cosname.java

非常有用的操作pdf文件的java源码

    */
    public static final COSName KIDS = new COSName( "Kids" );
    /**
    * A common COSName value.
    */
    public static final COSName LAB = new COSName( "Lab" );
    /**
    * A common COSName value.
    */
    public static final COSName LAST_CHAR = new COSName( "LastChar" );
    /**
    * A common COSName value.
    */
    public static final COSName LENGTH = new COSName( "Length" );
    /**
     * A common COSName value.
     */
    public static final COSName LENGTH1 = new COSName( "Length1" );
    /**
    * A common COSName value.
    */
    public static final COSName LZW_DECODE = new COSName( "LZWDecode" );
    /**
    * A common COSName value.
    */
    public static final COSName LZW_DECODE_ABBREVIATION = new COSName( "LZW" );
    /**
    * A common COSName value.
    */
    public static final COSName MAC_ROMAN_ENCODING = new COSName( "MacRomanEncoding" );
    /**
    * A common COSName value.
    */
    public static final COSName MATRIX = new COSName( "Matrix" );
    /**
     * A common COSName value.
     */
    public static final COSName MEDIA_BOX = new COSName(  "MediaBox" );
    /**
     * A common COSName value.
     */
    public static final COSName METADATA = new COSName(  "Metadata" );
    /**
    * A common COSName value.
    */
    public static final COSName N = new COSName( "N" );
    /**
    * A common COSName value.
    */
    public static final COSName NAME = new COSName( "Name" );
    /**
    * A common COSName value.
    */
    public static final COSName P = new COSName( "P" );
    /**
    * A common COSName value.
    */
    public static final COSName PAGE = new COSName( "Page" );
    /**
    * A common COSName value.
    */
    public static final COSName PAGES = new COSName( "Pages" );
    /**
    * A common COSName value.
    */
    public static final COSName PARENT = new COSName( "Parent" );
    /**
    * A common COSName value.
    */
    public static final COSName PATTERN = new COSName( "Pattern" );
    /**
    * A common COSName value.
    */
    public static final COSName PDF_DOC_ENCODING = new COSName( "PDFDocEncoding" );
    /**
    * A common COSName value.
    */
    public static final COSName PREV = new COSName( "Prev" );
    /**
     * A common COSName value.
     */
     public static final COSName R = new COSName( "R" );
    /**
    * A common COSName value.
    */
    public static final COSName RESOURCES = new COSName( "Resources" );
    /**
    * A common COSName value.
    */
    public static final COSName ROOT = new COSName( "Root" );
    /**
     * A common COSName value.
     */
    public static final COSName ROTATE = new COSName(  "Rotate" );
    /**
    * A common COSName value.
    */
    public static final COSName RUN_LENGTH_DECODE = new COSName( "RunLengthDecode" );
    /**
    * A common COSName value.
    */
    public static final COSName RUN_LENGTH_DECODE_ABBREVIATION = new COSName( "RL" );
    /**
    * A common COSName value.
    */
    public static final COSName SEPARATION = new COSName( "Separation" );
    /**
    * A common COSName value.
    */
    public static final COSName STANDARD_ENCODING = new COSName( "StandardEncoding" );
    /**
    * A common COSName value.
    */
    public static final COSName SUBTYPE = new COSName( "Subtype" );
    /**
     * A common COSName value.
     */
    public static final COSName TRIM_BOX = new COSName("TrimBox" );
    /**
     * A common COSName value.
     */
    public static final COSName TRUE_TYPE = new COSName("TrueType" );
    /**
    * A common COSName value.
    */
    public static final COSName TO_UNICODE = new COSName( "ToUnicode" );
    /**
    * A common COSName value.
    */
    public static final COSName TYPE = new COSName( "Type" );
    /**
     * A common COSName value.
     */
    public static final COSName TYPE0 = new COSName(  "Type0" );
    /**
    * A common COSName value.
    */
    public static final COSName V = new COSName( "V" );
    /**
     * A common COSName value.
     */
     public static final COSName VERSION = new COSName( "Version" );
    /**
    * A common COSName value.
    */
    public static final COSName WIDTHS = new COSName( "Widths" );
    /**
    * A common COSName value.
    */
    public static final COSName WIN_ANSI_ENCODING = new COSName( "WinAnsiEncoding" );
    /**
    * A common COSName value.
    */
    public static final COSName XOBJECT = new COSName( "XObject" );
    
    /**
     * The prefix to a PDF name.
     */
    public static final byte[] NAME_PREFIX = new byte[] { 47  }; // The / character
    /**
     * The escape character for a name.
     */
    public static final byte[] NAME_ESCAPE = new byte[] { 35  };  //The # character

    private String name;
    private int hashCode;

    /**
     * This will get a COSName object with that name.
     *
     * @param aName The name of the object.
     *
     * @return A COSName with the specified name.
     */
    public static final COSName getPDFName( String aName )
    {
        COSName name = null;
        if( aName != null )
        {
            name = (COSName)nameMap.get( aName );
            if( name == null )
            {
                //name is added to map in the constructor
                name = new COSName( aName );
            }
        }
        return name;
    }

    /**
     * Private constructor.  This will limit the number of COSName objects.
     * that are created.
     *
     * @param aName The name of the COSName object.
     */
    private COSName( String aName )
    {
        name = aName;
        nameMap.put( aName, this );
        hashCode = name.hashCode();
    }

    /**
     * This will get the name of this COSName object.
     *
     * @return The name of the object.
     */
    public String getName()
    {
        return name;
    }

    /**
     * {@inheritDoc}
     */
    public String toString()
    {
        return "COSName{" + name + "}";
    }

    /**
     * {@inheritDoc}
     */
    public boolean equals( Object o )
    {
        boolean retval = this == o;
        if( !retval && o instanceof COSName )
        {
            COSName other = (COSName)o;
            retval = name == other.name || name.equals( other.name );
        }
        return retval;
    }

    /**
     * {@inheritDoc}
     */
    public int hashCode()
    {
        return hashCode;
    }
    
    /**
     * {@inheritDoc}
     */
    public int compareTo(Object o)
    {
        COSName other = (COSName)o;
        return this.name.compareTo( other.name );
    }



    /**
     * visitor pattern double dispatch method.
     *
     * @param visitor The object to notify when visiting this object.
     * @return any object, depending on the visitor implementation, or null
     * @throws COSVisitorException If an error occurs while visiting this object.
     */
    public Object accept(ICOSVisitor  visitor) throws COSVisitorException
    {
        return visitor.visitFromName(this);
    }
    
    /**
     * This will output this string as a PDF object.
     *  
     * @param output The stream to write to.
     * @throws IOException If there is an error writing to the stream.
     */
    public void writePDF( OutputStream output ) throws IOException
    {
        output.write(NAME_PREFIX);
        byte[] bytes = getName().getBytes();
        for (int i = 0; i < bytes.length;i++)
        {
            int current = ((bytes[i]+256)%256);

            if(current <= 32 || current >= 127 ||
               current == '(' ||
               current == ')' ||
               current == '[' ||
               current == ']' ||
               current == '/' ||
               current == '%' ||
               current == '<' ||
               current == '>' ||
               current == NAME_ESCAPE[0] )
            {
                output.write(NAME_ESCAPE);
                output.write(COSHEXTable.TABLE[current]);
            }
            else
            {
                output.write(current);
            }
        }
    }
}