* extract additional metadata, or perform other transformations during the
 * indexing process.
 *
 * Ingesters are processed in priority order, with lower numbers having higher priority.
 */
public abstract class Ingester {

    /** Priority of this ingester (lower numbers = higher priority) */
    protected int priority = 99;

    /**
     * Default constructor.
     */
    public Ingester() {

import org.codelibs.core.lang.StringUtil;

/**
 * Converter for numbers.
 *
 * @author higa
 */
public class NumberConverter implements Converter {

    /**
     * The pattern for numbers.
     */
    protected String pattern;

    /**
     * Constructs an instance.
     *
     * @param pattern
     *            the pattern for numbers
     */
    public NumberConverter(final String pattern) {

    }

    /**
     * Sets the current page number to display.
     *
     * @param currentPageNumber current page number
     */
    public void setCurrentPageNumber(final int currentPageNumber) {
        this.currentPageNumber = currentPageNumber;
    }

    /**
     * Gets the list of page numbers for pagination navigation.
     *
     * @return list of page numbers
     */

    }

    /**
     * Sets the current page number.
     *
     * @param currentPageNumber the current page number
     */
    public void setCurrentPageNumber(final int currentPageNumber) {
        this.currentPageNumber = currentPageNumber;
    }

    /**
     * Gets the list of page numbers for pagination display.
     *
     * @return the list of page numbers
     */

    }

    /**
     * Sets the list of page numbers for pagination navigation.
     *
     * @param pageNumberList the list of page numbers to set
     */
    public void setPageNumberList(final List<Integer> pageNumberList) {
        this.pageNumberList = pageNumberList;
    }

    /**
     * Gets the default current page number from system constants.
     *

    }

    /**
     * Gets the list of page numbers.
     * @return The list of page numbers.
     */
    public List<Integer> getPageNumberList() {
        return pageNumberList;
    }

    /**
     * Sets the list of page numbers.
     * @param pageNumberList The list of page numbers.
     */
    public void setPageNumberList(final List<Integer> pageNumberList) {

    }

    /**
     * Gets the list of page numbers for navigation.
     *
     * @return A list of page numbers.
     */
    public List<Integer> getPageNumberList() {
        return pageNumberList;
    }

    /**
     * Sets the list of page numbers for navigation.
     *
     * @param pageNumberList A list of page numbers.
     */

    }

    /**
     * Gets the list of page numbers for pagination navigation.
     * @return The list of page numbers.
     */
    public List<Integer> getPageNumberList() {
        return pageNumberList;
    }

    /**
     * Sets the list of page numbers for pagination navigation.
     * @param pageNumberList The list of page numbers.
     */

    /**
     * Sets the current page number being displayed.
     *
     * @param currentPageNumber the current page number
     */
    public void setCurrentPageNumber(final int currentPageNumber) {
        this.currentPageNumber = currentPageNumber;
    }

    /**
     * Gets the list of page numbers for pagination navigation.
     *
     * @return the list of page numbers
     */

    Optional<Integer> optionalInt = getSomeOptionalInt();
    // Number value = optionalInt.or(0.5); // error
  }

  @SuppressWarnings("unused") // compilation test
  public void testSampleCodeError2() {
    FluentIterable<? extends Number> numbers = getSomeNumbers();
    Optional<? extends Number> first = numbers.first();
    // Number value = first.or(0.5); // error
  }

  @SuppressWarnings("unused") // compilation test