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JWKTL (Java Wiktionary Library) is a Java-based API that enables efficient and structured access to the information encoded in the English and the German Wiktionary edition, including sense definitions, part of speech tags, etymology, example sentences, translations, semantic relations and many other lexical information types.

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/*******************************************************************************
 * Copyright 2013
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universität Darmstadt
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package de.tudarmstadt.ukp.jwktl.parser.en.components;

import java.util.ArrayList;
import java.util.List;

import de.tudarmstadt.ukp.jwktl.api.IWikiString;
import de.tudarmstadt.ukp.jwktl.api.entry.WikiString;
import de.tudarmstadt.ukp.jwktl.api.entry.WiktionaryEntry;
import de.tudarmstadt.ukp.jwktl.api.util.Language;
import de.tudarmstadt.ukp.jwktl.parser.util.ParsingContext;

/**
 * Parser component for extracting references and external links from 
 * the English Wiktionary. 
 * @author Christian M. Meyer
 * @author Lizhen Qu
 */
public class ENReferenceHandler extends ENBlockHandler {
	
	protected List references;
	protected boolean inTemplate;
	
	/** Initializes the block handler for parsing all sections starting with 
	 *  one of the specified labels. */
	public ENReferenceHandler() {
		super("References", "External links", "External lnks");
	}

	@Override
	public boolean processHead(String textLine, ParsingContext context) {
		references = new ArrayList<>();
		inTemplate = false;
		return true;
	}
	
	@Override
	public boolean processBody(String textLine, ParsingContext context) {
		textLine = textLine.trim();
		if (textLine.startsWith("{{quote-")) {
			inTemplate = true;
		} else
		if (inTemplate || textLine.startsWith("|")) {
			if (textLine.contains("}}"))
				inTemplate = false;
		} else
		if (textLine.startsWith("{{")) {
			references.add(new WikiString(textLine.trim()));
		} else
		if (textLine.startsWith("*")) {
			textLine = textLine.substring(1);
			references.add(new WikiString(textLine.trim()));
		} else
			return false;
		
		return true;
	}

	/**
	 * Add external links to WordEntry
	 */
	public void fillContent(final ParsingContext context) {
		// Add references to all previous entries of the same language.
		WiktionaryEntry entry = context.findEntry();
		context.getPage().entries()
			.stream()
			.filter(e -> Language.equals(e.getWordLanguage(), entry.getWordLanguage()))
			.map(WiktionaryEntry::getUnassignedSense)
			.forEach(unassignedSense -> {
				for (IWikiString reference : references)
					unassignedSense.addReference(reference);
				}
			);
	}
}