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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 java.util.Map;
- import java.util.SortedMap;
-
- import org.apache.commons.io.output.CountingOutputStream;
-
- /**
- * Class representing an "Nums" array object (for Number Trees).
- */
- public class PDFNumsArray extends PDFObject {
-
- /** Sorted Map holding the values of this array. */
- protected SortedMap<Integer, Object> map = new java.util.TreeMap<Integer, Object>();
-
- /**
- * Create a new, empty array object.
- * @param parent the object's parent if any
- */
- public PDFNumsArray(PDFObject parent) {
- super(parent);
- }
-
- /**
- * Returns the length of the array
- * @return the length of the array
- */
- public int length() {
- return this.map.size();
- }
-
- /**
- * Determines whether a value object should be converted to an indirect reference for inclusion in a Number Tree
- * array according to the PDF spec.
- * PDF1.0 - 1.2 - Spec is silent on this subject (as Number Trees don't exist).
- * PDF1.3 & 1.4 - Values must be indirect object refs.
- * PDF1.5 - Recommended: stream, dictionary, array, and string values be indirect object refs.
- * PDF1.6 - 2.0 - Stream values must be indirect object refs.
- * Recommended: dictionary, array, and string values be indirect object refs.
- * Method signals for values that must be, and those recommended to be indirect object refs.
- * @param obj The object to be considered.
- * @return True iff the object should be converted.
- */
- private boolean shouldConvertToRef(PDFObject obj) {
- boolean retval = false;
- if (getDocument() != null && getDocument().getPDFVersion() != null) {
- switch (getDocument().getPDFVersion()) {
- case V1_0: // fall-through
- case V1_1: // fall-through
- case V1_2:
- log.error("Number Tree used in PDF version " + getDocument().getPDFVersion());
- break;
- case V1_3: // fall-through
- case V1_4:
- retval = true;
- break;
- case V1_5: // fall-through
- case V1_6: // fall-through
- case V1_7: // fall-through
- case V2_0:
- if (obj instanceof PDFStream
- || obj instanceof PDFDictionary
- || obj instanceof PDFArray
- || obj instanceof PDFText) {
- retval = true;
- }
- break;
- default:
- log.error("Unrecognised PDF version " + getDocument().getPDFVersion());
- break;
- }
- }
- return retval;
- }
-
- /**
- * This method provides conformance with the different PDF specs which require or recommend different types be used
- * for Number Tree array values. Method indirects objects where indicated.
- * @param obj The object to be considered for indirection.
- * @return Either the object or a reference to the object.
- */
- private Object indirectIfReq(Object obj) {
- PDFDocument doc = getDocument();
- Object retval = obj;
- if (obj instanceof PDFObject) {
- PDFObject pdfObj = (PDFObject) obj;
- PDFObject parent = pdfObj.getParent();
- if (shouldConvertToRef(pdfObj)) {
- if (!pdfObj.hasObjectNumber()) { // Needs registering with the doc.
- pdfObj.setParent(null); // Can't register if it has a parent.
- pdfObj = doc.registerObject(pdfObj);
- if (parent != null) {
- pdfObj.setParent(parent); // Reinstate original parent.
- }
- }
- retval = pdfObj.makeReference();
- }
- }
- return retval;
- }
-
- /**
- * Sets an entry.
- * @param key the key of the value to set
- * @param obj the new value
- */
- public void put(Integer key, Object obj) {
- this.map.put(key, indirectIfReq(obj));
- }
-
- /**
- * Sets an entry.
- * @param key the key of the value to set
- * @param obj the new value
- */
- public void put(int key, Object obj) {
- put(Integer.valueOf(key), obj);
- }
-
- /**
- * Gets an entry.
- * @param key the key of requested value
- * @return the requested value
- */
- public Object get(Integer key) {
- return this.map.get(key);
- }
-
- /**
- * Gets an entry.
- * @param key the key of requested value
- * @return the requested value
- */
- public Object get(int key) {
- return get(Integer.valueOf(key));
- }
-
- /** {@inheritDoc} */
- @Override
- public int output(OutputStream stream) throws IOException {
- CountingOutputStream cout = new CountingOutputStream(stream);
- StringBuilder textBuffer = new StringBuilder(64);
- textBuffer.append('[');
- boolean first = true;
- for (Map.Entry<Integer, Object> entry : this.map.entrySet()) {
- if (!first) {
- textBuffer.append(" ");
- }
- first = false;
- formatObject(entry.getKey(), cout, textBuffer);
- textBuffer.append(" ");
- formatObject(entry.getValue(), cout, textBuffer);
- }
- textBuffer.append(']');
- PDFDocument.flushTextBuffer(textBuffer, cout);
- return cout.getCount();
- }
-
- }
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