/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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.
 */
package com.orientechnologies.orient.core.tx;

import java.util.ArrayList;
import java.util.List;

import com.orientechnologies.orient.core.db.record.OIdentifiable;
import com.orientechnologies.orient.core.tx.OTransactionIndexChanges.OPERATION;

/**
 * Collects the changes to an index for a certain key
 * 
 * @author Luca Garulli (l.garulli--at--orientechnologies.com)
 * 
 */
public class OTransactionIndexChangesPerKey {
  public Object                       key;
  public List<OTransactionIndexEntry> entries;

  public static class OTransactionIndexEntry {
    public OPERATION     operation;
    public OIdentifiable value;

    public OTransactionIndexEntry(final OIdentifiable iValue, final OPERATION iOperation) {
      value = iValue;
      operation = iOperation;
    }
  }

  public OTransactionIndexChangesPerKey(final Object iKey) {
    this.key = iKey;
    entries = new ArrayList<OTransactionIndexEntry>();
  }

  public void add(OIdentifiable iValue, final OPERATION iOperation) {
    entries.add(new OTransactionIndexEntry(iValue != null ? iValue.getIdentity() : null, iOperation));
  }

  @Override
  public String toString() {
    final StringBuilder builder = new StringBuilder();
    builder.append(key).append(" [");
    boolean first = true;
    for (OTransactionIndexEntry entry : entries) {
      if (first)
        first = false;
      else
        builder.append(',');

      builder.append(entry.value).append(" (").append(entry.operation).append(")");
    }
    builder.append("]");
    return builder.toString();
  }
}
