ImageRotateAndResize.java

/*
 * Copyright 2011 PrimeFaces Extensions.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * $Id: ImageRotateAndResize.java 533 2011-12-03 14:02:23Z Zoigln@googlemail.com $
 */

package org.primefaces.extensions.component.imagerotateandresize;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import javax.el.ValueExpression;
import javax.faces.application.ResourceDependencies;
import javax.faces.application.ResourceDependency;
import javax.faces.component.UIComponentBase;
import javax.faces.component.UINamingContainer;
import javax.faces.component.behavior.ClientBehaviorHolder;
import javax.faces.context.FacesContext;
import javax.faces.event.BehaviorEvent;
import javax.faces.event.FacesEvent;

import org.primefaces.component.api.Widget;
import org.primefaces.extensions.component.base.Attachable;
import org.primefaces.extensions.event.ResizeEvent;
import org.primefaces.extensions.event.RotateEvent;
import org.primefaces.util.Constants;

/**
 * Component class for the <code>ImageRotateAndResize</code> component.
 *
 * @author Thomas Andraschko / last modified by $Author: Zoigln@googlemail.com $
 * @version $Revision: 533 $
 * @since 0.1
 */
@ResourceDependencies({
	@ResourceDependency(library = "primefaces", name = "jquery/jquery.js"),
	@ResourceDependency(library = "primefaces", name = "primefaces.js"),
	@ResourceDependency(library = "primefaces-extensions", name = "primefaces-extensions.js")
})
public class ImageRotateAndResize extends UIComponentBase implements Widget, ClientBehaviorHolder, Attachable {

	public static final String COMPONENT_FAMILY = "org.primefaces.extensions.component";
	private static final String DEFAULT_RENDERER = "org.primefaces.extensions.component.ImageRotateAndResizeRenderer";
	private static final String OPTIMIZED_PACKAGE = "org.primefaces.extensions.component.";

	public static final String EVENT_ROTATE = "rotate";
	public static final String EVENT_RESIZE = "resize";

	private static final Collection<String> EVENT_NAMES =
			Collections.unmodifiableCollection(Arrays.asList(EVENT_ROTATE, EVENT_RESIZE));

	/**
	 * Properties that are tracked by state saving.
	 *
	 * @author Thomas Andraschko / last modified by $Author: Zoigln@googlemail.com $
	 * @version $Revision: 533 $
	 */
	protected enum PropertyKeys {

		widgetVar,
		forValue("for");

		private String toString;

		PropertyKeys(final String toString) {
			this.toString = toString;
		}

		PropertyKeys() {
		}

		@Override
		public String toString() {
			return ((this.toString != null) ? this.toString : super.toString());
		}
	}

	public ImageRotateAndResize() {
		setRendererType(DEFAULT_RENDERER);
	}

	@Override
	public String getFamily() {
		return COMPONENT_FAMILY;
	}

	@Override
	public Collection<String> getEventNames() {
		return EVENT_NAMES;
	}

	public String getWidgetVar() {
		return (String) getStateHelper().eval(PropertyKeys.widgetVar, null);
	}

	public void setWidgetVar(final String widgetVar) {
		setAttribute(PropertyKeys.widgetVar, widgetVar);
	}

	@Override
	public String getFor() {
		return (String) getStateHelper().eval(PropertyKeys.forValue, null);
	}

	@Override
	public void setFor(final String forValue) {
		setAttribute(PropertyKeys.forValue, forValue);
	}

	@Override
	public String resolveWidgetVar() {
		final FacesContext context = FacesContext.getCurrentInstance();
		final String userWidgetVar = (String) getAttributes().get(PropertyKeys.widgetVar.toString());

		if (userWidgetVar != null) {
			return userWidgetVar;
		}

		return "widget_" + getClientId(context).replaceAll("-|" + UINamingContainer.getSeparatorChar(context), "_");
	}

	@SuppressWarnings("unchecked")
	public void setAttribute(final PropertyKeys property, final Object value) {
		getStateHelper().put(property, value);

		List<String> setAttributes = (List<String>) this.getAttributes().get(
				"javax.faces.component.UIComponentBase.attributesThatAreSet");
		if (setAttributes == null) {
			final String cname = this.getClass().getName();
			if (cname != null && cname.startsWith(OPTIMIZED_PACKAGE)) {
				setAttributes = new ArrayList<String>(6);
				this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
			}
		}
		if (setAttributes != null && value == null) {
			final String attributeName = property.toString();
			final ValueExpression ve = getValueExpression(attributeName);
			if (ve == null) {
				setAttributes.remove(attributeName);
			} else if (!setAttributes.contains(attributeName)) {
				setAttributes.add(attributeName);
			}
		}
	}

	@Override
	public void queueEvent(final FacesEvent event) {
		final FacesContext context = FacesContext.getCurrentInstance();
		final Map<String, String> params = context.getExternalContext().getRequestParameterMap();
		final String clientId = getClientId(context);

		if (isRequestSource(clientId, params)) {
			final String eventName = params.get(Constants.PARTIAL_BEHAVIOR_EVENT_PARAM);

			final BehaviorEvent behaviorEvent = (BehaviorEvent) event;

			if (eventName.equals(EVENT_RESIZE)) {
				final double width = Double.parseDouble(params.get(clientId + "_width"));
				final double height = Double.parseDouble(params.get(clientId + "_height"));

				final ResizeEvent resizeEvent = new ResizeEvent(
						this,
						behaviorEvent.getBehavior(),
						width,
						height);

				super.queueEvent(resizeEvent);

			} else if (eventName.equals(EVENT_ROTATE)) {
				final int degree = Integer.parseInt(params.get(clientId + "_degree"));

				final RotateEvent rotateEvent = new RotateEvent(
						this,
						behaviorEvent.getBehavior(),
						degree);

				super.queueEvent(rotateEvent);
			}
		} else {
			super.queueEvent(event);
		}
	}

	private boolean isRequestSource(final String clientId, final Map<String, String> params) {
		return clientId.equals(params.get(Constants.PARTIAL_SOURCE_PARAM));
	}
}