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package de.lmu.ifi.dbs.elki.datasource.bundle;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.ArrayList;
import java.util.List;
import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.utilities.exceptions.AbortException;
/**
* This class represents a set of "packaged" objects, which is a transfer
* container for objects e.g. from parsers to a database. It contains the object
* with multiple representations outside of any index structure.
*
* @author Erich Schubert
*/
public class MultipleObjectsBundle implements ObjectBundle {
/**
* Storing the meta data.
*/
private BundleMeta meta;
/**
* Storing the real contents.
*/
private List<List<?>> columns;
/**
* Constructor.
*/
public MultipleObjectsBundle() {
this.meta = new BundleMeta();
this.columns = new ArrayList<List<?>>();
}
/**
* Constructor.
*
* @param meta Meta data contained.
* @param columns Content in columns
*/
@Deprecated
public MultipleObjectsBundle(BundleMeta meta, List<List<?>> columns) {
super();
this.meta = meta;
this.columns = columns;
if(this.columns.size() != this.meta.size()) {
throw new AbortException("Meta size and columns do not agree!");
}
int len = -1;
for(List<?> col : columns) {
if(len < 0) {
len = col.size();
}
else {
if(col.size() != len) {
throw new AbortException("Column lengths do not agree.");
}
}
}
}
@Override
public BundleMeta meta() {
return meta;
}
@Override
public SimpleTypeInformation<?> meta(int i) {
return meta.get(i);
}
@Override
public int metaLength() {
return meta.size();
}
@Override
public Object data(int onum, int rnum) {
if(rnum < 0 || rnum >= meta.size()) {
throw new ArrayIndexOutOfBoundsException();
}
return columns.get(rnum).get(onum);
}
@Override
public int dataLength() {
try {
return columns.get(0).size();
}
catch(IndexOutOfBoundsException e) {
return 0;
}
}
/**
* Append a new record to the data set. Pay attention to having the right
* number of values!
*
* @param data Data to append
*/
public void appendSimple(Object... data) {
if(data.length != meta.size()) {
throw new AbortException("Invalid number of attributes in 'append'.");
}
for(int i = 0; i < data.length; i++) {
@SuppressWarnings("unchecked")
final List<Object> col = (List<Object>) columns.get(i);
col.add(data[i]);
}
}
/**
* Helper to add a single column to the bundle.
*
* @param type Type information
* @param data Data to add
* @return This object, for chaining.
*/
public MultipleObjectsBundle appendColumn(SimpleTypeInformation<?> type, List<?> data) {
meta.add(type);
columns.add(data);
return this;
}
/**
* Get the raw objects columns. Use with caution!
*
* @param i column number
* @return the ith column
*/
public List<?> getColumn(int i) {
return columns.get(i);
}
/**
* Helper to add a single column to the bundle.
*
* @param <V> Object type
* @param type Type information
* @param data Data to add
*/
public static <V> MultipleObjectsBundle makeSimple(SimpleTypeInformation<? super V> type, List<? extends V> data) {
MultipleObjectsBundle bundle = new MultipleObjectsBundle();
bundle.appendColumn(type, data);
return bundle;
}
/**
* Helper to add a single column to the bundle.
*
* @param <V1> First Object type
* @param <V2> Second Object type
* @param type1 Type information
* @param data1 Data column to add
* @param type2 Second Type information
* @param data2 Second data column to add
*/
public static <V1, V2> MultipleObjectsBundle makeSimple(SimpleTypeInformation<? super V1> type1, List<? extends V1> data1, SimpleTypeInformation<? super V2> type2, List<? extends V2> data2) {
MultipleObjectsBundle bundle = new MultipleObjectsBundle();
bundle.appendColumn(type1, data1);
bundle.appendColumn(type2, data2);
return bundle;
}
/**
* Helper to add a single column to the bundle.
*
* @param <V1> First Object type
* @param <V2> Second Object type
* @param <V3> Third Object type
* @param type1 First type information
* @param data1 First data column to add
* @param type2 Second type information
* @param data2 Second data column to add
* @param type3 Third type information
* @param data3 Third data column to add
*/
public static <V1, V2, V3> MultipleObjectsBundle makeSimple(SimpleTypeInformation<? super V1> type1, List<? extends V1> data1, SimpleTypeInformation<? super V2> type2, List<? extends V2> data2, SimpleTypeInformation<? super V3> type3, List<? extends V3> data3) {
MultipleObjectsBundle bundle = new MultipleObjectsBundle();
bundle.appendColumn(type1, data1);
bundle.appendColumn(type2, data2);
bundle.appendColumn(type3, data3);
return bundle;
}
/**
* Get an object row.
*
* @param row Row number
* @return Array of values
*/
public Object[] getRow(int row) {
Object[] ret = new Object[columns.size()];
for(int c = 0; c < columns.size(); c++) {
ret[c] = data(row, c);
}
return ret;
}
}
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