// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.debug.core.model;

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

import org.chromium.sdk.JsArray;
import org.chromium.sdk.JsVariable;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IIndexedValue;
import org.eclipse.debug.core.model.IVariable;

/**
 * An IIndexedValue implementation for an array element range using a JsArray
 * instance.
 */
public class ArrayValue extends Value implements IIndexedValue {

  private final IVariable[] elements;

  public ArrayValue(IChromiumDebugTarget debugTarget, JsArray array) {
    super(debugTarget, array);
    this.elements = createElements();
  }

  private IVariable[] createElements() {
    SortedMap<Integer, ? extends JsVariable> elements = ((JsArray) getJsValue()).toSparseArray();
    List<IVariable> variables = new ArrayList<IVariable>(elements.size());
    for (JsVariable jsVar : elements.values()) {
      variables.add(new Variable(getDebugTarget(), jsVar, false));
    }
    return variables.toArray(new IVariable[variables.size()]);
  }

  public int getInitialOffset() {
    return 0;
  }

  public int getSize() throws DebugException {
    return elements.length;
  }

  public IVariable getVariable(int offset) throws DebugException {
    return elements[offset];
  }

  public IVariable[] getVariables(int offset, int length) throws DebugException {
    IVariable[] result = new IVariable[length];
    System.arraycopy(elements, offset, result, 0, length);
    return result;
  }

  @Override
  public IVariable[] getVariables() throws DebugException {
    return elements;
  }

  @Override
  public boolean hasVariables() throws DebugException {
    return elements.length > 0;
  }

}