org.jpedal.objects.PageLookup Maven / Gradle / Ivy

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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2015 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
     This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * PageLookup.java
 * ---------------
 */
package org.jpedal.objects;

import java.util.HashMap;
import java.util.Map;

/**
 * allow us to lookup pages
 */
public class PageLookup {
	
	/**holds pdf id (ie 4 0 R) which stores each object in reverse so we can lookup*/
	private Map pageLookup = new HashMap();
	
	/**
	 * used to work out page id for the object (returns -1 if no value found)
	 */
	public int convertObjectToPageNumber(final String offset){
		
		final Object value=pageLookup.get(offset);
		
		if(value==null) {
            return -1;
        } else{
			return (Integer) value;
		}
		
		
	}
	
	/**
	 * The pageLookup to set.
	 */
	public void put(final String key, final int value) {
		pageLookup.put(key, value);
		
	}

	public void dispose() {
		
		if(pageLookup!=null) {
            pageLookup.clear();
        }
		pageLookup=null;
		
	}
}