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package org.glassfish.admingui.common.util;

import java.io.ByteArrayInputStream;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;

/**
 *
 * @author jdlee
 */
public class MiscUtil {

    /**
     * This utility method can be used to create a ValueExpression and set its value.
     * An example usage might look like this:
     * 
     *      ValueExpression ve = MiscUtil.setValueExpression("#{myMap}", new HashMap());
     * 
     * @param expression The expression to create. Note that this requires the #{ and } wrappers.
     * @param value  The value to which to set the ValueExpression
     * @return The newly created ValueExpression
     */
    public static ValueExpression setValueExpression(String expression, Object value) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ValueExpression ve = facesContext.getApplication().getExpressionFactory().
                createValueExpression(facesContext.getELContext(), expression, Object.class);
        ve.setValue(facesContext.getELContext(), value);

        return ve;
    }

    public static Document getDocument(String input) {
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(new ByteArrayInputStream(input.getBytes()));
            return doc;
        } catch (Exception ex) {
            GuiUtil.prepareAlert("error", ex.getMessage() + ": " + input, null);
            return null;
        }
    }
    
}