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

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Here is the source code for org.apache.wicket.markup.head.JavaScriptContentHeaderItem.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.Arrays;
import java.util.Collections;
import java.util.Objects;

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;

    /**
     * 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;
        setId(id);
    }

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

    @Override
    public void render(Response response) {
        boolean hasCondition = Strings.isEmpty(getCondition()) == false;
        if (hasCondition) {
            response.write("<!--[if ");
            response.write(getCondition());
            response.write("]>");
        }
        JavaScriptUtils.writeJavaScript(response, getJavaScript(), getId());

        if (hasCondition) {
            response.write("<![endif]-->\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 boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;
        if (!super.equals(o))
            return false;
        JavaScriptContentHeaderItem that = (JavaScriptContentHeaderItem) o;
        return Objects.equals(javaScript, that.javaScript);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), javaScript);
    }
}