/**
* Copyright 2010 JBoss Inc
*
* 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.jsr94.rules.admin;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.util.Map;
import javax.rules.admin.LocalRuleExecutionSetProvider;
import javax.rules.admin.RuleExecutionSet;
import javax.rules.admin.RuleExecutionSetCreateException;
import org.drools.IntegrationException;
import org.drools.compiler.DroolsParserException;
import org.drools.compiler.PackageBuilder;
import org.drools.compiler.PackageBuilderConfiguration;
import org.drools.decisiontable.InputType;
import org.drools.decisiontable.SpreadsheetCompiler;
import org.drools.jsr94.rules.Constants;
import org.drools.rule.Package;
/**
* The Drools implementation of the <code>LocalRuleExecutionSetProvider</code>
* interface which defines <code>RuleExecutionSet</code> creation methods for
* defining <code>RuleExecutionSet</code>s from local (non-serializable)
* resources.
*
* @see LocalRuleExecutionSetProvider
*
* @author N. Alex Rupp (n_alex <at>codehaus.org)
* @author <a href="mailto:thomas.diesler@softcon-itec.de">thomas diesler </a>
* @author <a href="mailto:michael.frandsen@syngenio.de">michael frandsen </a>
*/
public class LocalRuleExecutionSetProviderImpl
implements
LocalRuleExecutionSetProvider {
/** Default constructor. */
public LocalRuleExecutionSetProviderImpl() {
super();
}
/**
* Creates a <code>RuleExecutionSet</code> implementation using a supplied
* input stream and additional Drools-specific properties. A Drools-specific
* rule execution set is read from the supplied InputStream. The method
* <code>createRuleExecutionSet</code> taking a Reader instance should be
* used if the source is a character stream and encoding conversion should
* be performed.
*
* @param ruleExecutionSetStream
* an input stream used to read the rule execution set.
* @param properties
* additional properties used to create the
* <code>RuleExecutionSet</code> implementation. May be
* <code>null</code>.
*
* @throws RuleExecutionSetCreateException
* on rule execution set creation error.
*
* @return The created <code>RuleExecutionSet</code>.
*/
public RuleExecutionSet createRuleExecutionSet(final InputStream ruleExecutionSetStream,
final Map properties) throws RuleExecutionSetCreateException {
if ( properties != null ) {
String source = ( String ) properties.get( Constants.RES_SOURCE );
if ( source == null ) {
// support legacy name
source = ( String ) properties.get( "source" );
}
if ( source != null && source.equals( Constants.RES_SOURCE_TYPE_DECISION_TABLE ) ) {
final SpreadsheetCompiler converter = new SpreadsheetCompiler();
final String drl = converter.compile( ruleExecutionSetStream,
InputType.XLS );
return createRuleExecutionSet( new StringReader( drl ), properties );
} else {
return createRuleExecutionSet( new InputStreamReader( ruleExecutionSetStream ), properties);
}
} else
return createRuleExecutionSet( new InputStreamReader( ruleExecutionSetStream ), properties);
}
/**
* Creates a <code>RuleExecutionSet</code> implementation using a supplied
* character stream Reader and additional Drools-specific properties. A
* Drools-specific rule execution set is read from the supplied Reader.
*
* @param ruleExecutionSetReader
* a Reader used to read the rule execution set.
* @param properties
* additional properties used to create the
* <code>RuleExecutionSet</code> implementation. May be
* <code>null</code>.
*
* @throws RuleExecutionSetCreateException
* on rule execution set creation error.
*
* @return The created <code>RuleExecutionSet</code>.
*/
public RuleExecutionSet createRuleExecutionSet(final Reader ruleExecutionSetReader,
final Map properties) throws RuleExecutionSetCreateException {
try {
PackageBuilderConfiguration config= null;
if ( properties != null ) {
config = (PackageBuilderConfiguration) properties.get( Constants.RES_PACKAGEBUILDER_CONFIG );
}
PackageBuilder builder = null;
if ( config != null ) {
builder = new PackageBuilder(config);
} else {
builder = new PackageBuilder();
}
Object dsrl = null;
String source = null;
if ( properties != null ) {
dsrl = properties.get( Constants.RES_DSL );
if ( dsrl == null ) {
// check for old legacy name ending
dsrl = properties.get( "dsl" );
}
source = ( String ) properties.get( Constants.RES_SOURCE );
if ( source == null ) {
// check for old legacy name ending
source = ( String ) properties.get( "source" );
}
}
if ( source == null ) {
source = "drl";
}
if ( dsrl == null ) {
if ( source.equals( Constants.RES_SOURCE_TYPE_XML ) || source.equals( "xml" ) ) {
builder.addPackageFromXml( ruleExecutionSetReader );
} else {
builder.addPackageFromDrl( ruleExecutionSetReader );
}
} else {
if ( source.equals( Constants.RES_SOURCE_TYPE_XML ) || source.equals( "xml" ) ) {
// xml cannot specify a dsl
builder.addPackageFromXml( ruleExecutionSetReader );
} else {
if ( dsrl instanceof Reader ) {
builder.addPackageFromDrl( ruleExecutionSetReader,
(Reader) dsrl );
} else {
builder.addPackageFromDrl( ruleExecutionSetReader,
new StringReader( (String) dsrl ) );
}
}
}
final Package pkg = builder.getPackage();
return createRuleExecutionSet( pkg,
properties );
} catch ( final IOException e ) {
throw new RuleExecutionSetCreateException( "cannot create rule execution set",
e );
} catch ( final DroolsParserException e ) {
throw new RuleExecutionSetCreateException( "cannot create rule execution set",
e );
}
}
/**
* Creates a <code>RuleExecutionSet</code> implementation from a
* Drools-specific AST representation and Drools-specific properties.
*
* @param ruleExecutionSetAst
* the vendor representation of a rule execution set
* @param properties
* additional properties used to create the
* <code>RuleExecutionSet</code> implementation. May be
* <code>null</code>.
*
* @throws RuleExecutionSetCreateException
* on rule execution set creation error.
*
* @return The created <code>RuleExecutionSet</code>.
*/
public RuleExecutionSet createRuleExecutionSet(final Object ruleExecutionSetAst,
final Map properties) throws RuleExecutionSetCreateException {
if ( ruleExecutionSetAst instanceof Package ) {
final Package pkg = (Package) ruleExecutionSetAst;
return this.createRuleExecutionSet( pkg,
properties );
}
throw new RuleExecutionSetCreateException( " Incoming AST object must be an org.drools.rule.Package. Was " + ruleExecutionSetAst.getClass() );
}
/**
* Creates a <code>RuleExecutionSet</code> implementation from a
* <code>RuleSet</code> and Drools-specific properties.
*
* @param pkg
* a Drools <code>org.drools.rule.Package</code> representation
* of a rule execution set.
* @param properties
* additional properties used to create the RuleExecutionSet
* implementation. May be <code>null</code>.
*
* @throws RuleExecutionSetCreateException
* on rule execution set creation error.
*
* @return The created <code>RuleExecutionSet</code>.
*/
private RuleExecutionSet createRuleExecutionSet(final Package pkg,
final Map properties) throws RuleExecutionSetCreateException {
try {
return new RuleExecutionSetImpl( pkg,
properties );
} catch ( final IntegrationException e ) {
throw new RuleExecutionSetCreateException( "Failed to create RuleExecutionSet",
e );
}
}
}