org.apache.wicket.markup.head.StringHeaderItem.java Source code

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Here is the source code for org.apache.wicket.markup.head.StringHeaderItem.java

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/*
 * 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.Collections;
import java.util.Objects;

import org.apache.wicket.request.Response;
import org.apache.wicket.util.lang.Args;

/**
 * Free form {@code HeaderItem}. No checks are performed on what is added to the header.
 * 
 * @author papegaaij
 */
public class StringHeaderItem extends HeaderItem {
    /**
     * Creates a {@link StringHeaderItem} for the snippet.
     * 
     * @param string
     *            string to be rendered to head
     * 
     * @return A newly created {@link StringHeaderItem}.
     */
    public static StringHeaderItem forString(CharSequence string) {
        return new StringHeaderItem(string);
    }

    private final CharSequence string;

    /**
     * Construct.
     * 
     * @param string
     */
    public StringHeaderItem(CharSequence string) {
        this.string = Args.notNull(string, "string");
    }

    /**
     * @return the string that gets added to the header.
     */
    public CharSequence getString() {
        return string;
    }

    @Override
    public void render(Response response) {
        response.write(getString());
    }

    @Override
    public Iterable<?> getRenderTokens() {
        return Collections.singletonList(getString());
    }

    @Override
    public String toString() {
        return "StringHeaderItem(" + getString() + ")";
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;
        StringHeaderItem that = (StringHeaderItem) o;
        return Objects.equals(string, that.string);
    }

    @Override
    public int hashCode() {
        return Objects.hash(string);
    }
}