org.drools.compiler.lang.descr.PatternDescr Maven / Gradle / Ivy

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/*
 * 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.compiler.lang.descr;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;

import org.drools.compiler.rule.builder.RuleBuildContext;
import org.drools.core.factmodel.GenericTypeDefinition;
import org.drools.core.rule.Declaration;

import static org.drools.core.factmodel.GenericTypeDefinition.parseType;

public class PatternDescr extends AnnotatedBaseDescr
    implements
    Cloneable {
    private static final long       serialVersionUID     = 510l;
    private String                  objectType;
    private String                  identifier;
    private boolean                 unification;
    private ConditionalElementDescr constraint           = new AndDescr();
    private int                     leftParentCharacter  = -1;
    private int                     rightParentCharacter = -1;
    private PatternSourceDescr      source;
    private List     behaviors;
    private boolean                 query;
    private Declaration             xpathStartDeclaration;
    private GenericTypeDefinition genericType;

    public PatternDescr() {
        this( null,
              null );
    }

    public PatternDescr(final String objectType) {
        this( objectType,
              null );
    }

    public PatternDescr(final String objectType,
                        final String identifier) {
        this.objectType = objectType;
        this.identifier = identifier;
    }

    public PatternDescr(final String objectType,
                        final String identifier,
                        final boolean isQuery ) {
        this.objectType = objectType;
        this.identifier = identifier;
        this.query = isQuery; 
    }

    public void setIdentifier( final String identifier ) {
        this.identifier = identifier;
    }

    public void setObjectType( final String objectType ) {
        this.objectType = objectType;
    }

    public void setQuery( boolean query ) {
        this.query = query;
    }

    public String getObjectType() {
        return this.objectType;
    }

    public boolean resolveObjectType( Function resolver ) {
        if (genericType == null) {
            genericType = parseType(objectType, resolver);
        }
        return genericType != null;
    }

    public GenericTypeDefinition getGenericType() {
        return genericType == null ? new GenericTypeDefinition(objectType) : genericType;
    }

    public String getIdentifier() {
        return this.identifier;
    }
    
    public boolean isQuery() {
        return query;
    }

    public boolean isPassive(RuleBuildContext context) {
        // when the source is a FromDesc also check that it isn't the datasource of a ruleunit
        return query || ( source instanceof FromDescr && !context.getEntryPointId( ( (FromDescr) source ).getDataSource().getText() ).isPresent() );
    }

    public List< ? extends BaseDescr> getDescrs() {
        return this.constraint.getDescrs();
    }

    public void addConstraint( BaseDescr base ) {
        this.constraint.addDescr( base );
    }

    public void removeAllConstraint() {
        constraint= new AndDescr();
    }

    public boolean removeConstraint( BaseDescr base ) {
        return this.constraint.removeDescr(base);
    }

    public ConditionalElementDescr getConstraint() {
        return this.constraint;
    }

    public PatternDescr negateConstraint() {
        this.constraint = (ConditionalElementDescr) ((BaseDescr)this.constraint).negate();
        return this;
    }

    public List< ? extends BaseDescr> getPositionalConstraints() {
        return this.doGetConstraints(ExprConstraintDescr.Type.POSITIONAL);
    }

    public List< ? extends BaseDescr> getSlottedConstraints() {
        return this.doGetConstraints(ExprConstraintDescr.Type.NAMED);
    }

    private List< ? extends BaseDescr> doGetConstraints(ExprConstraintDescr.Type type) {
        List returnList = new ArrayList();
        for(BaseDescr descr : this.constraint.getDescrs()) {

            // if it is a ExprConstraintDescr - check the type
            if(descr instanceof ExprConstraintDescr) {
                ExprConstraintDescr desc = (ExprConstraintDescr) descr;
                if(desc.getType().equals(type)) {
                    returnList.add(desc);
                }
            } else {
                // otherwise, assume 'NAMED'
                if(type.equals(ExprConstraintDescr.Type.NAMED)) {
                    returnList.add(descr);
                }
            }
        }

        return returnList;
    }

    public boolean isInternalFact(RuleBuildContext context) {
        return !(source == null || source instanceof EntryPointDescr ||
                 (source instanceof FromDescr) && context.getEntryPointId(((FromDescr) source).getExpression()).isPresent());
    }

    public String toString() {
        return "[Pattern: id=" + this.identifier + "; objectType=" + this.objectType + "]";
    }

    /**
     * @return the leftParentCharacter
     */
    public int getLeftParentCharacter() {
        return this.leftParentCharacter;
    }

    /**
     * @param leftParentCharacter the leftParentCharacter to set
     */
    public void setLeftParentCharacter( final int leftParentCharacter ) {
        this.leftParentCharacter = leftParentCharacter;
    }

    /**
     * @return the rightParentCharacter
     */
    public int getRightParentCharacter() {
        return this.rightParentCharacter;
    }

    /**
     * @param rightParentCharacter the rightParentCharacter to set
     */
    public void setRightParentCharacter( final int rightParentCharacter ) {
        this.rightParentCharacter = rightParentCharacter;
    }

    public PatternSourceDescr getSource() {
        return source;
    }

    public void setSource( PatternSourceDescr source ) {
        this.source = source;
    }

    @Override
    public void setResource(org.kie.api.io.Resource resource) {
        super.setResource(resource);
        ((BaseDescr) this.constraint).setResource(resource);
    };

    /**
     * @return the behaviors
     */
    public List getBehaviors() {
        if ( behaviors == null ) {
            return Collections.emptyList();
        }
        return behaviors;
    }

    /**
     * @param behaviors the behaviors to set
     */
    public void setBehaviors( List behaviors ) {
        this.behaviors = behaviors;
    }

    public void addBehavior( BehaviorDescr behavior ) {
        if ( this.behaviors == null ) {
            this.behaviors = new ArrayList();
        }
        this.behaviors.add( behavior );
    }

    /**
     * @return the unification
     */
    public boolean isUnification() {
        return unification;
    }

    /**
     * @param unification the unification to set
     */
    public void setUnification( boolean unification ) {
        this.unification = unification;
    }

    public Declaration getXpathStartDeclaration() {
        return xpathStartDeclaration;
    }

    public void setXpathStartDeclaration( Declaration xpathStartDeclaration ) {
        this.xpathStartDeclaration = xpathStartDeclaration;
    }

    public Object clone() {
        PatternDescr clone = new PatternDescr( this.objectType,
                                               this.identifier );
        clone.setQuery( this.query );
        clone.setUnification( unification );
        clone.setLeftParentCharacter( this.leftParentCharacter );
        clone.setRightParentCharacter( this.rightParentCharacter );
        clone.setSource( this.source );
        clone.setStartCharacter( this.getStartCharacter() );
        clone.setEndCharacter( this.getEndCharacter() );
        clone.setLocation( this.getLine(),
                           this.getColumn() );
        clone.setEndLocation( this.getEndLine(),
                              this.getEndColumn() );
        clone.setText( this.getText() );
        for ( BaseDescr constraint : this.getDescrs() ) {
            clone.addConstraint( constraint );
        }
        if ( behaviors != null ) {
            for ( BehaviorDescr behavior : behaviors ) {
                clone.addBehavior( behavior );
            }
        }
        clone.setXpathStartDeclaration( xpathStartDeclaration );
        return clone;
    }

    public void accept(DescrVisitor visitor) {
        visitor.visit(this);
    }
}