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This nifi-utils module should be a general purpose place to store widely and generally useful functions that any component might want to leverage. NO DEPENDENCIES should be added. This module is likely to be leveraged by every extension and should not bring along any other dependencies. The only dependency intended is the nifi-api and even this is expected to be already provided in any case where it would be used. The typical place this util would be found is within a nar and all nars already have nifi-api as a parent dependency. The nifi-api can be thought of as a NiFi Application Container level dependency.

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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.nifi.stream.io;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Wraps and InputStream so that the underlying InputStream cannot be closed. This is used so that the InputStream can be wrapped with yet another InputStream and prevent the outer layer from closing
 * the inner InputStream
 */
public class NonCloseableInputStream extends FilterInputStream {

    private final InputStream toWrap;

    public NonCloseableInputStream(final InputStream toWrap) {
        super(toWrap);
        this.toWrap = toWrap;
    }

    @Override
    public int read() throws IOException {
        return toWrap.read();
    }

    @Override
    public int read(byte[] b) throws IOException {
        return toWrap.read(b);
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        return toWrap.read(b, off, len);
    }

    @Override
    public void close() throws IOException {
        // do nothing
    }
}