characterfactory.java

jboss规则引擎

package org.drools.base.evaluators;

/*
 * Copyright 2005 JBoss Inc
 * 
 * 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.
 */

import org.drools.base.BaseEvaluator;
import org.drools.spi.Evaluator;

public class CharacterFactory {

    public static Evaluator getCharacterEvaluator(final int operator) {
        switch ( operator ) {
            case Evaluator.EQUAL :
                return CharacterEqualEvaluator.INSTANCE;
            case Evaluator.NOT_EQUAL :
                return CharacterNotEqualEvaluator.INSTANCE;
            case Evaluator.LESS :
                return CharacterLessEvaluator.INSTANCE;
            case Evaluator.LESS_OR_EQUAL :
                return CharacterLessOrEqualEvaluator.INSTANCE;
            case Evaluator.GREATER :
                return CharacterGreaterEvaluator.INSTANCE;
            case Evaluator.GREATER_OR_EQUAL :
                return CharacterGreaterOrEqualEvaluator.INSTANCE;
            default :
                throw new RuntimeException( "Operator '" + operator + "' does not exist for CharacterEvaluator" );
        }
    }

    static class CharacterEqualEvaluator extends BaseEvaluator {
        /**
         * 
         */
        private static final long     serialVersionUID = 8766645269581805269L;
        public final static Evaluator INSTANCE         = new CharacterEqualEvaluator();

        private CharacterEqualEvaluator() {
            super( Evaluator.CHAR_TYPE,
                   Evaluator.EQUAL );
        }

        public boolean evaluate(final Object object1,
                                final Object object2) {
            if ( object1 == null ) {
                return object2 == null;
            }
            return ((Character) object1).equals( object2 );
        }

        public String toString() {
            return "Character ==";
        }
    }

    static class CharacterNotEqualEvaluator extends BaseEvaluator {
        /**
         * 
         */
        private static final long     serialVersionUID = 8010152240062213440L;
        public final static Evaluator INSTANCE         = new CharacterNotEqualEvaluator();

        private CharacterNotEqualEvaluator() {
            super( Evaluator.CHAR_TYPE,
                   Evaluator.NOT_EQUAL );
        }

        public boolean evaluate(final Object object1,
                                final Object object2) {
            if ( object1 == null ) {
                return object2 != null;
            }
            return !((Character) object1).equals( object2 );
        }

        public String toString() {
            return "Character !=";
        }
    }

    static class CharacterLessEvaluator extends BaseEvaluator {
        /**
         * 
         */
        private static final long     serialVersionUID = 5236106171143422684L;
        public final static Evaluator INSTANCE         = new CharacterLessEvaluator();

        private CharacterLessEvaluator() {
            super( Evaluator.CHAR_TYPE,
                   Evaluator.LESS );
        }

        public boolean evaluate(final Object object1,
                                final Object object2) {
            return ((Character) object1).charValue() < ((Character) object2).charValue();
        }

        public String toString() {
            return "Character <";
        }
    }

    static class CharacterLessOrEqualEvaluator extends BaseEvaluator {
        /**
         * 
         */
        private static final long     serialVersionUID = 8064001658173531244L;
        public final static Evaluator INSTANCE         = new CharacterLessOrEqualEvaluator();

        private CharacterLessOrEqualEvaluator() {
            super( Evaluator.CHAR_TYPE,
                   Evaluator.LESS_OR_EQUAL );
        }

        public boolean evaluate(final Object object1,
                                final Object object2) {
            return ((Character) object1).charValue() <= ((Character) object2).charValue();
        }

        public String toString() {
            return "Character <=";
        }
    }

    static class CharacterGreaterEvaluator extends BaseEvaluator {
        /**
         * 
         */
        private static final long     serialVersionUID = 7622623046585316842L;
        public final static Evaluator INSTANCE         = new CharacterGreaterEvaluator();

        private CharacterGreaterEvaluator() {
            super( Evaluator.CHAR_TYPE,
                   Evaluator.GREATER );
        }

        public boolean evaluate(final Object object1,
                                final Object object2) {
            return ((Character) object1).charValue() > ((Character) object2).charValue();
        }

        public String toString() {
            return "Character >";
        }
    }

    static class CharacterGreaterOrEqualEvaluator extends BaseEvaluator {
        /**
         * 
         */
        private static final long      serialVersionUID = 8587935558617586015L;
        private final static Evaluator INSTANCE         = new CharacterGreaterOrEqualEvaluator();

        private CharacterGreaterOrEqualEvaluator() {
            super( Evaluator.CHAR_TYPE,
                   Evaluator.GREATER_OR_EQUAL );
        }

        public boolean evaluate(final Object object1,
                                final Object object2) {
            return ((Character) object1).charValue() >= ((Character) object2).charValue();
        }

        public String toString() {
            return "Character >=";
        }
    }

}