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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.render.rtf.rtflib.rtfdoc;
-
- /*
- * This file is part of the RTF library of the FOP project, which was originally
- * created by Bertrand Delacretaz bdelacretaz@codeconsult.ch and by other
- * contributors to the jfor project (www.jfor.org), who agreed to donate jfor to
- * the FOP project.
- */
-
- import java.util.StringTokenizer;
-
- /**
- * <p>Collapses whitespace of an RtfContainer that contains RtfText elements.</p>
- *
- * <p>This work was authored by Bertrand Delacretaz (bdelacretaz@codeconsult.ch).</p>
- */
-
- final class WhitespaceCollapser {
-
- private static final String SPACE = " ";
- private boolean lastEndSpace = true;
-
- /**
- * Remove extra whitespace in RtfText elements that are inside container.
- * @param c the container
- */
- WhitespaceCollapser(RtfContainer c) {
- // process all texts
- for (final Object kid : c.getChildren()) {
- if (kid instanceof RtfText) {
- RtfText current = (RtfText) kid;
- processText(current);
- } else if (kid instanceof RtfString) {
- RtfString current = (RtfString) kid;
- processString(current);
- } else {
- // if there is something between two texts, it counts for a space
- lastEndSpace = true;
- }
- }
- }
-
- /** @return last end space */
- public boolean getLastEndSpace() {
- return lastEndSpace;
- }
-
- /** process one RtfText from our container */
- private void processText(RtfText txt) {
- final String newString = processString(txt.getText());
- if (newString != null) {
- txt.setText(newString);
- }
- }
-
- /** process one RtfString from our container */
- private void processString(RtfString txt) {
- final String newString = processString(txt.getText());
- if (newString != null) {
- txt.setText(newString);
- }
- }
-
- /** process one String */
- private String processString(String txt) {
- final String orig = txt;
-
- // tokenize the text based on whitespace and regenerate it so as
- // to collapse multiple spaces into one
- if (orig == null) {
- return null;
- } else if (orig.length() > 0) {
- final boolean allSpaces = orig.trim().length() == 0;
- final boolean endSpace = allSpaces
- || Character.isWhitespace(orig.charAt(orig.length() - 1));
- final boolean beginSpace = Character.isWhitespace(orig.charAt(0));
- final StringBuffer sb = new StringBuffer(orig.length());
-
- // if text contains spaces only, keep at most one
- if (allSpaces) {
- if (!lastEndSpace) {
- sb.append(SPACE);
- }
- } else {
- // TODO to be compatible with different Locales, should use Character.isWhitespace
- // instead of this limited list
- boolean first = true;
- final StringTokenizer stk = new StringTokenizer(txt, " \t\n\r");
- while (stk.hasMoreTokens()) {
- if (first && beginSpace && !lastEndSpace) {
- sb.append(SPACE);
- }
- first = false;
-
- sb.append(stk.nextToken());
- if (stk.hasMoreTokens() || endSpace) {
- sb.append(SPACE);
- }
- }
- }
-
- lastEndSpace = endSpace;
- return sb.toString();
- } else {
- return "";
- }
- }
- }
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