fish.payara.micro.boot.loader.jar.JarFileEntries Maven / Gradle / Ivy
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/*
* Copyright 2012-2016 the original author or authors.
*
* Licensed 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 fish.payara.micro.boot.loader.jar;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.zip.ZipEntry;
import fish.payara.micro.boot.loader.data.RandomAccessData;
import fish.payara.micro.boot.loader.data.RandomAccessData.ResourceAccess;
/**
* Provides access to entries from a {@link JarFile}. In order to reduce memory
* consumption entry details are stored using int arrays. The {@code hashCodes} array
* stores the hash code of the entry name, the {@code centralDirectoryOffsets} provides
* the offset to the central directory record and {@code positions} provides the original
* order position of the entry. The arrays are stored in hashCode order so that a binary
* search can be used to find a name.
*
* A typical Spring Boot application will have somewhere in the region of 10,500 entries
* which should consume about 122K.
*
* @author Phillip Webb
*/
class JarFileEntries implements CentralDirectoryVisitor, Iterable {
private static final long LOCAL_FILE_HEADER_SIZE = 30;
private static final String SLASH = "/";
private static final String NO_SUFFIX = "";
protected static final int ENTRY_CACHE_SIZE = 25;
private final JarFile jarFile;
private final JarEntryFilter filter;
private RandomAccessData centralDirectoryData;
private int size;
private int[] hashCodes;
private int[] centralDirectoryOffsets;
private int[] positions;
private final Map entriesCache = Collections
.synchronizedMap(new LinkedHashMap(16, 0.75f, true) {
@Override
protected boolean removeEldestEntry(
Map.Entry eldest) {
if (JarFileEntries.this.jarFile.isSigned()) {
return false;
}
return size() >= ENTRY_CACHE_SIZE;
}
});
JarFileEntries(JarFile jarFile, JarEntryFilter filter) {
this.jarFile = jarFile;
this.filter = filter;
}
@Override
public void visitStart(CentralDirectoryEndRecord endRecord,
RandomAccessData centralDirectoryData) {
int maxSize = endRecord.getNumberOfRecords();
this.centralDirectoryData = centralDirectoryData;
this.hashCodes = new int[maxSize];
this.centralDirectoryOffsets = new int[maxSize];
this.positions = new int[maxSize];
}
@Override
public void visitFileHeader(CentralDirectoryFileHeader fileHeader, int dataOffset) {
AsciiBytes name = applyFilter(fileHeader.getName());
if (name != null) {
add(name, fileHeader, dataOffset);
}
}
private void add(AsciiBytes name, CentralDirectoryFileHeader fileHeader,
int dataOffset) {
this.hashCodes[this.size] = name.hashCode();
this.centralDirectoryOffsets[this.size] = dataOffset;
this.positions[this.size] = this.size;
this.size++;
}
@Override
public void visitEnd() {
sort(0, this.size - 1);
int[] positions = this.positions;
this.positions = new int[positions.length];
for (int i = 0; i < this.size; i++) {
this.positions[positions[i]] = i;
}
}
private void sort(int left, int right) {
// Quick sort algorithm, uses hashCodes as the source but sorts all arrays
if (left < right) {
int pivot = this.hashCodes[left + (right - left) / 2];
int i = left;
int j = right;
while (i <= j) {
while (this.hashCodes[i] < pivot) {
i++;
}
while (this.hashCodes[j] > pivot) {
j--;
}
if (i <= j) {
swap(i, j);
i++;
j--;
}
}
if (left < j) {
sort(left, j);
}
if (right > i) {
sort(i, right);
}
}
}
private void swap(int i, int j) {
swap(this.hashCodes, i, j);
swap(this.centralDirectoryOffsets, i, j);
swap(this.positions, i, j);
}
private void swap(int[] array, int i, int j) {
int temp = array[i];
array[i] = array[j];
array[j] = temp;
}
@Override
public Iterator iterator() {
return new EntryIterator();
}
public boolean containsEntry(String name) {
return getEntry(name, FileHeader.class, true) != null;
}
public JarEntry getEntry(String name) {
return getEntry(name, JarEntry.class, true);
}
public InputStream getInputStream(String name, ResourceAccess access)
throws IOException {
FileHeader entry = getEntry(name, FileHeader.class, false);
return getInputStream(entry, access);
}
public InputStream getInputStream(FileHeader entry, ResourceAccess access)
throws IOException {
if (entry == null) {
return null;
}
InputStream inputStream = getEntryData(entry).getInputStream(access);
if (entry.getMethod() == ZipEntry.DEFLATED) {
inputStream = new ZipInflaterInputStream(inputStream, (int) entry.getSize());
}
return inputStream;
}
public RandomAccessData getEntryData(String name) throws IOException {
FileHeader entry = getEntry(name, FileHeader.class, false);
if (entry == null) {
return null;
}
return getEntryData(entry);
}
private RandomAccessData getEntryData(FileHeader entry) throws IOException {
// aspectjrt-1.7.4.jar has a different ext bytes length in the
// local directory to the central directory. We need to re-read
// here to skip them
RandomAccessData data = this.jarFile.getData();
byte[] localHeader = Bytes.get(
data.getSubsection(entry.getLocalHeaderOffset(), LOCAL_FILE_HEADER_SIZE));
long nameLength = Bytes.littleEndianValue(localHeader, 26, 2);
long extraLength = Bytes.littleEndianValue(localHeader, 28, 2);
return data.getSubsection(entry.getLocalHeaderOffset() + LOCAL_FILE_HEADER_SIZE
+ nameLength + extraLength, entry.getCompressedSize());
}
private T getEntry(String name, Class type,
boolean cacheEntry) {
int hashCode = AsciiBytes.hashCode(name);
T entry = getEntry(hashCode, name, NO_SUFFIX, type, cacheEntry);
if (entry == null) {
hashCode = AsciiBytes.hashCode(hashCode, SLASH);
entry = getEntry(hashCode, name, SLASH, type, cacheEntry);
}
return entry;
}
private T getEntry(int hashCode, String name, String suffix,
Class type, boolean cacheEntry) {
int index = getFirstIndex(hashCode);
while (index >= 0 && index < this.size && this.hashCodes[index] == hashCode) {
T entry = getEntry(index, type, cacheEntry);
if (entry.hasName(name, suffix)) {
return entry;
}
index++;
}
return null;
}
@SuppressWarnings("unchecked")
private T getEntry(int index, Class type,
boolean cacheEntry) {
try {
FileHeader cached = this.entriesCache.get(index);
FileHeader entry = (cached != null ? cached
: CentralDirectoryFileHeader.fromRandomAccessData(
this.centralDirectoryData,
this.centralDirectoryOffsets[index], this.filter));
if (CentralDirectoryFileHeader.class.equals(entry.getClass())
&& type.equals(JarEntry.class)) {
entry = new JarEntry(this.jarFile, (CentralDirectoryFileHeader) entry);
}
if (cacheEntry && cached != entry) {
this.entriesCache.put(index, entry);
}
return (T) entry;
}
catch (IOException ex) {
throw new IllegalStateException(ex);
}
}
private int getFirstIndex(int hashCode) {
int index = Arrays.binarySearch(this.hashCodes, 0, this.size, hashCode);
if (index < 0) {
return -1;
}
while (index > 0 && this.hashCodes[index - 1] == hashCode) {
index--;
}
return index;
}
public void clearCache() {
this.entriesCache.clear();
}
private AsciiBytes applyFilter(AsciiBytes name) {
return (this.filter == null ? name : this.filter.apply(name));
}
/**
* Iterator for contained entries.
*/
private class EntryIterator implements Iterator {
private int index = 0;
@Override
public boolean hasNext() {
return this.index < JarFileEntries.this.size;
}
@Override
public JarEntry next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
int entryIndex = JarFileEntries.this.positions[this.index];
this.index++;
return getEntry(entryIndex, JarEntry.class, true);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}