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Chapter 307. StAX Component

Available as of Camel version 2.9

The StAX component allows messages to be process through a SAX ContentHandler.
Another feature of this component is to allow to iterate over JAXB records using StAX, for example using the Splitter EIP.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-stax</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-stax</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

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307.1. URI format
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stax:content-handler-class

stax:content-handler-class

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example:

stax:org.superbiz.FooContentHandler

stax:org.superbiz.FooContentHandler

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From Camel 2.11.1 onwards you can lookup a org.xml.sax.ContentHandler bean from the Registry using the # syntax as shown:

stax:#myHandler

stax:#myHandler

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307.2. Options
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The StAX component has no options.

The StAX endpoint is configured using URI syntax:

stax:contentHandlerClass

stax:contentHandlerClass

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with the following path and query parameters:

307.2.1. Path Parameters (1 parameters):
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Expand

Name	Description	Default	Type
contentHandlerClass	Required The FQN class name for the ContentHandler implementation to use.		String

307.2.2. Query Parameters (1 parameters):
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Expand

Name	Description	Default	Type
synchronous (advanced)	Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).	false	boolean

307.3. Usage of a content handler as StAX parser
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The message body after the handling is the handler itself.

Here an example:

from("file:target/in")
  .to("stax:org.superbiz.handler.CountingHandler")
  // CountingHandler implements org.xml.sax.ContentHandler or extends org.xml.sax.helpers.DefaultHandler
  .process(new Processor() {
    @Override
    public void process(Exchange exchange) throws Exception {
        CountingHandler handler = exchange.getIn().getBody(CountingHandler.class);
        // do some great work with the handler
    }
  });

from("file:target/in")
  .to("stax:org.superbiz.handler.CountingHandler")
  // CountingHandler implements org.xml.sax.ContentHandler or extends org.xml.sax.helpers.DefaultHandler
  .process(new Processor() {
    @Override
    public void process(Exchange exchange) throws Exception {
        CountingHandler handler = exchange.getIn().getBody(CountingHandler.class);
        // do some great work with the handler
    }
  });

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307.4. Iterate over a collection using JAXB and StAX
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First we suppose you have JAXB objects.

For instance a list of records in a wrapper object:

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "records")
public class Records {
    @XmlElement(required = true)
    protected List<Record> record;

    public List<Record> getRecord() {
        if (record == null) {
            record = new ArrayList<Record>();
        }
        return record;
    }
}

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "records")
public class Records {
    @XmlElement(required = true)
    protected List<Record> record;

    public List<Record> getRecord() {
        if (record == null) {
            record = new ArrayList<Record>();
        }
        return record;
    }
}

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and

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "record", propOrder = { "key", "value" })
public class Record {
    @XmlAttribute(required = true)
    protected String key;

    @XmlAttribute(required = true)
    protected String value;

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "record", propOrder = { "key", "value" })
public class Record {
    @XmlAttribute(required = true)
    protected String key;

    @XmlAttribute(required = true)
    protected String value;

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}

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Then you get a XML file to process:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<records>
  <record value="v0" key="0"/>
  <record value="v1" key="1"/>
  <record value="v2" key="2"/>
  <record value="v3" key="3"/>
  <record value="v4" key="4"/>
  <record value="v5" key="5"/>
</record>

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<records>
  <record value="v0" key="0"/>
  <record value="v1" key="1"/>
  <record value="v2" key="2"/>
  <record value="v3" key="3"/>
  <record value="v4" key="4"/>
  <record value="v5" key="5"/>
</record>

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The StAX component provides an StAXBuilder which can be used when iterating XML elements with the Camel Splitter

from("file:target/in")
    .split(stax(Record.class)).streaming()
        .to("mock:records");

from("file:target/in")
    .split(stax(Record.class)).streaming()
        .to("mock:records");

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Where stax is a static method on org.apache.camel.component.stax.StAXBuilder which you can static import in the Java code. The stax builder is by default namespace aware on the XMLReader it uses. From Camel 2.11.1 onwards you can turn this off by setting the boolean parameter to false, as shown below:

from("file:target/in")
    .split(stax(Record.class, false)).streaming()
        .to("mock:records");

from("file:target/in")
    .split(stax(Record.class, false)).streaming()
        .to("mock:records");

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307.4.1. The previous example with XML DSL
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The example above could be implemented as follows in XML DSL

307.5. See Also
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Configuring Camel
Component
Endpoint
Getting Started

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이 콘텐츠는 선택한 언어로 제공되지 않습니다.

Chapter 307. StAX Component

307.1. URI format
링크 복사

307.2. Options
링크 복사

307.2.1. Path Parameters (1 parameters):
링크 복사

307.2.2. Query Parameters (1 parameters):
링크 복사

307.3. Usage of a content handler as StAX parser
링크 복사

307.4. Iterate over a collection using JAXB and StAX
링크 복사

307.4.1. The previous example with XML DSL
링크 복사

307.5. See Also
링크 복사

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이 콘텐츠는 선택한 언어로 제공되지 않습니다.

Chapter 307. StAX Component

307.1. URI format링크 복사링크가 클립보드에 복사되었습니다!

307.2. Options링크 복사링크가 클립보드에 복사되었습니다!

307.2.1. Path Parameters (1 parameters):링크 복사링크가 클립보드에 복사되었습니다!

307.2.2. Query Parameters (1 parameters):링크 복사링크가 클립보드에 복사되었습니다!

307.3. Usage of a content handler as StAX parser링크 복사링크가 클립보드에 복사되었습니다!

307.4. Iterate over a collection using JAXB and StAX링크 복사링크가 클립보드에 복사되었습니다!

307.4.1. The previous example with XML DSL링크 복사링크가 클립보드에 복사되었습니다!

307.5. See Also링크 복사링크가 클립보드에 복사되었습니다!

자세한 정보

평가판, 구매 및 판매

커뮤니티

Red Hat 문서 정보

보다 포괄적 수용을 위한 오픈 소스 용어 교체

Red Hat 소개

Theme

Red Hat legal and privacy links

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307.1. URI format
링크 복사

307.2. Options
링크 복사

307.2.1. Path Parameters (1 parameters):
링크 복사

307.2.2. Query Parameters (1 parameters):
링크 복사

307.3. Usage of a content handler as StAX parser
링크 복사

307.4. Iterate over a collection using JAXB and StAX
링크 복사

307.4.1. The previous example with XML DSL
링크 복사

307.5. See Also
링크 복사