alpha.portal.webapp.taglib.ConstantsTei.java Source code

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Here is the source code for alpha.portal.webapp.taglib.ConstantsTei.java

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/**************************************************************************
 * alpha-Portal: A web portal, for managing knowledge-driven 
 * ad-hoc processes, in form of case files.
 * ==============================================
 * Copyright (C) 2011-2012 by 
 *   - Christoph P. Neumann (http://www.chr15t0ph.de)
 *   - and the SWAT 2011 team
 **************************************************************************
 * 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.
 **************************************************************************
 * $Id$
 *************************************************************************/
package alpha.portal.webapp.taglib;

import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.jsp.tagext.TagData;
import javax.servlet.jsp.tagext.TagExtraInfo;
import javax.servlet.jsp.tagext.VariableInfo;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.appfuse.Constants;

/**
 * Implementation of <code>TagExtraInfo</code> for the <b>constants</b> tag,
 * identifying the scripting object(s) to be made visible.
 * 
 * @author Matt Raible
 */
public class ConstantsTei extends TagExtraInfo {

    /** The log. */
    private final Log log = LogFactory.getLog(ConstantsTei.class);

    /**
     * Return information about the scripting variables to be created.
     * 
     * @param data
     *            the input data
     * @return VariableInfo array of variable information
     */
    @Override
    public VariableInfo[] getVariableInfo(final TagData data) {
        // loop through and expose all attributes
        final List<VariableInfo> vars = new ArrayList<VariableInfo>();

        try {
            String clazz = data.getAttributeString("className");

            if (clazz == null) {
                clazz = Constants.class.getName();
            }

            final Class c = Class.forName(clazz);

            // if no var specified, get all
            if (data.getAttributeString("var") == null) {
                final Field[] fields = c.getDeclaredFields();

                AccessibleObject.setAccessible(fields, true);

                for (final Field field : fields) {
                    final String type = field.getType().getName();
                    vars.add(new VariableInfo(field.getName(),
                            ((field.getType().isArray()) ? type.substring(2, type.length() - 1) + "[]" : type),
                            true, VariableInfo.AT_END));
                }
            } else {
                final String var = data.getAttributeString("var");
                final String type = c.getField(var).getType().getName();
                vars.add(new VariableInfo(c.getField(var).getName(),
                        ((c.getField(var).getType().isArray()) ? type.substring(2, type.length() - 1) + "[]"
                                : type),
                        true, VariableInfo.AT_END));
            }
        } catch (final Exception cnf) {
            this.log.error(cnf.getMessage());
            cnf.printStackTrace();
        }

        return vars.toArray(new VariableInfo[] {});
    }
}