/*
* 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.eclipse.reteoo;
import org.drools.core.base.ClassFieldReader;
import org.drools.core.rule.constraint.MvelConstraint;
import org.drools.core.spi.AlphaNodeFieldConstraint;
import org.drools.core.spi.Constraint;
import org.drools.core.spi.FieldValue;
import org.drools.core.spi.InternalReadAccessor;
import org.drools.core.reteoo.AlphaNode;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.swt.graphics.Color;
/**
* Wraps {@link org.drools.core.reteoo.AlphaNode} and adds visual extras like color information
*/
public class AlphaNodeVertex extends BaseVertex {
private final AlphaNode node;
private final String NODE_NAME = "AlphaNode";
/**
* Constructor
*
* @param node node to be wrapped
*/
public AlphaNodeVertex(final AlphaNode node) {
super();
this.node = node;
}
/* (non-Javadoc)
* @see org.drools.core.reteoo.BaseNodeVertex#getHtml()
*/
public String getHtml() {
AlphaNodeFieldConstraint constraint = this.node.getConstraint();
if (constraint instanceof MvelConstraint) {
MvelConstraint mvelConstraint = (MvelConstraint) constraint;
return NODE_NAME + "<BR/>expression : " + mvelConstraint.toString();
}
return NODE_NAME + "<BR/>";
}
/* (non-Javadoc)
* @see org.drools.eclipse.editors.rete.model.BaseVertex#toString()
*/
public String toString() {
return this.node.toString();
}
/* (non-Javadoc)
* @see org.drools.core.reteoo.BaseNodeVertex#getFillColor()
*/
public Color getFillColor() {
return ColorConstants.blue;
}
/**
* Constraint has field extractor and this method is returning fieldName
* it.
*
* @return field name
*/
public String getFieldName() {
AlphaNodeFieldConstraint constraint = this.node.getConstraint();
if (constraint instanceof MvelConstraint) {
MvelConstraint mvelConstraint = (MvelConstraint) constraint;
InternalReadAccessor accessor = mvelConstraint.getFieldExtractor();
if (accessor instanceof ClassFieldReader) {
return ((ClassFieldReader) accessor).getFieldName();
}
}
return null;
}
/**
* Constraint's evaluator string
*
* @return evaluator string
*/
public String getEvaluator() {
AlphaNodeFieldConstraint constraint = this.node.getConstraint();
if (constraint instanceof MvelConstraint) {
MvelConstraint mvelConstraint = (MvelConstraint) constraint;
return mvelConstraint.toString();
}
return null;
}
/**
* Constraint field string
*
* @return field string
*/
public String getValue() {
AlphaNodeFieldConstraint constraint = this.node.getConstraint();
if (constraint instanceof MvelConstraint) {
MvelConstraint mvelConstraint = (MvelConstraint) constraint;
FieldValue field = mvelConstraint.getField();
return field != null ? field.toString() : null;
}
return null;
}
/**
* Constraint
*
* @return constraint
*/
public Constraint getConstraint() {
return this.node.getConstraint();
}
}