/*
 * 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.request.resource;

import java.nio.charset.Charset;

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

/**
 * An {@link org.apache.wicket.request.resource.IResource} for CharSequences.
 * The char sequence can be static - passed to the constructor,
 * or dynamic - by overriding {@link #getData(org.apache.wicket.request.resource.IResource.Attributes)}
 */
public class CharSequenceResource extends BaseDataResource<CharSequence>
{
	private static final long serialVersionUID = 1L;

	/** Charset name for resource */
	private String charsetName;

	/**
	 * Creates a {@link org.apache.wicket.request.resource.CharSequenceResource} which will provide its data dynamically with
	 * {@link #getData(org.apache.wicket.request.resource.IResource.Attributes)}
	 *
	 * @param contentType
	 *            The Content type of the array.
	 */
	public CharSequenceResource(final String contentType)
	{
		super(contentType);
	}

	/**
	 * Creates a Resource from the given char sequence with its content type
	 *
	 * @param contentType
	 *            The Content type of the array.
	 * @param data
	 *            The data
	 */
	public CharSequenceResource(final String contentType, final CharSequence data)
	{
		super(contentType, data);
	}

	/**
	 * Creates a Resource from the given char sequence with its content type
	 *
	 * @param contentType
	 *            The Content type of the array.
	 * @param data
	 *            The data
	 * @param filename
	 *            The filename that will be set as the Content-Disposition header.
	 */
	public CharSequenceResource(final String contentType, final CharSequence data, final String filename)
	{
		super(contentType, data, filename);
	}

	@Override
	protected void writeData(Response response, CharSequence data)
	{
		response.write(data);
	}

	@Override
	protected Long getLength(CharSequence data)
	{
		return (long) Strings.lengthInBytes(data.toString(), getCharset());
	}

	/**
	 * @return Charset for resource
	 */
	protected Charset getCharset()
	{
		return (charsetName != null) ? Charset.forName(charsetName) : null;
	}

	/**
	 * Sets the character set used for reading this resource.
	 *
	 * @param charset
	 *            Charset for component
	 */
	public void setCharset(final Charset charset)
	{
		// java.nio.Charset itself is not serializable so we can only store the name
		charsetName = (charset != null) ? charset.name() : null;
	}

}