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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */

package com.gemstone.gemfire.cache.query.internal;

import java.util.*;
import java.io.*;
import com.gemstone.gemfire.cache.query.*;
import com.gemstone.gemfire.cache.query.types.*;
import com.gemstone.gemfire.cache.query.internal.types.StructTypeImpl;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
import com.gemstone.gemfire.internal.shared.Version;
import com.gemstone.gemfire.DataSerializer;
import com.gemstone.gemfire.internal.DataSerializableFixedID;
import com.gemstone.gemfire.pdx.PdxInstance;
import com.gemstone.gemfire.pdx.internal.PdxString;

/**
 * Implementation of Struct
 * @author Eric Zoerner
 * @since 4.0
 */
public class StructImpl
  implements Struct, DataSerializableFixedID {
  private StructTypeImpl type;
  private Object[] values;
  private transient boolean hasPdx = false;
  /** no-arg constructor required for DataSerializable */
  public StructImpl() {};
  
  /** Creates a new instance of StructImpl */
  public StructImpl(StructTypeImpl type, Object[] values) {
    if (type == null) {
      throw new IllegalArgumentException(LocalizedStrings.StructImpl_TYPE_MUST_NOT_BE_NULL.toLocalizedString());
    }
    this.type = type;
    this.values = values;
    if (this.values != null) {
      for (Object o : values) {
        if (o instanceof PdxInstance || o instanceof PdxString) {
          this.hasPdx = true;
          break;
        } 
      }
    }
  }

  /**
   * @throws IllegalArgumentException if fieldName not found
   */
  public Object get(String fieldName) {
    return this.values[this.type.getFieldIndex(fieldName)];
  }

  public ObjectType[] getFieldTypes() {
    return this.type.getFieldTypes();
  }


  public String[] getFieldNames() {
    return this.type.getFieldNames();
  }

  public Object[] getFieldValues() {
    if (this.values == null) {
      return new Object[0];
    }
    return this.values;
  }  
  
  /**
   * Helper method, Returns field values, in case of PdxInstance 
   * gets the domain objects.
   */
  public Object[] getPdxFieldValues() {
    if (this.values == null) {
      return new Object[0];
    }
    
    Object[] fValues = new Object[this.values.length];
    for (int i=0; i < this.values.length; i++) {
      if (this.values[i] instanceof PdxInstance) {
        fValues[i] = ((PdxInstance)this.values[i]).getObject();
      }
      else if (this.values[i] instanceof PdxString) {
        fValues[i] = ((PdxString)this.values[i]).toString();
      } else {
        fValues[i] = this.values[i];
      }
    }
    return fValues;
  }  

  public StructType getStructType() {
    return this.type;
  }

  public boolean isHasPdx() {
    return hasPdx;
  }
  
  @Override
  public boolean equals(Object obj) {
    if (!(obj instanceof Struct)) return false;
    Struct s = (Struct)obj;
    if (!Arrays.equals(getFieldTypes(), s.getStructType().getFieldTypes())) return false;
    if (!Arrays.equals(getFieldNames(), s.getStructType().getFieldNames())) return false;
    if (!Arrays.equals(getFieldValues(), s.getFieldValues())) return false;
    return true;
  }
  
  @Override
  public int hashCode() {
    int hashCode = this.type.hashCode();
    for(Object o:values) {
      if(o!= null) {
        hashCode ^= o.hashCode();
      }
    }
    return hashCode;
  }
  
  @Override
  public String toString() {
    Object[] locValues = getFieldValues();
    String[] names = getFieldNames();
    StringBuilder buf = new StringBuilder();
    buf.append("struct(");
    for (int i = 0; i < locValues.length; i++) {
      if (i > 0) buf.append(",");
      buf.append(names[i]);
      buf.append(":");
      buf.append(locValues[i]);
    }
    buf.append(")");
    return buf.toString();
  }

  public int getDSFID() {
    return STRUCT_IMPL;
  }

  public void fromData(DataInput in) throws IOException, ClassNotFoundException
  {
    this.type = (StructTypeImpl)DataSerializer.readObject(in);
    this.values = DataSerializer.readObjectArray(in);
    if (this.values != null) {
      for (Object o : values) {
        if (o instanceof PdxInstance) {
          this.hasPdx = true;
          break;
        } 
      }
    }
  }
  
  public void toData(DataOutput out) throws IOException
  {    
    DataSerializer.writeObject(this.type, out);
    DataSerializer.writeObjectArray(this.values, out);
  }

  @Override
  public Version[] getSerializationVersions() {
    return null;
  }  
}