com.itextpdf.text.pdf.PdfArray Maven / Gradle / Ivy
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*
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Copyright (c) 1998-2017 iText Group NV
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package com.itextpdf.text.pdf;
import com.itextpdf.text.pdf.internal.PdfIsoKeys;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
/**
* PdfArray is the PDF Array object.
*
* An array is a sequence of PDF objects. An array may contain a mixture of
* object types.
* An array is written as a left square bracket ([), followed by a sequence of
* objects, followed by a right square bracket (]).
* This object is described in the 'Portable Document Format Reference Manual
* version 1.7' section 3.2.5 (page 58).
*
* @see PdfObject
*/
public class PdfArray extends PdfObject implements Iterable {
// CLASS VARIABLES
/** this is the actual array of PdfObjects */
protected ArrayList arrayList;
// constructors
/**
* Constructs an empty PdfArray-object.
*/
public PdfArray() {
super(ARRAY);
arrayList = new ArrayList();
}
public PdfArray(int capacity) {
super(ARRAY);
arrayList = new ArrayList(capacity);
}
/**
* Constructs an PdfArray-object, containing 1
* PdfObject.
*
* @param object a PdfObject that has to be added to the array
*/
public PdfArray(final PdfObject object) {
super(ARRAY);
arrayList = new ArrayList();
arrayList.add(object);
}
/**
* Constructs a PdfArray-object, containing all
* float values in a specified array.
*
* The float values are internally converted to
* PdfNumber objects.
*
* @param values an array of float values to be added
*/
public PdfArray(final float values[]) {
super(ARRAY);
arrayList = new ArrayList();
add(values);
}
/**
* Constructs a PdfArray-object, containing all
* int values in a specified array.
*
* The int values are internally converted to
* PdfNumber objects.
*
* @param values an array of int values to be added
*/
public PdfArray(final int values[]) {
super(ARRAY);
arrayList = new ArrayList();
add(values);
}
/**
* Constructs a PdfArray, containing all elements of a
* specified ArrayList.
*
* @param l an ArrayList with PdfObjects to be
* added to the array
* @throws ClassCastException if the ArrayList contains
* something that isn't a PdfObject
* @since 2.1.3
*/
public PdfArray(final List l) {
this();
for (PdfObject element : l)
add(element);
}
/**
* Constructs an PdfArray-object, containing all
* PdfObjects in a specified PdfArray.
*
* @param array a PdfArray to be added to the array
*/
public PdfArray(final PdfArray array) {
super(ARRAY);
arrayList = new ArrayList(array.arrayList);
}
// METHODS OVERRIDING SOME PDFOBJECT METHODS
/**
* Writes the PDF representation of this PdfArray as an array
* of byte to the specified OutputStream.
*
* @param writer for backwards compatibility
* @param os the OutputStream to write the bytes to.
*/
@Override
public void toPdf(final PdfWriter writer, final OutputStream os) throws IOException {
PdfWriter.checkPdfIsoConformance(writer, PdfIsoKeys.PDFISOKEY_OBJECT, this);
os.write('[');
Iterator i = arrayList.iterator();
PdfObject object;
int type = 0;
if (i.hasNext()) {
object = i.next();
if (object == null)
object = PdfNull.PDFNULL;
object.toPdf(writer, os);
}
while (i.hasNext()) {
object = i.next();
if (object == null)
object = PdfNull.PDFNULL;
type = object.type();
if (type != PdfObject.ARRAY && type != PdfObject.DICTIONARY && type != PdfObject.NAME && type != PdfObject.STRING)
os.write(' ');
object.toPdf(writer, os);
}
os.write(']');
}
/**
* Returns a string representation of this PdfArray.
*
* The string representation consists of a list of all
* PdfObjects contained in this PdfArray,
* enclosed in square brackets ("[]"). Adjacent elements are separated
* by the characters ", " (comma and space).
*
* @return the string representation of this PdfArray
*/
@Override
public String toString() {
return arrayList.toString();
}
// ARRAY CONTENT METHODS
/**
* Overwrites a specified location of the array, returning the previous
* value
*
* @param idx The index of the element to be overwritten
* @param obj new value for the specified index
* @throws IndexOutOfBoundsException if the specified position doesn't exist
* @return the previous value
* @since 2.1.5
*/
public PdfObject set(final int idx, final PdfObject obj) {
return arrayList.set(idx, obj);
}
/**
* Remove the element at the specified position from the array.
*
* Shifts any subsequent elements to the left (subtracts one from their
* indices).
*
* @param idx The index of the element to be removed.
* @throws IndexOutOfBoundsException the specified position doesn't exist
* @since 2.1.5
*/
public PdfObject remove(final int idx) {
return arrayList.remove(idx);
}
/**
* Get the internal arrayList for this PdfArray. Not Recommended.
*
* @deprecated
* @return the internal ArrayList. Naughty Naughty.
*/
@Deprecated
public ArrayList getArrayList() {
return arrayList;
}
/**
* Returns the number of entries in the array.
*
* @return the size of the ArrayList
*/
public int size() {
return arrayList.size();
}
/**
* Returns true if the array is empty.
*
* @return true if the array is empty
* @since 2.1.5
*/
public boolean isEmpty() {
return arrayList.isEmpty();
}
/**
* Adds a PdfObject to the end of the PdfArray.
*
* The PdfObject will be the last element.
*
* @param object PdfObject to add
* @return always true
*/
public boolean add(final PdfObject object) {
return arrayList.add(object);
}
/**
* Adds an array of float values to end of the
* PdfArray.
*
* The values will be the last elements.
* The float values are internally converted to
* PdfNumber objects.
*
* @param values An array of float values to add
* @return always true
*/
public boolean add(final float values[]) {
for (int k = 0; k < values.length; ++k)
arrayList.add(new PdfNumber(values[k]));
return true;
}
/**
* Adds an array of int values to end of the PdfArray.
*
* The values will be the last elements.
* The int values are internally converted to
* PdfNumber objects.
*
* @param values An array of int values to add
* @return always true
*/
public boolean add(final int values[]) {
for (int k = 0; k < values.length; ++k)
arrayList.add(new PdfNumber(values[k]));
return true;
}
/**
* Inserts the specified element at the specified position.
*
* Shifts the element currently at that position (if any) and
* any subsequent elements to the right (adds one to their indices).
*
* @param index The index at which the specified element is to be inserted
* @param element The element to be inserted
* @throws IndexOutOfBoundsException if the specified index is larger than the
* last position currently set, plus 1.
* @since 2.1.5
*/
public void add(final int index, final PdfObject element) {
arrayList.add(index, element);
}
/**
* Inserts a PdfObject at the beginning of the
* PdfArray.
*
* The PdfObject will be the first element, any other elements
* will be shifted to the right (adds one to their indices).
*
* @param object The PdfObject to add
*/
public void addFirst(final PdfObject object) {
arrayList.add(0, object);
}
/**
* Checks if the PdfArray already contains a certain
* PdfObject.
*
* @param object The PdfObject to check
* @return true
*/
public boolean contains(final PdfObject object) {
return arrayList.contains(object);
}
/**
* Returns the list iterator for the array.
*
* @return a ListIterator
*/
public ListIterator listIterator() {
return arrayList.listIterator();
}
/**
* Returns the PdfObject with the specified index.
*
* A possible indirect references is not resolved, so the returned
* PdfObject may be either a direct object or an indirect
* reference, depending on how the object is stored in the
* PdfArray.
*
* @param idx The index of the PdfObject to be returned
* @return A PdfObject
*/
public PdfObject getPdfObject(final int idx) {
return arrayList.get(idx);
}
/**
* Returns the PdfObject with the specified index, resolving
* a possible indirect reference to a direct object.
*
* Thus this method will never return a PdfIndirectReference
* object.
*
* @param idx The index of the PdfObject to be returned
* @return A direct PdfObject or null
*/
public PdfObject getDirectObject(final int idx) {
return PdfReader.getPdfObject(getPdfObject(idx));
}
// DOWNCASTING GETTERS
// @author Mark A Storer (2/17/06)
/**
* Returns a PdfObject as a PdfDictionary,
* resolving indirect references.
*
* The object corresponding to the specified index is retrieved and
* resolvedto a direct object.
* If it is a PdfDictionary, it is cast down and returned as such.
* Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfDictionary object,
* or null
*/
public PdfDictionary getAsDict(final int idx) {
PdfDictionary dict = null;
PdfObject orig = getDirectObject(idx);
if (orig != null && orig.isDictionary())
dict = (PdfDictionary) orig;
return dict;
}
/**
* Returns a PdfObject as a PdfArray,
* resolving indirect references.
*
* The object corresponding to the specified index is retrieved and
* resolved to a direct object.
* If it is a PdfArray, it is cast down and returned as such.
* Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfArray object,
* or null
*/
public PdfArray getAsArray(final int idx) {
PdfArray array = null;
PdfObject orig = getDirectObject(idx);
if (orig != null && orig.isArray())
array = (PdfArray) orig;
return array;
}
/**
* Returns a PdfObject as a PdfStream,
* resolving indirect references.
*
* The object corresponding to the specified index is retrieved and
* resolved to a direct object.
* If it is a PdfStream, it is cast down and returned as such.
* Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfStream object,
* or null
*/
public PdfStream getAsStream(final int idx) {
PdfStream stream = null;
PdfObject orig = getDirectObject(idx);
if (orig != null && orig.isStream())
stream = (PdfStream) orig;
return stream;
}
/**
* Returns a PdfObject as a PdfString,
* resolving indirect references.
*
* The object corresponding to the specified index is retrieved and
* resolved to a direct object.
* If it is a PdfString, it is cast down and returned as such.
* Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfString object,
* or null
*/
public PdfString getAsString(final int idx) {
PdfString string = null;
PdfObject orig = getDirectObject(idx);
if (orig != null && orig.isString())
string = (PdfString) orig;
return string;
}
/**
* Returns a PdfObject as a PdfNumber,
* resolving indirect references.
*
* The object corresponding to the specified index is retrieved and
* resolved to a direct object.
* If it is a PdfNumber, it is cast down and returned as such.
* Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfNumber object,
* or null
*/
public PdfNumber getAsNumber(final int idx) {
PdfNumber number = null;
PdfObject orig = getDirectObject(idx);
if (orig != null && orig.isNumber())
number = (PdfNumber) orig;
return number;
}
/**
* Returns a PdfObject as a PdfName,
* resolving indirect references.
*
* The object corresponding to the specified index is retrieved and
* resolved to a direct object.
* If it is a PdfName, it is cast down and returned as such.
* Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfName object,
* or null
*/
public PdfName getAsName(final int idx) {
PdfName name = null;
PdfObject orig = getDirectObject(idx);
if (orig != null && orig.isName())
name = (PdfName) orig;
return name;
}
/**
* Returns a PdfObject as a PdfBoolean,
* resolving indirect references.
*
* The object corresponding to the specified index is retrieved and
* resolved to a direct object.
* If it is a PdfBoolean, it is cast down and returned as
* such. Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfBoolean object,
* or null
*/
public PdfBoolean getAsBoolean(final int idx) {
PdfBoolean bool = null;
PdfObject orig = getDirectObject(idx);
if (orig != null && orig.isBoolean())
bool = (PdfBoolean) orig;
return bool;
}
/**
* Returns a PdfObject as a PdfIndirectReference.
*
* The object corresponding to the specified index is retrieved.
* If it is a PdfIndirectReference, it is cast down and
* returned as such. Otherwise null is returned.
*
* @param idx The index of the PdfObject to be returned
* @return the corresponding PdfIndirectReference object,
* or null
*/
public PdfIndirectReference getAsIndirectObject(final int idx) {
PdfIndirectReference ref = null;
PdfObject orig = getPdfObject(idx); // not getDirect this time.
if (orig instanceof PdfIndirectReference)
ref = (PdfIndirectReference) orig;
return ref;
}
/**
* @return an iterator that iterates over the {@link PdfObject}s in this PdfArray.
*/
public Iterator iterator() {
return arrayList.iterator();
}
/**
*
* @return this PdfArray's values as a long[]
* @since 5.3.5
*/
public long[] asLongArray(){
long[] rslt = new long[size()];
for (int k = 0; k < rslt.length; ++k) {
rslt[k] = getAsNumber(k).longValue();
}
return rslt;
}
/**
*
* @return this PdfArray's values as a double[]
* @since 5.5.6
*/
public double[] asDoubleArray() {
double[] rslt = new double[size()];
for (int k = 0; k < rslt.length; ++k) {
rslt[k] = getAsNumber(k).doubleValue();
}
return rslt;
}
}