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/*
* 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.commons.io.input;
import java.io.Reader;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.function.IntPredicate;
/**
* A filter reader that removes a given set of characters represented as {@code int} code points, handy to remove known
* junk characters from CSV files for example.
* <p>
* This class must convert each {@code int} read to an {@link Integer}. You can increase the Integer cache with a system
* property, see {@link Integer}.
* </p>
*/
public class CharacterSetFilterReader extends AbstractCharacterFilterReader {
private static IntPredicate toIntPredicate(final Set<Integer> skip) {
if (skip == null) {
return SKIP_NONE;
}
final Set<Integer> unmodifiableSet = Collections.unmodifiableSet(skip);
return c -> unmodifiableSet.contains(Integer.valueOf(c));
}
/**
* Constructs a new reader.
*
* @param reader the reader to filter.
* @param skip the set of characters to filter out.
* @since 2.9.0
*/
public CharacterSetFilterReader(final Reader reader, final Integer... skip) {
this(reader, new HashSet<>(Arrays.asList(skip)));
}
/**
* Constructs a new reader.
*
* @param reader the reader to filter.
* @param skip the set of characters to filter out.
*/
public CharacterSetFilterReader(final Reader reader, final Set<Integer> skip) {
super(reader, toIntPredicate(skip));
}
}
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