ChangeTextGenerator.java

/*
 * Copyright 2007 Guy Van den Broeck
 *
 * 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 org.outerj.daisy.diff.html.ancestor;

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

import org.eclipse.compare.rangedifferencer.RangeDifference;
import org.outerj.daisy.diff.html.ancestor.tagtostring.TagToString;
import org.outerj.daisy.diff.html.ancestor.tagtostring.TagToStringFactory;
import org.outerj.daisy.diff.html.dom.TagNode;
import org.outerj.daisy.diff.html.modification.HtmlLayoutChange;

public class ChangeTextGenerator {

	private List<HtmlLayoutChange> htmlLayoutChanges = null;
	
    private AncestorComparator ancestorComparator;

    private AncestorComparator other;

    private TagToStringFactory factory;

    private Locale locale;
    
    private static final int MAX_OUTPUT_LINE_LENGTH = 55;   //   Lines won't go longer than this unless a single word it longer than this.

    public ChangeTextGenerator(AncestorComparator ancestorComparator,
            AncestorComparator other, Locale locale) {
        this.ancestorComparator = ancestorComparator;
        this.other = other;
        this.factory = new TagToStringFactory();
        this.locale = locale;
        
        htmlLayoutChanges = new ArrayList<HtmlLayoutChange>();
    }

    public ChangeText getChanged(RangeDifference... differences) {
        ChangeText txt = new ChangeText(ChangeTextGenerator.MAX_OUTPUT_LINE_LENGTH);

        boolean rootlistopened = false;

        if (differences.length > 1) {
            txt.addHtml("<ul class='changelist'>");
            rootlistopened = true;
        }

        for (int j = 0; j < differences.length; j++) {

            RangeDifference d = differences[j];

            boolean lvl1listopened = false;

            if (rootlistopened) {
                txt.addHtml("<li>");
            }

            if (d.leftLength() + d.rightLength() > 1) {
                txt.addHtml("<ul class='changelist'>");
                lvl1listopened = true;
            }

            // left are the old ones
            for (int i = d.leftStart(); i < d.leftEnd(); i++) {
                if (lvl1listopened)
                    txt.addHtml("<li>");

                // add a bullet for a old tag
                addTagOld(txt, other.getAncestor(i));

                if (lvl1listopened)
                    txt.addHtml("</li>");

            }

            // right are the new ones
            for (int i = d.rightStart(); i < d.rightEnd(); i++) {
                if (lvl1listopened)
                    txt.addHtml("<li>");

                // add a bullet for a new tag
                addTagNew(txt, this.getAncestor(i));

                if (lvl1listopened)
                    txt.addHtml("</li>");

            }

            if (lvl1listopened) {
                txt.addHtml("</ul>");
            }

            if (rootlistopened) {
                txt.addHtml("</li>");
            }
        }

        if (rootlistopened) {
            txt.addHtml("</ul>");
        }

        return txt;

    }

    private void addTagOld(ChangeText txt, TagNode ancestor) {
    	TagToString tagToString = factory.create(ancestor, locale);
    	tagToString.getRemovedDescription(txt);
    	htmlLayoutChanges.add(tagToString.getHtmlLayoutChange());
    }

    private void addTagNew(ChangeText txt, TagNode ancestor) {
    	TagToString tagToString = factory.create(ancestor, locale);
    	tagToString.getAddedDescription(txt);
    	htmlLayoutChanges.add(tagToString.getHtmlLayoutChange());
    }

    private TagNode getAncestor(int i) {
        return ancestorComparator.getAncestor(i);
    }

	/**
	 * @return the htmlChange
	 */
	public List<HtmlLayoutChange> getHtmlLayoutChanges() {
		return htmlLayoutChanges;
	}
    
    

}