JDK14/Java14源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package java.awt.print;

import java.util.Vector;

/**
 * The {@code Book} class provides a representation of a document in
 * which pages may have different page formats and page painters. This
 * class uses the {@link Pageable} interface to interact with a
 * {@link PrinterJob}.
 * @see Pageable
 * @see PrinterJob
*/

public class Book implements Pageable {

 /* Class Constants */

 /* Class Variables */

 /* Instance Variables */

    /**
     * The set of pages that make up the Book.
     */
    private Vector<BookPage> mPages;

 /* Instance Methods */

    /**
     *  Creates a new, empty {@code Book}.
     */
    public Book() {
        mPages = new Vector<>();
    }

    /**
     * Returns the number of pages in this {@code Book}.
     * @return the number of pages this {@code Book} contains.
     */
    public int getNumberOfPages(){
        return mPages.size();
    }

    /**
     * Returns the {@link PageFormat} of the page specified by
     * {@code pageIndex}.
     * @param pageIndex the zero based index of the page whose
     *            {@code PageFormat} is being requested
     * @return the {@code PageFormat} describing the size and
     *          orientation of the page.
     * @throws IndexOutOfBoundsException if the {@code Pageable}
     *          does not contain the requested page
     */
    public PageFormat getPageFormat(int pageIndex)
        throws IndexOutOfBoundsException
    {
        return getPage(pageIndex).getPageFormat();
    }

    /**
     * Returns the {@link Printable} instance responsible for rendering
     * the page specified by {@code pageIndex}.
     * @param pageIndex the zero based index of the page whose
     *                  {@code Printable} is being requested
     * @return the {@code Printable} that renders the page.
     * @throws IndexOutOfBoundsException if the {@code Pageable}
     *            does not contain the requested page
     */
    public Printable getPrintable(int pageIndex)
        throws IndexOutOfBoundsException
    {
        return getPage(pageIndex).getPrintable();
    }

    /**
     * Sets the {@code PageFormat} and the {@code Painter} for a
     * specified page number.
     * @param pageIndex the zero based index of the page whose
     *                  painter and format is altered
     * @param painter   the {@code Printable} instance that
     *                  renders the page
     * @param page      the size and orientation of the page
     * @throws IndexOutOfBoundsException if the specified
     *          page is not already in this {@code Book}
     * @throws NullPointerException if the {@code painter} or
     *          {@code page} argument is {@code null}
     */
    public void setPage(int pageIndex, Printable painter, PageFormat page)
        throws IndexOutOfBoundsException
    {
        if (painter == null) {
            throw new NullPointerException("painter is null");
        }

        if (page == null) {
            throw new NullPointerException("page is null");
        }

        mPages.setElementAt(new BookPage(painter, page), pageIndex);
    }

    /**
     * Appends a single page to the end of this {@code Book}.
     * @param painter   the {@code Printable} instance that
     *                  renders the page
     * @param page      the size and orientation of the page
     * @throws NullPointerException
     *          If the {@code painter} or {@code page}
     *          argument is {@code null}
     */
    public void append(Printable painter, PageFormat page) {
        mPages.addElement(new BookPage(painter, page));
    }

    /**
     * Appends {@code numPages} pages to the end of this
     * {@code Book}.  Each of the pages is associated with
     * {@code page}.
     * @param painter   the {@code Printable} instance that renders
     *                  the page
     * @param page      the size and orientation of the page
     * @param numPages  the number of pages to be added to the
     *                  this {@code Book}.
     * @throws NullPointerException
     *          If the {@code painter} or {@code page}
     *          argument is {@code null}
     */
    public void append(Printable painter, PageFormat page, int numPages) {
        BookPage bookPage = new BookPage(painter, page);
        int pageIndex = mPages.size();
        int newSize = pageIndex + numPages;

        mPages.setSize(newSize);
        for(int i = pageIndex; i < newSize; i++){
            mPages.setElementAt(bookPage, i);
        }
    }

    /**
     * Return the BookPage for the page specified by 'pageIndex'.
     */
    private BookPage getPage(int pageIndex)
        throws ArrayIndexOutOfBoundsException
    {
        return mPages.elementAt(pageIndex);
    }

    /**
     * The BookPage inner class describes an individual
     * page in a Book through a PageFormat-Printable pair.
     */
    private class BookPage {
        /**
         *  The size and orientation of the page.
         */
        private PageFormat mFormat;

        /**
         * The instance that will draw the page.
         */
        private Printable mPainter;

        /**
         * A new instance where 'format' describes the page's
         * size and orientation and 'painter' is the instance
         * that will draw the page's graphics.

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