package org.hccp.pdf;

public class Trailer implements DocumentObject {

    private Numeric xRefOffset;
    private Dictionary trailerDictionary;

    private final String EOF = "%%EOF";
    private final String STARTXREF = "startxref";
    private final String TRAILER = "trailer";
    private final String SIZE = "Size";
    private final String ROOT = "Root";
    private final String EOL = "\n";

    public void setSize(Numeric numeric) {
        trailerDictionary.addEntry(new Name(SIZE), numeric);
    }

    public void setRoot(IndirectObjectReference indObjRef) {
        trailerDictionary.addEntry(new Name(ROOT), indObjRef);
    }

    public void setCrossReferenceTableOffset(Numeric numeric) {
        xRefOffset = numeric;
    }

    public Trailer(Numeric numeric) {
        trailerDictionary = new Dictionary();
        xRefOffset = numeric;
    }

    public String getValue() {
        StringBuffer sb = new StringBuffer();
        sb.append(TRAILER + EOL);
        sb.append(trailerDictionary.getValue());
        sb.append(STARTXREF + EOL);
        sb.append(xRefOffset.getValue() + EOL);
        sb.append(EOF + EOL);
        return sb.toString();
    }

}