// Custom InputStream implementation
        final InputStream customStream = new InputStream() {
            @Override
            public int read() {
                return -1;
            }
        };
        extractor.testValidateInputStream(customStream);
    }

    /**
     * Test exception message format for null input stream.
     */

            assertEquals("The inputstream is null.", e.getMessage());
        }
    }

    /**
     * Test that extraction error includes encoding information in the error message.
     */
    public void test_getText_extractionError_includesEncodingInMessage() {
        // Create a stream that will cause an error during reading
        final InputStream errorStream = new InputStream() {
            @Override

        } catch (final CrawlerSystemException e) {
            assertEquals("The inputstream is null.", e.getMessage());
        }
    }

    /**
     * Test extraction with filename containing special characters.
     */
    public void test_getText_withSpecialCharactersInFilename() {
        final InputStream in = new ByteArrayInputStream(new byte[0]);
        final Map<String, String> params = new HashMap<>();

    /**
     * Constructs a new IgnoreCloseInputStream that wraps the specified input stream.
     *
     * @param inputStream the input stream to wrap
     */
    public IgnoreCloseInputStream(final InputStream inputStream) {
        this.inputStream = inputStream;
    }

    /**
     * Overrides the close method to ignore the close operation.
     * The underlying input stream will not be closed.
     *

        }
    }

    /**
     * Test that try-with-resources handles null InputStream correctly.
     * Verifies that null InputStream doesn't cause NullPointerException during close.
     */
    @Test
    public void testTryWithResources_nullInputStreamSafety() {
        // This test demonstrates that try-with-resources handles null safely
        try (InputStream is = null) {
            if (is == null) {

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.crawler.helper;

import java.io.InputStream;

import org.codelibs.core.io.CloseableUtil;
import org.codelibs.fess.crawler.container.StandardCrawlerContainer;
import org.codelibs.fess.crawler.entity.RobotsTxt;
import org.dbflute.utflute.core.PlainTestCase;

        }
    }

    /**
     * Helper method to create a trackable input stream that records when it's closed.
     */
    private InputStream createTrackableInputStream(final InputStream originalStream, final AtomicBoolean closedFlag) {
        return new InputStream() {
            @Override
            public int read() throws IOException {
                return originalStream.read();
            }

package org.codelibs.fess.crawler.processor.impl;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.when;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.fess.crawler.container.CrawlerContainer;

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.crawler.extractor.impl;

import java.io.InputStream;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.io.CloseableUtil;
import org.codelibs.core.io.ResourceUtil;

 * try (ContentCache cache = new ContentCache(data)) {
 *     InputStream inputStream = cache.getInputStream();
 *     // Read from inputStream
 * }
 *
 * // File-based caching
 * File file = new File("example.txt");
 * try (ContentCache cache = new ContentCache(file)) {
 *     InputStream inputStream = cache.getInputStream();
 *     // Read from inputStream
 * }
 * }
 * </pre>
 *
 */