de.micromata.genome.gwiki.web.tags.GWikiHtmlOptionsCollectionTag.java Source code

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Here is the source code for de.micromata.genome.gwiki.web.tags.GWikiHtmlOptionsCollectionTag.java

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//
// Copyright (C) 2010-2016 Roger Rene Kommer & Micromata GmbH
//
// 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.
//

package de.micromata.genome.gwiki.web.tags;

import java.util.Arrays;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.jsp.JspException;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.collections4.iterators.EnumerationIterator;

import de.micromata.genome.gwiki.utils.WebUtils;

/**
 * @author Roger Rene Kommer (r.kommer@micromata.de)
 * 
 */
public class GWikiHtmlOptionsCollectionTag extends GWikiBaseTag {

    private static final long serialVersionUID = -1732167133644150919L;

    @TagProperty
    private boolean escapeHtml;

    @TagProperty
    private String property;

    @TagProperty
    private String label;

    @TagProperty
    private String value;

    // CSS Style Support
    @ElementProperty
    @TagProperty
    private String style = null;

    @ElementProperty(name = "class")
    @TagProperty
    private String styleClass = null;

    @ElementProperty(name = "id")
    @TagProperty
    private String styleId = null;

    @SuppressWarnings({ "unchecked", "rawtypes" })
    protected Iterator<?> getIterator(Object collection) throws JspException {
        Class<?> clcls = collection.getClass();
        if (clcls.isArray()) {
            collection = Arrays.asList((Object[]) collection);
        }

        if (collection instanceof Collection) {
            return (((Collection<?>) collection).iterator());

        } else if (collection instanceof Iterator) {
            return ((Iterator<?>) collection);

        } else if (collection instanceof Map) {
            return (((Map<?, ?>) collection).entrySet().iterator());

        } else if (collection instanceof Enumeration) {
            return new EnumerationIterator((Enumeration<?>) collection);

        } else {
            throw new JspException("form." + property + " does not return a valid collection");
        }
    }

    @Override
    public int doStartTag() throws JspException {
        GWikiHtmlSelectTag selTag = (GWikiHtmlSelectTag) pageContext
                .getAttribute(GWikiHtmlSelectTag.GWikiHtmlSelectTag_KEY);
        if (selTag == null) {
            throw new JspException("cann use optionsCollection only inside a select tag");
        }
        Object collection = GWikiTagRenderUtils.readFormValue(pageContext, property);
        if (collection == null) {
            throw new JspException("Jsp: form." + property + " is a null value");
        }

        Iterator<?> iter = getIterator(collection);

        StringBuilder sb = new StringBuilder();

        while (iter.hasNext()) {

            Object bean = iter.next();
            Object beanLabel = null;
            Object beanValue = null;

            // Get the label for this option
            try {
                beanLabel = PropertyUtils.getProperty(bean, label);
                if (beanLabel == null) {
                    beanLabel = "";
                }
            } catch (Exception ex) {
                throw new JspException("Cannot access label ' " + label + " from collection form." + property + ": "
                        + ex.getMessage(), ex);
            }

            // Get the value for this option
            try {
                beanValue = PropertyUtils.getProperty(bean, value);
                if (beanValue == null) {
                    beanValue = "";
                }
            } catch (Exception ex) {
                throw new JspException("Cannot access value ' " + value + " from collection form." + property + ": "
                        + ex.getMessage(), ex);
            }
            String stringLabel = beanLabel.toString();
            String stringValue = beanValue.toString();
            sb.append("<option value=\"").append(escapeHtml ? WebUtils.escapeHtml(stringValue) : stringValue)
                    .append("\"");
            if (selTag.hasValue(stringValue) == true) {
                sb.append(" selected=\"selected\"");
            }
            sb.append(" ");
            GWikiTagRenderUtils.renderTagAttributes(this, sb);
            sb.append(">").append(escapeHtml ? WebUtils.escapeHtml(stringLabel) : stringLabel);
            sb.append("</option>");
        }
        GWikiTagRenderUtils.write(pageContext, sb.toString());
        return SKIP_BODY;
    }

    public String getStyle() {
        return style;
    }

    public void setStyle(String style) {
        this.style = style;
    }

    public String getStyleClass() {
        return styleClass;
    }

    public void setStyleClass(String styleClass) {
        this.styleClass = styleClass;
    }

    public String getStyleId() {
        return styleId;
    }

    public void setStyleId(String styleId) {
        this.styleId = styleId;
    }

    public String getProperty() {
        return property;
    }

    public void setProperty(String property) {
        this.property = property;
    }

    @Override
    public void prepare() {
        // TODO Auto-generated method stub

    }

    public String getLabel() {
        return label;
    }

    public void setLabel(String label) {
        this.label = label;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public boolean isEscapeHtml() {
        return escapeHtml;
    }

    public void setEscapeHtml(boolean escapeHtml) {
        this.escapeHtml = escapeHtml;
    }

}