org.drools.compiler.rule.builder.util.PatternBuilderUtil Maven / Gradle / Ivy

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/*
 * Copyright (c) 2020. 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.compiler.rule.builder.util;

import org.drools.compiler.lang.descr.LiteralRestrictionDescr;
import org.drools.core.base.ValueType;
import org.drools.core.spi.FieldValue;

import static org.drools.core.base.evaluators.PointInTimeEvaluator.getTimestampFromDate;

public class PatternBuilderUtil {

    public static String getNormalizeDate( ValueType vtype, FieldValue field ) {
        Object value = field.getValue();
        if (value == null) {
            return "null";
        }

        long lvalue = getTimestampFromDate( value );
        if (vtype == ValueType.DATE_TYPE) {
            return " new java.util.Date(" + lvalue + ")";
        }
        if (vtype == ValueType.LOCAL_DATE_TYPE) {
            return " java.time.Instant.ofEpochMilli(" + lvalue + ").atZone(java.time.ZoneId.systemDefault()).toLocalDate()";
        }
        if (vtype == ValueType.LOCAL_TIME_TYPE) {
            return " java.time.Instant.ofEpochMilli(" + lvalue + ").atZone(java.time.ZoneId.systemDefault()).toLocalDateTime()";
        }

        throw new IllegalArgumentException( "Unsupported type " + vtype );
    }

    public static String normalizeStringOperator( String leftValue, String rightValue, LiteralRestrictionDescr restrictionDescr ) {
        String method = restrictionDescr.getParameterText();
        if (method.equals("length")) {
            return leftValue + ".length()" + (restrictionDescr.isNegated() ? " != " : " == ") + rightValue;
        }
        return (restrictionDescr.isNegated() ? "!" : "") + leftValue + "." + method + "(" + rightValue + ")";
    }

    public static String normalizeEmptyKeyword( String expr, String operator ) {
        return expr.startsWith("empty") && (operator.equals("==") || operator.equals("!=")) && !Character.isJavaIdentifierPart(expr.charAt(5)) ?
                "isEmpty()" + expr.substring(5) :
                expr;
    }

}