Android Open Source - sloop Data Record Impl

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License

The source code is released under:

NON-LICENSE The Sloop data-browser source code is hereby released into the Public Domain. The original author, David Megginson, Megginson Technologies Ltd., and Acclar Open Ltd. provide no warranty:...

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Java Source Code

package com.megginson.sloop.model.impl;
/*from w w w . j  ava  2  s . c  om*/
import java.util.AbstractList;
import java.util.List;

import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;

import com.megginson.sloop.model.DataEntry;
import com.megginson.sloop.model.DataRecord;

/**
 * A read-only data record, consisting of name/value pairs.
 * 
 * Implements the {@link Parcelable} interface so that it can be saved in an
 * Android {@link Bundle}.
 * 
 * @author David Megginson
 * @see DataCollectionImpl
 * @see DataEntryImpl
 */
class DataRecordImpl implements DataRecord {
  
  private String mHeaders[];
  
  private String mValues[];
  
  private boolean mColumnFilterFlags[];
  
  private EntryList mEntryList;

  protected DataRecordImpl(String headers[], String values[], boolean columnFilterFlags[]) {
    mHeaders = headers;
    mValues = values;
    mColumnFilterFlags = columnFilterFlags;
  }
  
  @Override
  public List<DataEntry> getEntries() {
    if (mEntryList == null) {
      mEntryList = new EntryList();
    }
    return mEntryList;
  }

  @Override
  public DataEntry get(String name) {
    return get(name, 0);
  }

  @Override
  public DataEntry get(String name, int index) {
    for (int i = 0; i < mHeaders.length; i++) {
      if (name.equals(mHeaders[i])) {
        if (index == 0) {
          return makeEntry(i);
        } else {
          index--;
        }
      }
    }
    return null;
  }

  @Override
  public int size(String name) {
    int count = 0;
    for (String header : mHeaders) {
      if (name.equals(header)) {
        count++;
      }
    }
    return count;
  }

  @Override
  public int describeContents() {
    return 0;
  }
  
  @Override
  public int hashCode() {
    return getEntries().hashCode();
  }
  
  @Override
  public boolean equals(Object o) {
    if (o != null && o instanceof DataRecord) {
      DataRecord record = (DataRecord)o;
      return (getEntries().equals(record.getEntries()));
    }
    return false;
  }

  /**
   * Serialize the record to an Android parcel.
   */
  @Override
  public void writeToParcel(Parcel dest, int flags) {
    dest.writeStringArray(mHeaders);
    dest.writeStringArray(mValues);
    dest.writeBooleanArray(mColumnFilterFlags);
  }
  
  private DataEntry makeEntry(int index) {
    return new DataEntryImpl(mHeaders[index], mValues[index], mColumnFilterFlags[index]);
  }

  public final static Parcelable.Creator<DataRecordImpl> CREATOR = new Parcelable.Creator<DataRecordImpl>() {

    /**
     * Deserialize a record from an Android parcel.
     */
    @Override
    public DataRecordImpl createFromParcel(Parcel source) {
      String headers[] = source.createStringArray();
      String values[] = source.createStringArray();
      boolean columnFilterFlags[] = source.createBooleanArray();
      return new DataRecordImpl(headers, values, columnFilterFlags);
    }

    @Override
    public DataRecordImpl[] newArray(int size) {
      return new DataRecordImpl[size];
    }
  };
  
  /**
   * List wrapper for the record's entries.
   * 
   * @author David Megginson
   * @see DataRecord#getEntries()
   */
  private class EntryList extends AbstractList<DataEntry> {
    
    @Override
    public DataEntry get(int location) {
      return makeEntry(location);
    }

    @Override
    public int size() {
      return mHeaders.length;
    }

  }

}

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