eu.uqasar.web.components.behaviour.user.UserProfilePictureBackgroundBehaviour.java Source code

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Here is the source code for eu.uqasar.web.components.behaviour.user.UserProfilePictureBackgroundBehaviour.java

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package eu.uqasar.web.components.behaviour.user;

/*
 * #%L
 * U-QASAR
 * %%
 * Copyright (C) 2012 - 2015 U-QASAR Consortium
 * %%
 * Licensed 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.
 * #L%
 */

import eu.uqasar.model.user.User;
import eu.uqasar.web.UQasar;
import eu.uqasar.web.provider.UrlProvider;
import javax.inject.Inject;
import static org.apache.wicket.AttributeModifier.VALUELESS_ATTRIBUTE_ADD;
import static org.apache.wicket.AttributeModifier.VALUELESS_ATTRIBUTE_REMOVE;
import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.cdi.CdiContainer;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.parser.XmlTag;
import org.apache.wicket.model.IComponentAssignedModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.io.IClusterable;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.string.Strings;
import org.apache.wicket.util.value.IValueMap;

/**
 *
 *
 */
public class UserProfilePictureBackgroundBehaviour extends Behavior implements IClusterable {

    /**
     * Attribute specification.
     */
    private final String attribute = "style";
    private User user;
    private final boolean caching;
    private final User.PictureDimensions dimension;

    @Inject
    UrlProvider urlProvider;

    public UserProfilePictureBackgroundBehaviour(User.PictureDimensions dimension) {
        this(null, dimension, true);
    }

    public UserProfilePictureBackgroundBehaviour(User user, User.PictureDimensions dimension) {
        this(user, dimension, true);
    }

    private UserProfilePictureBackgroundBehaviour(User user, User.PictureDimensions dimension, boolean caching) {
        CdiContainer.get().getNonContextualManager().inject(this);
        if (user == null) {
            if (UQasar.exists() && UQasar.getSession() != null) {
                this.user = UQasar.getSession().getLoggedInUser();
            }
        } else {
            this.user = user;
        }
        this.caching = caching;
        this.dimension = dimension;
        Args.notNull(this.user, "user");
        Args.notNull(this.dimension, "dimension");
        Args.notNull(this.urlProvider, "urlProvider");
    }

    private IModel<String> getReplaceModel() {
        final String url = urlProvider.urlFor(this.user.getProfilePictureReference(),
                caching ? this.user.getUncachedProfilePicturePageParameters(dimension)
                        : this.user.getProfilePicturePageParameters(dimension));
        final String imageCSS = String.format("background-image: url('%s');", url);
        return Model.of(imageCSS);
    }

    @Override
    public final void onComponentTag(Component component, ComponentTag tag) {
        if (tag.getType() != XmlTag.TagType.CLOSE) {
            replaceAttributeValue(component, tag);
        }
    }

    /**
     * Checks the given component tag for an instance of the attribute to modify
     * and if all criteria are met then replace the value of this attribute with
     * the value of the contained model object.
     *
     * @param component The component
     * @param tag The tag to replace the attribute value for
     */
    private void replaceAttributeValue(final Component component, final ComponentTag tag) {
        if (isEnabled(component)) {
            final IValueMap attributes = tag.getAttributes();
            final Object replacementValue = getReplacementOrNull(component);

            if (VALUELESS_ATTRIBUTE_ADD == replacementValue) {
                attributes.put(attribute, null);
            } else if (VALUELESS_ATTRIBUTE_REMOVE == replacementValue) {
                attributes.remove(attribute);
            } else {
                final String value = toStringOrNull(attributes.get(attribute));
                final String newValue = newValue(value, toStringOrNull(replacementValue));
                if (newValue != null) {
                    attributes.put(attribute, newValue);
                }
            }
        }
    }

    private String newValue(String currentValue, String appendValue) {
        // Short circuit when one of the values is empty: return the other value.
        if (Strings.isEmpty(currentValue)) {
            return appendValue != null ? appendValue : null;
        } else if (Strings.isEmpty(appendValue)) {
            return currentValue != null ? currentValue : null;
        }

        String sb = currentValue + (getSeparator() == null ? "" : getSeparator()) + appendValue;
        return sb;
    }

    /**
     * Gets the separator used by attribute appenders and prependers.
     *
     * @return the separator used by attribute appenders and prependers.
     */
    private String getSeparator() {
        return ";";
    }

    /**
     * gets replacement with null check.
     *
     * @param component
     * @return replacement value
     */
    private Object getReplacementOrNull(final Component component) {
        IModel<?> model = getReplaceModel();
        if (model instanceof IComponentAssignedModel) {
            model = ((IComponentAssignedModel<?>) model).wrapOnAssignment(component);
        }
        return (model != null) ? model.getObject() : null;
    }

    /**
     * gets replacement as a string with null check.
     *
     * @param replacementValue
     * @return replacement value as a string
     */
    private String toStringOrNull(final Object replacementValue) {
        return (replacementValue != null) ? replacementValue.toString() : null;
    }

}