com.bazaarvoice.jolt.removr.spec.RemovrLeafSpec Maven / Gradle / Ivy

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/*
 * Copyright 2013 Bazaarvoice, 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.
 */
package com.bazaarvoice.jolt.removr.spec;

import com.bazaarvoice.jolt.common.pathelement.LiteralPathElement;
import com.bazaarvoice.jolt.common.pathelement.StarAllPathElement;
import com.bazaarvoice.jolt.common.pathelement.StarPathElement;

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 * Spec for handling the leaf level of the Removr Transform.
 */
public class RemovrLeafSpec extends RemovrSpec {

    public RemovrLeafSpec( String rawKey ) {
        super( rawKey );
    }

    /**
     * Build a list of keys to remove from the input map, using the pathElement
     *  from the Spec.
     *
     * @param inputMap : Input map from which the spec key needs to be removed.
     */
    @Override
    public List applyToMap( Map inputMap ) {
        if ( inputMap == null ) {
            return null;
        }

        List keysToBeRemoved = new LinkedList<>();

        if ( pathElement instanceof LiteralPathElement ) {

            // if we are a literal, check to see if we match
            if ( inputMap.containsKey( pathElement.getRawKey() ) ) {
                keysToBeRemoved.add( pathElement.getRawKey() );
            }
        }
        else if ( pathElement instanceof StarPathElement ) {

            StarPathElement star = (StarPathElement) pathElement;

            // if we are a wildcard, check each input key to see if it matches us
            for( String key : inputMap.keySet() ) {

                if ( star.stringMatch( key ) ) {
                    keysToBeRemoved.add( key );
                }
            }
        }

        return keysToBeRemoved;
    }

    /**
     * @param inputList : Input List from which the spec key needs to be removed.
     */
    @Override
    public List applyToList( List