The java.pattern.context option

The java.pattern.context option enables an interpreter facility for Relaxer objects.

Parameters

The java.pattern.context option takes one of the following values as a parameter:

true

Enables a context facility.

false

Disables a context facility.

The default configuration is false. No parameter implies that the parameter is true.

Artifacts

The java.pattern.context option generates additional classes as follows:

• RContext.java
• IJavaPatternContextFactory.java
• AbstractJavaPatternContextFactory.java
• DefaultJavaPatternContextFactory.java
• JavaPatternContextFactory.java
• IRNode.java

The java.pattern.context option adds the following methods to Relaxer objects:

• RContext rGetRContext()
• rSetRContext(RContext)
• RContext rGetRContextResolved()

The rGetRContext method informs the RContext context in the target object.

The rSetRContext method sets up the context, RContext.

The rGetRContextResolved method informs the RContext context in a entier object tree.

Example

Basic usage

List 7.23.3.1.1[javaPatternContext.rng] is a sample schema for the java.pattern.context option.

<grammar xmlns="http://relaxng.org/ns/structure/1.0"
         datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <start>
    <ref name="account"/>
  </start>
  <define name="account">
    <element name="account">
      <attribute name="accountNo">
        <data type="token"/>
      </attribute>
      <element name="balance">
        <data type="int"/>
      </element>
      <element name="owner">
        <data type="token"/>
      </element>
      <ref name="address"/>
      <zeroOrMore>
        <ref name="phone"/>
      </zeroOrMore>
    </element>
  </define>
  <define name="address">
    <element name="address">
      <attribute name="zip">
        <data type="token"/>
      </attribute>
      <text/>
    </element>
  </define>
  <define name="phone">
    <element name="phone">
      <attribute name="area">
        <data type="token"/>
      </attribute>
        <data type="token"/>
    </element>
  </define>
</grammar>

Build

Execution of Relaxer with the java.pattern.context option is as follows:

$ relaxer -java -java.pattern.context javajavaPatternContext.rng

Because the Java generator is a default generator, execution of Relaxer as shown below has the same effect:

$ relaxer -java.pattern.context javajavaPatternContext.rng

As a result, Relaxer generates 12 files:

• Account.java
• Address.java
• Phone.java
• URelaxer.java
• RStack.java
• UJAXP.java
• RContext.java
• IJavaPatternContextFactory.java
• AbstractJavaPatternContextFactory.java
• DefaultJavaPatternContextFactory.java
• JavaPatternContextFactory.java
• IRNode.java

List 7.23.3.2.1[JavaPatternContext.java] is a sample program for the java.pattern.context option.

import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;

public class JavaPatternContext {
    public static void main(String[] args)
	throws IOException, SAXException, ParserConfigurationException {

	String uri = args[0];
	Account account = makeAccount(uri);
	printAccount(account);
    }

    private static Account makeAccount(String uri)
	throws IOException, SAXException, ParserConfigurationException {

	System.out.println("*** makeAccount ***");
	Account account = new Account(uri);
	return (account);
    }

    private static void printAccount(Account account) {
	System.out.println("*** printAccount ***");
	String accountNo = account.getAccountNo();
	long balance = account.getBalance();
	String owner = account.getOwner();
	Address address = account.getAddress();
	String zip = address.getZip();
	String place = address.getContent();
	System.out.println("AccountNo:" + accountNo);
	System.out.println("Balance:" + balance);
	System.out.println("Owner:" + owner);
	System.out.println("Address: [" + zip + "] " + place);
	Phone[] phones = account.getPhone();
	for (int i = 0;i < phones.length;i++) {
	    Phone phone = phones[i];
	    String area = phone.getArea();
	    String number = phone.getContent();
	    System.out.println("Phone: [" + area + "] " + number);
	}
	System.out.println("XML:" + account);
    }
}

Compilation of JavaPatternContext.java class is shown here:

$ javac JavaPatternContext.java

Execution

List 7.23.3.3.1[javapatternContext.xml] is an XML document for testing.

<account accountNo="12345">
  <balance>102030</balance>
  <owner>XML Taro</owner>
  <address zip="213">Yokohama</address>
  <phone area="123">456-7890</phone>
  <phone area="090">123-4567</phone>
</account>

Execution of the JavaPatternContext class is shown here:

$ java JavaPatternContext javaPatternContext.xml
AccountNo:12345
Balance:102030
Owner:XML Taro
XML:<account xmlns="http://example.com/account" \
    accountNo="12345"><balance>102030</balance><owner>XML \
    Taro</owner></account>