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/*
* Copyright (c) 2019-2020 Ronald Brill.
*
* 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 com.gargoylesoftware.css.dom;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import com.gargoylesoftware.css.parser.CSSException;
import com.gargoylesoftware.css.parser.CSSOMParser;
import com.gargoylesoftware.css.parser.media.MediaQueryList;
import com.gargoylesoftware.css.parser.selector.ElementSelector;
import com.gargoylesoftware.css.parser.selector.Selector;
import com.gargoylesoftware.css.util.LangUtils;
import com.gargoylesoftware.css.util.ThrowCssExceptionErrorHandler;
/**
* Implementation of CSSStyleSheet.
*
* @author Ronald Brill
*/
public class CSSStyleSheetImpl implements Serializable {
private boolean disabled_;
private Node ownerNode_;
private String href_;
private String title_;
private MediaListImpl media_;
private AbstractCSSRuleImpl ownerRule_;
private CSSRuleListImpl cssRules_;
private CSSStyleSheetRuleIndex index_;
/**
* Ctor.
*/
public CSSStyleSheetImpl() {
super();
}
/**
* @return the disable state
*/
public boolean getDisabled() {
return disabled_;
}
/**
* We will need to respond more fully if a stylesheet is disabled, probably
* by generating an event for the main application.
* @param disabled the new disabled
*/
public void setDisabled(final boolean disabled) {
disabled_ = disabled;
}
/**
* @return the owner node
*/
public Node getOwnerNode() {
return ownerNode_;
}
/**
* @return the href
*/
public String getHref() {
return href_;
}
/**
* @return the title
*/
public String getTitle() {
return title_;
}
/**
* @return the media list
*/
public MediaListImpl getMedia() {
return media_;
}
/**
* @return the owner rule
*/
public AbstractCSSRuleImpl getOwnerRule() {
return ownerRule_;
}
/**
* @return the css rules
*/
public CSSRuleListImpl getCssRules() {
if (cssRules_ == null) {
cssRules_ = new CSSRuleListImpl();
}
return cssRules_;
}
/**
* inserts a new rule.
*
* @param rule the rule to insert
* @param index the insert pos
* @throws DOMException in case of error
*/
public void insertRule(final String rule, final int index) throws DOMException {
try {
final CSSOMParser parser = new CSSOMParser();
parser.setParentStyleSheet(this);
parser.setErrorHandler(ThrowCssExceptionErrorHandler.INSTANCE);
final AbstractCSSRuleImpl r = parser.parseRule(rule);
if (r == null) {
// this should neven happen because of the ThrowCssExceptionErrorHandler
throw new DOMExceptionImpl(
DOMException.SYNTAX_ERR,
DOMExceptionImpl.SYNTAX_ERROR,
"Parsing rule '" + rule + "' failed.");
}
if (getCssRules().getLength() > 0) {
// We need to check that this type of rule can legally go into
// the requested position.
int msg = -1;
if (r instanceof CSSCharsetRuleImpl) {
// Index must be 0, and there can be only one charset rule
if (index != 0) {
msg = DOMExceptionImpl.CHARSET_NOT_FIRST;
}
else if (getCssRules().getRules().get(0) instanceof CSSCharsetRuleImpl) {
msg = DOMExceptionImpl.CHARSET_NOT_UNIQUE;
}
}
else if (r instanceof CSSImportRuleImpl) {
// Import rules must preceed all other rules (except
// charset rules)
if (index <= getCssRules().getLength()) {
for (int i = 0; i < index; i++) {
final AbstractCSSRuleImpl ri = getCssRules().getRules().get(i);
if (!(ri instanceof CSSCharsetRuleImpl) && !(ri instanceof CSSImportRuleImpl)) {
msg = DOMExceptionImpl.IMPORT_NOT_FIRST;
break;
}
}
}
}
else {
if (index <= getCssRules().getLength()) {
for (int i = index; i < getCssRules().getLength(); i++) {
final AbstractCSSRuleImpl ri = getCssRules().getRules().get(i);
if ((ri instanceof CSSCharsetRuleImpl) || (ri instanceof CSSImportRuleImpl)) {
msg = DOMExceptionImpl.INSERT_BEFORE_IMPORT;
break;
}
}
}
}
if (msg > -1) {
throw new DOMExceptionImpl(DOMException.HIERARCHY_REQUEST_ERR, msg);
}
}
// Insert the rule into the list of rules
getCssRules().insert(r, index);
}
catch (final IndexOutOfBoundsException e) {
throw new DOMExceptionImpl(
DOMException.INDEX_SIZE_ERR,
DOMExceptionImpl.INDEX_OUT_OF_BOUNDS,
e.getMessage());
}
catch (final CSSException e) {
throw new DOMExceptionImpl(
DOMException.SYNTAX_ERR,
DOMExceptionImpl.SYNTAX_ERROR,
e.getMessage());
}
catch (final IOException e) {
throw new DOMExceptionImpl(
DOMException.SYNTAX_ERR,
DOMExceptionImpl.SYNTAX_ERROR,
e.getMessage());
}
}
/**
* delete the rule at the given pos.
*
* @param index the pos
* @throws DOMException in case of error
*/
public void deleteRule(final int index) throws DOMException {
try {
getCssRules().delete(index);
}
catch (final IndexOutOfBoundsException e) {
throw new DOMExceptionImpl(
DOMException.INDEX_SIZE_ERR,
DOMExceptionImpl.INDEX_OUT_OF_BOUNDS,
e.getMessage());
}
}
/**
* Set the owner node.
* @param ownerNode the new node
*/
public void setOwnerNode(final Node ownerNode) {
ownerNode_ = ownerNode;
}
/**
* Set the href.
* @param href the new href
*/
public void setHref(final String href) {
href_ = href;
}
/**
* Set the title.
* @param title the new title
*/
public void setTitle(final String title) {
title_ = title;
}
/**
* Set the media text.
* @param mediaText the new media text
*/
public void setMediaText(final String mediaText) {
try {
final CSSOMParser parser = new CSSOMParser();
final MediaQueryList sml = parser.parseMedia(mediaText);
media_ = new MediaListImpl(sml);
}
catch (final IOException e) {
// TODO handle exception
}
}
/**
* @param ownerRule the new ownerRule
*/
public void setOwnerRule(final AbstractCSSRuleImpl ownerRule) {
ownerRule_ = ownerRule;
}
/**
* @param rules the new rules
*/
public void setCssRules(final CSSRuleListImpl rules) {
cssRules_ = rules;
}
@Override
public String toString() {
return getCssRules().toString();
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof CSSStyleSheetImpl)) {
return false;
}
final CSSStyleSheetImpl css = (CSSStyleSheetImpl) obj;
boolean eq = LangUtils.equals(getCssRules(), css.getCssRules());
eq = eq && (getDisabled() == css.getDisabled());
eq = eq && LangUtils.equals(getHref(), css.getHref());
eq = eq && LangUtils.equals(getMedia(), css.getMedia());
eq = eq && LangUtils.equals(getTitle(), css.getTitle());
return eq;
}
@Override
public int hashCode() {
int hash = LangUtils.HASH_SEED;
hash = LangUtils.hashCode(hash, cssRules_);
hash = LangUtils.hashCode(hash, disabled_);
hash = LangUtils.hashCode(hash, href_);
hash = LangUtils.hashCode(hash, media_);
hash = LangUtils.hashCode(hash, ownerNode_);
hash = LangUtils.hashCode(hash, title_);
return hash;
}
private void writeObject(final ObjectOutputStream out) throws IOException {
out.writeObject(cssRules_);
out.writeBoolean(disabled_);
out.writeObject(href_);
out.writeObject(media_);
out.writeObject(title_);
}
private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
cssRules_ = (CSSRuleListImpl) in.readObject();
if (cssRules_ != null) {
for (int i = 0; i < cssRules_.getLength(); i++) {
final AbstractCSSRuleImpl cssRule = cssRules_.getRules().get(i);
cssRule.setParentStyleSheet(this);
}
}
disabled_ = in.readBoolean();
href_ = (String) in.readObject();
media_ = (MediaListImpl) in.readObject();
title_ = (String) in.readObject();
}
/**
* @return the CSSStyleSheetRuleIndex
*/
public CSSStyleSheetRuleIndex getRuleIndex() {
return index_;
}
/**
* Set the CSSStyleSheetRuleIndex.
* @param index the new index
*/
public void setRuleIndex(final CSSStyleSheetRuleIndex index) {
index_ = index;
}
/**
* Clean the index.
*/
public void resetRuleIndex() {
index_ = null;
}
/**
* SelectorEntry.
*/
public static final class SelectorEntry {
private Selector selector_;
private CSSStyleRuleImpl rule_;
SelectorEntry(final Selector selector, final CSSStyleRuleImpl rule) {
selector_ = selector;
rule_ = rule;
}
/**
* @return the selector
*/
public Selector getSelector() {
return selector_;
}
/**
* @return the rule
*/
public CSSStyleRuleImpl getRule() {
return rule_;
}
}
/**
* CSSStyleSheetRuleIndex.
*/
public static class CSSStyleSheetRuleIndex {
private static final class SelectorIndex {
private final Map> keyToSelectors_ = new HashMap<>();
void add(final String key, final SelectorEntry selector) {
List entry = keyToSelectors_.get(key);
if (entry == null) {
entry = new ArrayList<>();
keyToSelectors_.put(key, entry);
}
entry.add(selector);
}
List get(final String key) {
final List entry = keyToSelectors_.get(key);
if (entry == null) {
return Collections.emptyList();
}
return entry;
}
}
private static final MediaListImpl DEFAULT_MEDIA_LIST = new MediaListImpl(null);
private final List children_ = new ArrayList<>();
private MediaListImpl mediaList_ = DEFAULT_MEDIA_LIST;
private final SelectorIndex elementSelectors_ = new SelectorIndex();
private final SelectorIndex classSelectors_ = new SelectorIndex();
private final List otherSelectors_ = new ArrayList<>();
/**
* Add an ElementSelector.
*
* @param elementSelector the selector to be added
* @param s the selector
* @param styleRule the rule
*/
public void addElementSelector(final ElementSelector elementSelector,
final Selector s, final CSSStyleRuleImpl styleRule) {
final String elementName = elementSelector.getLocalNameLowerCase();
elementSelectors_.add(elementName, new SelectorEntry(s, styleRule));
}
/**
* Add a ClassSelector.
*
* @param elementSelector the selector to be added
* @param className the class name
* @param s the selector
* @param styleRule the rule
*/
public void addClassSelector(final ElementSelector elementSelector, final String className,
final Selector s, final CSSStyleRuleImpl styleRule) {
final String elementName = elementSelector.getLocalNameLowerCase();
final String key;
if (elementName == null) {
key = "." + className;
}
else {
key = elementName + "." + className;
}
classSelectors_.add(key, new SelectorEntry(s, styleRule));
}
/**
* Add a OtherSelector.
*
* @param s the selector
* @param styleRule the rule
*/
public void addOtherSelector(final Selector s, final CSSStyleRuleImpl styleRule) {
final SelectorEntry selectorEntry = new SelectorEntry(s, styleRule);
otherSelectors_.add(selectorEntry);
}
/**
* Add a media list.
* @param mediaList the list to add
* @return the CSSStyleSheetRuleIndex
*/
public CSSStyleSheetRuleIndex addMedia(final MediaListImpl mediaList) {
final String media = mediaList.getMediaText();
for (final CSSStyleSheetRuleIndex cssStyleSheetRuleIndex : children_) {
if (media.equals(cssStyleSheetRuleIndex.getMediaList().getMediaText())) {
return cssStyleSheetRuleIndex;
}
}
final CSSStyleSheetRuleIndex index = new CSSStyleSheetRuleIndex();
index.mediaList_ = mediaList;
children_.add(index);
return index;
}
/**
* @return return the medial list
*/
public MediaListImpl getMediaList() {
return mediaList_;
}
/**
* @return the children
*/
public List getChildren() {
return children_;
}
/**
* @param elementName the element
* @param classes the classes
* @return Iterator of SelectorEntry
*/
public Iterator getSelectorEntriesIteratorFor(final String elementName, final String[] classes) {
return new SelectorEntriesIterator(this, elementName, classes);
}
}
static final class SelectorEntriesIterator implements Iterator {
private LinkedList> iterators_;
SelectorEntriesIterator(final CSSStyleSheetRuleIndex index,
final String elementName,
final String[] classes) {
iterators_ = new LinkedList<>();
List selectors = index.elementSelectors_.get(null);
if (!selectors.isEmpty()) {
iterators_.add(selectors.iterator());
}
selectors = index.elementSelectors_.get(elementName);
if (!selectors.isEmpty()) {
iterators_.add(selectors.iterator());
}
if (classes != null) {
for (final String clazz : classes) {
selectors = index.classSelectors_.get("." + clazz);
if (selectors != null && !selectors.isEmpty()) {
iterators_.add(selectors.iterator());
}
if (elementName != null) {
selectors = index.classSelectors_.get(elementName + "." + clazz);
if (selectors != null && !selectors.isEmpty()) {
iterators_.add(selectors.iterator());
}
}
}
}
if (index.otherSelectors_ != null && !index.otherSelectors_.isEmpty()) {
iterators_.add(index.otherSelectors_.iterator());
}
}
@Override
public SelectorEntry next() {
if (iterators_.isEmpty()) {
return null;
}
final Iterator iter = iterators_.peek();
if (iter.hasNext()) {
return iter.next();
}
iterators_.removeFirst();
return next();
}
@Override
public boolean hasNext() {
if (iterators_.isEmpty()) {
return false;
}
final Iterator iter = iterators_.peek();
if (iter.hasNext()) {
return true;
}
iterators_.pop();
return hasNext();
}
}
}
