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docx4j is a library which helps you to work with the Office Open XML file format as used in docx documents, pptx presentations, and xlsx spreadsheets.

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/*
 *  Copyright 2013-2016, Plutext Pty Ltd.
 *
 *  This file is part of docx4j.

    docx4j is 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.docx4j.toc.switches;

import org.docx4j.model.PropertyResolver;
import org.docx4j.toc.TocEntry;
import org.docx4j.wml.Style;

public class NSwitch extends AbstractSwitch {

    public static final String ID = "\\n";
    private static final int PRIORITY = 7;

    @Override
    public boolean hasFieldArgument() {
        return true;
    }

    @Override
    public void process(Style s, SwitchProcessor sp) {
        TocEntry te = sp.getEntry();
        if(fieldArgument == null){
            sp.setPageNumbers(false);
            te.addPageNumber(false);
            return;
        }
        int entryLevel = te.getEntryLevel();
        if(entryLevel != -1){
            if(!pageNumbers()){
                te.addPageNumber(false);
            }
            if(entryLevel >= getStartLevel() && entryLevel <= getEndLevel()){
                te.addPageNumber(false); // ???
            }
        }
    }
    
    @Override
    public String parseFieldArgument(String fieldArgument) {
        this.fieldArgument = fieldArgument;
        if(fieldArgument != null){
            if(getStartLevel() == -1 || getEndLevel() == -1){
                return ERROR_NOT_VALID_HEADING_LEVEL;
            }
        }
        return EMPTY;
    }
    
    public boolean pageNumbers(){
        return fieldArgument != null;
    }

    @Override
    public int getPriority() {
        return PRIORITY;
    }

}