gov.nih.nci.calims2.taglib.EnumTag.java Source code

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Here is the source code for gov.nih.nci.calims2.taglib.EnumTag.java

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/*L
 * Copyright Moxie Informatics.
 *
 * Distributed under the OSI-approved BSD 3-Clause License.
 * See http://ncip.github.com/calims/LICENSE.txt for details.
 */

/**
 *
 */
package gov.nih.nci.calims2.taglib;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Locale;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.commons.lang.StringEscapeUtils;

import gov.nih.nci.calims2.util.enumeration.I18nEnumeration;

/**
 * Custom tag for rendering of I18nEnumerations and their optional properties.
 * 
 * @author viseem
 */
public class EnumTag extends TagSupport {

    private static final long serialVersionUID = -3006638793663509544L;

    private I18nEnumeration value;
    private String propertyName;

    /**
     * {@inheritDoc}
     */
    public int doStartTag() throws JspException {
        try {
            Locale locale = TagHelper.getRequestContext(pageContext).getLocale();
            if (value != null) {
                String message = (propertyName == null) ? value.getLocalizedValue(locale)
                        : getPropertyValue(locale);
                pageContext.getOut().print(StringEscapeUtils.escapeHtml(message));
            }
            return SKIP_BODY;
        } catch (IOException e) {
            throw new JspException(e);
        } catch (Exception e) {
            throw new JspTagException(e);
        }
    }

    /**
     * Gets the value of the optional property in the specified locale.
     * @param locale The locale
     * @return The optional property in the specified locale
     */
    private String getPropertyValue(Locale locale) throws Exception {
        try {
            String methodName = "get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1);
            Method m = value.getClass().getMethod(methodName, Locale.class);
            return (String) m.invoke(value, locale);
        } catch (IllegalArgumentException e) {
            throw new InternalError("Could not happen. Method take a locale argument");
        }
    }

    /**
     * {@inheritDoc}
     */
    public int doEndTag() {
        propertyName = null;
        return EVAL_PAGE;
    }

    /**
     * @return the value
     */
    public I18nEnumeration getValue() {
        return value;
    }

    /**
     * @param value the value to set
     */
    public void setValue(I18nEnumeration value) {
        this.value = value;
    }

    /**
     * @return the propertyName
     */
    public String getPropertyName() {
        return propertyName;
    }

    /**
     * @param propertyName the propertyName to set
     */
    public void setPropertyName(String propertyName) {
        this.propertyName = propertyName;
    }

}