com.tangosol.config.xml.ProcessingContext Maven / Gradle / Ivy
/*
* Copyright (c) 2000, 2020, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
package com.tangosol.config.xml;
import com.tangosol.config.ConfigurationException;
import com.tangosol.config.expression.ExpressionParser;
import com.tangosol.config.expression.ParameterResolver;
import com.tangosol.run.xml.XmlAttribute;
import com.tangosol.run.xml.XmlDocument;
import com.tangosol.run.xml.XmlElement;
import com.tangosol.util.ResourceRegistry;
import com.tangosol.util.ResourceResolver;
import java.lang.reflect.Type;
import java.net.URI;
import java.util.Map;
/**
* A {@link ProcessingContext} provides contextual information concerning the processing of content in an xml document.
*
* {@link ProcessingContext}s additionally provide mechanisms to:
*
* - Request processing of other, typically sub xml content, like child {@link XmlElement}s.
*
*
- Access the {@link ResourceRegistry} provided to the {@link DocumentProcessor} associated with the
* {@link XmlDocument} being processed.
*
*
- Access the {@link ParameterResolver} provided to the {@link DocumentProcessor} associated with the
* {@link XmlDocument} being processed.
*
*
- Define additional contextual state (such as cookies) that may be used for injecting values into beans
* during processing.
*
*
- Define specialized {@link ElementProcessor}s and {@link AttributeProcessor}s that may be used for
* processing and injecting beans in the {@link ProcessingContext}.
*
*
* @author bo 2011.06.15
* @since Coherence 12.1.2
*/
public interface ProcessingContext
extends ResourceResolver
{
/**
* Obtains the {@link ResourceRegistry} associated with the {@link ProcessingContext}.
*
* @return a {@link ResourceRegistry}
*/
public ResourceRegistry getResourceRegistry();
/**
* Obtains the {@link ClassLoader} to use for loading classes in the {@link ProcessingContext}.
*
* @return {@link ClassLoader}
*/
public ClassLoader getContextClassLoader();
/**
* Obtains the {@link ParameterResolver} to use for resolving parameters
* defined externally to the document being processed (ie: the
* operating system or container)
*
* @return the default {@link ParameterResolver}.
*/
public ParameterResolver getDefaultParameterResolver();
/**
* Adds the specified named and typed cookie to the {@link ProcessingContext}.
*
* If a cookie with the same name and type exists in the {@link ProcessingContext}, it will be replaced by the
* specified cookie. If a cookie with the same name and type has been defined in an outer {@link ProcessingContext},
* the specified cookie will hide the cookie defined in the outer {@link ProcessingContext}.
*
* @param the type of the cookie
* @param clzCookie the class of the cookie
* @param sCookieName the name of the cookie
* @param cookie the cookie value
*/
public void addCookie(Class clzCookie, String sCookieName, T cookie);
/**
* Adds the specified cookie to the {@link ProcessingContext}.
*
* If a cookie of the same type and name (being the name of the class of
* the said cookie) is already registered with the {@link ProcessingContext},
* it will be replaced by the specified cookie.
*
* If a cookie of the same type and name has been defined in an outer
* {@link ProcessingContext}, the specified cookie will hide the cookie
* defined in the outer {@link ProcessingContext}.
*
* This method is equivalent to calling:
* addCookie(clz, clz.getName(), cookie);
*
* @param the type of the cookie
* @param clzCookie the class of the cookie
* @param cookie the cookie value
*/
public void addCookie(Class clzCookie, T cookie);
/**
* Locates and returns the cookie with the specified type and name.
*
* Locating the cookie involves searching the current
* {@link ProcessingContext} for a matching cookie. If one is not found,
* the search continues with outer {@link ProcessingContext}s until a
* cookie is either located or there are no more {@link ProcessingContext}s,
* in which case null is returned.
*
* @param the type of the cookie
* @param clzCookie the class of the cookie
* @param sCookieName the name of the cookie
*
* @return the cookie or null if not defined
*/
public T getCookie(Class clzCookie, String sCookieName);
/**
* Locates and returns the cookie with the specified type.
*
* Locating the cookie involves searching the current
* {@link ProcessingContext} for a matching cookie. If one is not found,
* the search continues with outer {@link ProcessingContext}s until a
* cookie is either located or there are no more {@link ProcessingContext}s,
* in which case null is returned.
*
* This method is equivalent to calling:
* getCookie(clz, clz.getName());
*
* @param the type of the cookie
* @param clzCookie the class of the cookie
*
* @return the cookie or null if not defined
*/
public T getCookie(Class clzCookie);
/**
* Defines the xml path to locate a specific Java Bean property with in an {@link XmlElement} in the
* {@link ProcessingContext}.
*
* This method allows "alias" paths for Java Bean properties to be defined so that {@link #inject(Object, XmlElement)}
* calls may resolve property values correctly.
*
* This is an advanced feature. Typically this is only used when:
*
* - A Java Bean property name does not match a named value, {@link XmlElement} or {@link XmlAttribute}
* with in a {@link ProcessingContext}.
*
- A Java Bean property can not be located with in the {@link ProcessingContext}.
*
*
* @param sBeanPropertyName the property name of the bean
* @param sXmlPath the xmlPath to the property value
*/
public void definePropertyPath(String sBeanPropertyName, String sXmlPath);
/**
* Registers an {@link AttributeProcessor} that may be used to process specific types of values
* contained in {@link XmlAttribute}s with in the {@link ProcessingContext}.
*
* When an {@link AttributeProcessor} isn't provided by the associated {@link NamespaceHandler} for an
* {@link XmlAttribute}, an attempt is made to use a type specific {@link AttributeProcessor} to process an
* {@link XmlAttribute} for injection (with {@link #inject(Object, XmlElement)}).
*
* @param the type
* @param clzType the {@link Class} type
* @param processor the {@link AttributeProcessor} for the type
*/
public void registerProcessor(Class clzType, AttributeProcessor processor);
/**
* Registers an {@link ElementProcessor} that may be used to process specific types of values
* contained in {@link XmlElement}s with in the {@link ProcessingContext}.
*
* When an {@link ElementProcessor} isn't provided by the associated {@link NamespaceHandler} for an
* {@link XmlElement}, an attempt is made to use a type specific {@link ElementProcessor} to process an
* {@link XmlElement} for injection (with {@link #inject(Object, XmlElement)}).
*
* @param the type
* @param clzType the {@link Class} type
* @param processor the {@link ElementProcessor} for the type
*/
public void registerProcessor(Class clzType, ElementProcessor processor);
/**
* Automatically creates and registers an {@link AttributeProcessor} for the specified type.
*
* Note: This assumes the type supports a {@link String}-based or {@link XmlAttribute}-based constructor.
*
* @param the type
* @param clzType the type for which to create and register an {@link AttributeProcessor}
*/
public void registerAttributeType(Class clzType);
/**
* Automatically creates and registers an {@link ElementProcessor} for the specified type.
*
* Note: This assumes the type supports a {@link String}-based or {@link XmlElement}-based constructor.
*
* @param the type
* @param clzType the type for which to create and register an {@link ElementProcessor}
*/
public void registerElementType(Class clzType);
/**
* Obtains the configured {@link ExpressionParser} for this {@link ProcessingContext}.
*
* @return the {@link ExpressionParser}
*/
public ExpressionParser getExpressionParser();
/**
* Ensures that an {@link NamespaceHandler} with the specified {@link URI} is available for use in the
* {@link ProcessingContext} with the specified prefix. If a {@link NamespaceHandler} with the specified
* prefix and {@link URI} is not defined by the {@link ProcessingContext}, one is instantiated, registered
* and returned.
*
* @param sPrefix the prefix of the Xml Namespace to use for the {@link NamespaceHandler}
* @param uri the {@link URI} detailing the location of the {@link NamespaceHandler}. Typically this
* will be a java class URI, specified as "class://fully.qualified.class.name"
*
* @return an instance of the {@link NamespaceHandler} that is suitable for processing the prefix and {@link URI}
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public NamespaceHandler ensureNamespaceHandler(String sPrefix, URI uri);
/**
* Ensures that the specified {@link NamespaceHandler} for the specified prefix is defined in this
* {@link ProcessingContext}.
*
* If a {@link NamespaceHandler} for the prefix does not exist in the {@link ProcessingContext}, it is added.
* Otherwise the existing {@link NamespaceHandler} for the prefix is returned.
*
* @param sPrefix the prefix of the xml Namespace to be associated with the {@link NamespaceHandler}
* @param handler the {@link NamespaceHandler}
*
* @return the registered {@link NamespaceHandler} for the {@link ProcessingContext}
*/
public NamespaceHandler ensureNamespaceHandler(String sPrefix, NamespaceHandler handler);
/**
* Obtains the {@link NamespaceHandler} that is capable of processing the namespace defined with the specified
* {@link URI}.
*
* @param uri the Xml Namespace {@link URI} of the {@link NamespaceHandler} to locate
*
* @return null if a {@link NamespaceHandler} could not be located for the specified {@link URI}
*/
public NamespaceHandler getNamespaceHandler(URI uri);
/**
* Obtains the {@link NamespaceHandler} which is capable of processing the namespace with the specified prefix.
*
* @param sPrefix the prefix of the xml namespace
*
* @return null if a {@link NamespaceHandler} could not be located for the specified prefix
*/
public NamespaceHandler getNamespaceHandler(String sPrefix);
/**
* Obtains the {@link URI} that is associated with the specified prefix.
*
* @param sPrefix the XML namespace prefix of the {@link URI} to locate
*
* @return null if a {@link URI} could not be located for the specified {@link URI}
*/
public URI getNamespaceURI(String sPrefix);
/**
* Obtains the {@link NamespaceHandler}s that are currently in scope
* for this {@link ProcessingContext}.
*
* @return An {@link Iterable} over the {@link NamespaceHandler}s in scope.
*/
public Iterable getNamespaceHandlers();
/**
* Request that the document specified by the URI/filename
* (containing the root of an XmlDocument)
* be processed with appropriate {@link NamespaceHandler}s.
*
* Should the document root contain any unrecognized xml namespaces,
* an attempt will be made to load appropriate {@link NamespaceHandler}s
* that of which will be used to process said elements in the document.
*
* @param uri the {@link URI} of the XmlDocument to process
*
* @return the result of the processing the root element of the document
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Object processDocumentAt(URI uri)
throws ConfigurationException;
/**
* Request that the document specified by the URI/filename
* (containing the root of an XmlDocument)
* be processed with appropriate {@link NamespaceHandler}s.
*
* Should the document root contain any unrecognized xml namespaces,
* an attempt will be made to load appropriate {@link NamespaceHandler}s
* that of which will be used to process said elements in the document.
*
* @param sLocation the URI/filename of the XmlDocument to process
*
* @return the result of the processing the root element of the document
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Object processDocumentAt(String sLocation)
throws ConfigurationException;
/**
* Request that the specified {@link XmlElement}
* (representing the root of an XmlDocument)
* be processed with appropriate {@link NamespaceHandler}s.
*
* Should the document root contain any unrecognized xml namespaces,
* an attempt will be made to load appropriate {@link NamespaceHandler}s
* that of which will be used to process said elements in the document.
*
* @param xmlElement the root {@link XmlElement} of the XmlDocument to process
*
* @return the result of the processing the root element of the document
* represented by the {@link XmlElement}
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Object processDocument(XmlElement xmlElement)
throws ConfigurationException;
/**
* Request that the specified xml string
* (representing an xml document) be processed with appropriate
* {@link NamespaceHandler}s.
*
* Should the document root contain any unrecognized xml namespaces,
* an attempt will be made to load appropriate {@link NamespaceHandler}s
* that of which will be used to process said elements in the document.
*
* @param sXml a string containing an xml document to process
*
* @return the result of processing the root element of the document
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Object processDocument(String sXml)
throws ConfigurationException;
/**
* Request the specified {@link XmlElement} to be processed with an appropriate {@link NamespaceHandler}
* known by the {@link ProcessingContext} or outer {@link ProcessingContext}s.
*
* Note: Should the element contain any unrecognized xml namespaces, an attempt will be made to load
* appropriate {@link NamespaceHandler}s that of which will be used to process said elements.
*
* @param xmlElement the {@link XmlElement} to process
*
* @return the result of processing the {@link XmlElement} with an
* appropriate {@link ElementProcessor}
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Object processElement(XmlElement xmlElement)
throws ConfigurationException;
/**
* Request the specified xml string be processed with an appropriate {@link NamespaceHandler}
* known by the {@link ProcessingContext}.
*
* Note: Should the element contain any unrecognized xml namespaces, an attempt will be made to load
* appropriate {@link NamespaceHandler}s that of which will be used to process said elements.
*
* @param sXml the xml to process
*
* @return the result of processing the root element of the specified xml
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Object processElement(String sXml)
throws ConfigurationException;
/**
* Request that all of the child elements contained with in the specified {@link XmlElement} be
* processed using appropriate {@link NamespaceHandler}s known by the {@link ProcessingContext}.
*
* This is a convenience method to aid in the processing of all children of an {@link XmlElement}. The keys
* of the returned {@link Map} represent the id attributes each child {@link XmlElement}. If an {@link XmlElement}
* does not have a specified id attribute, a UUID is generated in it's place.
*
* @param xmlElement the parent {@link XmlElement} of the children to process
*
* @return a {@link Map} from identifiable child {@link XmlElement}s (with id="..." attributes)
* and their corresponding processed values
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Map processElementsOf(XmlElement xmlElement)
throws ConfigurationException;
/**
* Request that all of the child elements contained within the specified {@link XmlElement} that do not belong
* to the namespace of the said {@link XmlElement} are processed using appropriate processes.
*
* This is a convenience method to aid in the processing of all children of an {@link XmlElement}. The keys
* of the returned {@link Map} represent the id attributes each child {@link XmlElement}. If an {@link XmlElement}
* does not have a specified id attribute, a UUID is generated in it's place.
*
* @param xmlElement the parent {@link XmlElement} of the children to process
*
* @return a {@link Map} from identifiable child {@link XmlElement}s (with id="..." attributes)
* and their corresponding processed values
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Map processForeignElementsOf(XmlElement xmlElement)
throws ConfigurationException;
/**
* Request that the only child element contained within the {@link XmlElement} is processed
* using an appropriate {@link NamespaceHandler} known by the {@link ProcessingContext}.
*
* @param the type
* @param xmlElement the {@link XmlElement} in which the child is defined
*
* @return the result of processing the child element
*
* @throws ConfigurationException when a configuration problem was encountered,
* especially if there is zero or more than one child
*/
public T processOnlyElementOf(XmlElement xmlElement)
throws ConfigurationException;
/**
* Request that the last remaining unprocessed child element contained within the specified {@link XmlElement}
* is processed using an appropriate {@link ElementProcessor}.
*
* This is a convenience method to aid in the processing of an unprocessed child {@link XmlElement} of an element.
*
* @param the type
* @param xmlElement the parent {@link XmlElement} of the unprocessed child to process
*
* @return the result of processing the child element
*
* @throws ConfigurationException if there are zero or more than one unprocessed child in the element, or
* if some other {@link ConfigurationException} occurred
*/
public T processRemainingElementOf(XmlElement xmlElement)
throws ConfigurationException;
/**
* Request that the last remaining unprocessed children contained within the specified {@link XmlElement}
* are processed using appropriate {@link ElementProcessor}s.
*
* This is a convenience method to aid in the processing of an unprocessed child {@link XmlElement}s of an element.
* The keys of the returned {@link Map} represent the id attributes each child {@link XmlElement}. If an
* {@link XmlElement} does not have a specified id attribute, a UUID is generated in it's place.
*
* @param xmlElement the parent {@link XmlElement} of the unprocessed children to process
*
* @return a {@link Map} from identifiable child {@link XmlElement}s (with id="..." attributes)
* and their corresponding processed values
*
* @throws ConfigurationException when a configuration problem was encountered
*/
public Map processRemainingElementsOf(XmlElement xmlElement)
throws ConfigurationException;
/**
* Given the information available in the {@link ProcessingContext}, including the cookies, the
* {@link ResourceRegistry} the {@link XmlElement}, its
* {@link XmlAttribute}s and/or children, inject appropriately named and typed values into the specified
* bean (using setter injection).
*
* The order in which values are located for injection is as follows; attributed defined by the element, child
* elements defined by the element, alternative paths to values defined in the {@link ProcessingContext}, cookies
* defined by the {@link ProcessingContext} and finally the {@link ResourceRegistry} associated with the
* {@link ProcessingContext}.
*
* @param the bean type
* @param bean the bean to be injected
* @param xmlElement the {@link XmlElement} from which values will be derived for injection into the bean
*
* @return the provided bean but with properties set based on the available values in the {@link ProcessingContext}
*
* @throws ConfigurationException if a configuration is not valid
*/
public B inject(B bean, XmlElement xmlElement)
throws ConfigurationException;
/**
* Determines if the specified property is defined at the path relative to the specified {@link XmlElement}.
*
* @param sPath the path to the property
* @param xmlElement the {@link XmlElement} in which the property should be searched
*
* @return true if the property is defined, false otherwise
*
* @throws ConfigurationException if a configuration is not valid
*/
public boolean isPropertyDefined(String sPath, XmlElement xmlElement)
throws ConfigurationException;
/**
* Obtains the strongly typed value for the property defined at the path relative to the specified
* {@link XmlElement}. If the property is not defined or is of the incorrect type, a {@link ConfigurationException}
* is thrown.
*
* @param the type of the property
* @param sPath the path to the property
* @param typeProperty the type of the property
* @param xmlElement the {@link XmlElement} containing the properties for the object
*
* @return the property value
*
* @throws ConfigurationException if a configuration is not valid, the property can't be located or is of the
* wrong type
*/
public T getMandatoryProperty(String sPath, Type typeProperty, XmlElement xmlElement)
throws ConfigurationException;
/**
* Obtains the strongly typed value for the property defined at the path relative to the specified
* {@link XmlElement}. If the property is not defined, the defaultValue is returned.
*
* @param the type of the property
* @param sPath the path to the property
* @param typeProperty the type of the property
* @param defaultValue the value to return if the property is not found
* @param xmlElement the {@link XmlElement} containing the properties for the object
*
* @return the property value
*
* @throws ConfigurationException if a configuration is not valid
*/
public T getOptionalProperty(String sPath, Type typeProperty, T defaultValue, XmlElement xmlElement)
throws ConfigurationException;
}