org.apache.wicket.markup.head.JavaScriptContentHeaderItem Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of wicket-core Show documentation

Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

There is a newer version: 10.0.0

Show newest version

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.wicket.markup.head;

import java.util.Arrays;
import java.util.Collections;

import org.apache.wicket.request.Response;
import org.apache.wicket.core.util.string.JavaScriptUtils;
import org.apache.wicket.util.string.Strings;

/**
 * {@link HeaderItem} for internal (embedded in the header) javascript content.
 * 
 * @author papegaaij
 */
public class JavaScriptContentHeaderItem extends JavaScriptHeaderItem
{
	private final CharSequence javaScript;
	private final String id;

	/**
	 * Creates a new {@code JavaScriptContentHeaderItem}.
	 * 
	 * @param javaScript
	 *            javascript content to be rendered.
	 * @param id
	 *            unique id for the javascript element. This can be null, however in that case the
	 *            ajax header contribution can't detect duplicate script fragments.
	 * @param condition
	 *            the condition to use for Internet Explorer conditional comments. E.g. "IE 7".
	 */
	public JavaScriptContentHeaderItem(CharSequence javaScript, String id, String condition)
	{
		super(condition);
		this.javaScript = javaScript;
		this.id = id;
	}

	/**
	 * @return javascript content to be rendered.
	 */
	public CharSequence getJavaScript()
	{
		return javaScript;
	}

	/**
	 * @return unique id for the javascript element.
	 */
	public String getId()
	{
		return id;
	}

	@Override
	public void render(Response response)
	{
		boolean hasCondition = Strings.isEmpty(getCondition()) == false;
		if (hasCondition)
		{
			response.write("\n");
		}
	}

	@Override
	public Iterable getRenderTokens()
	{
		if (Strings.isEmpty(getId()))
			return Collections.singletonList(getJavaScript());
		return Arrays.asList(getId(), getJavaScript());
	}

	@Override
	public String toString()
	{
		return "JavaScriptHeaderItem(" + getJavaScript() + ")";
	}

	@Override
	public int hashCode()
	{
		return getJavaScript().hashCode();
	}

	@Override
	public boolean equals(Object obj)
	{
		if (obj instanceof JavaScriptContentHeaderItem)
			return ((JavaScriptContentHeaderItem)obj).getJavaScript().equals(getJavaScript());
		return false;
	}
}