JqueryStatementsBehavior.java

/**
 * Copyright (C) 2010 Asterios Raptis
 *
 * 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.
 */
package de.alpharogroup.wicket.behaviors;

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

import org.apache.log4j.Logger;
import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.util.lang.Args;
import org.odlabs.wiquery.core.javascript.ChainableStatement;
import org.odlabs.wiquery.core.javascript.JsStatement;

import lombok.Getter;

/**
 * The Class {@link JqueryStatementsBehavior} can create js statements from the given
 * {@link ChainableStatement} objects.
 */
public class JqueryStatementsBehavior extends Behavior
{
	/** The Constant logger. */
	protected static final Logger LOGGER = Logger
		.getLogger(JqueryStatementsBehavior.class.getName());

	/** The Constant serialVersionUID. */
	private static final long serialVersionUID = 1L;

	/** The chainable statement. */
	private List<ChainableStatement> chainableStatement;

	/**
	 * the rendered statement.
	 */
	@Getter
	private CharSequence renderedStatement;

	/**
	 * Flag if it is rendered.
	 */
	@Getter
	private boolean rendered;

	/**
	 * Instantiates a new {@link JqueryStatementsBehavior}.
	 */
	public JqueryStatementsBehavior()
	{
		this.chainableStatement = new ArrayList<>();
	}

	/**
	 * Instantiates a new {@link JqueryStatementsBehavior}.
	 *
	 * @param chainableStatements
	 *            the chainable statement objects.
	 */
	public JqueryStatementsBehavior(final List<ChainableStatement> chainableStatements)
	{
		Args.notNull(chainableStatements, "chainableStatement");
		this.chainableStatement = chainableStatements;
	}

	/**
	 * Adds the given {@link ChainableStatement} to the list and returns this object.
	 *
	 * @param chainableStatement
	 *            the chainable statement to add
	 * @return the jquery statements behavior
	 */
	public JqueryStatementsBehavior add(final ChainableStatement chainableStatement)
	{
		this.chainableStatement.add(chainableStatement);
		return this;
	}

	/**
	 * Factory method to create the rendered statement.
	 *
	 * @param component
	 *            the component
	 * @return the char sequence
	 */
	public CharSequence newRenderedStatement(final Component component)
	{
		JsStatement statement;
		if (component != null)
		{
			component.setOutputMarkupId(true);
			statement = new JsStatement().$(component);
		}
		else
		{
			statement = new JsStatement();
		}

		for (final ChainableStatement defaultChainableStatement : chainableStatement)
		{
			statement.chain(defaultChainableStatement);
		}
		this.renderedStatement = statement.render();
		this.rendered = true;
		return this.renderedStatement;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void renderHead(final Component component, final IHeaderResponse response)
	{
		super.renderHead(component, response);
		final CharSequence renderedStatement = newRenderedStatement(component);
		response.render(OnDomReadyHeaderItem.forScript(renderedStatement));
	}
}