package org.hccp.pdf;


/**
 *<pre>
 * The first line of a PDF file is a header identifying the version of the PDF
 * specification to which the file conforms. For a file conforming to PDF version 1.3,
 * the header should be
 *
 *  %PDF-1.3
 *  
 * However, since any file conforming to an earlier version of PDF also conforms to
 * version 1.3, an application that processes PDF 1.3 can also accept files with any of
 * the following headers:
 *
 *  %PDF-1.0
 *  %PDF-1.1
 *  %PDF-1.2
 *</pre>
 *<br>
 *<br>
 *<i>- PDF Reference, Second Edition v1.3</i>
 **/

public class Header implements DocumentObject {

    private String value;
    private String version;
    private static final String PREFIX = "%PDF-";
    private static final String DEFAULT = "1.3";

    /**
     * @param version a string of the form "1.1" or "1.2"
     **/
    public Header(String version) {
        value = PREFIX;
        if(version != null) {
            this.version = version;
        } else {
            version   = DEFAULT;
	}
    }
    /**
     * default constructor, sets the version to "1.3"
     **/
    public Header() {
        this(DEFAULT);
    }

    public String getValue() {
        return value + version + "\n";
    }

}