ExactMatcherSearch.java

/*
 * Copyright 2016 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.workbench.services.verifier.api.client.index.select;

import java.util.List;

import org.drools.workbench.services.verifier.api.client.maps.MultiMap;
import org.drools.workbench.services.verifier.api.client.index.keys.Value;
import org.drools.workbench.services.verifier.api.client.index.matchers.ExactMatcher;

public class ExactMatcherSearch<T> {

    private ExactMatcher                matcher;
    private MultiMap<Value, T, List<T>> map;

    public ExactMatcherSearch( final ExactMatcher matcher,
                               final MultiMap<Value, T, List<T>> map ) {
        this.matcher = matcher;
        this.map = map;
    }

    public MultiMap<Value, T, List<T>> search() {

        if ( matcher.isNegate() ) {

            if ( map.containsKey( matcher.getValue() ) ) {

                return MultiMap.merge( map.subMap( map.firstKey(), true,
                                                   matcher.getValue(), false ),
                                       map.subMap( matcher.getValue(), false,
                                                   map.lastKey(), true ) );

            } else {
                return map;
            }
        } else {
            return map.subMap( matcher.getValue(), true,
                               matcher.getValue(), true );
        }
    }
}