content: /**
   * 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 storm.trident.tuple;
  
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Tuple;
  import clojure.lang.IPersistentVector;
  import clojure.lang.PersistentVector;
  import clojure.lang.RT;
  import java.util.AbstractList;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.Arrays;
  
  //extends abstractlist so that it can be emitted directly as Storm tuples
  public class TridentTupleView extends AbstractList<Object> implements TridentTuple {
      ValuePointer[] _index;
      Map<String, ValuePointer> _fieldIndex;
      IPersistentVector _delegates;
  
      public static class ProjectionFactory implements Factory {
          Map<String, ValuePointer> _fieldIndex;
          ValuePointer[] _index;
          Factory _parent;
  
          public ProjectionFactory(Factory parent, Fields projectFields) {
              _parent = parent;
              if(projectFields==null) projectFields = new Fields();
              Map<String, ValuePointer> parentFieldIndex = parent.getFieldIndex();
              _fieldIndex = new HashMap<>();
              for(String f: projectFields) {
                  _fieldIndex.put(f, parentFieldIndex.get(f));
              }            
              _index = ValuePointer.buildIndex(projectFields, _fieldIndex);
          }
          
          public TridentTuple create(TridentTuple parent) {
              if(_index.length==0) return EMPTY_TUPLE;
              else return new TridentTupleView(((TridentTupleView)parent)._delegates, _index, _fieldIndex);
          }
  
          @Override
          public Map<String, ValuePointer> getFieldIndex() {
              return _fieldIndex;
          }
  
          @Override
          public int numDelegates() {
              return _parent.numDelegates();
          }
  
          @Override
          public List<String> getOutputFields() {
              return indexToFieldsList(_index);
          }
      }
      
      public static class FreshOutputFactory  implements Factory {
          Map<String, ValuePointer> _fieldIndex;
          ValuePointer[] _index;
  
          public FreshOutputFactory(Fields selfFields) {
              _fieldIndex = new HashMap<>();
              for(int i=0; i<selfFields.size(); i++) {
                  String field = selfFields.get(i);
                  _fieldIndex.put(field, new ValuePointer(0, i, field));
              }
              _index = ValuePointer.buildIndex(selfFields, _fieldIndex);
          }
          
          public TridentTuple create(List<Object> selfVals) {
              return new TridentTupleView(PersistentVector.EMPTY.cons(selfVals), _index, _fieldIndex);
          }
  
          @Override
          public Map<String, ValuePointer> getFieldIndex() {
              return _fieldIndex;
          }
  
          @Override
          public int numDelegates() {
              return 1;
          }
          
          @Override
          public List<String> getOutputFields() {
              return indexToFieldsList(_index);
          }        
      }
      
      public static class OperationOutputFactory implements Factory {
          Map<String, ValuePointer> _fieldIndex;
          ValuePointer[] _index;
          Factory _parent;
  
          public OperationOutputFactory(Factory parent, Fields selfFields) {
              _parent = parent;
              _fieldIndex = new HashMap<>(parent.getFieldIndex());
              int myIndex = parent.numDelegates();
              for(int i=0; i<selfFields.size(); i++) {
                  String field = selfFields.get(i);
                  _fieldIndex.put(field, new ValuePointer(myIndex, i, field));
              }
              List<String> myOrder = new ArrayList<>(parent.getOutputFields());
              
              Set<String> parentFieldsSet = new HashSet<>(myOrder);
              for(String f: selfFields) {
                  if(parentFieldsSet.contains(f)) {
                      throw new IllegalArgumentException(
                              "Additive operations cannot add fields with same name as already exists. "
                              + "Tried adding " + selfFields + " to " + parent.getOutputFields());
                  }
                  myOrder.add(f);
              }
              
              _index = ValuePointer.buildIndex(new Fields(myOrder), _fieldIndex);
          }
          
          public TridentTuple create(TridentTupleView parent, List<Object> selfVals) {
              IPersistentVector curr = parent._delegates;
              curr = (IPersistentVector) RT.conj(curr, selfVals);
              return new TridentTupleView(curr, _index, _fieldIndex);
          }
  
          @Override
          public Map<String, ValuePointer> getFieldIndex() {
              return _fieldIndex;
          }
  
          @Override
          public int numDelegates() {
              return _parent.numDelegates() + 1;
          }
  
          @Override
          public List<String> getOutputFields() {
              return indexToFieldsList(_index);
          }
      }
      
      public static class RootFactory implements Factory {
          ValuePointer[] index;
          Map<String, ValuePointer> fieldIndex;
          
          public RootFactory(Fields inputFields) {
              index = new ValuePointer[inputFields.size()];
              int i=0;
              for(String f: inputFields) {
                  index[i] = new ValuePointer(0, i, f);
                  i++;
              }
              fieldIndex = ValuePointer.buildFieldIndex(index);
          }
          
          public TridentTuple create(Tuple parent) {            
              return new TridentTupleView(PersistentVector.EMPTY.cons(parent.getValues()), index, fieldIndex);
          }
  
          @Override
          public Map<String, ValuePointer> getFieldIndex() {
              return fieldIndex;
          }
  
          @Override
          public int numDelegates() {
              return 1;
          }
          
          @Override
          public List<String> getOutputFields() {
              return indexToFieldsList(this.index);
          }
      }
      
      private static List<String> indexToFieldsList(ValuePointer[] index) {
          List<String> ret = new ArrayList<>();
          for(ValuePointer p: index) {
              ret.add(p.field);
          }
          return ret;
      }
      
      public static final TridentTupleView EMPTY_TUPLE = new TridentTupleView(null, new ValuePointer[0], new HashMap());
  
      // index and fieldIndex are precomputed, delegates built up over many operations using persistent data structures
      public TridentTupleView(IPersistentVector delegates, ValuePointer[] index, Map<String, ValuePointer> fieldIndex) {
          _delegates = delegates;
          _index = index;
          _fieldIndex = fieldIndex;
      }
  
      public static TridentTuple createFreshTuple(Fields fields, List<Object> values) {
          FreshOutputFactory factory = new FreshOutputFactory(fields);
          return factory.create(values);
      }
  
      public static TridentTuple createFreshTuple(Fields fields, Object... values) {
          FreshOutputFactory factory = new FreshOutputFactory(fields);
          return factory.create(Arrays.asList(values));
      }
  
      @Override
      public List<Object> getValues() {
          return this;
      }    
  
      @Override
      public int size() {
          return _index.length;
      }
  
      @Override
      public boolean contains(String field) {
          return getFields().contains(field);
      }
  
      @Override
      public Fields getFields() {
          return new Fields(indexToFieldsList(_index));
      }
  
      @Override
      public int fieldIndex(String field) {
          return getFields().fieldIndex(field);
      }
  
      @Override
      public List<Object> select(Fields selector) {
          return getFields().select(selector, getValues());
      }
  
      @Override
      public Object get(int i) {
          return getValue(i);
      }    
      
      @Override
      public Object getValue(int i) {
          return getValueByPointer(_index[i]);
      }
  
      @Override
      public String getString(int i) {
          return (String) getValue(i);
      }
  
      @Override
      public Integer getInteger(int i) {
          return (Integer) getValue(i);
      }
  
      @Override
      public Long getLong(int i) {
          return (Long) getValue(i);
      }
  
      @Override
      public Boolean getBoolean(int i) {
          return (Boolean) getValue(i);
      }
  
      @Override
      public Short getShort(int i) {
          return (Short) getValue(i);
      }
  
      @Override
      public Byte getByte(int i) {
          return (Byte) getValue(i);
      }
  
      @Override
      public Double getDouble(int i) {
          return (Double) getValue(i);
      }
  
      @Override
      public Float getFloat(int i) {
          return (Float) getValue(i);
      }
  
      @Override
      public byte[] getBinary(int i) {
          return (byte[]) getValue(i);
      }
  
      @Override
      public Object getValueByField(String field) {
          return getValueByPointer(_fieldIndex.get(field));
      }
  
      @Override
      public String getStringByField(String field) {
          return (String) getValueByField(field);
      }
  
      @Override
      public Integer getIntegerByField(String field) {
          return (Integer) getValueByField(field);
      }
  
      @Override
      public Long getLongByField(String field) {
          return (Long) getValueByField(field);
      }
  
      @Override
      public Boolean getBooleanByField(String field) {
          return (Boolean) getValueByField(field);
      }
  
      @Override
      public Short getShortByField(String field) {
          return (Short) getValueByField(field);
      }
  
      @Override
      public Byte getByteByField(String field) {
          return (Byte) getValueByField(field);
      }
  
      @Override
      public Double getDoubleByField(String field) {
          return (Double) getValueByField(field);
      }
  
      @Override
      public Float getFloatByField(String field) {
          return (Float) getValueByField(field);
      }
  
      @Override
      public byte[] getBinaryByField(String field) {
          return (byte[]) getValueByField(field);
      }
  
      private Object getValueByPointer(ValuePointer ptr) {
          return ((List<Object>)_delegates.nth(ptr.delegateIndex)).get(ptr.index);     
      }
  }
  