ChainedTranslator.java :  » Google-tech » twig-persist » com » vercer » engine » persist » translator » Java Open Source

package com.vercer.engine.persist.translator;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import com.vercer.engine.persist.Path;
import com.vercer.engine.persist.Property;
import com.vercer.engine.persist.PropertyTranslator;

public class ChainedTranslator implements PropertyTranslator
{
  private final List<PropertyTranslator> translators;

  public ChainedTranslator(PropertyTranslator... translators)
  {
    this.translators = new ArrayList<PropertyTranslator>(Arrays.asList(translators));
  }

  public ChainedTranslator()
  {
    this.translators = new ArrayList<PropertyTranslator>(4);
  }

  public PropertyTranslator append(PropertyTranslator translator)
  {
    this.translators.add(translator);
    return this;
  }

  public PropertyTranslator prepend(PropertyTranslator translator)
  {
    this.translators.add(0, translator);
    return this;
  }

  public Iterator<PropertyTranslator> translators()
  {
    return translators.iterator();
  }

  public Set<Property> typesafeToProperties(Object object, Path prefix, boolean indexed)
  {
    for (PropertyTranslator translator : translators)
    {
      Set<Property> result = translator.typesafeToProperties(object, prefix, indexed);
      if (result != null)
      {
        return result;
      }
    }
    return null;
  }

  public Object propertiesToTypesafe(Set<Property> properties, Path prefix, Type type)
  {
    for (PropertyTranslator translator: translators)
    {
      Object result = translator.propertiesToTypesafe(properties, prefix, type);
      if (result != null)
      {
        return result;
      }
    }
    return null;
  }
}