/**
* AnalyzerBeans
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.eobjects.analyzer.beans.datastructures;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.inject.Inject;
import org.eobjects.analyzer.beans.api.Categorized;
import org.eobjects.analyzer.beans.api.Configured;
import org.eobjects.analyzer.beans.api.Description;
import org.eobjects.analyzer.beans.api.OutputColumns;
import org.eobjects.analyzer.beans.api.Transformer;
import org.eobjects.analyzer.beans.api.TransformerBean;
import org.eobjects.analyzer.beans.categories.DataStructuresCategory;
import org.eobjects.analyzer.data.InputColumn;
import org.eobjects.analyzer.data.InputRow;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Transformer for building lists based on values in a row.
*/
@TransformerBean("Build list")
@Description("Build a list containing a variable amount of elements. Adds the capability to save multiple values in a single field.")
@Categorized(DataStructuresCategory.class)
public class BuildListTransformer implements Transformer<List<?>> {
private static final Logger logger = LoggerFactory
.getLogger(BuildMapTransformer.class);
@Inject
@Configured
InputColumn<?>[] values;
@Inject
@Configured
boolean includeNullValues;
@Inject
@Configured(required = false)
@Description("Add elements to this (optional) existing list")
InputColumn<List<Object>> addToExistingList;
public void setIncludeNullValues(boolean includeNullValues) {
this.includeNullValues = includeNullValues;
}
public void setValues(InputColumn<?>[] values) {
this.values = values;
}
@Override
public OutputColumns getOutputColumns() {
StringBuilder sb = new StringBuilder("List: ");
for (int i = 0; i < values.length; i++) {
String key = values[i].getName();
sb.append(key);
if (sb.length() > 30) {
sb.append("...");
break;
}
if (i + 1 < values.length) {
sb.append(",");
}
}
OutputColumns outputColumns = new OutputColumns(
new String[] { sb.toString() }, new Class[] { List.class });
return outputColumns;
}
@Override
public List<?>[] transform(InputRow row) {
final List<Object> existingList;
if (addToExistingList != null) {
existingList = row.getValue(addToExistingList);
} else {
existingList = Collections.emptyList();
}
final List<Object> list = new ArrayList<Object>(existingList);
for (InputColumn<?> column : values) {
final Object value = row.getValue(column);
if (!includeNullValues && value == null) {
logger.debug("Ignoring null value for {} in row: {}",
column.getName(), row);
} else {
list.add(value);
}
}
final List<?>[] result = new List[] { list };
return result;
}
}