package org.hccp.pdf;
/**
 * Class representing an entry into a cross-reference table. Should not be explicitly
 * created when building documents. Management of entry objects should be left to
 * the {@link CrossReferenceTable} object.
 *
 * @see CrossReferenceTable
 * @see CrossReferenceTableEntryException
 **/
public class Entry {


    private String objectNumber;
    private String genNumber;
    private static final String FREE = "f";
    private static final String IN_USE = "n";
    private static final String EOL = "\n";
    private boolean isFree;
    
    
    Entry() {
        isFree = false;
    }

    public void setIsFree(boolean flag) {
        isFree = flag;
    }

    public void setObjectNumber(String s) {
        for(int i = s.length(); i < 10; i++) {
            s = "0" + s;
		}
        objectNumber = s;
    }

    public void setGenNumber(String s) {
        for(int i = s.length(); i < 5; i++) {
            s = "0" + s;
		}
        genNumber = s;
    }

    public String getValue() throws CrossReferenceTableEntryException {
        StringBuffer sb = new StringBuffer(20);
        sb.append(objectNumber);
        sb.append(" ");
        sb.append(genNumber);
        sb.append(" ");
        if(isFree) {
            sb.append(FREE);
        } else {
            sb.append(IN_USE);
        }
        sb.append(" ");
        sb.append(EOL);
        if(sb.length() != 20) {
            throw new CrossReferenceTableEntryException("Illegal length for Entry: (Length: " + sb.length() + ")" + sb.toString());
        } else {
            return sb.toString();
		}
    }


}