MultiListSelector.java

package br.com.citframework.tld;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;

public class MultiListSelector extends BodyTagSupport {

    private static final long serialVersionUID = 32377344027452200L;

    private String formName;
    private String name;
    private String property;
    private String collection;
    private String labelProperty;
    private String width;
    private String emptyItemLabel;
    private String lenSecondList;
    private String permitDuplicate;

    @Override
    public int doStartTag() throws JspException {
        final StringBuilder strBuff = new StringBuilder();
        Method metodo1 = null;
        Method metodo2 = null;
        final Object[] aux = null;
        Object value = null;
        Object desc = null;

        String id = this.getProperty();
        String label = this.getLabelProperty();
        id = "get" + id.substring(0, 1).toUpperCase() + id.substring(1);
        label = "get" + label.substring(0, 1).toUpperCase() + label.substring(1);

        Collection<?> col = (Collection<?>) pageContext.getRequest().getAttribute(this.getCollection());
        if (col == null) {
            col = (Collection<?>) pageContext.getSession().getAttribute(this.getCollection());
        }
        if (col == null) {
            col = new ArrayList<>();
        }
        final Iterator<?> it = col.iterator();
        Object obj;

        strBuff.append("<input type='hidden' name='valores" + this.getName() + "'>");

        strBuff.append("<table>");
        strBuff.append("	<tr>");
        strBuff.append("		<td>");

        strBuff.append("			<select name='" + this.getName() + "_select' style='width:" + this.getWidth() + "'>\n");
        strBuff.append("				<option value=''>" + this.getEmptyItemLabel() + "</option>\n");
        while (it.hasNext()) {
            obj = it.next();
            try {
                metodo1 = obj.getClass().getMethod(label);
                metodo2 = obj.getClass().getMethod(id);
            } catch (final SecurityException e) {
                e.printStackTrace();
            } catch (final NoSuchMethodException e) {
                e.printStackTrace();
            }
            try {
                desc = metodo1.invoke(obj, aux);
                value = metodo2.invoke(obj, aux);
            } catch (final IllegalArgumentException e) {
                e.printStackTrace();
            } catch (final IllegalAccessException e) {
                e.printStackTrace();
            } catch (final InvocationTargetException e) {
                e.printStackTrace();
            }
            strBuff.append("				<option value='" + value + "'>" + desc + "</option>\n");
        }
        strBuff.append("			</select>");
        strBuff.append("	</td>");
        strBuff.append("	<td>");
        strBuff.append("		<input type='button' name='btnAdd' value='Adicionar' onclick='" + this.getName() + "_AddItem(document." + this.getFormName() + "." + this.getName()
                + "_select,document." + this.getFormName() + "." + this.getName() + "_multBox);'>");
        strBuff.append("	</td>");
        strBuff.append("</tr>");
        strBuff.append("	<tr>");
        strBuff.append("		<td>");
        strBuff.append("   		<select name='" + this.getName() + "_multBox' size='" + this.getLenSecondList() + "' style='width:" + this.getWidth() + "'>");
        strBuff.append("   		</select>");
        strBuff.append("	</td>");
        strBuff.append("	<td>");
        strBuff.append("		<input type='button' name='btnRem' value='Remover' onclick='" + this.getName() + "_RemoveItem(document." + this.getFormName() + "." + this.getName()
                + "_multBox)'>");
        strBuff.append("	</td>");
        strBuff.append("</tr>");
        strBuff.append("</table>");
        strBuff.append("<script>");
        strBuff.append("function " + this.getName() + "_AddItem(origem, destino){");
        strBuff.append("	  var selIndex = origem.selectedIndex;");
        strBuff.append("	  if(selIndex < 0)");
        strBuff.append("			return;");
        strBuff.append("      var s1 = origem;");
        strBuff.append("      var s2 = destino;");
        strBuff.append("      if (s1.options[s1.selectedIndex].value==''){");
        strBuff.append("           alert('Selecione um item !');");
        strBuff.append("           return;");
        strBuff.append("      }");
        if (this.getPermitDuplicate().equalsIgnoreCase("N")) {
            strBuff.append("      if (!VERIFICA_DUP_" + this.getName() + "(s1,s2)){");
            strBuff.append("           alert('Este item j� existe selecionado !');");
            strBuff.append("           return;");
            strBuff.append("      }");
        }
        strBuff.append("      for(var i = 0; i < s1.options.length; i++){");
        strBuff.append("            if(s1.options[i].selected){");
        strBuff.append("                  var o = new Option(s1.options[i].text, s1.options[i].value);");
        strBuff.append("                  s2.options[s2.options.length] = o;");
        strBuff.append("            }");
        strBuff.append("      }");
        strBuff.append("	" + this.getName() + "_GeraValores(destino);");
        strBuff.append("}");
        strBuff.append("function " + this.getName() + "_RemoveItem(lista){");
        strBuff.append("	var selIndex = lista.selectedIndex;");
        strBuff.append("	if(selIndex < 0)");
        strBuff.append("		return;");
        strBuff.append("	lista.options[selIndex] = null;");
        strBuff.append("	" + this.getName() + "_GeraValores(lista);");
        strBuff.append("}");
        strBuff.append("function " + this.getName() + "_GeraValores(lista){");
        strBuff.append("      document." + this.getFormName() + ".valores" + this.getName() + ".value='';\n");
        strBuff.append("      var hid = document." + this.getFormName() + ".valores" + this.getName() + ";\n");
        strBuff.append("      for(var i = 0; i < lista.options.length; i++){");
        strBuff.append("           hid.value = hid.value + lista.options[i].value + '#'");
        strBuff.append("      }");
        strBuff.append("}");
        strBuff.append("function VERIFICA_DUP_" + this.getName() + "(origem, destino){");
        strBuff.append("      var s1 = origem;");
        strBuff.append("      var s2 = destino;");
        strBuff.append("      var valSel = s1.options[s1.selectedIndex].value;");
        strBuff.append("      for(var i = 0; i < s2.options.length; i++){");
        strBuff.append("            if(s2.options[i].value == valSel){");
        strBuff.append("                  return false;");
        strBuff.append("            }");
        strBuff.append("      }");
        strBuff.append("      return true;");
        strBuff.append("}");
        strBuff.append("</script>");

        try {
            pageContext.getOut().println(strBuff.toString());
        } catch (final IOException e) {
            e.printStackTrace();
            throw new JspException(e);
        }
        return SKIP_BODY;
    }

    public String getCollection() {
        return collection;
    }

    public void setCollection(final String collection) {
        this.collection = collection;
    }

    public String getEmptyItemLabel() {
        return emptyItemLabel;
    }

    public void setEmptyItemLabel(final String emptyItemLabel) {
        this.emptyItemLabel = emptyItemLabel;
    }

    public String getFormName() {
        return formName;
    }

    public void setFormName(final String formName) {
        this.formName = formName;
    }

    public String getLabelProperty() {
        return labelProperty;
    }

    public void setLabelProperty(final String labelProperty) {
        this.labelProperty = labelProperty;
    }

    public String getName() {
        return name;
    }

    public void setName(final String name) {
        this.name = name;
    }

    public String getProperty() {
        return property;
    }

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

    public String getWidth() {
        return width;
    }

    public void setWidth(final String width) {
        this.width = width;
    }

    public String getLenSecondList() {
        return lenSecondList;
    }

    public void setLenSecondList(final String lenSecondList) {
        this.lenSecondList = lenSecondList;
    }

    public String getPermitDuplicate() {
        return permitDuplicate;
    }

    public void setPermitDuplicate(final String permitDuplicate) {
        this.permitDuplicate = permitDuplicate;
    }

}