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org.jbpm.bpmn2.xpath.XPATHActionBuilder Maven / Gradle / Ivy
/*
* Copyright 2017 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.jbpm.bpmn2.xpath;
import java.util.HashMap;
import java.util.Map;
import org.drools.compiler.compiler.DescrBuildError;
import org.drools.compiler.lang.descr.ActionDescr;
import org.drools.compiler.rule.builder.PackageBuildContext;
import org.jbpm.process.builder.ActionBuilder;
import org.jbpm.process.core.ContextResolver;
import org.jbpm.workflow.core.DroolsAction;
import org.mvel2.Macro;
import org.mvel2.MacroProcessor;
public class XPATHActionBuilder
implements
ActionBuilder {
private static final Map macros = new HashMap( 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 XPATHActionBuilder() {
}
public void build(final PackageBuildContext context,
final DroolsAction action,
final ActionDescr actionDescr,
final ContextResolver contextResolver) {
String text = processMacros( actionDescr.getText() );
try {
// XPATHDialect dialect = (XPATHDialect) context.getDialect( "XPath" );
//
// Map> variables = new HashMap>();
// variables.put("kcontext", ProcessContext.class);
// variables.put("context", ProcessContext.class);
// Dialect.AnalysisResult analysis = dialect.analyzeBlock( context,
// actionDescr,
// dialect.getInterceptors(),
// text,
// new Map[]{variables, context.getPackageBuilder().getGlobals()},
// null );
//
//
// List variableNames = analysis.getNotBoundedIdentifiers();
// if (contextResolver != null) {
// for (String variableName: variableNames) {
// 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 );
// MVELAction expr = new MVELAction( unit, context.getDialect().getId() );
// expr.setVariableNames(variableNames);
//
//
// action.setMetaData("Action", expr );
//
// MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( dialect.getId() );
// data.addCompileable( action,
// expr );
//
// expr.compile( context.getPackageBuilder().getRootClassLoader() );
} catch ( final Exception e ) {
context.getErrors().add( new DescrBuildError( context.getParentDescr(),
actionDescr,
null,
"Unable to build expression for action '" + actionDescr.getText() + "' :" + e ) );
}
}
public static String processMacros(String consequence) {
MacroProcessor macroProcessor = new MacroProcessor();
macroProcessor.setMacros( macros );
return macroProcessor.parse( delimitExpressions( consequence ) );
}
/**
* Allows newlines to demarcate expressions, as per MVEL command line.
* If expression spans multiple lines (ie inside an unbalanced bracket) then
* it is left alone.
* Uses character based iteration which is at least an order of magnitude faster then a single
* simple regex.
*/
public static String delimitExpressions(String s) {
StringBuilder result = new StringBuilder();
char[] cs = s.toCharArray();
int brace = 0;
int sqre = 0;
int crly = 0;
char lastNonWhite = ';';
for ( int i = 0; i < cs.length; i++ ) {
char c = cs[i];
switch ( c ) {
case '(' :
brace++;
break;
case '{' :
crly++;
break;
case '[' :
sqre++;
break;
case ')' :
brace--;
break;
case '}' :
crly--;
break;
case ']' :
sqre--;
break;
default :
break;
}
if ( (brace == 0 && sqre == 0 && crly == 0) && (c == '\n' || c == '\r') ) {
if ( lastNonWhite != ';' ) {
result.append( ';' );
lastNonWhite = ';';
}
} else if ( !Character.isWhitespace( c ) ) {
lastNonWhite = c;
}
result.append( c );
}
return result.toString();
}
}
