/*
* Copyright 2015 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.
*
* 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.jbpm.process.builder.dialect.mvel;
import org.drools.compiler.compiler.DescrBuildError;
import org.drools.compiler.lang.descr.ActionDescr;
import org.drools.compiler.rule.builder.PackageBuildContext;
import org.drools.compiler.rule.builder.dialect.mvel.MVELAnalysisResult;
import org.drools.compiler.rule.builder.dialect.mvel.MVELDialect;
import org.drools.core.base.mvel.MVELCompilationUnit;
import org.drools.core.rule.MVELDialectRuntimeData;
import org.jbpm.process.builder.ActionBuilder;
import org.jbpm.process.builder.ProcessBuildContext;
import org.jbpm.process.core.ContextResolver;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.process.instance.impl.MVELAction;
import org.jbpm.workflow.core.DroolsAction;
import org.mvel2.Macro;
import org.mvel2.MacroProcessor;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class MVELActionBuilder extends AbstractMVELBuilder implements ActionBuilder {
private static final Map<String, Macro> macros = new HashMap<String, Macro>( 5 );
static {
macros.put( "insert",
new Macro() {
public String doMacro() {
return "kcontext.getKnowledgeRuntime().insert";
}
} );
// macros.put( "insertLogical",
// new Macro() {
// public String doMacro() {
// return "kcontext.getKnowledgeRuntime()..insertLogical";
// }
// } );
// macros.put( "update",
// new Macro() {
// public String doMacro() {
// return "kcontext.getKnowledgeRuntime().update";
// }
// } );
// macros.put( "retract",
// new Macro() {
// public String doMacro() {
// return "kcontext.getKnowledgeRuntime().retract";
// }
// } );;
}
public MVELActionBuilder() {
}
public static String processMacros(String consequence) {
MacroProcessor macroProcessor = new MacroProcessor();
macroProcessor.setMacros( macros );
return macroProcessor.parse( delimitExpressions( consequence ) );
}
public void build(final PackageBuildContext context,
final DroolsAction action,
final ActionDescr actionDescr,
final ContextResolver contextResolver) {
String text = processMacros( actionDescr.getText() );
Map<String, Class<?>> variables = new HashMap<String,Class<?>>();
try {
MVELDialect dialect = (MVELDialect) context.getDialect( "mvel" );
MVELAnalysisResult analysis = getAnalysis(context, actionDescr, dialect, text, variables);
if ( analysis == null ) {
// not possible to get the analysis results
return;
}
buildAction(context,
action,
actionDescr,
contextResolver,
dialect,
analysis,
text,
variables);
} catch ( final Exception e ) {
context.getErrors().add( new DescrBuildError( context.getParentDescr(),
actionDescr,
null,
"Unable to build expression for action '" + actionDescr.getText() + "' :" + e ) );
}
}
protected void buildAction(final PackageBuildContext context,
final DroolsAction action,
final ActionDescr actionDescr,
final ContextResolver contextResolver,
final MVELDialect dialect,
final MVELAnalysisResult analysis,
final String text,
Map<String, Class<?>> variables) throws Exception {
Set<String> variableNames = analysis.getNotBoundedIdentifiers();
if (contextResolver != null) {
for (String variableName: variableNames) {
if ( analysis.getMvelVariables().keySet().contains( variableName )
|| variableName.equals( "kcontext" )
|| variableName.equals( "context" ) ) {
continue;
}
VariableScope variableScope
= (VariableScope) contextResolver.resolveContext(VariableScope.VARIABLE_SCOPE, variableName);
if (variableScope == null) {
context.getErrors().add(
new DescrBuildError(context.getParentDescr(),
actionDescr,
null,
"Could not find variable '" + variableName + "' "
+ "for action '" + actionDescr.getText() + "'" ) );
} else {
variables.put(variableName,
context.getDialect().getTypeResolver().resolveType(
variableScope.findVariable(variableName).getType().getStringType()));
}
}
}
MVELCompilationUnit unit = dialect.getMVELCompilationUnit( text,
analysis,
null,
null,
variables,
context,
"context",
org.kie.api.runtime.process.ProcessContext.class,
false,
MVELCompilationUnit.Scope.EXPRESSION);
MVELAction expr = new MVELAction( unit, context.getDialect().getId() );
action.setMetaData("Action", expr );
MVELDialectRuntimeData data
= (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( dialect.getId() );
data.addCompileable( action, expr );
expr.compile( data );
collectTypes("MVELDialect", analysis, (ProcessBuildContext) context);
}
}