// 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 org.chromium.debug.core.ChromiumDebugPlugin;

import org.chromium.debug.core.util.JsValueStringifier;

import org.chromium.sdk.JsArray;

import org.chromium.sdk.JsValue;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Status;

import org.eclipse.debug.core.DebugException;

import org.eclipse.debug.core.model.IValue;

import org.eclipse.debug.core.model.IVariable;

/**

 * A generic (non-array) implementation of IValue using a JsValue instance.

 */

public class Value extends DebugElementImpl implements IValue {

  private static final IVariable[] EMPTY_VARIABLES = new IVariable[0];

  private final JsValue value;

  private IVariable[] variables;

  public static Value create(IChromiumDebugTarget debugTarget, JsValue value) {

    if (JsValue.Type.TYPE_ARRAY == value.getType()) {

      return new ArrayValue(debugTarget, (JsArray) value);

    }

    return new Value(debugTarget, value);

  }

  Value(IChromiumDebugTarget debugTarget, JsValue value) {

    super(debugTarget);

    this.value = value;

  }

  public String getReferenceTypeName() throws DebugException {

    return value.getType().toString();

  }

  public String getValueString() throws DebugException {

    String valueText = JsValueStringifier.toVisibleString(value);

    if (value.asObject() != null) {

      String ref = value.asObject().getRefId();

      if (ref != null) {

        valueText = valueText + "  (id=" + ref + ")";

      }

    }

    return valueText;

  }

  public IVariable[] getVariables() throws DebugException {

    try {

      if (variables == null) {

        if (value.asObject() != null) {

          variables = StackFrame.wrapVariables(getDebugTarget(), value.asObject().getProperties(),

              value.asObject().getInternalProperties());

        } else {

          variables = EMPTY_VARIABLES;

        }

      }

      return variables;

    } catch (RuntimeException e) {

      // We shouldn't throw RuntimeException from here, because calling

      // ElementContentProvider#update will forget to call update.done().

      throw new DebugException(new Status(IStatus.ERROR, ChromiumDebugPlugin.PLUGIN_ID,

          "Failed to read variables", e)); //$NON-NLS-1$

    }

  }

  public boolean hasVariables() throws DebugException {

    return value.asObject() != null;

  }

  public boolean isAllocated() throws DebugException {

    return false;

  }

  public JsValue getJsValue() {

    return value;

  }

}