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XLT (Xceptance LoadTest) is an extensive load and performance test tool developed and maintained by Xceptance.
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/*
* Copyright (c) 2002-2024 Gargoyle Software Inc.
*
* 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
* https://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.htmlunit;
import static org.htmlunit.BrowserVersionFeatures.URL_MINIMAL_QUERY_ENCODING;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.lang.ref.SoftReference;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import org.htmlunit.javascript.host.Window;
import org.htmlunit.javascript.host.event.Event;
import org.htmlunit.javascript.host.event.PopStateEvent;
import org.htmlunit.util.HeaderUtils;
import org.htmlunit.util.UrlUtils;
/**
* Representation of the navigation history of a single window.
*
* @author Daniel Gredler
* @author Ahmed Ashour
* @author Adam Afeltowicz
* @author Ronald Brill
* @author Madis Pärn
*/
public class History implements Serializable {
/** The window to which this navigation history belongs. */
private final WebWindow window_;
/**
* Whether or not to ignore calls to {@link #addPage(Page)}; this is a bit hackish (we should probably be using
* explicit boolean parameters in the various methods that load new pages), but it does the job for now -- without
* any new API cruft.
*/
private transient ThreadLocal ignoreNewPages_;
/**
* The {@link History.HistoryEntry}s in this navigation history.
*/
private final List entries_ = new ArrayList<>();
/** The current index within the list of pages which make up this navigation history. */
private int index_ = -1;
/**
* The single entry in the history.
*/
private static final class HistoryEntry implements Serializable {
private transient SoftReference page_;
private final WebRequest webRequest_;
private Object state_;
HistoryEntry(final Page page) {
// verify cache-control header values before storing
if (HeaderUtils.containsNoStore(page.getWebResponse())) {
page_ = null;
}
else {
page_ = new SoftReference<>(page);
}
final WebRequest request = page.getWebResponse().getWebRequest();
webRequest_ = new WebRequest(request.getUrl(), request.getHttpMethod());
webRequest_.setRequestParameters(request.getRequestParameters());
}
Page getPage() {
if (page_ == null) {
return null;
}
return page_.get();
}
void clearPage() {
page_ = null;
}
WebRequest getWebRequest() {
return webRequest_;
}
URL getUrl() {
return webRequest_.getUrl();
}
void setUrl(final URL url, final Page page) {
if (url != null) {
WebWindow webWindow = null;
boolean minimalQueryEncoding = false;
if (page != null) {
webWindow = page.getEnclosingWindow();
if (webWindow != null) {
minimalQueryEncoding = webWindow.getWebClient()
.getBrowserVersion().hasFeature(URL_MINIMAL_QUERY_ENCODING);
}
}
final URL encoded = UrlUtils.encodeUrl(url, minimalQueryEncoding,
webRequest_.getCharset());
webRequest_.setUrl(encoded);
if (page != null) {
page.getWebResponse().getWebRequest().setUrl(encoded);
if (webWindow != null) {
final Window win = webWindow.getScriptableObject();
if (win != null) {
win.getLocation().setHash(null, encoded.getRef(), false);
}
}
}
}
}
/**
* @return the state object
*/
Object getState() {
return state_;
}
/**
* Sets the state object.
* @param state the state object to use
*/
void setState(final Object state) {
state_ = state;
}
}
/**
* Creates a new navigation history for the specified window.
* @param window the window which owns the new navigation history
*/
public History(final WebWindow window) {
window_ = window;
initTransientFields();
}
/**
* Initializes the transient fields.
*/
private void initTransientFields() {
ignoreNewPages_ = new ThreadLocal<>();
}
/**
* Returns the length of the navigation history.
* @return the length of the navigation history
*/
public int getLength() {
return entries_.size();
}
/**
* Returns the current (zero-based) index within the navigation history.
* @return the current (zero-based) index within the navigation history
*/
public int getIndex() {
return index_;
}
/**
* Returns the URL at the specified index in the navigation history, or {@code null} if the index is not valid.
* @param index the index of the URL to be returned
* @return the URL at the specified index in the navigation history, or {@code null} if the index is not valid
*/
public URL getUrl(final int index) {
if (index >= 0 && index < entries_.size()) {
return UrlUtils.toUrlSafe(entries_.get(index).getUrl().toExternalForm());
}
return null;
}
/**
* Goes back one step in the navigation history, if possible.
* @return this navigation history, after going back one step
* @throws IOException in case of error
*/
public History back() throws IOException {
if (index_ > 0) {
index_--;
goToUrlAtCurrentIndex();
}
return this;
}
/**
* Goes forward one step in the navigation history, if possible.
* @return this navigation history, after going forward one step
* @throws IOException in case of error
*/
public History forward() throws IOException {
if (index_ < entries_.size() - 1) {
index_++;
goToUrlAtCurrentIndex();
}
return this;
}
/**
* Goes forward or backwards in the navigation history, according to whether the specified relative index
* is positive or negative. If the specified index is 0, this method reloads the current page.
* @param relativeIndex the index to move to, relative to the current index
* @return this navigation history, after going forwards or backwards the specified number of steps
* @throws IOException in case of error
*/
public History go(final int relativeIndex) throws IOException {
final int i = index_ + relativeIndex;
if (i < entries_.size() && i >= 0) {
index_ = i;
goToUrlAtCurrentIndex();
}
return this;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return entries_.toString();
}
/**
* Removes the current URL from the history.
*/
public void removeCurrent() {
if (index_ >= 0 && index_ < entries_.size()) {
entries_.remove(index_);
if (index_ > 0) {
index_--;
}
}
}
/**
* Adds a new page to the navigation history.
* @param page the page to add to the navigation history
* @return the created history entry
*/
protected HistoryEntry addPage(final Page page) {
final Boolean ignoreNewPages = ignoreNewPages_.get();
if (ignoreNewPages != null && ignoreNewPages.booleanValue()) {
return null;
}
final int sizeLimit = window_.getWebClient().getOptions().getHistorySizeLimit();
if (sizeLimit <= 0) {
entries_.clear();
index_ = -1;
return null;
}
index_++;
while (entries_.size() > index_) {
entries_.remove(index_);
}
while (entries_.size() >= sizeLimit) {
entries_.remove(0);
index_--;
}
final HistoryEntry entry = new HistoryEntry(page);
entries_.add(entry);
final int cacheLimit = Math.max(window_.getWebClient().getOptions().getHistoryPageCacheLimit(), 0);
if (entries_.size() > cacheLimit) {
entries_.get(entries_.size() - cacheLimit - 1).clearPage();
}
return entry;
}
/**
* Loads the URL at the current index into the window to which this navigation history belongs.
* @throws IOException if an IO error occurs
*/
private void goToUrlAtCurrentIndex() throws IOException {
final Boolean old = ignoreNewPages_.get();
ignoreNewPages_.set(Boolean.TRUE);
try {
final HistoryEntry entry = entries_.get(index_);
final Page page = entry.getPage();
if (page == null) {
window_.getWebClient().getPage(window_, entry.getWebRequest(), false);
}
else {
window_.setEnclosedPage(page);
page.getWebResponse().getWebRequest().setUrl(entry.getUrl());
}
final Window jsWindow = window_.getScriptableObject();
if (jsWindow != null && jsWindow.hasEventHandlers("onpopstate")) {
final Event event = new PopStateEvent(jsWindow, Event.TYPE_POPSTATE, entry.getState());
jsWindow.executeEventLocally(event);
}
}
finally {
ignoreNewPages_.set(old);
}
}
/**
* Allows to change history state and url if provided.
*
* @param state the new state to use
* @param url the new url to use
*/
public void replaceState(final Object state, final URL url) {
if (index_ >= 0 && index_ < entries_.size()) {
final HistoryEntry entry = entries_.get(index_);
Page page = entry.getPage();
if (page == null) {
page = window_.getEnclosedPage();
}
entry.setUrl(url, page);
entry.setState(state);
}
}
/**
* Allows to change history state and url if provided.
*
* @param state the new state to use
* @param url the new url to use
*/
public void pushState(final Object state, final URL url) {
final Page page = window_.getEnclosedPage();
final HistoryEntry entry = addPage(page);
if (entry != null) {
entry.setUrl(url, page);
entry.setState(state);
}
}
/**
* Returns current state object.
*
* @return the current state object
*/
public Object getCurrentState() {
if (index_ >= 0 && index_ < entries_.size()) {
return entries_.get(index_).getState();
}
return null;
}
/**
* Re-initializes transient fields when an object of this type is deserialized.
* @param in the object input stream
* @throws IOException if an error occurs
* @throws ClassNotFoundException if an error occurs
*/
private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
initTransientFields();
}
}