeChar; |
| } |
| } |
| |
| /** |
| * Creates a new instance of the RowFormat class, unescaping the values of |
| * field delimiter, line delimiter, and escape char. |
| */ |
| public RowFormat(String fieldDelimiter, String lineDelimiter, String escapeChar) { |
| this(fieldDelimiter, lineDelimiter, escapeChar, true); |
| } |
| |
| public String getFieldDelimiter() { |
| return fieldDelimiter_; |
| } |
| |
| public String getLineDelimiter() { |
| return lineDelimiter_; |
| } |
| |
| public String getEscapeChar() { |
| return escapeChar_; |
| } |
| |
| public boolean isDefault() { |
| return fieldDelimiter_ == null && lineDelimiter_ == null && escapeChar_ == null; |
| } |
| |
| private static String getUnescapedValueOrNull(String value) { |
| return value == null ? null : new StringLiteral(value).getUnescapedValue(); |
| } |
| |
| public TTableRowFormat toThrift() { |
| TTableRowFormat tableRowFormat = new TTableRowFormat(); |
| tableRowFormat.setField_terminator(getFieldDelimiter()); |
| tableRowFormat.setLine_terminator(getLineDelimiter()); |
| tableRowFormat.setEscaped_by(getEscapeChar()); |
| return tableRowFormat; |
| } |
| |
| public static RowFormat fromThrift(TTableRowFormat tableRowFormat) { |
| if (tableRowFormat == null) { |
| return RowFormat.DEFAULT_ROW_FORMAT; |
| } |
| // When creating a RowFormat from thrift, don't unescape the values, they should have |
| // already been unescaped. |
| return new RowFormat(tableRowFormat.getField_terminator(), |
| tableRowFormat.getLine_terminator(), tableRowFormat.getEscaped_by(), false); |
| } |
| |
| /** |
| * Returns the RowFormat for the storage descriptor. |
| */ |
| public static RowFormat fromStorageDescriptor(StorageDescriptor sd) { |
| Preconditions.checkNotNull(sd); |
| Map<String, String> params = sd.getSerdeInfo().getParameters(); |
| return new RowFormat(params.get("field.delim"), params.get("line.delim"), |
| params.get("escape.delim")); |
| } |
| } |