mutablesection.java

java 报表 to office文档： 本包由java语言开发

        return sectionBytes.length;
    }



    /**
     * <p>Writes this section into an output stream.</p>
     * 
     * <p>Internally this is done by writing into three byte array output
     * streams: one for the properties, one for the property list and one for
     * the section as such. The two former are appended to the latter when they
     * have received all their data.</p>
     *
     * @param out The stream to write into.
     *
     * @return The number of bytes written, i.e. the section's size.
     * @exception IOException if an I/O error occurs
     * @exception WritingNotSupportedException if HPSF does not yet support
     * writing a property's variant type.
     */
    public int write(final OutputStream out)
        throws WritingNotSupportedException, IOException
    {
        /* Check whether we have already generated the bytes making out the
         * section. */
        if (!dirty && sectionBytes != null)
        {
            out.write(sectionBytes);
            return sectionBytes.length;
        }

        /* The properties are written to this stream. */
        final ByteArrayOutputStream propertyStream =
            new ByteArrayOutputStream();

        /* The property list is established here. After each property that has
         * been written to "propertyStream", a property list entry is written to
         * "propertyListStream". */
        final ByteArrayOutputStream propertyListStream =
            new ByteArrayOutputStream();
 
        /* Maintain the current position in the list. */
        int position = 0;

        /* Increase the position variable by the size of the property list so
         * that it points behind the property list and to the beginning of the
         * properties themselves. */
        position += 2 * LittleEndian.INT_SIZE +
                    getPropertyCount() * 2 * LittleEndian.INT_SIZE;

        /* Writing the section's dictionary it tricky. If there is a dictionary
         * (property 0) the codepage property (property 1) must be set, too. */
        int codepage = -1;
        if (getProperty(PropertyIDMap.PID_DICTIONARY) != null)
        {
            final Object p1 = getProperty(PropertyIDMap.PID_CODEPAGE);
            if (p1 != null)
            {
                if (!(p1 instanceof Integer))
                    throw new IllegalPropertySetDataException
                        ("The codepage property (ID = 1) must be an " +
                         "Integer object.");
            }
            else
                /* Warning: The codepage property is not set although a
                 * dictionary is present. In order to cope with this problem we
                 * add the codepage property and set it to Unicode. */
                setProperty(PropertyIDMap.PID_CODEPAGE, (long) Variant.VT_I2,
                            new Integer(Constants.CP_UNICODE));
            codepage = getCodepage();
        }

        /* Sort the property list by their property IDs: */
        Collections.sort(preprops, new Comparator()
            {
                public int compare(final Object o1, final Object o2)
                {
                    final Property p1 = (Property) o1;
                    final Property p2 = (Property) o2;
                    if (p1.getID() < p2.getID())
                        return -1;
                    else if (p1.getID() == p2.getID())
                        return 0;
                    else
                        return 1;
                }
            });

        /* Write the properties and the property list into their respective
         * streams: */
        for (final ListIterator i = preprops.listIterator(); i.hasNext();)
        {
            final MutableProperty p = (MutableProperty) i.next();
            final long id = p.getID();
            
            /* Write the property list entry. */
            TypeWriter.writeUIntToStream(propertyListStream, p.getID());
            TypeWriter.writeUIntToStream(propertyListStream, position);

            /* If the property ID is not equal 0 we write the property and all
             * is fine. However, if it equals 0 we have to write the section's
             * dictionary which has an implicit type only and an explicit
             * value. */
            if (id != 0)
                /* Write the property and update the position to the next
                 * property. */
                position += p.write(propertyStream, getCodepage());
            else
            {
                if (codepage == -1)
                    throw new IllegalPropertySetDataException
                        ("Codepage (property 1) is undefined.");
                position += writeDictionary(propertyStream, dictionary,
                                            codepage);
            }
        }
        propertyStream.close();
        propertyListStream.close();

        /* Write the section: */
        byte[] pb1 = propertyListStream.toByteArray();
        byte[] pb2 = propertyStream.toByteArray();
        
        /* Write the section's length: */
        TypeWriter.writeToStream(out, LittleEndian.INT_SIZE * 2 +
                                      pb1.length + pb2.length);
        
        /* Write the section's number of properties: */
        TypeWriter.writeToStream(out, getPropertyCount());
        
        /* Write the property list: */
        out.write(pb1);
        
        /* Write the properties: */
        out.write(pb2);

        int streamLength = LittleEndian.INT_SIZE * 2 + pb1.length + pb2.length;
        return streamLength;
    }



    /**
     * <p>Writes the section's dictionary.</p>
     *
     * @param out The output stream to write to.
     * @param dictionary The dictionary.
     * @param codepage The codepage to be used to write the dictionary items.
     * @return The number of bytes written
     * @exception IOException if an I/O exception occurs.
     */
    private static int writeDictionary(final OutputStream out,
                                       final Map dictionary, final int codepage)
        throws IOException
    {
        int length = TypeWriter.writeUIntToStream(out, dictionary.size());
        for (final Iterator i = dictionary.keySet().iterator(); i.hasNext();)
        {
            final Long key = (Long) i.next();
            final String value = (String) dictionary.get(key);

            if (codepage == Constants.CP_UNICODE)
            {
                /* Write the dictionary item in Unicode. */
                int sLength = value.length() + 1;
                if (sLength % 2 == 1)
                    sLength++;
                length += TypeWriter.writeUIntToStream(out, key.longValue());
                length += TypeWriter.writeUIntToStream(out, sLength);
                final char[] ca = value.toCharArray();
                for (int j = 0; j < ca.length; j++)
                {
                    int high = (ca[j] & 0x0ff00) >> 8;
                    int low  = (ca[j] & 0x000ff);
                    out.write(low);
                    out.write(high);
                    length += 2;
                    sLength--;
                }
                while (sLength > 0)
                {
                    out.write(0x00);
                    out.write(0x00);
                    length += 2;
                    sLength--;
                }
            }
            else
            {
                /* Write the dictionary item in another codepage than
                 * Unicode. */
                length += TypeWriter.writeUIntToStream(out, key.longValue());
                length += TypeWriter.writeUIntToStream(out, value.length() + 1);
                final byte[] ba =
                    value.getBytes(VariantSupport.codepageToEncoding(codepage));
                for (int j = 0; j < ba.length; j++)
                {
                    out.write(ba[j]);
                    length++;
                }
                out.write(0x00);
                length++;
            }
        }
        return length;
    }



    /**
     * <p>Overwrites the super class' method to cope with a redundancy:
     * the property count is maintained in a separate member variable, but
     * shouldn't.</p>
     * 
     * @return The number of properties in this section
     */
    public int getPropertyCount()
    {
        return preprops.size();
    }



    /**
     * <p>Gets this section's properties.</p>
     * 
     * @return this section's properties.
     */
    public Property[] getProperties()
    {
        properties = (Property[]) preprops.toArray(new Property[0]);
        return properties;
    }



    /**
     * <p>Gets a property.</p>
     * 
     * @param id The ID of the property to get
     * @return The property or <code>null</code> if there is no such property
     */
    public Object getProperty(final long id)
    {
        /* Calling getProperties() ensures that properties and preprops are in
         * sync.</p> */
        getProperties();
        return super.getProperty(id);
    }



    /**
     * <p>Sets the section's dictionary. All keys in the dictionary must be
     * {@link java.lang.Long} instances, all values must be
     * {@link java.lang.String}s. This method overwrites the properties with IDs
     * 0 and 1 since they are reserved for the dictionary and the dictionary's
     * codepage. Setting these properties explicitly might have surprising
     * effects. An application should never do this but always use this
     * method.</p>
     *
     * @param dictionary The dictionary
     * 
     * @exception IllegalPropertySetDataException if the dictionary's key and
     * value types are not correct.
     * 
     * @see Section#getDictionary()
     */
    public void setDictionary(final Map dictionary)
        throws IllegalPropertySetDataException
    {
        if (dictionary != null)
        {
            for (final Iterator i = dictionary.keySet().iterator();
                 i.hasNext();)
                if (!(i.next() instanceof Long))
                    throw new IllegalPropertySetDataException
                        ("Dictionary keys must be of type Long.");
            for (final Iterator i = dictionary.values().iterator();
                 i.hasNext();)
                if (!(i.next() instanceof String))
                    throw new IllegalPropertySetDataException
                        ("Dictionary values must be of type String.");
            this.dictionary = dictionary;

            /* Set the dictionary property (ID 0). Please note that the second
             * parameter in the method call below is unused because dictionaries
             * don't have a type. */
            setProperty(PropertyIDMap.PID_DICTIONARY, -1, dictionary);

            /* If the codepage property (ID 1) for the strings (keys and
             * values) used in the dictionary is not yet defined, set it to
             * Unicode. */
            final Integer codepage =
                (Integer) getProperty(PropertyIDMap.PID_CODEPAGE);
            if (codepage == null)
                setProperty(PropertyIDMap.PID_CODEPAGE, Variant.VT_I2,
                            new Integer(Constants.CP_UNICODE));
        }
        else
            /* Setting the dictionary to null means to remove property 0.
             * However, it does not mean to remove property 1 (codepage). */
            removeProperty(PropertyIDMap.PID_DICTIONARY);
    }

}