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## org.apache.cayenne.access.jdbc
Class ChainDirective

    java.lang.Object
      org.apache.velocity.runtime.directive.Directive
          org.apache.cayenne.access.jdbc.ChainDirective

All Implemented Interfaces:
  java.lang.Cloneable, org.apache.velocity.runtime.directive.DirectiveConstants

    public class ChainDirective

extends org.apache.velocity.runtime.directive.Directive

A custom Velocity directive to conditionally join a number of `chunks`. Usage of chain is the following:

     #chain(operator) - e.g. #chain(' AND ')
     #chain(operator prefix) - e.g. #chain(' AND ' 'WHERE ')

`operator` (e.g. AND, OR, etc.) is used to join chunks that are included in a chain. `prefix` is inserted if a chain contains at least one chunk.

Since:
  1.1
Author:
  Andrei Adamchik

Field Summary

Fields inherited from class org.apache.velocity.runtime.directive.Directive
`rsvc`

Fields inherited from interface org.apache.velocity.runtime.directive.DirectiveConstants
`BLOCK, LINE`

Constructor Summary
`ChainDirective()`

Method Summary
`java.lang.String` | `getName()`
`int` | `getType()`
`boolean` | `render(org.apache.velocity.context.InternalContextAdapter context, java.io.Writer writer, org.apache.velocity.runtime.parser.node.Node node)`

Methods inherited from class org.apache.velocity.runtime.directive.Directive
`getColumn, getLine, init, setLocation`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ChainDirective

    public ChainDirective()

Method Detail

### getName

    public java.lang.String getName()

  Specified by:
    `getName` in class `org.apache.velocity.runtime.directive.Directive`

### getType

    public int getType()

  Specified by:
    `getType` in class `org.apache.velocity.runtime.directive.Directive`

### render

    public boolean render(org.apache.velocity.context.InternalContextAdapter context,
                          java.io.Writer writer,
                          org.apache.velocity.runtime.parser.node.Node node)
                   throws java.io.IOException,
                          org.apache.velocity.exception.ResourceNotFoundException,
                          org.apache.velocity.exception.ParseErrorException,
                          org.apache.velocity.exception.MethodInvocationException

  Specified by:
    `render` in class `org.apache.velocity.runtime.directive.Directive`
  Throws:
    `java.io.IOException`
    `org.apache.velocity.exception.ResourceNotFoundException`
    `org.apache.velocity.exception.ParseErrorException`
    `org.apache.velocity.exception.MethodInvocationException`

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