How to parse xml with children with the same name as parent
I have xml:
<?xml version="1.0" encoding="UTF-8"?>
<workflow>
<call name="api1">
<repeat>100</repeat>
<delay>60</delay>
<call name="apicallafterapi1">
<fields>c_id</fields>
<repeat>10</repeat>
<delay>2</delay>
</call>
</call>
<call name="api2">
<repeat>1000</repeat>
<delay>5</delay>
</call>
<call name="api3">
<repeat>1000</repeat>
</call>
</workflow>
In another element call
such as complex elements api1
may exist call
. Is this xml structure valid? If so, how can I parse this xml usingSAX
class Call {
String name;
int repeat;
int delay;
List<Call> onResponseCall = new ArrayList<>();
public void setName(String name) {
this.name = name;
}
public void setRepeat(int repeat) {
this.repeat = repeat;
}
public void setDelay(int delay) {
this.delay = delay;
}
public void addCall(Call c) {
onResponseCall.add(c);
}
}
class WorkFlow {
private List<Call> calls = new ArrayList<>();
public void addCall(Call c) {
calls.add(c);
}
}
@Override
public void characters(char[] buffer, int start, int length) {
temp = new String(buffer, start, length);
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
temp = "";
if (qName.equalsIgnoreCase("call")) {
call = new Call();
call.setName(attributes.getValue("name"));
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if (qName.equalsIgnoreCase("call")) {
// add it to the list
workflow.add(call);
} else if (qName.equalsIgnoreCase("repeat")) {
call.setRepeat(Integer.parseInt(temp));
} else if (qName.equalsIgnoreCase("delay")) {
call.setDelay(Integer.parseInt(temp));
} else if (qName.equalsIgnoreCase("call")) {
Call c = new Call();
}
}
Where to call me Workflow.add(call)
andCall.add(call)
EDIT
<call>
<name>send_message</name>
<repeat>1</repeat>
<delay>2</delay>
<useParentFields>
<field>c_id</field>
<field>m_id</field>
</useParentFields>
<uniqueFields>
<field type="Long.class">d_id</field>
<field type="Long.class">a_id</field>
</uniqueFields>
</call>
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2 answers
I am wondering how to do this and the solution seems to be quite simple. To play with the main solution, you can check commit .
If you only want the basic answer, check the code below:
Workflow
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "workflow")
public class Workflow {
@XmlElement(name="call")
private List<Call> calls;
}
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
Call
@XmlAccessorType(XmlAccessType.FIELD)
public class Call {
@XmlAttribute
private String name;
private String repeat;
private String delay;
private String fields;
@XmlElement(name="call")
private List<Call> call;
}
enter a dot like
import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class Main {
public static void main(String[] args) throws JAXBException {
JAXBContext jc = JAXBContext.newInstance(Workflow.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/variant.xml");
Workflow sc = (Workflow) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(Marshaller.JAXB_SCHEMA_LOCATION, "Workflow.xml");
marshaller.marshal(sc, System.out);
}
}
variant.xml - your xml
<?xml version="1.0" encoding="UTF-8"?>
<workflow>
<call name="api1">
<repeat>100</repeat>
<delay>60</delay>
<call name="apicallafterapi1">
<fields>c_id</fields>
<repeat>10</repeat>
<delay>2</delay>
</call>
</call>
<call name="api2">
<repeat>1000</repeat>
<delay>5</delay>
</call>
<call name="api3">
<repeat>1000</repeat>
</call>
</workflow>
Hope this is clear with a general example, but ask if there are any questions.
You can handle the comparison of names if I already parsed the xml.
To make objects more useful you can add getter \ setter \ equals \ hashCode etc.
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I solved this by taking the following approach. Modify the xml to define the parent and child nodes.
workflow.xml
<?xml version="1.0" encoding="UTF-8"?>
<workflow>
<flow>
<call type="parent">
<name>api1</name>name>
<repeat>100</repeat>
<delay>60</delay>
<call type="child">
<name>apicallafterapi1</name>
<fields>c_id</fields>
<repeat>10</repeat>
<delay>2</delay>
</call>
</call>
<call type="parent">
<name>api2</name>
<repeat>1000</repeat>
<delay>5</delay>
</call>
<call type="parent">
<name>api3</name>
<repeat>1000</repeat>
</call>
</flow>
Parse code
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
temp = "";
if (qName.equalsIgnoreCase("call")) {
if(attributes.getValue("type").equals("parent")) {
flow.isParent = true;
parentCall = new Call(); //parent call
parentCall.setType(attributes.getValue("type"));
}
else {
flow.isParent = false;
childCall = new Call(); //Child call
childCall.setType(attributes.getValue("type"));
}
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
Call c = flow.isParent ? parentCall : childCall;
if (qName.equalsIgnoreCase("call")) {
// add it to the list
if(flow.isParent) { //add to workflow
flow.addCall(parentCall);
}
else {
parentCall.onResponseCall.add(childCall);
flow.isParent = true;
}
}
else if (qName.equalsIgnoreCase("name")) {
c.setName(temp);
}
else if (qName.equalsIgnoreCase("repeat")) {
c.setRepeat(Integer.parseInt(temp));
}
else if (qName.equalsIgnoreCase("delay")) {
c.setDelay(Integer.parseInt(temp));
}
else if (qName.equalsIgnoreCase("fields")) {
c.setFields(temp);
}
}
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