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/*******************************************************************************
* 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.fields;
import java.util.*;
/**
* A FieldSelector capable of deselecting fields by their position in a record.
*
* This selector stores undesired fields and will return the indexes of those fields that are not part of the selection.
*
* @see FieldSelector
* @see FieldSet
*
* @author uniVocity Software Pty Ltd - [email protected]
*
*/
public class ExcludeFieldIndexSelector extends FieldSet implements FieldSelector {
/**
* Returns the indexes of any that are part of a sequence of headers but not part of the selection.
* @param columns the sequence of headers that might have some elements selected by this FieldSelector
* @return the positions of all elements which were not selected.
*/
@Override
public int[] getFieldIndexes(String[] columns) {
if(columns == null){
return null;
}
Set chosenFields = new HashSet(this.get());
for (Integer chosenIndex : chosenFields) {
if (chosenIndex >= columns.length || chosenIndex < 0) {
throw new IndexOutOfBoundsException("Exclusion index '" + chosenIndex + "' is out of bounds. It must be between '0' and '" + (columns.length - 1) + '\'');
}
}
int[] out = new int[columns.length - chosenFields.size()];
int j = 0;
for (int i = 0; i < columns.length; i++) {
if (!chosenFields.contains(i)) {
out[j++] = i;
}
}
return out;
}
@Override
public String describe() {
return "undesired " + super.describe();
}
}