JSOModel.java

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.bpm.console.client.model;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.core.client.JsArrayString;
import org.jboss.bpm.console.client.util.SimpleDateFormat;

import java.util.Date;
import java.util.HashSet;
import java.util.Set;

/**
 * Java overlay of a JavaScriptObject.
 * Borrowed from Matt Raible:
 * http://raibledesigns.com/rd/entry/json_parsing_with_javascript_overlay
 */
public abstract class JSOModel extends JavaScriptObject {

  // Overlay types always have protected, zero-arg constructors
  protected JSOModel() {
  }

  /**
   * Create an empty instance.
   *
   * @return new Object
   */
  public static native JSOModel create() /*-{
        return new Object();
    }-*/;

  /**
   * Convert a JSON encoded string into a JSOModel instance.
   * <p/>
   * Expects a JSON string structured like '{"foo":"bar","number":123}'
   *
   * @return a populated JSOModel object
   */
  public static native JSOModel fromJson(String jsonString) /*-{
        return eval('(' + jsonString + ')');
    }-*/;

  /**
   * Convert a JSON encoded string into an array of JSOModel instance.
   * <p/>
   * Expects a JSON string structured like '[{"foo":"bar","number":123}, {...}]'
   *
   * @return a populated JsArray
   */
  public static native JsArray<JSOModel> arrayFromJson(String jsonString) /*-{
        return eval('(' + jsonString + ')');
    }-*/;

  public final native boolean hasKey(String key) /*-{
        return this[key] != undefined;
    }-*/;

  public final native JsArrayString keys() /*-{
        var a = new Array();
        for (var p in this) { a.push(p); }
        return a;
    }-*/;

  @Deprecated
  public final Set<String> keySet() {
    JsArrayString array = keys();
    Set<String> set = new HashSet<String>();
    for (int i = 0; i < array.length(); i++) {
      set.add(array.get(i));
    }
    return set;
  }

  public final native String get(String key) /*-{
        return "" + this[key];
    }-*/;

  public final native String get(String key, String defaultValue) /*-{
        return this[key] ? ("" + this[key]) : defaultValue;
    }-*/;

  public final native void set(String key, String value) /*-{
        this[key] = value;
    }-*/;

  public final int getInt(String key) {
    return Integer.parseInt(get(key));
  }

  public final boolean getBoolean(String key) {
    return Boolean.parseBoolean(get(key));
  }

  public final native JSOModel getObject(String key) /*-{
        return this[key];
    }-*/;

  public final native JsArray<JSOModel> getArray(String key) /*-{
        return this[key] ? this[key] : new Array();
    }-*/;

  public final long getLong(String key)
  {
    return Long.valueOf(get(key));
  }

  public final Date getDate(String key)
  {
    Date result = null;
    String value = get(key);
    if(!isNull(value))
    {
      SimpleDateFormat df = new SimpleDateFormat();
      result = df.parse(value);
    }
    
    return result;
  }

  public final Date getDate(String key, Date fallback)
  {
    Date date = getDate(key);
    return date != null ? date : fallback;
  }

  private final boolean isNull(String val)
  {
    return (val != null && "null".equals(val) || "undefined".equals(val));
  }
}