/*
* $Id: Meta.java 4784 2011-03-15 08:33:00Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2011 1T3XT BVBA
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
* 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text;
import java.util.List;
import java.util.ArrayList;
/**
* This is an <CODE>Element</CODE> that contains
* some meta information about the document.
* <P>
* An object of type <CODE>Meta</CODE> can not be constructed by the user.
* User defined meta information should be placed in a <CODE>Header</CODE>-object.
* <CODE>Meta</CODE> is reserved for: Subject, Keywords, Author, Title, Producer
* and Creationdate information.
*
* @see Element
* @see Header
*/
public class Meta implements Element {
// membervariables
/** This is the type of Meta-information this object contains. */
private final int type;
/** This is the content of the Meta-information. */
private final StringBuffer content;
/**
* The possible value of an alignment attribute.
* @since 5.0.6 (moved from ElementTags)
*/
public static final String UNKNOWN = "unknown";
/**
* The possible value of an alignment attribute.
* @since 5.0.6 (moved from ElementTags)
*/
public static final String PRODUCER = "producer";
/**
* The possible value of an alignment attribute.
* @since 5.0.6 (moved from ElementTags)
*/
public static final String CREATIONDATE = "creationdate";
/**
* The possible value of an alignment attribute.
* @since 5.0.6 (moved from ElementTags)
*/
public static final String AUTHOR = "author";
/**
* The possible value of an alignment attribute.
* @since 5.0.6 (moved from ElementTags)
*/
public static final String KEYWORDS = "keywords";
/**
* The possible value of an alignment attribute.
* @since 5.0.6 (moved from ElementTags)
*/
public static final String SUBJECT = "subject";
/**
* The possible value of an alignment attribute.
* @since 5.0.6 (moved from ElementTags)
*/
public static final String TITLE = "title";
// constructors
/**
* Constructs a <CODE>Meta</CODE>.
*
* @param type the type of meta-information
* @param content the content
*/
Meta(final int type, final String content) {
this.type = type;
this.content = new StringBuffer(content);
}
/**
* Constructs a <CODE>Meta</CODE>.
*
* @param tag the tagname of the meta-information
* @param content the content
*/
public Meta(final String tag, final String content) {
this.type = Meta.getType(tag);
this.content = new StringBuffer(content);
}
// implementation of the Element-methods
/**
* Processes the element by adding it (or the different parts) to a
* <CODE>ElementListener</CODE>.
*
* @param listener the <CODE>ElementListener</CODE>
* @return <CODE>true</CODE> if the element was processed successfully
*/
public boolean process(final ElementListener listener) {
try {
return listener.add(this);
}
catch(DocumentException de) {
return false;
}
}
/**
* Gets the type of the text element.
*
* @return a type
*/
public int type() {
return type;
}
/**
* Gets all the chunks in this element.
*
* @return an <CODE>ArrayList</CODE>
*/
public List<Chunk> getChunks() {
return new ArrayList<Chunk>();
}
/**
* @see com.itextpdf.text.Element#isContent()
* @since iText 2.0.8
*/
public boolean isContent() {
return false;
}
/**
* @see com.itextpdf.text.Element#isNestable()
* @since iText 2.0.8
*/
public boolean isNestable() {
return false;
}
// methods
/**
* appends some text to this <CODE>Meta</CODE>.
*
* @param string a <CODE>String</CODE>
* @return a <CODE>StringBuffer</CODE>
*/
public StringBuffer append(final String string) {
return content.append(string);
}
// methods to retrieve information
/**
* Returns the content of the meta information.
*
* @return a <CODE>String</CODE>
*/
public String getContent() {
return content.toString();
}
/**
* Returns the name of the meta information.
*
* @return a <CODE>String</CODE>
*/
public String getName() {
switch (type) {
case Element.SUBJECT:
return Meta.SUBJECT;
case Element.KEYWORDS:
return Meta.KEYWORDS;
case Element.AUTHOR:
return Meta.AUTHOR;
case Element.TITLE:
return Meta.TITLE;
case Element.PRODUCER:
return Meta.PRODUCER;
case Element.CREATIONDATE:
return Meta.CREATIONDATE;
default:
return Meta.UNKNOWN;
}
}
/**
* Returns the name of the meta information.
*
* @param tag iText tag for meta information
* @return the Element value corresponding with the given tag
*/
public static int getType(final String tag) {
if (Meta.SUBJECT.equals(tag)) {
return Element.SUBJECT;
}
if (Meta.KEYWORDS.equals(tag)) {
return Element.KEYWORDS;
}
if (Meta.AUTHOR.equals(tag)) {
return Element.AUTHOR;
}
if (Meta.TITLE.equals(tag)) {
return Element.TITLE;
}
if (Meta.PRODUCER.equals(tag)) {
return Element.PRODUCER;
}
if (Meta.CREATIONDATE.equals(tag)) {
return Element.CREATIONDATE;
}
return Element.HEADER;
}
}
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