/*
* Copyright 2005 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.guvnor.server.contenthandler;
import java.io.IOException;
import java.io.StringReader;
import java.util.StringTokenizer;
import org.drools.compiler.DroolsParserException;
import org.drools.guvnor.client.rpc.RuleAsset;
import org.drools.guvnor.client.rpc.RuleContentText;
import org.drools.guvnor.server.builder.BRMSPackageBuilder;
import org.drools.guvnor.server.builder.ContentPackageAssembler;
import org.drools.repository.AssetItem;
public class DRLFileContentHandler extends PlainTextContentHandler
implements
IRuleAsset {
public void compile(BRMSPackageBuilder builder,
AssetItem asset,
ContentPackageAssembler.ErrorLogger logger) throws DroolsParserException,
IOException {
String content = getRawDRL( asset );
if ( content != null && !content.trim().equals( "" ) ) {
builder.addPackageFromDrl( new StringReader( content ) );
}
}
public void compile(BRMSPackageBuilder builder,
RuleAsset asset,
ContentPackageAssembler.ErrorLogger logger) throws DroolsParserException,
IOException {
String content = ((RuleContentText) asset.content).content;
if ( content != null && !content.trim().equals( "" ) ) {
builder.addPackageFromDrl( new StringReader( content ) );
}
}
String wrapRuleDeclaration(String name,
String parentName,
String content) {
if ( parentName == null || "".equals( parentName ) ) {
return "rule '" + name + "'\n" + getContent( content ) + "\nend";
} else {
return "rule '" + name + "' extends " + parentName + "\n" + getContent( content ) + "\nend";
}
}
String getContent(String content) {
if ( content != null && content.indexOf( "dialect" ) == -1 ) {
return "dialect 'mvel'\n" + content;
}
return content;
}
/**
* This will try and sniff ouf if its a stand alone rule which
* will use the asset name as the rule name, or if it should be treated as a package
* (in the latter case, the content is passed as it to the compiler).
*/
public static boolean isStandAloneRule(String content) {
if ( content == null || "".equals( content.trim() ) ) {
return false;
}
StringTokenizer st = new StringTokenizer( content,
"\n\r" );
while ( st.hasMoreTokens() ) {
String tok = st.nextToken().trim();
if ( tok.startsWith( "when" ) ) {
//well obviously it is stand alone...
return true;
}
//otherwise sniff for a suitable keyword at the start of a line
if ( startsWithWord( "package",
tok ) || startsWithWord( "rule",
tok ) || startsWithWord( "end",
tok ) || startsWithWord( "function",
tok ) || startsWithWord( "query",
tok ) ) {
return false;
}
}
return true;
}
static boolean startsWithWord(String word,
String sentence) {
String[] words = sentence.trim().split( "\\s" );
if ( words.length > 0 ) {
return words[0].equals( word );
} else {
return false;
}
}
public void assembleDRL(BRMSPackageBuilder builder,
RuleAsset asset,
StringBuffer buf) {
String content = ((RuleContentText) asset.content).content;
if ( isStandAloneRule( content ) ) {
content = wrapRuleDeclaration( asset.metaData.name,
"",
content );
}
buf.append( content );
}
public void assembleDRL(BRMSPackageBuilder builder,
AssetItem asset,
StringBuffer buf) {
String content = getRawDRL( asset );
buf.append( content );
}
public String getRawDRL(AssetItem asset) {
String content = asset.getContent();
if ( isStandAloneRule( content ) ) {
String parentName = this.parentNameFromCategory( asset,
"" );
content = wrapRuleDeclaration( asset.getName(),
parentName,
content );
}
return content;
}
}