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

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Here is the source code for org.apache.wicket.markup.head.CssReferenceHeaderItem.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.List;
import java.util.Objects;

import org.apache.wicket.request.IRequestHandler;
import org.apache.wicket.request.Response;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.handler.resource.ResourceReferenceRequestHandler;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.request.resource.ResourceReference;
import org.apache.wicket.resource.bundles.IResourceBundle;
import org.apache.wicket.util.string.Strings;

/**
 * {@link HeaderItem} for style tags that are rendered using a {@link ResourceReference}.
 * 
 * @author papegaaij
 */
public class CssReferenceHeaderItem extends CssHeaderItem implements IReferenceHeaderItem {
    private static final long serialVersionUID = 1L;

    private final ResourceReference reference;
    private final String media;
    private final PageParameters pageParameters;
    private final String rel;

    /**
     * Creates a new {@code CSSReferenceHeaderItem}.
     * 
     * @param reference
     *            resource reference pointing to the CSS resource
     * @param pageParameters
     *            the parameters for this CSS resource reference
     * @param media
     *            the media type for this CSS ("print", "screen", etc.)
     * @param condition
     *            the condition to use for Internet Explorer conditional comments. E.g. "IE 7".
     */
    public CssReferenceHeaderItem(ResourceReference reference, PageParameters pageParameters, String media,
            String condition) {
        super(condition);
        this.reference = reference;
        this.pageParameters = pageParameters;
        this.media = media;
        this.rel = null;
    }

    /**
     * Creates a new {@code CSSReferenceHeaderItem}.
     * 
     * @param reference
     *            resource reference pointing to the CSS resource
     * @param pageParameters
     *            the parameters for this CSS resource reference
     * @param media
     *            the media type for this CSS ("print", "screen", etc.)
     * @param condition
     *            the condition to use for Internet Explorer conditional comments. E.g. "IE 7".
     * @param rel
     *            the rel attribute content
     */
    public CssReferenceHeaderItem(ResourceReference reference, PageParameters pageParameters, String media,
            String condition, String rel) {
        super(condition);
        this.reference = reference;
        this.pageParameters = pageParameters;
        this.media = media;
        this.rel = rel;
    }

    /**
     * @return resource reference pointing to the CSS resource
     * @see IReferenceHeaderItem#getReference()
     */
    @Override
    public ResourceReference getReference() {
        return reference;
    }

    /**
     * @return the media type for this CSS ("print", "screen", etc.)
     */
    public String getMedia() {
        return media;
    }

    /**
     * @return the rel attribute content
     */
    public String getRel() {
        return rel;
    }

    /**
     * @return the parameters for this CSS resource reference
     */
    public PageParameters getPageParameters() {
        return pageParameters;
    }

    @Override
    public List<HeaderItem> getDependencies() {
        return getReference().getDependencies();
    }

    @Override
    public Iterable<? extends HeaderItem> getProvidedResources() {
        if (getReference() instanceof IResourceBundle)
            return ((IResourceBundle) getReference()).getProvidedResources();
        return super.getProvidedResources();
    }

    @Override
    public void render(Response response) {
        internalRenderCSSReference(response, getUrl(), media, getCondition(), getRel());
    }

    @Override
    public Iterable<?> getRenderTokens() {
        return Arrays.asList("css-" + Strings.stripJSessionId(getUrl()) + "-" + media);
    }

    @Override
    public String toString() {
        return "CSSReferenceHeaderItem(" + getReference() + ", " + getPageParameters() + ")";
    }

    private String getUrl() {
        IRequestHandler handler = new ResourceReferenceRequestHandler(getReference(), getPageParameters());
        return RequestCycle.get().urlFor(handler).toString();
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), reference, media, pageParameters, rel);
    }

    @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;
        CssReferenceHeaderItem that = (CssReferenceHeaderItem) o;
        return Objects.equals(reference, that.reference) && Objects.equals(media, that.media)
                && Objects.equals(rel, that.rel) && Objects.equals(pageParameters, that.pageParameters);
    }
}