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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.pdf;
-
- import java.io.IOException;
- import java.io.OutputStream;
-
- import org.apache.xmlgraphics.util.io.FlateEncodeOutputStream;
-
- /**
- * A filter to deflate a stream.
- * <p>
- * <b>Note</b> that the attributes for
- * prediction, colors, bitsPerComponent, and columns are not supported
- * when this filter is used to handle the data compression. They are
- * only valid for externally encoded data such as that from a graphics
- * file.
- */
- public class FlateFilter extends PDFFilter {
- /**
- * The supported mode when this filter is used for data compression
- */
- public static final int PREDICTION_NONE = 1;
-
- /**
- * Mode for externally encoded data.
- */
- public static final int PREDICTION_TIFF2 = 2;
-
- /**
- * Mode for externally encoded data.
- */
- public static final int PREDICTION_PNG_NONE = 10;
-
- /**
- * Mode for externally encoded data.
- */
- public static final int PREDICTION_PNG_SUB = 11;
-
- /**
- * Mode for externally encoded data.
- */
- public static final int PREDICTION_PNG_UP = 12;
-
- /**
- * Mode for externally encoded data.
- */
- public static final int PREDICTION_PNG_AVG = 13;
-
- /**
- * Mode for externally encoded data.
- */
- public static final int PREDICTION_PNG_PAETH = 14;
-
- /**
- * Mode for externally encoded data.
- */
- public static final int PREDICTION_PNG_OPT = 15;
-
-
- private int predictor = PREDICTION_NONE;
- private int colors;
- private int bitsPerComponent;
- private int columns;
-
- /**
- * Get the name of this filter.
- *
- * @return the pdf name of the flate decode filter
- */
- public String getName() {
- return "/FlateDecode";
- }
-
- /**
- * Get the decode params for this filter.
- *
- * @return a string containing the decode params for this filter
- */
- public PDFObject getDecodeParms() {
- if (predictor > PREDICTION_NONE) {
- PDFDictionary dict = new PDFDictionary();
- dict.put("Predictor", predictor);
- if (colors > 1) {
- dict.put("Colors", colors);
- }
- if (bitsPerComponent > 0 && bitsPerComponent != 8) {
- dict.put("BitsPerComponent", bitsPerComponent);
- }
- if (columns > 1) {
- dict.put("Columns", columns);
- }
- return dict;
- }
- return null;
- }
-
- /**
- * Set the predictor for this filter.
- *
- * @param predictor the predictor to use
- * @throws PDFFilterException if there is an error with the predictor
- */
- public void setPredictor(int predictor) throws PDFFilterException {
- this.predictor = predictor;
-
- }
-
- /**
- * Get the predictor for this filter.
- *
- * @return the predictor used for this filter
- */
- public int getPredictor() {
- return predictor;
- }
-
- /**
- * Set the colors for this filter.
- *
- * @param colors the colors to use
- * @throws PDFFilterException if predictor is not PREDICTION_NONE
- */
- public void setColors(int colors) throws PDFFilterException {
- if (predictor != PREDICTION_NONE) {
- this.colors = colors;
- } else {
- throw new PDFFilterException(
- "Prediction must not be PREDICTION_NONE in"
- + " order to set Colors");
- }
- }
-
- /**
- * Get the colors for this filter.
- *
- * @return the colors for this filter
- */
- public int getColors() {
- return colors;
- }
-
- /**
- * Set the number of bits per component.
- *
- * @param bits the number of bits per component
- * @throws PDFFilterException if predictor is not PREDICTION_NONE
- */
- public void setBitsPerComponent(int bits) throws PDFFilterException {
- if (predictor != PREDICTION_NONE) {
- bitsPerComponent = bits;
- } else {
- throw new PDFFilterException(
- "Prediction must not be PREDICTION_NONE in order"
- + " to set bitsPerComponent");
- }
- }
-
- /**
- * Get the number of bits per component.
- *
- * @return the number of bits per component
- */
- public int getBitsPerComponent() {
- return bitsPerComponent;
- }
-
- /**
- * Set the number of columns for this filter.
- *
- * @param columns the number of columns to use for the filter
- * @throws PDFFilterException if predictor is not PREDICTION_NONE
- */
- public void setColumns(int columns) throws PDFFilterException {
- if (predictor != PREDICTION_NONE) {
- this.columns = columns;
- } else {
- throw new PDFFilterException(
- "Prediction must not be PREDICTION_NONE in"
- + " order to set Columns");
- }
- }
-
- /**
- * Get the number of columns for this filter.
- *
- * @return the number of columns
- */
- public int getColumns() {
- return columns;
- }
-
-
- /** {@inheritDoc} */
- public OutputStream applyFilter(OutputStream out) throws IOException {
- if (isApplied()) {
- return out;
- } else {
- return new FlateEncodeOutputStream(out);
- }
- }
-
- }
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