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package com.cedarsoft.utils.springrcp.selection;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

/**
 * 
 * Date: 22.08.2006

 * Time: 20:35:19

 *
 * @author Johannes Schneider -
 *         Xore Systems
 */
public class DefaultSelection implements Selection {
  private Class type;
  private Collection selectedElements;
  private T selected;

  public DefaultSelection( @NotNull Class type, @NotNull Collection selectedElements ) {
    this.type = type;
    this.selectedElements = new ArrayList( selectedElements );
  }

  public DefaultSelection( @NotNull Class type ) {
    this( type, ( T ) null );
  }

  public DefaultSelection( @NotNull Class type, @Nullable T selected ) {
    this.type = type;
    this.selected = selected;
    this.selectedElements = Collections.emptyList();
  }

  public boolean isEmty() {
    return selectedElements.isEmpty() && selected == null;
  }

  public boolean isSingleSelection() {
    return selected != null;
  }

  public boolean isMultiSelection() {
    return !selectedElements.isEmpty();
  }

  @NotNull
  public T getSingleSelection() {
    return selected;
  }

  @NotNull
  public Collection getMultiSelection() {
    return Collections.unmodifiableCollection( selectedElements );
  }

  @NotNull
  public Class getType() {
    return type;
  }

  @Override
  public String toString() {
    return "DefaultSelection{" +
        "type=" + type +
        ", selectedElements=" + selectedElements +
        ", selected=" + selected +
        '}';
  }
}