/*
* Copyright 2011 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.drools.core.base.evaluators;
import org.drools.core.base.BaseEvaluator;
import org.drools.core.base.ValueType;
import org.drools.core.common.InternalFactHandle;
import org.drools.core.common.InternalWorkingMemory;
import org.drools.core.factmodel.traits.CoreWrapper;
import org.drools.core.factmodel.traits.Thing;
import org.drools.core.factmodel.traits.TraitProxy;
import org.drools.core.factmodel.traits.TraitType;
import org.drools.core.factmodel.traits.TraitableBean;
import org.drools.core.rule.VariableRestriction;
import org.drools.core.rule.VariableRestriction.VariableContextEntry;
import org.drools.core.spi.Evaluator;
import org.drools.core.spi.FieldValue;
import org.drools.core.spi.InternalReadAccessor;
import org.drools.core.util.CodedHierarchy;
import org.drools.core.util.HierarchyEncoderImpl;
import org.kie.api.runtime.ObjectFilter;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.BitSet;
import java.util.Collection;
import java.util.Iterator;
/**
* <p>The implementation of the 'str' evaluator definition.</p>
*
* <p>The <b><code>str</code></b> compares two string values.</p>
*
* <p>Lets look at some examples:</p>
*
* <pre>$m : Message( routingValue str[startsWith] "R1" )</pre>
* <pre>$m : Message( routingValue str[endsWith] "R2" )</pre>
* <pre>$m : Message( routingValue str[length] 17 )</pre>
*/
public class IsAEvaluatorDefinition implements EvaluatorDefinition {
protected static final String isAOp = "isA";
public static Operator ISA;
public static Operator NOT_ISA;
private static String[] SUPPORTED_IDS;
static {
if ( Operator.determineOperator( isAOp, false ) == null ) {
ISA = Operator.addOperatorToRegistry( isAOp, false );
NOT_ISA = Operator.addOperatorToRegistry( isAOp, true );
SUPPORTED_IDS = new String[] { isAOp };
}
}
private Evaluator[] evaluator;
/**
* @inheridDoc
*/
public Evaluator getEvaluator(ValueType type, Operator operator) {
return this.getEvaluator(type, operator.getOperatorString(), operator
.isNegated(), null);
}
/**
* @inheridDoc
*/
public Evaluator getEvaluator(ValueType type, Operator operator,
String parameterText) {
return this.getEvaluator(type, operator.getOperatorString(), operator
.isNegated(), parameterText);
}
/**
* @inheridDoc
*/
public Evaluator getEvaluator(ValueType type, String operatorId,
boolean isNegated, String parameterText) {
return getEvaluator(type, operatorId, isNegated, parameterText,
Target.FACT, Target.FACT);
}
/**
* @inheridDoc
*/
public Evaluator getEvaluator(ValueType type, String operatorId,
boolean isNegated, String parameterText, Target leftTarget,
Target rightTarget) {
IsAEvaluator evaluator = new IsAEvaluator(type, isNegated);
evaluator.setParameterText(parameterText);
return evaluator;
}
/**
* @inheridDoc
*/
public String[] getEvaluatorIds() {
return SUPPORTED_IDS;
}
/**
* @inheridDoc
*/
public Target getTarget() {
return Target.FACT;
}
/**
* @inheridDoc
*/
public boolean isNegatable() {
return true;
}
/**
* @inheridDoc
*/
public boolean supportsType(ValueType type) {
return (type.equals( ValueType.TRAIT_TYPE ) );
}
/**
* @inheridDoc
*/
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
evaluator = (Evaluator[]) in.readObject();
}
/**
* @inheridDoc
*/
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(evaluator);
}
public static class IsAEvaluator extends BaseEvaluator {
private BitSet cachedLiteral;
private Object cachedValue;
public IsAEvaluator() { }
public void setParameterText(String parameterText) {
}
public IsAEvaluator(final ValueType type, final boolean isNegated) {
super( type, isNegated ? NOT_ISA : ISA );
}
/**
* @inheridDoc
*/
public boolean evaluate( InternalWorkingMemory workingMemory,
InternalReadAccessor extractor, InternalFactHandle handle, FieldValue value ) {
final Object objectValue = extractor.getValue( workingMemory, handle.getObject() );
final Object literal = value.getValue();
if ( cachedValue != literal) {
cachedValue = literal;
cacheLiteral( literal, workingMemory );
}
TraitableBean core;
if ( objectValue == null ) {
return this.getOperator().isNegated();
} if ( objectValue instanceof Thing ) {
Thing thing = (Thing) objectValue;
core = (TraitableBean) thing.getCore();
BitSet code = core.getCurrentTypeCode();
if ( code != null ) {
return this.getOperator().isNegated() ^ isA( code, cachedLiteral );
} else {
boolean hasTrait = this.getOperator().isNegated() ^ hasTrait( core, literal );
return hasTrait || literal instanceof Class<?> && this.getOperator().isNegated() ^ ( (Class<?>) literal ).isInstance( objectValue );
}
} else if ( objectValue instanceof TraitableBean ) {
core = (TraitableBean) objectValue;
BitSet code = core.getCurrentTypeCode();
if ( code != null ) {
return this.getOperator().isNegated() ^ isA( code, cachedLiteral );
} else {
return this.getOperator().isNegated() ^ hasTrait( core, literal );
}
} else {
core = lookForWrapper( objectValue, workingMemory );
if ( core == null ) {
if ( literal instanceof Class<?> ) {
return this.getOperator().isNegated() ^ ( (Class<?>) literal ).isInstance( objectValue );
} else {
return this.getOperator().isNegated();
}
}
BitSet code = core.getCurrentTypeCode();
if ( code != null ) {
return this.getOperator().isNegated() ^ isA( code, cachedLiteral );
} else {
return this.getOperator().isNegated() ^ hasTrait( core, literal );
}
}
}
private boolean hasTrait( TraitableBean core, Object value ) {
if ( value instanceof Class ) {
return core.hasTrait( ( (Class) value ).getName() );
} else if ( value instanceof String ) {
return core.hasTrait( (String) value );
} else if ( value instanceof Collection ) {
for ( Object o : (Collection) value ) {
if ( ! hasTrait( core, o ) ) {
return false;
}
}
return true;
}
throw new UnsupportedOperationException( " IsA Operator : Unsupported literal " + value );
}
private void cacheLiteral( Object value, InternalWorkingMemory workingMemory ) {
CodedHierarchy x = workingMemory.getKnowledgeBase().getConfiguration().getComponentFactory().getTraitRegistry().getHierarchy();
cachedLiteral = getCode( value, x );
}
private BitSet getCode( Object value, CodedHierarchy x ) {
if ( value instanceof Class ) {
String typeName = ((Class) value).getName();
return x.getCode( typeName );
} else if ( value instanceof String ) {
return x.getCode( value );
} else if ( value instanceof Collection ) {
BitSet code = null;
for ( Object o : ( (Collection) value ) ) {
if ( code == null ) {
code = (BitSet) getCode( o, x ).clone();
} else {
code.and( getCode( o, x ) );
}
}
return code;
}
throw new UnsupportedOperationException( " IsA Operator : Unsupported literal " + value );
}
protected TraitableBean lookForWrapper( final Object objectValue, InternalWorkingMemory workingMemory) {
Iterator iter = workingMemory.getObjectStore().iterateObjects( new ObjectFilter() {
public boolean accept(Object object) {
if ( object instanceof TraitProxy ) {
Object core = ((TraitProxy) object).getObject();
if ( core instanceof CoreWrapper ) {
core = ((CoreWrapper) core).getCore();
}
return core == objectValue;
} else {
return false;
}
}
});
if ( iter.hasNext() ) {
return ((TraitProxy) iter.next()).getObject();
} else {
return null;
// throw new RuntimeException(" Error : the isA operator must be used on a trait-type, was applied to " + objectValue );
}
}
public boolean evaluate(InternalWorkingMemory workingMemory,
InternalReadAccessor leftExtractor, InternalFactHandle left,
InternalReadAccessor rightExtractor, InternalFactHandle right) {
Object target = leftExtractor.getValue( workingMemory, left != null ? left.getObject() : null );
Object source = rightExtractor.getValue( workingMemory, right != null ? right.getObject() : null );
return compare( source, target, workingMemory );
}
public boolean evaluateCachedLeft( InternalWorkingMemory workingMemory,
VariableContextEntry context, InternalFactHandle right ) {
Object target = ((VariableRestriction.ObjectVariableContextEntry) context).left;
Object source = context.getFieldExtractor().getValue( workingMemory, right.getObject() );
return compare( source, target, workingMemory );
}
public boolean evaluateCachedRight( InternalWorkingMemory workingMemory,
VariableContextEntry context, InternalFactHandle left ) {
Object target = context.getFieldExtractor().getValue( workingMemory, left.getObject() );
Object source = ((VariableRestriction.ObjectVariableContextEntry) context).right;
return compare( source, target, workingMemory );
}
private boolean compare( Object source, Object target, InternalWorkingMemory workingMemory ) {
BitSet sourceTraits = null;
BitSet targetTraits = null;
if ( source instanceof Thing ) {
sourceTraits = ((TraitableBean) ((Thing) source).getCore()).getCurrentTypeCode();
if ( sourceTraits == null && source instanceof TraitType ) {
CodedHierarchy x = workingMemory.getKnowledgeBase().getConfiguration().getComponentFactory().getTraitRegistry().getHierarchy();
sourceTraits = x.getCode( ((TraitType)source)._getTraitName() );
}
} else if ( source instanceof TraitableBean ) {
sourceTraits = ((TraitableBean) source).getCurrentTypeCode();
} else if ( source instanceof String ) {
CodedHierarchy x = workingMemory.getKnowledgeBase().getConfiguration().getComponentFactory().getTraitRegistry().getHierarchy();
sourceTraits = x.getCode( source );
} else {
TraitableBean tbean = lookForWrapper( source, workingMemory);
if ( tbean != null ) {
sourceTraits = tbean.getCurrentTypeCode();
}
}
if ( target instanceof Class ) {
CodedHierarchy x = workingMemory.getKnowledgeBase().getConfiguration().getComponentFactory().getTraitRegistry().getHierarchy();
targetTraits = x.getCode( ((Class) target).getName() );
} else if ( target instanceof String ) {
CodedHierarchy x = workingMemory.getKnowledgeBase().getConfiguration().getComponentFactory().getTraitRegistry().getHierarchy();
targetTraits = x.getCode( target );
} else if ( target instanceof Thing ) {
targetTraits = ((TraitableBean) ((Thing) target).getCore()).getCurrentTypeCode();
if ( targetTraits == null && target instanceof TraitType ) {
CodedHierarchy x = workingMemory.getKnowledgeBase().getConfiguration().getComponentFactory().getTraitRegistry().getHierarchy();
targetTraits = x.getCode( ((TraitType)target)._getTraitName() );
}
} else if ( target instanceof TraitableBean ) {
targetTraits = ((TraitableBean) target).getCurrentTypeCode();
} else {
TraitableBean tbean = lookForWrapper( target, workingMemory );
if ( tbean != null ) {
targetTraits = tbean.getCurrentTypeCode();
}
}
if (sourceTraits == null || targetTraits == null) {
return getOperator().isNegated();
}
return isA(sourceTraits, targetTraits) ^ getOperator().isNegated();
}
private boolean isA( BitSet sourceTraits, BitSet targetTraits ) {
if ( sourceTraits == null ) {
return false;
}
return targetTraits == null || HierarchyEncoderImpl.supersetOrEqualset( sourceTraits, targetTraits );
}
@Override
public String toString() {
return "IsAEvaluatorDefinition isA";
}
}
}