com.effektif.workflow.api.bpmn.XmlElement Maven / Gradle / Ivy
/*
* Copyright 2014 Effektif GmbH.
*
* 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.effektif.workflow.api.bpmn;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.effektif.workflow.api.json.JsonIgnore;
/**
* XML DOM structure that is jsonnable with Jackson
* so that it can be serialized to/from JSON for REST service and database persistence.
*
* @author Tom Baeyens
*/
public class XmlElement {
private static final Logger log = LoggerFactory.getLogger(XmlElement.class);
/** prefix:localPart. eg "e:subject" */
public String name;
/** Maps attribute names (prefix:localPart eg "e:type" or "type") to attribute values. */
public Map attributes;
/** Maps namespace URIs to prefixes; a null value represents the default namespace. */
public XmlNamespaces namespaces;
public List elements;
public String text;
/** not persisted in the db */
@JsonIgnore
public XmlElement parent;
/** not persisted in the db */
@JsonIgnore
public String namespaceUri;
// name ///////////////////////////////////////////////////////////////////////////
/**
* Clears the BPMN element name, used to clean up unparsed BPMN after BPMN import when the name is redundant.
*/
public void clearName() {
this.name = null;
}
/**
* Simplifies the BPMN XML by empty collections of attributes, child elements and extension elements.
*/
public void cleanEmptyElements() {
// Remove empty attributes list.
if (attributes != null && attributes.isEmpty()) {
attributes = null;
}
if (elements != null) {
// Recursively clean child elements.
for (XmlElement childElement : elements) {
childElement.cleanEmptyElements();
}
// Remove empty child elements list.
if (elements.isEmpty()) {
elements = null;
}
}
}
public void setName(String namespaceUri, String localPart) {
this.name = getNamespacePrefix(namespaceUri) + localPart;
this.namespaceUri = namespaceUri;
}
public boolean is(String namespaceUri, String localPart) {
return (this.namespaceUri!= null && this.namespaceUri.equals(namespaceUri) && name.equals(localPart))
|| (name.equals(getNamespacePrefix(namespaceUri)+localPart));
}
public String getName() {
return name;
}
public String getLocalBPMNName() {
String localPart = this.name.contains(":") ? this.name.substring(this.name.indexOf(':') + 1) : this.name;
return this.is("http://www.omg.org/spec/BPMN/20100524/MODEL", localPart) ? localPart : null;
}
// namespaces ///////////////////////////////////////////////////////////////////////////
/** maps namespace uris to prefixes */
public XmlNamespaces getNamespaces() {
return namespaces;
}
public void addNamespace(String namespaceUri, String prefix) {
if (namespaces == null) {
namespaces = new XmlNamespaces();
}
if ("".equals(prefix)) {
prefix = null;
}
try {
namespaces.add(prefix, namespaceUri);
} catch (URISyntaxException e) {
log.error(String.format("Cannot add XML namespace for invalid URI %s: %s", namespaceUri, e.getMessage()));
}
}
public boolean hasNamespace(String namespaceUri) {
if (this.namespaces!=null && this.namespaces.hasNamespace(namespaceUri)) {
return true;
}
if (parent!=null) {
return parent.hasNamespace(namespaceUri);
}
return false;
}
protected String getNamespacePrefix(String namespaceUri) {
if (this.namespaces != null && this.namespaces.hasNamespace(namespaceUri)) {
String prefix = this.namespaces.getPrefix(namespaceUri);
return prefix == null || prefix.isEmpty() ? "" : prefix + ":";
}
if (parent!=null) {
return parent.getNamespacePrefix(namespaceUri);
}
return "";
}
// elements ///////////////////////////////////////////////////////////////////////////
public List getElements() {
return elements;
}
public List removeElements(String namespaceUri, String localPart) {
List result = new ArrayList<>();
if (this.elements != null) {
Iterator iterator = this.elements.iterator();
while (iterator.hasNext()) {
XmlElement xmlElement = iterator.next();
if (xmlElement.is(namespaceUri, localPart)) {
iterator.remove();
result.add(xmlElement);
}
}
}
return result;
}
public XmlElement removeElement(String namespaceUri, String localPart) {
if (elements!=null) {
Iterator iterator = elements.iterator();
while (iterator.hasNext()) {
XmlElement xmlElement = iterator.next();
if (xmlElement.is(namespaceUri, localPart)) {
iterator.remove();
return xmlElement;
}
}
}
return null;
}
/**
* Removes the specified element if it has no child elements (attributes are ignored).
*/
public void removeEmptyElement(String namespaceUri, String localPart) {
XmlElement element = getElement(namespaceUri, localPart);
if (element != null) {
List childElements = element.getElements();
if (childElements == null || childElements.isEmpty()) {
removeElement(namespaceUri, localPart);
}
}
}
/**
* Returns the first element with the given name, or null if there isn’t one.
*/
public XmlElement getElement(String namespaceUri, String localPart) {
if (elements==null) {
return null;
}
for (XmlElement childElement : elements) {
if (childElement.is(namespaceUri, localPart)) {
return childElement;
}
}
return null;
}
public XmlElement getOrCreateChildElement(String namespaceUri, String localPart) {
return getOrCreateChildElement(namespaceUri, localPart, null);
}
/**
* Returns either the first element with the given name, or the result of adding a new element if there wasn’t one.
*/
public XmlElement getOrCreateChildElement(String namespaceUri, String localPart, Integer index) {
XmlElement existingElement = getElement(namespaceUri, localPart);
if (existingElement!=null) {
return existingElement;
}
return createElement(namespaceUri, localPart, index);
}
public XmlElement createElement(String namespaceUri, String localPart) {
return createElement(namespaceUri, localPart, null);
}
public XmlElement createElementFirst(String namespaceUri, String localPart) {
return createElement(namespaceUri, localPart, 0);
}
public XmlElement createElement(String namespaceUri, String localPart, Integer index) {
XmlElement element = new XmlElement();
element.parent = this;
element.namespaceUri = namespaceUri;
addElement(element, index);
element.setName(namespaceUri, localPart);
return element;
}
public void addElement(XmlElement xmlElement) {
addElement(xmlElement, null);
}
public void addElementFirst(XmlElement xmlElement) {
addElement(xmlElement, 0);
}
public void addElement(XmlElement xmlElement, Integer index) {
if (xmlElement!=null) {
if (elements==null) {
this.elements = new ArrayList<>();
}
if (index!=null) {
this.elements.add(index, xmlElement);
} else {
this.elements.add(xmlElement);
}
xmlElement.parent = this;
}
}
// attributes ///////////////////////////////////////////////////////////////////////////
public void addAttribute(String namespaceUri, String localPart, Object value) {
if (attributes==null) {
attributes = new LinkedHashMap<>();
}
String attributeName = null;
if (this.namespaceUri!=null && this.namespaceUri.equals(namespaceUri)) {
attributeName = localPart;
} else {
attributeName = getNamespacePrefix(namespaceUri)+localPart;
}
attributes.put(attributeName, escapeAttributeValue(value));
}
public String removeAttribute(String namespaceUri, String localPart) {
if (attributes==null) {
return null;
}
if ( this.namespaceUri.equals(namespaceUri)
&& attributes.containsKey(localPart) ) {
return unescapeXml(attributes.remove(localPart));
}
String attributeName = getNamespacePrefix(namespaceUri)+localPart;
return unescapeXml(attributes.remove(attributeName));
}
public String getAttribute(String namespaceUri, String localPart) {
if (attributes==null) {
return null;
}
if ( this.namespaceUri.equals(namespaceUri)
&& attributes.containsKey(localPart) ) {
return unescapeXml(attributes.get(localPart));
}
String attributeName = getNamespacePrefix(namespaceUri)+localPart;
return unescapeXml(attributes.get(attributeName));
}
public Map getAttributes() {
return attributes;
}
// text ///////////////////////////////////////////////////////////////////////////
private static Pattern specialCharacters = Pattern.compile("[<>&]");
/**
* Adds text to the current element’s text node, wrapping the text in CDATA section if necessary, instead of escaping.
*/
public void addCDataText(String value) {
if (value != null) {
boolean containsSpecialCharacters = specialCharacters.matcher(value).find();
String wrappedText = containsSpecialCharacters ? "" : value;
this.text = this.text != null ? this.text + wrappedText : wrappedText;
}
}
/**
* Adds text to the current element’s text node, escaping XML special characters.
*/
public void addText(Object value) {
if (value != null) {
String text = value.toString();
if (!"".equals(text.trim())) {
this.text = this.text != null ? this.text + escapeTextNode(text) : escapeTextNode(text);
}
}
}
public String getText() {
return unescapeXml(text);
}
// other ///////////////////////////////////////////////////////////////////////////
public boolean isEmpty() {
if (attributes != null && !attributes.isEmpty()) {
return false;
}
if (elements != null && !elements.isEmpty()) {
return false;
}
if (text != null && !text.isEmpty()) {
return false;
}
return true;
}
public boolean hasContent() {
if (elements!=null && !elements.isEmpty()) {
return false;
}
if (text!=null && !"".equals(text)) {
return false;
}
return true;
}
private static String escapeTextNode(Object value) { return escapeXml(value, false); }
private static String escapeAttributeValue(Object value) { return escapeXml(value, true); }
private static String escapeXml(Object value, boolean replaceQuotes) {
if (value == null) {
return null;
}
String text = value.toString();
String result = text.replaceAll("&", "&").replaceAll("<", "<").replaceAll(">", ">");
if (replaceQuotes) {
result = result.replaceAll("\"", """).replaceAll("'", "'");
}
return result;
}
private static String unescapeXml(String value) {
if (value == null) {
return null;
}
return value.replaceAll(""", "\"").replaceAll("'", "'").replaceAll("<", "<").replaceAll(">", ">")
.replaceAll("&", "&");
}
/**
* Recursively fixes parent relationships, which are unset after deserialisation, such as when unparsed BPMN is read
* from the database. If these parent relationships are not set, then the recursive namespace lookup fails.
*/
public void setElementParents() {
if (elements == null) {
return;
}
for (XmlElement child : elements) {
if (child.parent == null) {
child.parent = this;
}
child.setElementParents();
}
}
}
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