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From: robdouglas <git@git.apache.org>
To: dev@streams.incubator.apache.org
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References: <git-pr-150-incubator-streams@git.apache.org>
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Subject: [GitHub] incubator-streams pull request: Streams 218 - General
 Purpose Acti...
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Message-Id: <20141205225509.4909C9533D0@tyr.zones.apache.org>
Date: Fri,  5 Dec 2014 22:55:09 +0000 (UTC)

Github user robdouglas commented on a diff in the pull request:

    https://github.com/apache/incubator-streams/pull/150#discussion_r21406629
  
    --- Diff: streams-components/streams-converters/src/test/java/org/apache/streams/converter/test/CustomDocumentClassifier.java ---
    @@ -0,0 +1,74 @@
    +/*
    +Licensed to the Apache Software Foundation (ASF) under one
    +or more contributor license agreements.  See the NOTICE file
    +distributed with this work for additional information
    +regarding copyright ownership.  The ASF licenses this file
    +to you 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.apache.streams.converter.test;
    +
    +import com.fasterxml.jackson.databind.ObjectMapper;
    +import com.fasterxml.jackson.databind.node.ObjectNode;
    +import com.google.common.base.Preconditions;
    +import com.google.common.collect.Lists;
    +import org.apache.streams.converter.ActivityConverterProcessorConfiguration;
    +import org.apache.streams.data.DocumentClassifier;
    +import org.apache.streams.data.util.ActivityUtil;
    +import org.apache.streams.jackson.StreamsJacksonMapper;
    +import org.apache.streams.pojo.json.Activity;
    +
    +import java.io.IOException;
    +import java.util.List;
    +
    +/**
    + * Support class for
    + * @see {@link org.apache.streams.converter.test.CustomActivityConverterProcessorTest}
    + */
    +public class CustomDocumentClassifier implements DocumentClassifier {
    +
    +    private ObjectMapper mapper = StreamsJacksonMapper.getInstance();
    +
    +    @Override
    +    public List<Class> detectClasses(Object document) {
    +
    +        CustomType possibleMatchDocument = null;
    +        ObjectNode node = null;
    +
    +        List<Class> classes = Lists.newArrayList();
    +
    +        if( document instanceof String ) {
    +            classes.add(String.class);
    +            try {
    +                possibleMatchDocument = this.mapper.readValue((String)document, CustomType.class);
    +                if(possibleMatchDocument != null && possibleMatchDocument.getTest() != null)
    +                    classes.add(CustomType.class);
    +            } catch (IOException e1) {
    +                try {
    +                    node = this.mapper.readValue((String)document, ObjectNode.class);
    +                    classes.add(ObjectNode.class);
    +                } catch (IOException e2) { }
    +            }
    +        } else if( document instanceof ObjectNode ){
    +            classes.add(ObjectNode.class);
    +            possibleMatchDocument = this.mapper.convertValue((ObjectNode)document, CustomType.class);
    --- End diff --
    
    Is this cast necessary if we've already determined that the document is of type ObjectNode?


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