org.drools.compiler.lang.api.AccumulateDescrBuilder Maven / Gradle / Ivy
/*
* Copyright 2011 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.compiler.lang.api;
import org.drools.compiler.lang.descr.AccumulateDescr;
import org.drools.compiler.lang.descr.AndDescr;
/**
* A descriptor builder for Accumulate
*/
public interface AccumulateDescrBuilder>
extends
DescrBuilder {
/**
* Defines the source CE for the Accumulate CE. It is always
* an AND descriptor that contains one or more Patterns and
* other CEs.
*
* @return the CEDescrBuilder for the source CE
*/
public CEDescrBuilder, AndDescr> source();
/**
* For accumulate CEs that use accumulate functions, this call
* instantiate one accumulate function call. Example:
*
* ... accumulate( X(), $sum : sum( $value ) )
*
* Requires the call to this method with parameters:
*
* function( "sum", "$sum", new String[] { "$value" } )
*
* Please note that accumulate supports multiple function calls
* and this method should be called for each function call.
*
* Accumulate uses either accumulate functions or the custom
* code blocks (init/action/reverse/result). It is not possible
* to mix them.
*
* @param name the name of the function being called. Mandatory non-null parameter.
* @param bind the name of the bound variable if there is one. Null if no binding should be made.
* @param isUnification true if the bound variable is expected to unify with the result of the acc function. false otherwise
*@param parameters the array of parameters to the function.
* @return itself, so that it can be used as a fluent API
*/
public AccumulateDescrBuilder function( String name, String bind, boolean isUnification, String... parameters );
/**
* For accumulate CEs that use custom code blocks, this call
* sets the content of the init code block. Please node that the
* use of custom code blocks is discouraged, as they are usually
* a bad practice.
*
* Accumulate uses either accumulate functions or the custom
* code blocks (init/action/reverse/result). It is not possible
* to mix them.
*
* @param block the code for this block
*
* @return itself, so that it can be used as a fluent API
*/
public AccumulateDescrBuilder
init( String block );
/**
* For accumulate CEs that use custom code blocks, this call
* sets the content of the action code block. Please node that the
* use of custom code blocks is discouraged, as they are usually
* a bad practice.
*
* Accumulate uses either accumulate functions or the custom
* code blocks (init/action/reverse/result). It is not possible
* to mix them.
*
* @param block the code for this block
*
* @return itself, so that it can be used as a fluent API
*/
public AccumulateDescrBuilder
action( String block );
/**
* For accumulate CEs that use custom code blocks, this call
* sets the content of the reverse code block. Please node that the
* use of custom code blocks is discouraged, as they are usually
* a bad practice.
*
* Accumulate uses either accumulate functions or the custom
* code blocks (init/action/reverse/result). It is not possible
* to mix them.
*
* @param block the code for this block
*
* @return itself, so that it can be used as a fluent API
*/
public AccumulateDescrBuilder
reverse( String block );
/**
* For accumulate CEs that use custom code blocks, this call
* sets the content of the result expression. Please node that the
* use of custom code blocks is discouraged, as they are usually
* a bad practice.
*
* Accumulate uses either accumulate functions or the custom
* code blocks (init/action/reverse/result). It is not possible
* to mix them.
*
* @param expr the return expr
*
* @return itself, so that it can be used as a fluent API
*/
public AccumulateDescrBuilder
result( String expr );
public P end();
public AccumulateDescrBuilder
constraint( String constr );
}