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| package org.drools.io; |
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| import java.util.HashSet; |
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| import org.drools.rule.Declaration; |
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| import org.drools.rule.InvalidRuleException; |
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| import org.drools.rule.Rule; |
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| import org.xml.sax.Attributes; |
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| import org.xml.sax.SAXException; |
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| import org.xml.sax.SAXParseException; |
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| class ParameterHandler extends BaseAbstractHandler implements Handler |
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| { |
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| ParameterHandler( RuleSetReader ruleSetReader )
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| { |
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| this.ruleSetReader = ruleSetReader;
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| if ( this.validParents == null && validPeers == null )
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| { |
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| this.validParents = new HashSet( );
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| this.validParents.add( Rule.class );
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| this.validPeers = new HashSet( );
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| this.validPeers.add( null );
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| this.validPeers.add( Declaration.class );
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| this.allowNesting = false;
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| } |
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| } |
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| public Object start( String uri, String localName, Attributes attrs ) throws SAXException
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| { |
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| Rule rule = (Rule) ruleSetReader.getParent( Rule.class );
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| String identifier = attrs.getValue( "identifier" );
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| if ( identifier == null || identifier.trim( ).equals( "" ) )
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| { |
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| throw new SAXParseException(
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| "<parameter> requires an 'identifier' attribute", |
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| ruleSetReader.getLocator( ) ); |
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| } |
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| identifier = identifier.trim( );
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| try
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| { |
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| return rule.addParameterDeclaration( identifier, null );
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| } |
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| catch ( InvalidRuleException e ) |
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| { |
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| throw new SAXParseException( "'" + identifier + "' is already defined", ruleSetReader.getLocator() );
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| } |
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| } |
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| public Object end( String uri, String localName ) throws SAXException
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| { |
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| Declaration declaration = (Declaration) ruleSetReader.getCurrent( );
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| Rule rule = (Rule) ruleSetReader.getParent( Rule.class );
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| if ( rule == null || declaration == null )
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| { |
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| throw new SAXParseException( "unable to construct <parameter>",
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| ruleSetReader.getLocator( ) ); |
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| } |
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| if ( declaration.getObjectType( ) == null )
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| { |
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| throw new SAXParseException( "<parameter> requires an object-type",
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| ruleSetReader.getLocator( ) ); |
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| } |
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| return null;
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| } |
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| public Class generateNodeFor()
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| { |
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| return Declaration.class;
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| } |
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| } |