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Dataplatform Schema is a generalized nested schema. This Package provides flexible formatter and parser to JSON.

There is a newer version: 1.2.4_hive-1.2.1000.2.6.5.99-1

/**
 * 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 jp.co.yahoo.dataplatform.schema.parser;

import java.io.IOException;

import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;

import com.fasterxml.jackson.databind.node.ObjectNode;

import jp.co.yahoo.dataplatform.schema.objects.PrimitiveObject;
import jp.co.yahoo.dataplatform.schema.objects.JsonNodeToPrimitiveObject;

public class JacksonObjectParser implements IParser {

  private final ObjectNode objectNode;

  public JacksonObjectParser( final ObjectNode objectNode ){
    this.objectNode = objectNode;
  } 
 
  @Override
  public PrimitiveObject get(final String key ) throws IOException{
    return JsonNodeToPrimitiveObject.get( objectNode.path( key ) );
  }

  @Override
  public PrimitiveObject get( final int index ) throws IOException{
    return get( Integer.toString( index ) );
  }

  @Override
  public IParser getParser( final String key ) throws IOException{
    return JsonNodeToParser.get( objectNode.path( key ) );
  }

  @Override
  public IParser getParser( final int index ) throws IOException{
    return getParser( Integer.toString( index ) );
  }

  @Override
  public String[] getAllKey() throws IOException{
    Iterator iterator = objectNode.fieldNames();
    List list = new ArrayList();
    while( iterator.hasNext() ){
      list.add( (String)iterator.next() );
      
    }
    return list.toArray( new String[ list.size() ] );
  }

  @Override
  public boolean containsKey( final String key ) throws IOException{
    return objectNode.get( key ) != null;
  }

  @Override
  public int size() throws IOException{
    return objectNode.size();
  }

  @Override
  public boolean isArray() throws IOException{
    return false;
  }

  @Override
  public boolean isMap() throws IOException{
    return false;
  }

  @Override
  public boolean isStruct() throws IOException{
    return true;
  }

  @Override
  public boolean hasParser( final int index ) throws IOException{
    return hasParser( Integer.toString( index ) );
  }

  @Override
  public boolean hasParser( final String key ) throws IOException{
    return JsonNodeToParser.hasParser( objectNode.path( key ) );
  }

  @Override
  public Object toJavaObject() throws IOException{
    Map result = new HashMap();
    for( String key : getAllKey() ){
      if( hasParser(key) ){
        result.put( key , getParser(key).toJavaObject() );
      }
      else{
        result.put( key , get(key) );
      }
    }

    return result;
  }

}