| /* |
| * 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.pdf.pdfbox; |
| |
| import java.awt.Rectangle; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.pdfbox.cos.COSBase; |
| import org.apache.pdfbox.cos.COSDictionary; |
| import org.apache.pdfbox.cos.COSName; |
| import org.apache.pdfbox.cos.COSObject; |
| |
| import org.apache.fop.pdf.PDFDocument; |
| |
| /** |
| * This class provides collision-avoidance for names within a collection. |
| * That is, if a submitted name collides with a name in the collection, an alternative is provided. |
| * The alternative may or may not be in the collection. |
| */ |
| public class UniqueName { |
| // General key. |
| private String key; |
| // A key to be used only for pattern names. |
| private String patternKey = ""; |
| // General resource names. |
| private List<COSName> resourceNames; |
| // Pattern resource names. |
| private List<COSName> patternResourceNames = new ArrayList<>(); |
| |
| public UniqueName(String key, COSDictionary sourcePageResources, Iterable<COSName> patternNames, boolean disable, |
| Rectangle destRect) { |
| if (disable) { |
| resourceNames = Collections.emptyList(); |
| } else { |
| key = key.split("#")[0]; |
| this.key = Integer.toString(key.hashCode()); |
| if (patternNames != null) { |
| // Make pattern key unique to the destination rectangle. |
| this.patternKey = Integer.toString( |
| (key + destRect.getX() + destRect.getY() + destRect.getWidth() + destRect.getHeight() |
| ).hashCode()); |
| for (COSName cosName : patternNames) { |
| patternResourceNames.add(cosName); |
| } |
| } |
| resourceNames = getResourceNames(sourcePageResources, patternResourceNames); |
| } |
| } |
| |
| /** |
| * Provides a de-collisioned name. |
| * @param cn Submitted name. |
| * @return The submitted name if it is not already in this object's collection or an alternative it is. |
| * It is possible that the alternative is also in the collection. |
| */ |
| protected String getName(COSName cn) { |
| if (patternResourceNames.contains(cn)) { |
| return cn.getName() + patternKey; |
| } |
| if (resourceNames.contains(cn)) { |
| return cn.getName() + key; |
| } |
| return cn.getName(); |
| } |
| |
| /** |
| * Writes a name into a StringBuilder, appending a suffix if the name exists in this object's collection. |
| * @param sb The StringBuilder. |
| * @param cn The COSName. |
| * @throws IOException On IO exception. |
| */ |
| protected void writeName(StringBuilder sb, COSName cn) throws IOException { |
| ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
| cn.writePDF(bos); |
| String name = bos.toString(PDFDocument.ENCODING); |
| sb.append(name); |
| if (patternResourceNames.contains(cn)) { |
| sb.append(patternKey); |
| } |
| if (resourceNames.contains(cn)) { |
| sb.append(key); |
| } |
| } |
| |
| private List<COSName> getResourceNames(COSDictionary sourcePageResources, List<COSName> patternResourceNames) { |
| List<COSName> resourceNames = new ArrayList<COSName>(); |
| for (COSBase e : sourcePageResources.getValues()) { |
| if (e instanceof COSObject) { |
| e = ((COSObject) e).getObject(); |
| } |
| if (e instanceof COSDictionary) { |
| COSDictionary d = (COSDictionary) e; |
| for (COSName cosName : d.keySet()) { |
| if (!patternResourceNames.contains(cosName)) { |
| resourceNames.add(cosName); |
| } |
| } |
| } |
| } |
| return resourceNames; |
| } |
| |
| public boolean hasPatterns() { |
| return !patternResourceNames.isEmpty(); |
| } |
| } |