ElementList.java

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package org.dartlang.vm.service.element;
 
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
 
import java.util.Iterator;
 
/**
 * Simple wrapper around a {@link JsonArray} which lazily converts {@link JsonObject} elements to
 * subclasses of {@link Element}. Subclasses need only implement {@link #basicGet(JsonArray, int)}
 * to return an {@link Element} subclass for the {@link JsonObject} at a given index.
 */
public abstract class ElementList<T> implements Iterable<T> {
 
  private final JsonArray array;
 
  public ElementList(JsonArray array) {
    this.array = array;
  }
 
  public T get(int index) {
    return basicGet(array, index);
  }
 
  public boolean isEmpty() {
    return size() == 0;
  }
 
  @Override
  public Iterator<T> iterator() {
    return new Iterator<T>() {
      int index = 0;
 
      @Override
      public boolean hasNext() {
        return index < size();
      }
 
      @Override
      public T next() {
        return get(index++);
      }
 
      @Override
      public void remove() {
        throw new UnsupportedOperationException();
      }
    };
  }
 
  public int size() {
    return array.size();
  }
 
  protected abstract T basicGet(JsonArray array, int index);
}