itextpdf-master/itext/src/main/java/com/itextpdf/text/html/simpleparser/ChainedProperties.java
/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2022 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
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 * or FITNESS FOR A PARTICULAR PURPOSE.
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 * Section 5 of the GNU Affero General Public License.
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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
 * @deprecated since 5.5.2
 */
@Deprecated
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)));
	}
}
