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Apache Commons Compress software defines an API for working with
compression and archive formats. These include: bzip2, gzip, pack200,
lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* 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.
*/
package org.apache.commons.compress.harmony.pack200;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.UncheckedIOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.commons.compress.harmony.pack200.AttributeDefinitionBands.AttributeDefinition;
import org.apache.commons.compress.utils.ParsingUtils;
import org.objectweb.asm.Label;
/**
* Sets of bands relating to a non-predefined attribute that has had a layout definition given to pack200 (e.g. via one of the -C, -M, -F or -D command line
* options)
*/
public class NewAttributeBands extends BandSet {
/**
* An AttributeLayoutElement is a part of an attribute layout and has one or more bands associated with it, which transmit the AttributeElement data for
* successive Attributes of this type.
*/
public interface AttributeLayoutElement {
void addAttributeToBand(NewAttribute attribute, InputStream inputStream);
void pack(OutputStream ouputStream) throws IOException, Pack200Exception;
void renumberBci(IntList bciRenumbering, Map labelsToOffsets);
}
public class Call extends LayoutElement {
private final int callableIndex;
private Callable callable;
public Call(final int callableIndex) {
this.callableIndex = callableIndex;
}
@Override
public void addAttributeToBand(final NewAttribute attribute, final InputStream inputStream) {
callable.addAttributeToBand(attribute, inputStream);
if (callableIndex < 1) {
callable.addBackwardsCall();
}
}
public Callable getCallable() {
return callable;
}
public int getCallableIndex() {
return callableIndex;
}
@Override
public void pack(final OutputStream outputStream) {
// do nothing here as pack will be called on the callable at another time
}
@Override
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
// do nothing here as renumberBci will be called on the callable at another time
}
public void setCallable(final Callable callable) {
this.callable = callable;
if (callableIndex < 1) {
callable.setBackwardsCallable();
}
}
}
public class Callable implements AttributeLayoutElement {
private final List body;
private boolean isBackwardsCallable;
private int backwardsCallableIndex;
public Callable(final List body) {
this.body = body;
}
@Override
public void addAttributeToBand(final NewAttribute attribute, final InputStream inputStream) {
for (final AttributeLayoutElement element : body) {
element.addAttributeToBand(attribute, inputStream);
}
}
public void addBackwardsCall() {
backwardsCallCounts[backwardsCallableIndex]++;
}
public List getBody() {
return body;
}
public boolean isBackwardsCallable() {
return isBackwardsCallable;
}
@Override
public void pack(final OutputStream outputStream) throws IOException, Pack200Exception {
for (final AttributeLayoutElement element : body) {
element.pack(outputStream);
}
}
@Override
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
for (final AttributeLayoutElement element : body) {
element.renumberBci(bciRenumbering, labelsToOffsets);
}
}
/**
* Tells this Callable that it is a backwards callable
*/
public void setBackwardsCallable() {
this.isBackwardsCallable = true;
}
public void setBackwardsCallableIndex(final int backwardsCallableIndex) {
this.backwardsCallableIndex = backwardsCallableIndex;
}
}
public class Integral extends LayoutElement {
private final String tag;
private final List band = new ArrayList();
private final BHSDCodec defaultCodec;
// used for bytecode offsets (OH and POH)
private Integral previousIntegral;
private int previousPValue;
public Integral(final String tag) {
this.tag = tag;
this.defaultCodec = getCodec(tag);
}
public Integral(final String tag, final Integral previousIntegral) {
this.tag = tag;
this.defaultCodec = getCodec(tag);
this.previousIntegral = previousIntegral;
}
@Override
public void addAttributeToBand(final NewAttribute attribute, final InputStream inputStream) {
Object val = null;
int value = 0;
if (tag.equals("B") || tag.equals("FB")) {
value = readInteger(1, inputStream) & 0xFF; // unsigned byte
} else if (tag.equals("SB")) {
value = readInteger(1, inputStream);
} else if (tag.equals("H") || tag.equals("FH")) {
value = readInteger(2, inputStream) & 0xFFFF; // unsigned short
} else if (tag.equals("SH")) {
value = readInteger(2, inputStream);
} else if (tag.equals("I") || tag.equals("FI") || tag.equals("SI")) {
value = readInteger(4, inputStream);
} else if (tag.equals("V") || tag.equals("FV") || tag.equals("SV")) {
// Not currently supported
} else if (tag.startsWith("PO") || tag.startsWith("OS")) {
final char uint_type = tag.substring(2).toCharArray()[0];
final int length = getLength(uint_type);
value = readInteger(length, inputStream);
value += previousIntegral.previousPValue;
val = attribute.getLabel(value);
previousPValue = value;
} else if (tag.startsWith("P")) {
final char uint_type = tag.substring(1).toCharArray()[0];
final int length = getLength(uint_type);
value = readInteger(length, inputStream);
val = attribute.getLabel(value);
previousPValue = value;
} else if (tag.startsWith("O")) {
final char uint_type = tag.substring(1).toCharArray()[0];
final int length = getLength(uint_type);
value = readInteger(length, inputStream);
value += previousIntegral.previousPValue;
val = attribute.getLabel(value);
previousPValue = value;
}
if (val == null) {
val = Integer.valueOf(value);
}
band.add(val);
}
public String getTag() {
return tag;
}
public int latestValue() {
return ((Integer) band.get(band.size() - 1)).intValue();
}
@Override
public void pack(final OutputStream outputStream) throws IOException, Pack200Exception {
PackingUtils.log("Writing new attribute bands...");
final byte[] encodedBand = encodeBandInt(tag, integerListToArray(band), defaultCodec);
outputStream.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from " + tag + "[" + band.size() + "]");
}
@Override
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
if (tag.startsWith("O") || tag.startsWith("PO")) {
renumberOffsetBci(previousIntegral.band, bciRenumbering, labelsToOffsets);
} else if (tag.startsWith("P")) {
for (int i = band.size() - 1; i >= 0; i--) {
final Object label = band.get(i);
if (label instanceof Integer) {
break;
}
if (label instanceof Label) {
band.remove(i);
final Integer bytecodeIndex = labelsToOffsets.get(label);
band.add(i, Integer.valueOf(bciRenumbering.get(bytecodeIndex.intValue())));
}
}
}
}
private void renumberOffsetBci(final List relative, final IntList bciRenumbering, final Map labelsToOffsets) {
for (int i = band.size() - 1; i >= 0; i--) {
final Object label = band.get(i);
if (label instanceof Integer) {
break;
}
if (label instanceof Label) {
band.remove(i);
final Integer bytecodeIndex = labelsToOffsets.get(label);
final Integer renumberedOffset = Integer.valueOf(bciRenumbering.get(bytecodeIndex.intValue()) - ((Integer) relative.get(i)).intValue());
band.add(i, renumberedOffset);
}
}
}
}
public abstract class LayoutElement implements AttributeLayoutElement {
protected int getLength(final char uint_type) {
int length = 0;
switch (uint_type) {
case 'B':
length = 1;
break;
case 'H':
length = 2;
break;
case 'I':
length = 4;
break;
case 'V':
length = 0;
break;
}
return length;
}
}
/**
* Constant Pool Reference
*/
public class Reference extends LayoutElement {
private final String tag;
private final List band = new ArrayList<>();
private final boolean nullsAllowed;
public Reference(final String tag) {
this.tag = tag;
nullsAllowed = tag.indexOf('N') != -1;
}
@Override
public void addAttributeToBand(final NewAttribute attribute, final InputStream inputStream) {
final int index = readInteger(4, inputStream);
if (tag.startsWith("RC")) { // Class
band.add(cpBands.getCPClass(attribute.readClass(index)));
} else if (tag.startsWith("RU")) { // UTF8 String
band.add(cpBands.getCPUtf8(attribute.readUTF8(index)));
} else if (tag.startsWith("RS")) { // Signature
band.add(cpBands.getCPSignature(attribute.readUTF8(index)));
} else { // Constant
band.add(cpBands.getConstant(attribute.readConst(index)));
}
// TODO method and field references
}
public String getTag() {
return tag;
}
@Override
public void pack(final OutputStream outputStream) throws IOException, Pack200Exception {
int[] ints;
if (nullsAllowed) {
ints = cpEntryOrNullListToArray(band);
} else {
ints = cpEntryListToArray(band);
}
final byte[] encodedBand = encodeBandInt(tag, ints, Codec.UNSIGNED5);
outputStream.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from " + tag + "[" + ints.length + "]");
}
@Override
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
// nothing to do here
}
}
/**
* A replication is an array of layout elements, with an associated count
*/
public class Replication extends LayoutElement {
private final Integral countElement;
private final List layoutElements = new ArrayList<>();
public Replication(final String tag, final String contents) throws IOException {
this.countElement = new Integral(tag);
final StringReader stream = new StringReader(contents);
LayoutElement e;
while ((e = readNextLayoutElement(stream)) != null) {
layoutElements.add(e);
}
}
@Override
public void addAttributeToBand(final NewAttribute attribute, final InputStream inputStream) {
countElement.addAttributeToBand(attribute, inputStream);
final int count = countElement.latestValue();
for (int i = 0; i < count; i++) {
for (final AttributeLayoutElement layoutElement : layoutElements) {
layoutElement.addAttributeToBand(attribute, inputStream);
}
}
}
public Integral getCountElement() {
return countElement;
}
public List getLayoutElements() {
return layoutElements;
}
@Override
public void pack(final OutputStream out) throws IOException, Pack200Exception {
countElement.pack(out);
for (final AttributeLayoutElement layoutElement : layoutElements) {
layoutElement.pack(out);
}
}
@Override
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
for (final AttributeLayoutElement layoutElement : layoutElements) {
layoutElement.renumberBci(bciRenumbering, labelsToOffsets);
}
}
}
/**
* A Union is a type of layout element where the tag value acts as a selector for one of the union cases
*/
public class Union extends LayoutElement {
private final Integral unionTag;
private final List unionCases;
private final List defaultCaseBody;
public Union(final String tag, final List unionCases, final List body) {
this.unionTag = new Integral(tag);
this.unionCases = unionCases;
this.defaultCaseBody = body;
}
@Override
public void addAttributeToBand(final NewAttribute attribute, final InputStream inputStream) {
unionTag.addAttributeToBand(attribute, inputStream);
final long tag = unionTag.latestValue();
boolean defaultCase = true;
for (final UnionCase unionCase : unionCases) {
if (unionCase.hasTag(tag)) {
defaultCase = false;
unionCase.addAttributeToBand(attribute, inputStream);
}
}
if (defaultCase) {
for (final LayoutElement layoutElement : defaultCaseBody) {
layoutElement.addAttributeToBand(attribute, inputStream);
}
}
}
public List getDefaultCaseBody() {
return defaultCaseBody;
}
public List getUnionCases() {
return unionCases;
}
public Integral getUnionTag() {
return unionTag;
}
@Override
public void pack(final OutputStream outputStream) throws IOException, Pack200Exception {
unionTag.pack(outputStream);
for (final UnionCase unionCase : unionCases) {
unionCase.pack(outputStream);
}
for (final LayoutElement element : defaultCaseBody) {
element.pack(outputStream);
}
}
@Override
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
for (final UnionCase unionCase : unionCases) {
unionCase.renumberBci(bciRenumbering, labelsToOffsets);
}
for (final LayoutElement element : defaultCaseBody) {
element.renumberBci(bciRenumbering, labelsToOffsets);
}
}
}
/**
* A Union case
*/
public class UnionCase extends LayoutElement {
private final List body;
private final List tags;
public UnionCase(final List tags) {
this.tags = tags;
this.body = Collections.EMPTY_LIST;
}
public UnionCase(final List tags, final List body) {
this.tags = tags;
this.body = body;
}
@Override
public void addAttributeToBand(final NewAttribute attribute, final InputStream inputStream) {
for (final LayoutElement element : body) {
element.addAttributeToBand(attribute, inputStream);
}
}
public List getBody() {
return body;
}
public boolean hasTag(final long l) {
return tags.contains(Integer.valueOf((int) l));
}
@Override
public void pack(final OutputStream outputStream) throws IOException, Pack200Exception {
for (final LayoutElement element : body) {
element.pack(outputStream);
}
}
@Override
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
for (final LayoutElement element : body) {
element.renumberBci(bciRenumbering, labelsToOffsets);
}
}
}
protected List attributeLayoutElements;
private int[] backwardsCallCounts;
private final CpBands cpBands;
private final AttributeDefinition def;
private boolean usedAtLeastOnce;
// used when parsing
private Integral lastPIntegral;
public NewAttributeBands(final int effort, final CpBands cpBands, final SegmentHeader header, final AttributeDefinition def) throws IOException {
super(effort, header);
this.def = def;
this.cpBands = cpBands;
parseLayout();
}
public void addAttribute(final NewAttribute attribute) {
usedAtLeastOnce = true;
final InputStream stream = new ByteArrayInputStream(attribute.getBytes());
for (final AttributeLayoutElement attributeLayoutElement : attributeLayoutElements) {
attributeLayoutElement.addAttributeToBand(attribute, stream);
}
}
public String getAttributeName() {
return def.name.getUnderlyingString();
}
/**
* Returns the {@link BHSDCodec} that should be used for the given layout element
*
* @param layoutElement
*/
private BHSDCodec getCodec(final String layoutElement) {
if (layoutElement.indexOf('O') >= 0) {
return Codec.BRANCH5;
}
if (layoutElement.indexOf('P') >= 0) {
return Codec.BCI5;
}
if (layoutElement.indexOf('S') >= 0 && layoutElement.indexOf("KS") < 0 //$NON-NLS-1$
&& layoutElement.indexOf("RS") < 0) { //$NON-NLS-1$
return Codec.SIGNED5;
}
if (layoutElement.indexOf('B') >= 0) {
return Codec.BYTE1;
}
return Codec.UNSIGNED5;
}
public int getFlagIndex() {
return def.index;
}
/**
* Utility method to get the contents of the given stream, up to the next {@code ]}, (ignoring pairs of brackets {@code [} and {@code ]})
*
* @param reader
* @return
* @throws IOException If an I/O error occurs.
*/
private StringReader getStreamUpToMatchingBracket(final StringReader reader) throws IOException {
final StringBuilder sb = new StringBuilder();
int foundBracket = -1;
while (foundBracket != 0) {
final int read = reader.read();
if (read == -1) {
break;
}
final char c = (char) read;
if (c == ']') {
foundBracket++;
}
if (c == '[') {
foundBracket--;
}
if (!(foundBracket == 0)) {
sb.append(c);
}
}
return new StringReader(sb.toString());
}
public boolean isUsedAtLeastOnce() {
return usedAtLeastOnce;
}
public int[] numBackwardsCalls() {
return backwardsCallCounts;
}
@Override
public void pack(final OutputStream outputStream) throws IOException, Pack200Exception {
for (final AttributeLayoutElement attributeLayoutElement : attributeLayoutElements) {
attributeLayoutElement.pack(outputStream);
}
}
private void parseLayout() throws IOException {
final String layout = def.layout.getUnderlyingString();
if (attributeLayoutElements == null) {
attributeLayoutElements = new ArrayList<>();
final StringReader reader = new StringReader(layout);
AttributeLayoutElement e;
while ((e = readNextAttributeElement(reader)) != null) {
attributeLayoutElements.add(e);
}
resolveCalls();
}
}
/**
* Read a 'body' section of the layout from the given stream
*
* @param reader
* @return List of LayoutElements
* @throws IOException If an I/O error occurs.
*/
private List readBody(final StringReader reader) throws IOException {
final List layoutElements = new ArrayList<>();
LayoutElement e;
while ((e = readNextLayoutElement(reader)) != null) {
layoutElements.add(e);
}
return layoutElements;
}
private int readInteger(final int i, final InputStream inputStream) {
int result = 0;
for (int j = 0; j < i; j++) {
try {
result = result << 8 | inputStream.read();
} catch (final IOException e) {
throw new UncheckedIOException("Error reading unknown attribute", e);
}
}
// use casting to preserve sign
if (i == 1) {
result = (byte) result;
}
if (i == 2) {
result = (short) result;
}
return result;
}
private AttributeLayoutElement readNextAttributeElement(final StringReader reader) throws IOException {
reader.mark(1);
final int next = reader.read();
if (next == -1) {
return null;
}
if (next == '[') {
return new Callable(readBody(getStreamUpToMatchingBracket(reader)));
}
reader.reset();
return readNextLayoutElement(reader);
}
private LayoutElement readNextLayoutElement(final StringReader reader) throws IOException {
final int nextChar = reader.read();
if (nextChar == -1) {
return null;
}
switch (nextChar) {
// Integrals
case 'B':
case 'H':
case 'I':
case 'V':
return new Integral(new String(new char[] { (char) nextChar }));
case 'S':
case 'F':
return new Integral(new String(new char[] { (char) nextChar, (char) reader.read() }));
case 'P':
reader.mark(1);
if (reader.read() != 'O') {
reader.reset();
lastPIntegral = new Integral("P" + (char) reader.read());
return lastPIntegral;
}
lastPIntegral = new Integral("PO" + (char) reader.read(), lastPIntegral);
return lastPIntegral;
case 'O':
reader.mark(1);
if (reader.read() != 'S') {
reader.reset();
return new Integral("O" + (char) reader.read(), lastPIntegral);
}
return new Integral("OS" + (char) reader.read(), lastPIntegral);
// Replication
case 'N':
final char uint_type = (char) reader.read();
reader.read(); // '['
final String str = readUpToMatchingBracket(reader);
return new Replication("" + uint_type, str);
// Union
case 'T':
String int_type = String.valueOf((char) reader.read());
if (int_type.equals("S")) {
int_type += (char) reader.read();
}
final List unionCases = new ArrayList<>();
UnionCase c;
while ((c = readNextUnionCase(reader)) != null) {
unionCases.add(c);
}
reader.read(); // '('
reader.read(); // ')'
reader.read(); // '['
List body = null;
reader.mark(1);
final char next = (char) reader.read();
if (next != ']') {
reader.reset();
body = readBody(getStreamUpToMatchingBracket(reader));
}
return new Union(int_type, unionCases, body);
// Call
case '(':
final int number = readNumber(reader).intValue();
reader.read(); // ')'
return new Call(number);
// Reference
case 'K':
case 'R':
final StringBuilder string = new StringBuilder("").append((char) nextChar).append((char) reader.read());
final char nxt = (char) reader.read();
string.append(nxt);
if (nxt == 'N') {
string.append((char) reader.read());
}
return new Reference(string.toString());
}
return null;
}
/**
* Read a UnionCase from the stream
*
* @param reader
* @return
* @throws IOException If an I/O error occurs.
*/
private UnionCase readNextUnionCase(final StringReader reader) throws IOException {
reader.mark(2);
reader.read(); // '('
final int next = reader.read();
char ch = (char) next;
if (ch == ')' || next == -1) {
reader.reset();
return null;
}
reader.reset();
reader.read(); // '('
final List tags = new ArrayList<>();
Integer nextTag;
do {
nextTag = readNumber(reader);
if (nextTag != null) {
tags.add(nextTag);
reader.read(); // ',' or ')'
}
} while (nextTag != null);
reader.read(); // '['
reader.mark(1);
ch = (char) reader.read();
if (ch == ']') {
return new UnionCase(tags);
}
reader.reset();
return new UnionCase(tags, readBody(getStreamUpToMatchingBracket(reader)));
}
/**
* Read a number from the stream and return it
*
* @param stream
* @return
* @throws IOException If an I/O error occurs.
*/
private Integer readNumber(final StringReader stream) throws IOException {
stream.mark(1);
final char first = (char) stream.read();
final boolean negative = first == '-';
if (!negative) {
stream.reset();
}
stream.mark(100);
int i;
int length = 0;
while ((i = stream.read()) != -1 && Character.isDigit((char) i)) {
length++;
}
stream.reset();
if (length == 0) {
return null;
}
final char[] digits = new char[length];
final int read = stream.read(digits);
if (read != digits.length) {
throw new IOException("Error reading from the input stream");
}
return ParsingUtils.parseIntValue((negative ? "-" : "") + new String(digits));
}
/**
* Utility method to get the contents of the given stream, up to the next ']', (ignoring pairs of brackets '[' and ']')
*
* @param reader
* @return
* @throws IOException If an I/O error occurs.
*/
private String readUpToMatchingBracket(final StringReader reader) throws IOException {
final StringBuilder sb = new StringBuilder();
int foundBracket = -1;
while (foundBracket != 0) {
final int read = reader.read();
if (read == -1) {
break;
}
final char c = (char) read;
if (c == ']') {
foundBracket++;
}
if (c == '[') {
foundBracket--;
}
if (!(foundBracket == 0)) {
sb.append(c);
}
}
return sb.toString();
}
/**
* Renumber any bytecode indexes or offsets as described in section 5.5.2 of the pack200 specification
*
* @param bciRenumbering TODO
* @param labelsToOffsets TODO
*/
public void renumberBci(final IntList bciRenumbering, final Map labelsToOffsets) {
for (final AttributeLayoutElement attributeLayoutElement : attributeLayoutElements) {
attributeLayoutElement.renumberBci(bciRenumbering, labelsToOffsets);
}
}
/**
* Resolve calls in the attribute layout and returns the number of backwards callables
*
* @param tokens - the attribute layout as a List of AttributeElements
*/
private void resolveCalls() {
for (int i = 0; i < attributeLayoutElements.size(); i++) {
final AttributeLayoutElement element = attributeLayoutElements.get(i);
if (element instanceof Callable) {
final Callable callable = (Callable) element;
final List body = callable.body; // Look for calls in the body
for (final LayoutElement layoutElement : body) {
// Set the callable for each call
resolveCallsForElement(i, callable, layoutElement);
}
}
}
int backwardsCallableIndex = 0;
for (final AttributeLayoutElement attributeLayoutElement : attributeLayoutElements) {
if (attributeLayoutElement instanceof Callable) {
final Callable callable = (Callable) attributeLayoutElement;
if (callable.isBackwardsCallable) {
callable.setBackwardsCallableIndex(backwardsCallableIndex);
backwardsCallableIndex++;
}
}
}
backwardsCallCounts = new int[backwardsCallableIndex];
}
private void resolveCallsForElement(final int i, final Callable currentCallable, final LayoutElement layoutElement) {
if (layoutElement instanceof Call) {
final Call call = (Call) layoutElement;
int index = call.callableIndex;
if (index == 0) { // Calls the parent callable
call.setCallable(currentCallable);
} else if (index > 0) { // Forwards call
for (int k = i + 1; k < attributeLayoutElements.size(); k++) {
final AttributeLayoutElement el = attributeLayoutElements.get(k);
if (el instanceof Callable) {
index--;
if (index == 0) {
call.setCallable((Callable) el);
break;
}
}
}
} else { // Backwards call
for (int k = i - 1; k >= 0; k--) {
final AttributeLayoutElement el = attributeLayoutElements.get(k);
if (el instanceof Callable) {
index++;
if (index == 0) {
call.setCallable((Callable) el);
break;
}
}
}
}
} else if (layoutElement instanceof Replication) {
final List children = ((Replication) layoutElement).layoutElements;
for (final LayoutElement child : children) {
resolveCallsForElement(i, currentCallable, child);
}
}
}
}