/*
* $Id: PdfDictionary.java 4806 2011-04-13 09:20:24Z redlab_b $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2011 1T3XT BVBA
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
* 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
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*/
package com.itextpdf.text.pdf;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Set;
/**
* <CODE>PdfDictionary</CODE> is the Pdf dictionary object.
* <P>
* A dictionary is an associative table containing pairs of objects.
* The first element of each pair is called the <I>key</I> and the second
* element is called the <I>value</I>.
* Unlike dictionaries in the PostScript language, a key must be a
* <CODE>PdfName</CODE>.
* A value can be any kind of <CODE>PdfObject</CODE>, including a dictionary.
* A dictionary is generally used to collect and tie together the attributes
* of a complex object, with each key-value pair specifying the name and value
* of an attribute.<BR>
* A dictionary is represented by two left angle brackets (<<), followed by a
* sequence of key-value pairs, followed by two right angle brackets (>>).<BR>
* This object is described in the 'Portable Document Format Reference Manual
* version 1.7' section 3.2.6 (page 59-60).
* <P>
*
* @see PdfObject
* @see PdfName
* @see BadPdfFormatException
*/
public class PdfDictionary extends PdfObject {
// CONSTANTS
/** This is a possible type of dictionary */
public static final PdfName FONT = PdfName.FONT;
/** This is a possible type of dictionary */
public static final PdfName OUTLINES = PdfName.OUTLINES;
/** This is a possible type of dictionary */
public static final PdfName PAGE = PdfName.PAGE;
/** This is a possible type of dictionary */
public static final PdfName PAGES = PdfName.PAGES;
/** This is a possible type of dictionary */
public static final PdfName CATALOG = PdfName.CATALOG;
// CLASS VARIABLES
/** This is the type of this dictionary */
private PdfName dictionaryType = null;
/** This is the hashmap that contains all the values and keys of the dictionary */
protected HashMap<PdfName, PdfObject> hashMap;
// CONSTRUCTORS
/**
* Constructs an empty <CODE>PdfDictionary</CODE>-object.
*/
public PdfDictionary() {
super(DICTIONARY);
hashMap = new HashMap<PdfName, PdfObject>();
}
/**
* Constructs a <CODE>PdfDictionary</CODE>-object of a certain type.
*
* @param type a <CODE>PdfName</CODE>
*/
public PdfDictionary(final PdfName type) {
this();
dictionaryType = type;
put(PdfName.TYPE, dictionaryType);
}
// METHODS OVERRIDING SOME PDFOBJECT METHODS
/**
* Writes the PDF representation of this <CODE>PdfDictionary</CODE> as an
* array of <CODE>byte</CODE> to the given <CODE>OutputStream</CODE>.
*
* @param writer for backwards compatibility
* @param os the <CODE>OutputStream</CODE> to write the bytes to.
* @throws IOException
*/
@Override
public void toPdf(final PdfWriter writer, final OutputStream os) throws IOException {
os.write('<');
os.write('<');
// loop over all the object-pairs in the HashMap
PdfObject value;
int type = 0;
for (Entry<PdfName, PdfObject> e: hashMap.entrySet()) {
e.getKey().toPdf(writer, os);
value = e.getValue();
type = value.type();
if (type != PdfObject.ARRAY && type != PdfObject.DICTIONARY && type != PdfObject.NAME && type != PdfObject.STRING)
os.write(' ');
value.toPdf(writer, os);
}
os.write('>');
os.write('>');
}
/**
* Returns a string representation of this <CODE>PdfDictionary</CODE>.
*
* The string doesn't contain any of the content of this dictionary.
* Rather the string "dictionary" is returned, possibly followed by the
* type of this <CODE>PdfDictionary</CODE>, if set.
*
* @return the string representation of this <CODE>PdfDictionary</CODE>
* @see com.itextpdf.text.pdf.PdfObject#toString()
*/
@Override
public String toString() {
if (get(PdfName.TYPE) == null)
return "Dictionary";
return "Dictionary of type: " + get(PdfName.TYPE);
}
// DICTIONARY CONTENT METHODS
/**
* Associates the specified <CODE>PdfObject</CODE> as <VAR>value</VAR> with
* the specified <CODE>PdfName</CODE> as <VAR>key</VAR> in this map.
*
* If the map previously contained a mapping for this <VAR>key</VAR>, the
* old <VAR>value</VAR> is replaced. If the <VAR>value</VAR> is
* <CODE>null</CODE> or <CODE>PdfNull</CODE> the key is deleted.
*
* @param key a <CODE>PdfName</CODE>
* @param object the <CODE>PdfObject</CODE> to be associated with the
* <VAR>key</VAR>
*/
public void put(final PdfName key, final PdfObject object) {
if (object == null || object.isNull())
hashMap.remove(key);
else
hashMap.put(key, object);
}
/**
* Associates the specified <CODE>PdfObject</CODE> as value to the
* specified <CODE>PdfName</CODE> as key in this map.
*
* If the <VAR>value</VAR> is a <CODE>PdfNull</CODE>, it is treated just as
* any other <CODE>PdfObject</CODE>. If the <VAR>value</VAR> is
* <CODE>null</CODE> however nothing is done.
*
* @param key a <CODE>PdfName</CODE>
* @param value the <CODE>PdfObject</CODE> to be associated to the
* <VAR>key</VAR>
*/
public void putEx(final PdfName key, final PdfObject value) {
if (value == null)
return;
put(key, value);
}
/**
* Copies all of the mappings from the specified <CODE>PdfDictionary</CODE>
* to this <CODE>PdfDictionary</CODE>.
*
* These mappings will replace any mappings previously contained in this
* <CODE>PdfDictionary</CODE>.
*
* @param dic The <CODE>PdfDictionary</CODE> with the mappings to be
* copied over
*/
public void putAll(final PdfDictionary dic) {
hashMap.putAll(dic.hashMap);
}
/**
* Removes a <CODE>PdfObject</CODE> and its <VAR>key</VAR> from the
* <CODE>PdfDictionary</CODE>.
*
* @param key a <CODE>PdfName</CODE>
*/
public void remove(final PdfName key) {
hashMap.remove(key);
}
/**
* Removes all the <CODE>PdfObject</CODE>s and its <VAR>key</VAR>s from the
* <CODE>PdfDictionary</CODE>.
* @since 5.0.2
*/
public void clear() {
hashMap.clear();
}
/**
* Returns the <CODE>PdfObject</CODE> associated to the specified
* <VAR>key</VAR>.
*
* @param key a <CODE>PdfName</CODE>
* @return the </CODE>PdfObject</CODE> previously associated to the
* <VAR>key</VAR>
*/
public PdfObject get(final PdfName key) {
return hashMap.get(key);
}
/**
* Returns the <CODE>PdfObject</CODE> associated to the specified
* <VAR>key</VAR>, resolving a possible indirect reference to a direct
* object.
*
* This method will never return a <CODE>PdfIndirectReference</CODE>
* object.
*
* @param key A key for the <CODE>PdfObject</CODE> to be returned
* @return A direct <CODE>PdfObject</CODE> or <CODE>null</CODE>
*/
public PdfObject getDirectObject(final PdfName key) {
return PdfReader.getPdfObject(get(key));
}
/**
* Get all keys that are set.
*
* @return <CODE>true</CODE> if it is, otherwise <CODE>false</CODE>.
*/
public Set<PdfName> getKeys() {
return hashMap.keySet();
}
/**
* Returns the number of <VAR>key</VAR>-<VAR>value</VAR> mappings in this
* <CODE>PdfDictionary</CODE>.
*
* @return the number of <VAR>key</VAR>-<VAR>value</VAR> mappings in this
* <CODE>PdfDictionary</CODE>.
*/
public int size() {
return hashMap.size();
}
/**
* Returns <CODE>true</CODE> if this <CODE>PdfDictionary</CODE> contains a
* mapping for the specified <VAR>key</VAR>.
*
* @return <CODE>true</CODE> if the key is set, otherwise <CODE>false</CODE>.
*/
public boolean contains(final PdfName key) {
return hashMap.containsKey(key);
}
// DICTIONARY TYPE METHODS
/**
* Checks if a <CODE>Dictionary</CODE> is of the type FONT.
*
* @return <CODE>true</CODE> if it is, otherwise <CODE>false</CODE>.
*/
public boolean isFont() {
return FONT.equals(dictionaryType);
}
/**
* Checks if a <CODE>Dictionary</CODE> is of the type PAGE.
*
* @return <CODE>true</CODE> if it is, otherwise <CODE>false</CODE>.
*/
public boolean isPage() {
return PAGE.equals(dictionaryType);
}
/**
* Checks if a <CODE>Dictionary</CODE> is of the type PAGES.
*
* @return <CODE>true</CODE> if it is, otherwise <CODE>false</CODE>.
*/
public boolean isPages() {
return PAGES.equals(dictionaryType);
}
/**
* Checks if a <CODE>Dictionary</CODE> is of the type CATALOG.
*
* @return <CODE>true</CODE> if it is, otherwise <CODE>false</CODE>.
*/
public boolean isCatalog() {
return CATALOG.equals(dictionaryType);
}
/**
* Checks if a <CODE>Dictionary</CODE> is of the type OUTLINES.
*
* @return <CODE>true</CODE> if it is, otherwise <CODE>false</CODE>.
*/
public boolean isOutlineTree() {
return OUTLINES.equals(dictionaryType);
}
// OTHER METHODS
public void merge(final PdfDictionary other) {
hashMap.putAll(other.hashMap);
}
public void mergeDifferent(final PdfDictionary other) {
for (PdfName key : other.hashMap.keySet()) {
if (!hashMap.containsKey(key))
hashMap.put(key, other.hashMap.get(key));
}
}
// DOWNCASTING GETTERS
// @author Mark A Storer (2/17/06)
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfDictionary</CODE>,
* resolving indirect references.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* and resolved to a direct object.
* If it is a <CODE>PdfDictionary</CODE>, it is cast down and returned as
* such. Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfDictionary</CODE> object,
* or <CODE>null</CODE>
*/
public PdfDictionary getAsDict(final PdfName key) {
PdfDictionary dict = null;
PdfObject orig = getDirectObject(key);
if (orig != null && orig.isDictionary())
dict = (PdfDictionary) orig;
return dict;
}
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfArray</CODE>,
* resolving indirect references.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* and resolved to a direct object.
* If it is a <CODE>PdfArray</CODE>, it is cast down and returned as such.
* Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfArray</CODE> object,
* or <CODE>null</CODE>
*/
public PdfArray getAsArray(final PdfName key) {
PdfArray array = null;
PdfObject orig = getDirectObject(key);
if (orig != null && orig.isArray())
array = (PdfArray) orig;
return array;
}
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfStream</CODE>,
* resolving indirect references.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* and resolved to a direct object.
* If it is a <CODE>PdfStream</CODE>, it is cast down and returned as such.
* Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfStream</CODE> object,
* or <CODE>null</CODE>
*/
public PdfStream getAsStream(final PdfName key) {
PdfStream stream = null;
PdfObject orig = getDirectObject(key);
if (orig != null && orig.isStream())
stream = (PdfStream) orig;
return stream;
}
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfString</CODE>,
* resolving indirect references.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* and resolved to a direct object.
* If it is a <CODE>PdfString</CODE>, it is cast down and returned as such.
* Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfString</CODE> object,
* or <CODE>null</CODE>
*/
public PdfString getAsString(final PdfName key) {
PdfString string = null;
PdfObject orig = getDirectObject(key);
if (orig != null && orig.isString())
string = (PdfString) orig;
return string;
}
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfNumber</CODE>,
* resolving indirect references.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* and resolved to a direct object.
* If it is a <CODE>PdfNumber</CODE>, it is cast down and returned as such.
* Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfNumber</CODE> object,
* or <CODE>null</CODE>
*/
public PdfNumber getAsNumber(final PdfName key) {
PdfNumber number = null;
PdfObject orig = getDirectObject(key);
if (orig != null && orig.isNumber())
number = (PdfNumber) orig;
return number;
}
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfName</CODE>,
* resolving indirect references.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* and resolved to a direct object.
* If it is a <CODE>PdfName</CODE>, it is cast down and returned as such.
* Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfName</CODE> object,
* or <CODE>null</CODE>
*/
public PdfName getAsName(final PdfName key) {
PdfName name = null;
PdfObject orig = getDirectObject(key);
if (orig != null && orig.isName())
name = (PdfName) orig;
return name;
}
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfBoolean</CODE>,
* resolving indirect references.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* and resolved to a direct object.
* If it is a <CODE>PdfBoolean</CODE>, it is cast down and returned as such.
* Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfBoolean</CODE> object,
* or <CODE>null</CODE>
*/
public PdfBoolean getAsBoolean(final PdfName key) {
PdfBoolean bool = null;
PdfObject orig = getDirectObject(key);
if (orig != null && orig.isBoolean())
bool = (PdfBoolean)orig;
return bool;
}
/**
* Returns a <CODE>PdfObject</CODE> as a <CODE>PdfIndirectReference</CODE>.
*
* The object associated with the <CODE>PdfName</CODE> given is retrieved
* If it is a <CODE>PdfIndirectReference</CODE>, it is cast down and returned
* as such. Otherwise <CODE>null</CODE> is returned.
*
* @param key A <CODE>PdfName</CODE>
* @return the associated <CODE>PdfIndirectReference</CODE> object,
* or <CODE>null</CODE>
*/
public PdfIndirectReference getAsIndirectObject(final PdfName key) {
PdfIndirectReference ref = null;
PdfObject orig = get(key); // not getDirect this time.
if (orig != null && orig.isIndirect())
ref = (PdfIndirectReference) orig;
return ref;
}
}
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