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/*
* $Id: DocWriter.java 3937 2009-05-27 12:56:48Z blowagie $
*
* Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.aowagie.text;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import com.aowagie.text.pdf.OutputStreamCounter;
/**
* An abstract Writer class for documents.
*
* DocWriter is the abstract class of several writers such
* as PdfWriter and HtmlWriter.
* A DocWriter can be added as a DocListener
* to a certain Document by getting an instance (see method
* getInstance() in the specific writer-classes).
* Every Element added to the original Document
* will be written to the OutputStream of the listening
* DocWriter.
*
* @see Document
* @see DocListener
*/
public abstract class DocWriter implements DocListener {
/** This is some byte that is often used. */
private static final byte SPACE = (byte)' ';
/** This is some byte that is often used. */
private static final byte EQUALS = (byte)'=';
/** This is some byte that is often used. */
private static final byte QUOTE = (byte)'\"';
/** This is some byte that is often used. */
private static final byte GT = (byte)'>';
/** This is some byte that is often used. */
private static final byte FORWARD = (byte)'/';
// membervariables
/** The outputstream of this writer. */
protected OutputStreamCounter os;
/** Is the writer open for writing? */
protected boolean open = false;
/** Do we have to pause all writing actions? */
private final boolean pause = false;
/** Closes the stream on document close */
private boolean closeStream = true;
// constructor
protected DocWriter() {
}
/**
* Constructs a DocWriter.
*
* @param document The Document that has to be written
* @param os The OutputStream the writer has to write to.
*/
protected DocWriter(final Document document, final OutputStream os) {
this.os = new OutputStreamCounter(new BufferedOutputStream(os));
}
// implementation of the DocListener methods
/**
* Signals that an Element was added to the Document.
*
* This method should be overridden in the specific DocWriter classes
* derived from this abstract class.
*
* @param element A high level object to add
* @return false
* @throws DocumentException when a document isn't open yet, or has been closed
*/
@Override
public boolean add(final Element element) throws DocumentException {
return false;
}
/**
* Signals that the Document was opened.
*/
@Override
public void open() {
this.open = true;
}
/**
* Sets the pagesize.
*
* @param pageSize the new pagesize
* @return a boolean
*/
@Override
public boolean setPageSize(final Rectangle pageSize) {
return true;
}
/**
* Sets the margins.
*
* This does nothing. Has to be overridden if needed.
*
* @param marginLeft the margin on the left
* @param marginRight the margin on the right
* @param marginTop the margin on the top
* @param marginBottom the margin on the bottom
* @return false
*/
@Override
public boolean setMargins(final float marginLeft, final float marginRight, final float marginTop, final float marginBottom) {
return false;
}
/**
* Signals that an new page has to be started.
*
* This does nothing. Has to be overridden if needed.
*
* @return true if the page was added, false if not.
*/
@Override
public boolean newPage() {
if (!this.open) {
return false;
}
return true;
}
/**
* Changes the header of this document.
*
* This method should be overridden in the specific DocWriter classes
* derived from this abstract class if they actually support the use of
* headers.
*
* @param header the new header
*/
@Override
public void setHeader(final HeaderFooter header) {
}
/**
* Resets the header of this document.
*
* This method should be overridden in the specific DocWriter classes
* derived from this abstract class if they actually support the use of
* headers.
*/
@Override
public void resetHeader() {
}
/**
* Changes the footer of this document.
*
* This method should be overridden in the specific DocWriter classes
* derived from this abstract class if they actually support the use of
* footers.
*
* @param footer the new footer
*/
@Override
public void setFooter(final HeaderFooter footer) {
}
/**
* Resets the footer of this document.
*
* This method should be overridden in the specific DocWriter classes
* derived from this abstract class if they actually support the use of
* footers.
*/
@Override
public void resetFooter() {
}
/**
* Sets the page number to 0.
*
* This method should be overridden in the specific DocWriter classes
* derived from this abstract class if they actually support the use of
* pagenumbers.
*/
@Override
public void resetPageCount() {
}
/**
* Sets the page number.
*
* This method should be overridden in the specific DocWriter classes
* derived from this abstract class if they actually support the use of
* pagenumbers.
*
* @param pageN the new page number
*/
@Override
public void setPageCount(final int pageN) {
}
/**
* Signals that the Document was closed and that no other
* Elements will be added.
*/
@Override
public void close() {
this.open = false;
try {
this.os.flush();
if (this.closeStream) {
this.os.close();
}
}
catch(final IOException ioe) {
throw new ExceptionConverter(ioe);
}
}
// methods
/** Converts a String into a Byte array
* according to the ISO-8859-1 codepage.
* @param text the text to be converted
* @return the conversion result
*/
public static final byte[] getISOBytes(final String text)
{
if (text == null) {
return null;
}
final int len = text.length();
final byte b[] = new byte[len];
for (int k = 0; k < len; ++k) {
b[k] = (byte)text.charAt(k);
}
return b;
}
/**
* Checks if writing is paused.
*
* @return true if writing temporarily has to be paused, false otherwise.
*/
public boolean isPaused() {
return this.pause;
}
/**
* Writes a String to the OutputStream.
*
* @param string the String to write
* @throws IOException
*/
private void write(final String string) throws IOException {
this.os.write(getISOBytes(string));
}
/**
* Writes a key-value pair to the outputstream.
*
* @param key the name of an attribute
* @param value the value of an attribute
* @throws IOException
*/
private void write(final String key, final String value)
throws IOException {
this.os.write(SPACE);
write(key);
this.os.write(EQUALS);
this.os.write(QUOTE);
write(value);
this.os.write(QUOTE);
}
/** Checks if the stream is to be closed on document close
* @return true if the stream is closed on document close
*
*/
public boolean isCloseStream() {
return this.closeStream;
}
/** Sets the close state of the stream after document close
* @param closeStream true if the stream is closed on document close
*
*/
public void setCloseStream(final boolean closeStream) {
this.closeStream = closeStream;
}
/**
* @see com.aowagie.text.DocListener#setMarginMirroring(boolean)
*/
@Override
public boolean setMarginMirroring(final boolean MarginMirroring) {
return false;
}
/**
* @see com.aowagie.text.DocListener#setMarginMirroring(boolean)
* @since 2.1.6
*/
@Override
public boolean setMarginMirroringTopBottom(final boolean MarginMirroring) {
return false;
}
}