com.bellman.bible.service.format.OSISInputStream.java Source code

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Here is the source code for com.bellman.bible.service.format.OSISInputStream.java

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package com.bellman.bible.service.format;

import com.bellman.bible.service.common.Logger;

import org.apache.commons.lang3.StringUtils;
import org.crosswire.jsword.book.Book;
import org.crosswire.jsword.book.BookException;
import org.crosswire.jsword.passage.Key;

import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;

/** Read through the raw OSIS input from a bible, add verse tags if required, remove any extra div tags,
 * and pipe back as in InputStream ready to be fed to the SAXParser for html formatting.
 * This is more efficient than using JDom to create a DOM and then streaming the DOM into a SAX parser  
 * 
 * @author Martin Denham [mjdenham at gmail dot com]
 * @see gnu.lgpl.License for license details.
 *      The copyright to this program is held by it's author.
 */
public class OSISInputStream extends InputStream {
    // requested passage
    private Book book;
    @SuppressWarnings("unused")
    private Key key;

    // iterator
    private boolean isFirstVerse = true;
    private Iterator<Key> keyIterator;
    private boolean isClosingTagWritten = false;

    // allow avoidance of repeated text due to merged verses
    private String previousVerseRawText = "";

    // cache
    private byte[] verseBuffer;
    private int length = 0;
    private int next = 0;

    //todo get the proper ENTITY refs working rather than my simple 2 fixed entities
    //   private static final String DOC_START = "<!ENTITY % HTMLlat1 PUBLIC \"-//W3C//ENTITIES Latin 1 for XHTML//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent\">\n%HTMLlat1;\n<div>";
    private static final String DOC_START = "<!DOCTYPE div [<!ENTITY nbsp \"&#160;\"><!ENTITY copy \"&#169;\">]><div>";
    private static final String DOC_END = "</div>";

    private OSISVerseTidy osisVerseTidy;

    private static String TAG = "OSISInputStream";

    private static Logger log = new Logger(TAG);

    /** Constructor to create an input stream from raw OSIS input
     * @param book
     * @param key
     */
    public OSISInputStream(Book book, Key key) {
        this.book = book;
        this.key = key;
        osisVerseTidy = new OSISVerseTidy(book);
        keyIterator = key.iterator();
    }

    /* (non-Javadoc)
     * @see java.io.InputStream#read()
     */
    @Override
    public int read() throws IOException {
        if (available() > 0) {
            return verseBuffer[next++];
        }
        return -1;
    }

    /* (non-Javadoc)
     * @see java.io.InputStream#available()
     */
    @Override
    public int available() throws IOException {
        if (next >= length) {
            loadNextVerse();
        }
        return length - next;
    }

    /* (non-Javadoc)
     * @see java.io.InputStream#read(byte[], int, int)
     */
    @Override
    public int read(byte[] b, int bOffset, int lenToRead) throws IOException {
        if (b == null) {
            throw new NullPointerException();
        } else if ((bOffset < 0) || (bOffset > b.length) || (lenToRead < 0) || ((bOffset + lenToRead) > b.length)
                || ((bOffset + lenToRead) < 0)) {
            throw new IndexOutOfBoundsException();
        } else if (lenToRead == 0) {
            return 0;
        }

        int available = available();
        // have we reached the end of the chapter
        if (available == 0) {
            return -1;
        }

        int lenActuallyCopied = Math.min(available, lenToRead);

        System.arraycopy(verseBuffer, next, b, bOffset, lenActuallyCopied);
        next += lenActuallyCopied;
        return lenActuallyCopied;
    }

    /** load the next verse, or opening or closing <div> into the verse buffer
     * 
     * @throws UnsupportedEncodingException
     */
    private void loadNextVerse() throws UnsupportedEncodingException {
        try {
            if (isFirstVerse) {
                putInVerseBuffer(DOC_START);
                isFirstVerse = false;
                return;
            }

            boolean isNextVerseLoaded = false;
            while (keyIterator.hasNext() && !isNextVerseLoaded) {
                Key currentVerse = keyIterator.next();
                //get the actual verse text and tidy it up, 
                String rawText = book.getRawText(currentVerse);

                // do not output empty verses (commonly verse 0 is empty)
                if (!StringUtils.isWhitespace(rawText)) {

                    // merged verses can cause duplicates so if dup then skip immediately to next verse
                    if (!previousVerseRawText.equals(rawText)) {
                        String tidyText = osisVerseTidy.tidy(currentVerse, rawText);
                        putInVerseBuffer(tidyText);
                        previousVerseRawText = rawText;
                        isNextVerseLoaded = true;
                        return;
                    } else {
                        log.debug("Duplicate verse:" + currentVerse);
                    }

                } else {
                    log.debug("Empty or missing verse:" + currentVerse);
                }
            }

            if (!isClosingTagWritten) {
                putInVerseBuffer(DOC_END);
                isClosingTagWritten = true;
            }
        } catch (UnsupportedEncodingException usc) {
            usc.printStackTrace();
        } catch (BookException be) {
            be.printStackTrace();
        }
    }

    /** put the text into the verse buffer ready to be fed into the stream
     * 
     * @param text
     * @throws UnsupportedEncodingException
     */
    private void putInVerseBuffer(String text) throws UnsupportedEncodingException {
        //      log.debug(text);
        verseBuffer = text.getBytes("UTF-8");
        length = verseBuffer.length;
        next = 0;
    }
}