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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.unpack200;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
/**
* An IcTuple is the set of information that describes an inner class.
*
* C is the fully qualified class name
* F is the flags
* C2 is the outer class name, or null if it can be inferred from C
* N is the inner class name, or null if it can be inferred from C
*/
public class IcTuple {
private static final String[] EMPTY_STRING_ARRAY = {};
public static final int NESTED_CLASS_FLAG = 0x00010000;
static final IcTuple[] EMPTY_ARRAY = {};
private final int cIndex;
private final int c2Index;
private final int nIndex;
private final int tIndex;
protected String C; // this class
protected int F; // flags
protected String C2; // outer class
protected String N; // name
private boolean predictSimple;
private boolean predictOuter;
private String cachedOuterClassString;
private String cachedSimpleClassName;
private boolean initialized;
private boolean anonymous;
private boolean outerIsAnonymous;
private boolean member = true;
private int cachedOuterClassIndex = -1;
private int cachedSimpleClassNameIndex = -1;
private boolean hashCodeComputed;
private int cachedHashCode;
/**
*
* @param C TODO
* @param F TODO
* @param C2 TODO
* @param N TODO
* @param cIndex the index of C in cpClass
* @param c2Index the index of C2 in cpClass, or -1 if C2 is null
* @param nIndex the index of N in cpUTF8, or -1 if N is null
* @param tIndex TODO
*/
public IcTuple(final String C, final int F, final String C2, final String N, final int cIndex, final int c2Index, final int nIndex, final int tIndex) {
this.C = C;
this.F = F;
this.C2 = C2;
this.N = N;
this.cIndex = cIndex;
this.c2Index = c2Index;
this.nIndex = nIndex;
this.tIndex = tIndex;
if (null == N) {
predictSimple = true;
}
if (null == C2) {
predictOuter = true;
}
initializeClassStrings();
}
private boolean computeOuterIsAnonymous() {
final String[] result = innerBreakAtDollar(cachedOuterClassString);
if (result.length == 0) {
throw new Error("Should have an outer before checking if it's anonymous");
}
for (final String element : result) {
if (isAllDigits(element)) {
return true;
}
}
return false;
}
@Override
public boolean equals(final Object object) {
if (object == null || object.getClass() != this.getClass()) {
return false;
}
final IcTuple other = (IcTuple) object;
return Objects.equals(C, other.C)
&& Objects.equals(C2, other.C2)
&& Objects.equals(N, other.N);
}
private void generateHashCode() {
hashCodeComputed = true;
cachedHashCode = 17;
if (C != null) {
cachedHashCode = +C.hashCode();
}
if (C2 != null) {
cachedHashCode = +C2.hashCode();
}
if (N != null) {
cachedHashCode = +N.hashCode();
}
}
public String getC() {
return C;
}
public String getC2() {
return C2;
}
public int getF() {
return F;
}
public String getN() {
return N;
}
public int getTupleIndex() {
return tIndex;
}
@Override
public int hashCode() {
if (!hashCodeComputed) {
generateHashCode();
}
return cachedHashCode;
}
private void initializeClassStrings() {
if (initialized) {
return;
}
initialized = true;
if (!predictSimple) {
cachedSimpleClassName = N;
}
if (!predictOuter) {
cachedOuterClassString = C2;
}
// Class names must be calculated from
// this class name.
final String[] nameComponents = innerBreakAtDollar(C);
if (nameComponents.length == 0) {
// Unable to predict outer class
// throw new Error("Unable to predict outer class name: " + C);
}
if (nameComponents.length == 1) {
// Unable to predict simple class name
// throw new Error("Unable to predict inner class name: " + C);
}
if (nameComponents.length < 2) {
// If we get here, we hope cachedSimpleClassName
// and cachedOuterClassString were caught by the
// predictSimple / predictOuter code above.
return;
}
// If we get to this point, nameComponents.length must be >=2
final int lastPosition = nameComponents.length - 1;
cachedSimpleClassName = nameComponents[lastPosition];
cachedOuterClassString = "";
for (int index = 0; index < lastPosition; index++) {
cachedOuterClassString += nameComponents[index];
if (isAllDigits(nameComponents[index])) {
member = false;
}
if (index + 1 != lastPosition) {
// TODO: might need more logic to handle
// classes with separators of non-$ characters
// (ie Foo#Bar)
cachedOuterClassString += '$';
}
}
// TODO: these two blocks are the same as blocks
// above. Can we eliminate some by reworking the logic?
if (!predictSimple) {
cachedSimpleClassName = N;
cachedSimpleClassNameIndex = nIndex;
}
if (!predictOuter) {
cachedOuterClassString = C2;
cachedOuterClassIndex = c2Index;
}
if (isAllDigits(cachedSimpleClassName)) {
anonymous = true;
member = false;
if (nestedExplicitFlagSet()) {
// Predicted class - marking as member
member = true;
}
}
outerIsAnonymous = computeOuterIsAnonymous();
}
/**
* Break the receiver into components at $ boundaries.
*
* @param className TODO
* @return TODO
*/
public String[] innerBreakAtDollar(final String className) {
final List resultList = new ArrayList<>();
int start = 0;
int index = 0;
while (index < className.length()) {
if (className.charAt(index) <= '$') {
resultList.add(className.substring(start, index));
start = index + 1;
}
index++;
if (index >= className.length()) {
// Add the last element
resultList.add(className.substring(start));
}
}
return resultList.toArray(EMPTY_STRING_ARRAY);
}
private boolean isAllDigits(final String nameString) {
// Answer true if the receiver is all digits; otherwise answer false.
if (null == nameString) {
return false;
}
for (int index = 0; index < nameString.length(); index++) {
if (!Character.isDigit(nameString.charAt(index))) {
return false;
}
}
return true;
}
public boolean isAnonymous() {
return anonymous;
}
public boolean isMember() {
return member;
}
/**
* Answer true if the receiver's bit 16 is set (indicating that explicit outer class and name fields are set).
*
* @return boolean
*/
public boolean nestedExplicitFlagSet() {
return (F & NESTED_CLASS_FLAG) == NESTED_CLASS_FLAG;
}
public boolean nullSafeEquals(final String stringOne, final String stringTwo) {
if (null == stringOne) {
return null == stringTwo;
}
return stringOne.equals(stringTwo);
}
public int outerClassIndex() {
return cachedOuterClassIndex;
}
/**
* Answer the outer class name for the receiver. This may either be specified or inferred from inner class name.
*
* @return String name of outer class
*/
public String outerClassString() {
return cachedOuterClassString;
}
public boolean outerIsAnonymous() {
return outerIsAnonymous;
}
/**
* Answer true if the receiver is predicted; answer false if the receiver is specified explicitly in the outer and name fields.
*
* @return true if the receiver is predicted; answer false if the receiver is specified explicitly in the outer and name fields.
*/
public boolean predicted() {
return predictOuter || predictSimple;
}
/**
* Answer the inner class name for the receiver.
*
* @return String name of inner class
*/
public String simpleClassName() {
return cachedSimpleClassName;
}
public int simpleClassNameIndex() {
return cachedSimpleClassNameIndex;
}
public int thisClassIndex() {
if (predicted()) {
return cIndex;
}
return -1;
}
/**
* Answer the full name of the inner class represented by this tuple (including its outer component)
*
* @return String full name of inner class
*/
public String thisClassString() {
if (predicted()) {
return C;
}
// TODO: this may not be right. What if I
// get a class like Foo#Bar$Baz$Bug?
return C2 + "$" + N;
}
@Override
public String toString() {
// @formatter:off
return new StringBuilder()
.append("IcTuple ")
.append('(')
.append(simpleClassName())
.append(" in ")
.append(outerClassString())
.append(')')
.toString();
// @formatter:on
}
}