org.kuali.student.ap.coursesearch.util.CollectionListPropertyEditor.java Source code

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Here is the source code for org.kuali.student.ap.coursesearch.util.CollectionListPropertyEditor.java

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package org.kuali.student.ap.coursesearch.util;
/**
 * Copyright 2005-2012 The Kuali Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
 *
 * 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.
 */

import java.beans.PropertyEditorSupport;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CollectionListPropertyEditor extends PropertyEditorSupport implements Serializable {

    private final static Logger logger = LoggerFactory.getLogger(CollectionListPropertyEditor.class);

    //  Default parameter values.
    protected CollectionListPropertyEditorHtmlListType listType = CollectionListPropertyEditorHtmlListType.DL;
    protected String emptyListMessage = "";

    private List<String> styleClasses;
    private List<String> emptyListStyleClasses;

    private boolean applyClassOnItem = false;

    public CollectionListPropertyEditor() {
        styleClasses = new ArrayList<String>();
        emptyListStyleClasses = new ArrayList<String>();
    }

    @Override
    public void setValue(Object value) {
        if (value == null) {
            logger.error("Collection was null.");
            return;
        }

        if (!(value instanceof Collection)) {
            logger.error("Value was type [{}] instead of Collection.", value.getClass());
            return;
        }

        super.setValue(value);
    }

    @Override
    public String getAsText() {
        Collection<Object> collection = (Collection<Object>) super.getValue();

        boolean isCollectionNullOrEmpty = false;
        if (collection == null || collection.isEmpty()) {
            isCollectionNullOrEmpty = true;
        }

        /*
         *  If the collection is empty and no empty list message is defined then return an empty string.
         *  Otherwise, add an empty list message to the list.
         */
        String styleClassNames = "";
        if (isCollectionNullOrEmpty) {
            if (this.emptyListMessage.length() == 0) {
                return "";
            } else {
                styleClassNames = getEmptyListStyleClassesAsString();
            }
        } else {
            styleClassNames = getStyleClassesAsString();
        }

        StringBuilder formattedText = new StringBuilder();
        formattedText.append("<" + listType.getListElementName() + " class=\"" + styleClassNames + "\">");

        if (isCollectionNullOrEmpty) {
            formattedText.append(wrapListItem(emptyListMessage));
        } else {
            formattedText.append(makeHtmlList(collection));
        }

        formattedText.append("</" + listType.getListElementName() + ">");
        return formattedText.toString();
    }

    protected String makeHtmlList(Collection c) {
        StringBuilder list = new StringBuilder();
        Iterator<Object> i = c.iterator();
        while (i.hasNext()) {
            Object elem = i.next();
            list.append(wrapListItem(elem.toString()));
        }
        return list.toString();
    }

    protected String wrapListItem(String value) {
        StringBuilder elementText = new StringBuilder();

        // Strip out any numbers from the value and use the text for class on the list item
        // Apply style class on item only if specified to do so
        String liClass = (applyClassOnItem) ? " class=\"" + value.replaceAll("\\d*$", "").trim() + "\"" : "";
        elementText.append("<" + listType.getListItemElementName() + liClass + ">");
        elementText.append(value);
        elementText.append("</" + listType.getListItemElementName() + ">");
        return elementText.toString();
    }

    /**
     * Specifies the type of list to render.
     *
     * @param listType
     */
    public void setListType(CollectionListPropertyEditorHtmlListType listType) {
        this.listType = listType;
    }

    public CollectionListPropertyEditorHtmlListType getListType() {
        return this.listType;
    }

    /**
     * Specifies the text to use in case the provided Collection is null or empty.
     * If left unset an empty string will be return by format().
     *
     * @param emptyListMessage
     */
    public void setEmptyListMessage(String emptyListMessage) {
        this.emptyListMessage = emptyListMessage;
    }

    public String getEmptyListMessage() {
        return this.emptyListMessage;
    }

    public List<String> getStyleClasses() {
        return this.styleClasses;
    }

    public void setStyleClasses(List<String> styleClasses) {
        this.styleClasses = styleClasses;
    }

    public String getStyleClassesAsString() {
        if (styleClasses != null) {
            return StringUtils.join(styleClasses, " ");
        }
        return "";
    }

    public List<String> getEmptyListStyleClasses() {
        return this.emptyListStyleClasses;
    }

    public void setEmptyListStyleClasses(List<String> styleClasses) {
        this.emptyListStyleClasses = styleClasses;
    }

    public String getEmptyListStyleClassesAsString() {
        if (emptyListStyleClasses != null) {
            return StringUtils.join(emptyListStyleClasses, " ");
        }
        return "";
    }

    public boolean isApplyClassOnItem() {
        return applyClassOnItem;
    }

    public void setApplyClassOnItem(boolean applyClassOnItem) {
        this.applyClassOnItem = applyClassOnItem;
    }
}