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org.drools.core.base.evaluators.PointInTimeEvaluator Maven / Gradle / Ivy
/*
* Copyright 2015 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.
*
* 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.rule.VariableRestriction;
import org.drools.core.spi.FieldValue;
import org.drools.core.spi.InternalReadAccessor;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Date;
public abstract class PointInTimeEvaluator extends BaseEvaluator {
protected long initRange;
protected long finalRange;
protected String paramText;
protected boolean unwrapLeft;
protected boolean unwrapRight;
public PointInTimeEvaluator() {
}
public PointInTimeEvaluator(final ValueType type,
final Operator operator,
final long[] parameters,
final String paramText,
final boolean unwrapLeft,
final boolean unwrapRight) {
super( type, operator );
this.paramText = paramText;
this.unwrapLeft = unwrapLeft;
this.unwrapRight = unwrapRight;
this.setParameters( parameters );
}
@Override
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
super.readExternal( in );
initRange = in.readLong();
finalRange = in.readLong();
paramText = (String) in.readObject();
unwrapLeft = in.readBoolean();
unwrapRight = in.readBoolean();
}
@Override
public void writeExternal(ObjectOutput out) throws IOException {
super.writeExternal( out );
out.writeLong( initRange );
out.writeLong( finalRange );
out.writeObject( paramText );
out.writeBoolean( unwrapLeft );
out.writeBoolean( unwrapRight );
}
@Override
public boolean isTemporal() {
return true;
}
protected abstract boolean evaluate(long rightTS, long leftTS);
protected abstract long getLeftTimestamp( InternalFactHandle handle );
protected abstract long getRightTimestamp( InternalFactHandle handle );
private long getTimestamp(FieldValue value) {
Object obj = value.getValue();
if (obj instanceof Long) {
return (Long)obj;
}
if (obj instanceof Date ) {
return ( (Date) obj ).getTime();
}
throw new RuntimeException("Cannot extract timestamp from " + obj);
}
@Override
public boolean evaluate(InternalWorkingMemory workingMemory,
final InternalReadAccessor extractor,
final InternalFactHandle object1,
final FieldValue object2) {
long rightTS = extractor.isSelfReference() ?
getRightTimestamp( object1 ) :
extractor.getLongValue( workingMemory, object1.getObject() );
long leftTS = getTimestamp(object2);
return evaluate(rightTS, leftTS);
}
@Override
public boolean evaluateCachedLeft(InternalWorkingMemory workingMemory,
final VariableRestriction.VariableContextEntry context,
final InternalFactHandle right) {
if ( context.leftNull ||
context.extractor.isNullValue( workingMemory, right.getObject() ) ) {
return false;
}
long leftTS = ((VariableRestriction.TimestampedContextEntry)context).timestamp;
long rightTS = context.getFieldExtractor().isSelfReference() ?
getRightTimestamp(right) :
context.getFieldExtractor().getLongValue( workingMemory, right.getObject() );
return evaluate(rightTS, leftTS);
}
@Override
public boolean evaluateCachedRight(InternalWorkingMemory workingMemory,
final VariableRestriction.VariableContextEntry context,
final InternalFactHandle left) {
if ( context.rightNull ||
context.declaration.getExtractor().isNullValue( workingMemory, left.getObject() )) {
return false;
}
long rightTS = ((VariableRestriction.TimestampedContextEntry)context).timestamp;
long leftTS = context.declaration.getExtractor().isSelfReference() ?
getLeftTimestamp( left ) :
context.declaration.getExtractor().getLongValue( workingMemory, left.getObject() );
return evaluate(rightTS, leftTS);
}
@Override
public boolean evaluate(InternalWorkingMemory workingMemory,
final InternalReadAccessor extractor1,
final InternalFactHandle handle1,
final InternalReadAccessor extractor2,
final InternalFactHandle handle2) {
if ( extractor1.isNullValue( workingMemory, handle1.getObject() ) ||
extractor2.isNullValue( workingMemory, handle2.getObject() ) ) {
return false;
}
long rightTS = extractor1.isSelfReference() ?
getRightTimestamp( handle1 ) :
extractor1.getLongValue( workingMemory, handle1.getObject() );
long leftTS = extractor2.isSelfReference() ?
getLeftTimestamp( handle2 ) :
extractor2.getLongValue( workingMemory, handle2.getObject() );
return evaluate(rightTS, leftTS);
}
private void setParameters(long[] parameters) {
if ( parameters == null || parameters.length == 0 ) {
// open bounded range
this.initRange = 1;
this.finalRange = Long.MAX_VALUE;
} else if ( parameters.length == 1 ) {
this.initRange = parameters[0];
this.finalRange = Long.MAX_VALUE;
} else if ( parameters.length == 2 ) {
if ( parameters[0] <= parameters[1] ) {
this.initRange = parameters[0];
this.finalRange = parameters[1];
} else {
this.initRange = parameters[1];
this.finalRange = parameters[0];
}
} else {
throw new RuntimeException( "[PointInTimeEvaluator Evaluator]: Not possible to have more than 2 parameters: '" + paramText + "'" );
}
}
@Override
public int hashCode() {
final int PRIME = 31;
int result = super.hashCode();
result = PRIME * result + (int) (finalRange ^ (finalRange >>> 32));
result = PRIME * result + (int) (initRange ^ (initRange >>> 32));
result = PRIME * result + ((paramText == null) ? 0 : paramText.hashCode());
result = PRIME * result + (unwrapLeft ? 1231 : 1237);
result = PRIME * result + (unwrapRight ? 1231 : 1237);
return result;
}
@Override
public boolean equals(Object obj) {
if ( this == obj ) return true;
if ( !super.equals( obj ) ) return false;
if ( getClass() != obj.getClass() ) return false;
PointInTimeEvaluator other = (PointInTimeEvaluator) obj;
if ( finalRange != other.finalRange ) return false;
if ( initRange != other.initRange ) return false;
if ( paramText == null ) {
if ( other.paramText != null ) return false;
} else if ( !paramText.equals( other.paramText ) ) return false;
return unwrapLeft == other.unwrapLeft && unwrapRight == other.unwrapRight;
}
@Override
public String toString() {
return this.getOperator().toString() + "[" + paramText + "]";
}
}
