/*
* $Id: ChainedProperties.java 4666 2011-01-29 12:53:09Z 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,
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*/
package com.itextpdf.text.html.simpleparser;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import com.itextpdf.text.html.HtmlTags;
import com.itextpdf.text.html.HtmlUtilities;
/**
* Stores the hierarchy of tags along with the attributes of each tag.
* @since 5.0.6 renamed from ChainedProperties
*/
public class ChainedProperties {
/**
* Class that stores the info about one tag in the chain.
*/
private static final class TagAttributes {
/** A possible tag */
final String tag;
/** The styles corresponding with the tag */
final Map<String, String> attrs;
/**
* Constructs a chained property.
* @param tag an XML/HTML tag
* @param attrs the tag's attributes
*/
TagAttributes(String tag, Map<String, String> attrs) {
this.tag = tag;
this.attrs = attrs;
}
}
/** A list of chained properties representing the tag hierarchy. */
public List<TagAttributes> chain = new ArrayList<TagAttributes>();
/** Creates a new instance of ChainedProperties */
public ChainedProperties() {
}
/**
* Walks through the hierarchy (bottom-up) looking for
* a property key. Returns a value as soon as a match
* is found or null if the key can't be found.
* @param key the key of the property
* @return the value of the property
*/
public String getProperty(String key) {
for (int k = chain.size() - 1; k >= 0; --k) {
TagAttributes p = chain.get(k);
Map<String, String> attrs = p.attrs;
String ret = attrs.get(key);
if (ret != null)
return ret;
}
return null;
}
/**
* Walks through the hierarchy (bottom-up) looking for
* a property key. Returns true as soon as a match is
* found or false if the key can't be found.
* @param key the key of the property
* @return true if the key is found
*/
public boolean hasProperty(String key) {
for (int k = chain.size() - 1; k >= 0; --k) {
TagAttributes p = chain.get(k);
Map<String, String> attrs = p.attrs;
if (attrs.containsKey(key))
return true;
}
return false;
}
/**
* Adds a tag and its corresponding properties to the chain.
* @param tag the tags that needs to be added to the chain
* @param props the tag's attributes
*/
public void addToChain(String tag, Map<String, String> props) {
this.adjustFontSize(props);
chain.add(new TagAttributes(tag, props));
}
/**
* Walks through the hierarchy (bottom-up) and removes the
* first occurrence of a tag that is encountered.
* @param tag the tag that needs to be removed
*/
public void removeChain(String tag) {
for (int k = chain.size() - 1; k >= 0; --k) {
if (tag.equals(chain.get(k).tag)) {
chain.remove(k);
return;
}
}
}
/**
* If the properties contain a font size, the size may need to
* be adjusted based on font sizes higher in the hierarchy.
* @param attrs the attributes that may have to be updated
* @since 5.0.6 (renamed)
*/
protected void adjustFontSize(Map<String, String> attrs) {
// fetch the font size
String value = attrs.get(HtmlTags.SIZE);
// do nothing if the font size isn't defined
if (value == null)
return;
// the font is defined as a real size: remove "pt"
if (value.endsWith("pt")) {
attrs.put(HtmlTags.SIZE,
value.substring(0, value.length() - 2));
return;
}
String old = getProperty(HtmlTags.SIZE);
attrs.put(HtmlTags.SIZE, Integer.toString(HtmlUtilities.getIndexedFontSize(value, old)));
}
}
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