org.apache.fop.pdf.PDFDictionary Maven / Gradle / Ivy
/*
* 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: PDFDictionary.java 1758773 2016-09-01 13:02:29Z ssteiner $ */
package org.apache.fop.pdf;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.io.output.CountingOutputStream;
/**
* Class representing a PDF dictionary object
*/
public class PDFDictionary extends PDFObject {
private boolean visited;
/**
* the entry map
*/
protected Map entries = new java.util.HashMap();
/**
* maintains the order of the entries added to the entry map. Whenever you modify
* "entries", always make sure you adjust this list accordingly.
*/
protected List order = new java.util.ArrayList();
/**
* Create a new dictionary object.
*/
public PDFDictionary() {
super();
}
/**
* Create a new dictionary object.
* @param parent the object's parent if any
*/
public PDFDictionary(PDFObject parent) {
super(parent);
}
/**
* Puts a new name/value pair.
* @param name the name
* @param value the value
*/
public void put(String name, Object value) {
if (value instanceof PDFObject) {
PDFObject pdfObj = (PDFObject)value;
if (!pdfObj.hasObjectNumber()) {
pdfObj.setParent(this);
}
}
if (!entries.containsKey(name)) {
this.order.add(name);
}
this.entries.put(name, value);
}
/**
* Puts a new name/value pair.
* @param name the name
* @param value the value
*/
public void put(String name, int value) {
if (!entries.containsKey(name)) {
this.order.add(name);
}
this.entries.put(name, value);
}
/**
* Returns the value given a name.
* @param name the name of the value
* @return the value or null, if there's no value with the given name.
*/
public Object get(String name) {
return this.entries.get(name);
}
/** {@inheritDoc} */
@Override
public int output(OutputStream stream) throws IOException {
CountingOutputStream cout = new CountingOutputStream(stream);
StringBuilder textBuffer = new StringBuilder(64);
writeDictionary(cout, textBuffer);
PDFDocument.flushTextBuffer(textBuffer, cout);
return cout.getCount();
}
/**
* Writes the contents of the dictionary to a StringBuffer.
* @param out the OutputStream (for binary content)
* @param textBuffer the text buffer for text output
* @throws IOException if an I/O error occurs
*/
protected void writeDictionary(OutputStream out, StringBuilder textBuffer) throws IOException {
textBuffer.append("<<");
boolean compact = (this.order.size() <= 2);
for (String key : this.order) {
if (compact) {
textBuffer.append(' ');
} else {
textBuffer.append("\n ");
}
textBuffer.append(PDFName.escapeName(key));
textBuffer.append(' ');
Object obj = this.entries.get(key);
formatObject(obj, out, textBuffer);
}
if (compact) {
textBuffer.append(' ');
} else {
textBuffer.append('\n');
}
textBuffer.append(">>");
}
@Override
public void getChildren(Set children) {
if (!visited) {
visited = true;
Map childrenMap = new HashMap(entries);
childrenMap.remove("Parent");
getChildren(childrenMap.values(), children);
visited = false;
}
}
public static void getChildren(Collection