org.mapfish.print.processor.http

Class CompositeClientHttpRequestFactoryProcessor

java.lang.Object

org.mapfish.print.processor.AbstractProcessor<Values,ClientHttpFactoryProcessorParam>

org.mapfish.print.processor.http.CompositeClientHttpRequestFactoryProcessor

All Implemented Interfaces:

ConfigurationObject, HttpProcessor<Values>, Processor<Values,ClientHttpFactoryProcessorParam>

public final class CompositeClientHttpRequestFactoryProcessor
extends AbstractProcessor<Values,ClientHttpFactoryProcessorParam>
implements HttpProcessor<Values>

A processor that wraps several AbstractClientHttpRequestFactoryProcessors.

This makes it more convenient to configure multiple processors that modify MfClientHttpRequestFactory objects.

Consider the case where you need to:

• Restrict allowed URIS using the !restrictUris processor
• Forward all headers from print request to all requests using !forwardHeaders
• Change the url using the !mapUri processor

In this case the !mapUri processor must execute before the !restrictUris processor but it is difficult to enforce this, the inputMapping and outputMapping must be carefully designed in order to do it. The following should work but compare it with the example below:

 - !mapUri
   mapping:
     (http)://localhost(.*) : "$1://127.0.0.1$2"
   outputMapper: {clientHttpRequestFactory: clientHttpRequestFactoryMapped}
 - !forwardHeaders
   all: true
   inputMapper: {clientHttpRequestFactoryMapped :clientHttpRequestFactory}
   outputMapper: {clientHttpRequestFactory: clientHttpRequestFactoryWithHeaders}
 - !restrictUris
   matchers: [!localMatch {}]
   inputMapper: {clientHttpRequestFactoryWithHeaders:clientHttpRequestFactory}
     

The recommended way to write the above configuration is as follows:

 - !configureHttpRequests
   httpProcessors:
     - !mapUri
       mapping:
         (http)://localhost(.*) : "$1://127.0.0.1$2"
     - !forwardHeaders
       all: true
     - !restrictUris
       matchers: [!localMatch {}]
 

[[examples=http_processors]]

Nested Class Summary

Nested classes/interfaces inherited from class org.mapfish.print.processor.AbstractProcessor

AbstractProcessor.Context

Nested classes/interfaces inherited from interface org.mapfish.print.processor.Processor

Processor.ExecutionContext

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CompositeClientHttpRequestFactoryProcessor() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
MfClientHttpRequestFactory	createFactoryWrapper(Values values, MfClientHttpRequestFactory requestFactory) Create the MfClientHttpRequestFactory to use.
Values	createInputParameter() Returns a new/clean instance of a parameter object.
ClientHttpFactoryProcessorParam	execute(Values values, Processor.ExecutionContext context) Perform the process on the input attributes.
protected void	extraValidation(java.util.List<java.lang.Throwable> validationErrors, Configuration configuration) Perform any extra validation a subclass may need to perform.
void	setHttpProcessors(java.util.List<HttpProcessor> httpProcessors) Sets all the http processors that will executed by this processor.

Methods inherited from class org.mapfish.print.processor.AbstractProcessor

checkCancelState, getInputMapperBiMap, getInputPrefix, getOutputMapperBiMap, getOutputPrefix, getOutputType, setInputMapper, setInputPrefix, setOutputMapper, setOutputPrefix, setPrefix, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.mapfish.print.processor.Processor

getInputMapperBiMap, getInputPrefix, getOutputMapperBiMap, getOutputPrefix, getOutputType

Methods inherited from interface org.mapfish.print.config.ConfigurationObject

validate

Constructor Detail

CompositeClientHttpRequestFactoryProcessor

protected CompositeClientHttpRequestFactoryProcessor()

Constructor.

Method Detail

setHttpProcessors

public void setHttpProcessors(java.util.List<HttpProcessor> httpProcessors)

Sets all the http processors that will executed by this processor.

Parameters:

httpProcessors - the sub processors

createFactoryWrapper

public MfClientHttpRequestFactory createFactoryWrapper(Values values,
                                              MfClientHttpRequestFactory requestFactory)

Description copied from interface: HttpProcessor

Create the MfClientHttpRequestFactory to use.

Specified by:

createFactoryWrapper in interface HttpProcessor<Values>

Parameters:

values - extra parameters required to create the updated request factory

requestFactory - the basic request factory. It should be unmodified and just wrapped with a proxy class.

extraValidation

protected void extraValidation(java.util.List<java.lang.Throwable> validationErrors,
                   Configuration configuration)

Description copied from class: AbstractProcessor

Perform any extra validation a subclass may need to perform.

Specified by:

extraValidation in class AbstractProcessor<Values,ClientHttpFactoryProcessorParam>

Parameters:

validationErrors - a list to add errors to so that all validation errors are reported as one.

configuration - the containing configuration

createInputParameter

@Nullable
public Values createInputParameter()

Description copied from interface: Processor

Returns a new/clean instance of a parameter object. This instance's will be inspected using reflection to find its public fields and the properties will be set from the Values object.

The way the properties will be looked up is to

1. take the bean property name
2. map it using the input mapper, (if the input mapper does not have a mapping for the property then the unmapped property name is used)
3. Look up the property value in the Values object using the mapped property name
4. set the value on the instance created by this method. If the value is null an exception will be thrown UNLESS the HasDefaultValue annotation is on the field for the property.

The populated instance will be passed to the execute method. It is imperative that a new instance is created each time because they will be used in a multi-threaded environment and thus the same processor instance may be ran in multiple threads with different instances of the parameter object.

It is important to realize that super classes will also be analyzed, so care must be had with inheritance.

Specified by:

createInputParameter in interface Processor<Values,ClientHttpFactoryProcessorParam>

execute

@Nullable
public ClientHttpFactoryProcessorParam execute(Values values,
                                               Processor.ExecutionContext context)
                                        throws java.lang.Exception

Description copied from interface: Processor

Perform the process on the input attributes.

Specified by:

execute in interface Processor<Values,ClientHttpFactoryProcessorParam>

Parameters:

values - A Java object whose public fields are populated from the Values object (which is used for transferring properties between processors).

context - The execution context for a print task.

Returns:

A Java object whose public fields will be put into the Values object. The key in the Values object is the name of the field or if there is a mapping in the Processor.getOutputMapperBiMap() map, the mapped name. The key is determined in a similar way as for the input object.

Throws:

java.lang.Exception