package org.hccp.pdf;

public class Document {


    private Header header;
    private Body body;
    private CrossReferenceTable xRefTable;
    private Trailer trailer;


    public Document() {

        header = new Header();
        body = new Body();
        xRefTable = new CrossReferenceTable(header, body);
        trailer = new Trailer(getCrossReferenceTableOffset());
        trailer.setRoot(new IndirectObjectReference(new Numeric(1), new Numeric(0)));

    }

    public Numeric getCrossReferenceTableOffset()  {
        return new Numeric(header.getValue().getBytes().length + body.getValue().getBytes().length);
    }

    public Body getBody()  {
        return body;
    }

    public String getValue()  {
        xRefTable.refresh();
        trailer.setCrossReferenceTableOffset(this.getCrossReferenceTableOffset());
        StringBuffer sb = new StringBuffer();
        sb.append(header.getValue());
        sb.append(body.getValue());
        sb.append(xRefTable.getValue());
        sb.append(trailer.getValue());
        return sb.toString();
    }

}