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univocity's open source parsers for processing different text formats using a consistent API
/*******************************************************************************
* Copyright 2014 Univocity Software Pty Ltd
*
* 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.univocity.parsers.common.processor.core;
import com.univocity.parsers.common.*;
import java.util.*;
/**
* A common interface for {@link Processor}s that collect the values parsed from each column in a row.
* Namely: {@link AbstractColumnProcessor}, {@link AbstractObjectColumnProcessor}, {@link AbstractBatchedColumnProcessor} and {@link AbstractBatchedObjectColumnProcessor}.
*
* @see AbstractColumnProcessor
* @see AbstractObjectColumnProcessor
* @see AbstractBatchedColumnProcessor
* @see AbstractBatchedObjectColumnProcessor
* @see Processor
*
* @author Univocity Software Pty Ltd - [email protected]
*
* @param the type of the data stored by the columns.
*/
interface ColumnReader {
/**
* Returns the column headers. This can be either the headers defined in {@link CommonSettings#getHeaders()} or the headers parsed in
* the input when {@link CommonSettings#getHeaders()} equals to {@code true}
* @return the headers of all column parsed.
*/
String[] getHeaders();
/**
* Returns the values processed for each column
* @return a list of lists. The stored lists correspond to the position of the column processed from the input; Each list
* contains the corresponding values parsed for a column, across multiple rows.
*/
List> getColumnValuesAsList();
/**
* Fills a given map associating each column name to its list o values
* @param map the map to hold the values of each column
* @throws IllegalArgumentException if a column does not have a name associated to it. In this case, use {@link #putColumnValuesInMapOfIndexes(Map)} instead.
*/
void putColumnValuesInMapOfNames(Map> map);
/**
* Fills a given map associating each column index to its list of values
* @param map the map to hold the values of each column
*/
void putColumnValuesInMapOfIndexes(Map> map);
/**
* Returns a map of column names and their respective list of values parsed from the input.
* @return a map of column names and their respective list of values.
*/
Map> getColumnValuesAsMapOfNames();
/**
* Returns a map of column indexes and their respective list of values parsed from the input.
* @return a map of column indexes and their respective list of values.
*/
Map> getColumnValuesAsMapOfIndexes();
/**
* Returns the values of a given column.
* @param columnName the name of the column in the input.
* @return a list with all data stored in the given column
*/
List getColumn(String columnName);
/**
* Returns the values of a given column.
* @param columnIndex the position of the column in the input (0-based).
* @return a list with all data stored in the given column
*/
List getColumn(int columnIndex);
}