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org.drools.core.rule.EvalCondition Maven / Gradle / Ivy
/*
* Copyright 2005 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.rule;
import org.drools.core.WorkingMemory;
import org.drools.core.base.mvel.MVELEvalExpression;
import org.drools.core.spi.CompiledInvoker;
import org.drools.core.spi.EvalExpression;
import org.drools.core.spi.Tuple;
import org.drools.core.spi.Wireable;
import org.kie.internal.security.KiePolicyHelper;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class EvalCondition extends ConditionalElement
implements
Externalizable,
Wireable {
private static final long serialVersionUID = 510l;
private EvalExpression expression;
private Declaration[] requiredDeclarations;
private static final Declaration[] EMPTY_DECLARATIONS = new Declaration[0];
private List cloned = Collections. emptyList();
public EvalCondition() {
this( null );
}
public EvalCondition(final Declaration[] requiredDeclarations) {
this( null,
requiredDeclarations );
}
public EvalCondition(final EvalExpression eval,
final Declaration[] requiredDeclarations) {
this.expression = eval;
if ( requiredDeclarations == null ) {
this.requiredDeclarations = EvalCondition.EMPTY_DECLARATIONS;
} else {
this.requiredDeclarations = requiredDeclarations;
}
}
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
expression = (EvalExpression) in.readObject();
requiredDeclarations = (Declaration[]) in.readObject();
this.cloned = (List) in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
if ( this.expression instanceof CompiledInvoker ) {
out.writeObject( null );
} else {
out.writeObject( this.expression );
}
out.writeObject( requiredDeclarations );
out.writeObject( this.cloned );
}
public EvalExpression getEvalExpression() {
return this.expression;
}
public void wire(Object object) {
EvalExpression expression = KiePolicyHelper.isPolicyEnabled() ? new SafeEvalExpression((EvalExpression) object) : (EvalExpression) object;
setEvalExpression( expression );
for ( EvalCondition clone : this.cloned ) {
clone.wireClone( expression );
}
}
private void wireClone(EvalExpression expression) {
setEvalExpression( this.expression instanceof MVELEvalExpression && expression instanceof MVELEvalExpression ?
( (MVELEvalExpression) expression ).clonePreservingDeclarations( (MVELEvalExpression) this.expression ) :
expression );
for ( EvalCondition clone : this.cloned ) {
clone.wireClone( expression );
}
}
public void setEvalExpression(final EvalExpression expression) {
this.expression = expression;
}
public Declaration[] getRequiredDeclarations() {
return this.requiredDeclarations;
}
public Object createContext() {
return this.expression.createContext();
}
public boolean isAllowed(final Tuple tuple,
final WorkingMemory workingMemory,
final Object context) {
try {
return this.expression.evaluate( tuple,
this.requiredDeclarations,
workingMemory,
context );
} catch ( final Exception e ) {
throw new RuntimeException( this.getEvalExpression() + " : " + e,
e );
}
}
public EvalCondition clone() {
final EvalCondition clone = new EvalCondition( this.expression.clone(),
(Declaration[]) this.requiredDeclarations.clone() );
if ( this.cloned == Collections.EMPTY_LIST ) {
this.cloned = new ArrayList( 1 );
}
this.cloned.add( clone );
return clone;
}
public int hashCode() {
return this.expression.hashCode();
}
public boolean equals(final Object object) {
if ( object == this ) {
return true;
}
if ( object == null || object.getClass() != EvalCondition.class ) {
return false;
}
final EvalCondition other = (EvalCondition) object;
if ( this.requiredDeclarations.length != other.requiredDeclarations.length ) {
return false;
}
for ( int i = 0, length = this.requiredDeclarations.length; i < length; i++ ) {
if ( this.requiredDeclarations[i].getPattern().getOffset() != other.requiredDeclarations[i].getPattern().getOffset() ) {
return false;
}
if ( !this.requiredDeclarations[i].getExtractor().equals( other.requiredDeclarations[i].getExtractor() ) ) {
return false;
}
}
return this.expression.equals( other.expression );
}
public Map getInnerDeclarations() {
return Collections.EMPTY_MAP;
}
public Map getOuterDeclarations() {
return Collections.EMPTY_MAP;
}
public List getNestedElements() {
return Collections.EMPTY_LIST;
}
public boolean isPatternScopeDelimiter() {
return true;
}
/**
* @inheritDoc
*/
public Declaration resolveDeclaration(final String identifier) {
return null;
}
public void replaceDeclaration(Declaration declaration,
Declaration resolved) {
for ( int i = 0; i < this.requiredDeclarations.length; i++ ) {
if ( this.requiredDeclarations[i].equals( declaration ) ) {
this.requiredDeclarations[i] = resolved;
}
}
this.expression.replaceDeclaration( declaration,
resolved );
}
@Override
public String toString() {
return this.expression.toString();
}
public static class SafeEvalExpression implements EvalExpression, Serializable {
private static final long serialVersionUID = -5682290553015978731L;
private EvalExpression delegate;
public SafeEvalExpression(EvalExpression delegate) {
this.delegate = delegate;
}
@Override
public Object createContext() {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Object run() {
return delegate.createContext();
}
}, KiePolicyHelper.getAccessContext());
}
@Override
public boolean evaluate(final Tuple tuple,
final Declaration[] requiredDeclarations,
final WorkingMemory workingMemory,
final Object context) throws Exception {
return AccessController.doPrivileged(new PrivilegedExceptionAction() {
@Override
public Boolean run() throws Exception {
return delegate.evaluate(tuple, requiredDeclarations, workingMemory, context);
}
}, KiePolicyHelper.getAccessContext());
}
@Override
public void replaceDeclaration(Declaration declaration, Declaration resolved) {
delegate.replaceDeclaration(declaration, resolved);
}
@Override
public SafeEvalExpression clone() {
return new SafeEvalExpression( this.delegate.clone() );
}
}
}
