comboselecttag.java

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package ar.com.koalas.providers.taglibs.comboselect;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;

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

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.Transformer;
import org.apache.struts.util.RequestUtils;

public class ComboSelectTag extends BodyTagSupport {
	private static final String ID_COMBO = ComboSelectTag.class.getName() + ".idCombo";
	private String property = null;
	private String name = null;
	private String metadata;
	private String[] metadataArray;
	private String[] cmbnames;
	private String[] cmbvalues;
	private String[] cmbonchange;
	private int id;
	private String addAllLabel = null;
	private String addSelectLabel = null;
	private List v = null;
	private Map selectData = null;
	
	public void addDdl(Ddl d) {
		v.add(d);
	}

	public void putSelectData(String property, SelectData data) {
		this.selectData.put(property, data);
	}
	
	private Iterator getFilteredIterator(final String parentKey, Map item, SelectData data) {
		if(parentKey==null)
			return data.getIterator();
		
		Iterator sdItInput = data.getIterator();
		//pasa el iterator a una coleccion.
		Collection colAux = CollectionUtils.collect(sdItInput, new Transformer() { public Object transform(Object arg0) { return arg0; }});
		data.setIterator(colAux.iterator());
		//filtra solo los que coincidan con el key del padre
		final Object parentKeyValue = item.get(parentKey);
		Collection filtered = CollectionUtils.select(colAux, new Predicate() {
			public boolean evaluate(Object obj) {
				try {
					Object key = BeanUtils.getProperty(obj, parentKey);
					//TODO controlar null, tipos, etc...
					return parentKeyValue.equals(key);
				} catch (Exception e) {
					e.printStackTrace();
				}			
				return false;
			}
		});
		
		return filtered.iterator();
	}
	
	private void populateMatrix(Collection col, Map item, Ddl ddl, int[] level, String parentKey) {
		SelectData data = (SelectData)this.selectData.get(ddl.getProperty());
		Iterator sdIt = this.getFilteredIterator(parentKey, item, data);
		
		while(sdIt.hasNext()) {
			Object obj = sdIt.next();
			try {
				Object key = BeanUtils.getProperty(obj, data.getKey());
				Object description = BeanUtils.getProperty(obj, data.getDescription());
				item.put(data.getKey(), key);
				item.put(data.getDescription(), description);
			} catch (Exception e) {
				e.printStackTrace();
			}			
			level[0]++;
			if(level[0]<v.size()) {
				Ddl ddlnext = (Ddl)v.get(level[0]);
				this.populateMatrix(col, item, ddlnext, level, data.getKey());
				level[0]--;				
			} else {
				level[0]--;
				col.add(new HashMap(item));
			}
		}
	}
	
	private Collection getPropertyFromContext() throws JspException {
		//primero me fijo si tengo selectData
		if(this.selectData.size()>0) {
			Ddl ddlroot = (Ddl)v.get(0); //obtiene el primero
			Collection col = new ArrayList();
			this.populateMatrix(col, new HashMap(), ddlroot, new int[] {0}, null);
			return col;
		} else {
			// Identify the bean containing our collection
			Object bean = null;
			try {
				if (name != null)
					if (property != null)
						bean = RequestUtils.lookup(pageContext, name, property, "request");
					else
						bean = RequestUtils.lookup(pageContext, name, "request");
				else
					bean = RequestUtils.lookup(pageContext, property, "request");
			} catch (Exception ex) {
			}
			if(bean==null) {
				try {
					if (name != null)
						if (property != null)
							bean = RequestUtils.lookup(pageContext, name, property, "session");
						else
							bean = RequestUtils.lookup(pageContext, name, "session");
					else
						bean = RequestUtils.lookup(pageContext, property, "session");
				} catch (Exception ex) {
				}
			}
			if (bean == null && this.property!=null)
				bean = pageContext.findAttribute(this.property);
	
			if (bean == null)
				return null;
	
			Collection col = (Collection) bean;
			if (col.size() == 0) {
				return null;
			}
			return col;
		}		
	}

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

	public void setName(String c) {
		this.name = c;
	}
	public String getName() {
		return this.name;
	}
	public void setMetadata(String c) {
		this.metadata=c;
	}

	private void loadSelectData() throws JspException {
		//obtiene el vector de Ddl's
		if (v == null) {
			throw new JspException("No se informaron selects");
		}
		cmbnames = new String[v.size()];
		cmbvalues = new String[v.size()];
		cmbonchange = new String[v.size()];
		for (int i = 0; i < v.size(); i++) {
			cmbnames[i] = ((Ddl) v.get(i)).getName();
			cmbvalues[i] = ((Ddl) v.get(i)).getValue();
			cmbonchange[i] = ((Ddl) v.get(i)).getOnChange();
		}
	}

	public int doStartTag() {
		this.v=new ArrayList();
		this.selectData=new HashMap();
		return (EVAL_BODY_INCLUDE);
	}

	public int doEndTag() throws JspException {
		metadataArray=null;
		this.validate();
		HttpServletRequest request = ((HttpServletRequest) pageContext.getRequest());
		Collection elementos = this.getPropertyFromContext();
		if(elementos==null)
			return EVAL_PAGE;
			
		//Determina el Id seg鷑 variables del request.
		Integer value = (Integer) ((HttpServletRequest) pageContext.getRequest()).getAttribute(ID_COMBO);
		if (value == null) {
			//es el primer tag utilizado en el request.
			id = 0;
		} else {
			id = value.intValue();
			id++;
		}
		request.setAttribute(ID_COMBO, new Integer(id));

		this.loadSelectData();
		TreeItem ddl = null;
		//Obtiene el TreeItem desde una colleccion de DynamicBeans
		try {
			if ("true".equalsIgnoreCase(this.getAddAllLabel()))
				ddl = TreeItemFactory.getInstance().createFromCollectionWithAllLabel(request, elementos, this.getMetadataArray());
			else if("true".equalsIgnoreCase(this.getAddSelectLabel()))
				ddl = TreeItemFactory.getInstance().createFromCollectionWithSelectLabel(request, elementos, this.getMetadataArray());
			else
				ddl = TreeItemFactory.getInstance().createFromCollection(request, elementos, this.getMetadataArray());
		} catch (Exception e) {
			throw new JspException("Error al obtener el arbol: " + e.toString());
		}

		StringBuffer sb = new StringBuffer("");
		sb.append(this.generateObjects());
		sb.append("<script language=\"JavaScript1.2\">\n<!--\n");
		sb.append(this.generateDeclaration());
		sb.append(this.generateTree(ddl));
		sb.append(this.generateRefillFunction());
		sb.append("refill");
		sb.append(id);
		sb.append("(-1, 0);\n");
		//limpia los valores iniciales.
		for (int i = 0; i < cmbvalues.length; i++) {
			sb.append("selvalue");
			sb.append(id);
			sb.append("[");
			sb.append(i);
			sb.append("]=\"\";\n");
		}

		sb.append("//-->\n</script>");
		//System.out.println(sb.toString());
		try {
			pageContext.getOut().write(sb.toString());
		} catch (Exception e) {
			throw new JspException("IO Error: " + e.getMessage());
		}
		return EVAL_PAGE;
	}

	private String generateDeclaration() {
		StringBuffer sb = new StringBuffer("");

		//Nombres, valores y onchange de los selects
		sb.append("var selname");
		sb.append(id);
		sb.append("=new Array(");
		sb.append(cmbnames.length);
		sb.append(");\n");

		sb.append("var selvalue");
		sb.append(id);
		sb.append("=new Array(");
		sb.append(cmbvalues.length);
		sb.append(");\n");

		for (int i = 0; i < cmbnames.length; i++) {
			sb.append("select").append(id).append(i).append("=").append(cmbnames[i]).append(";\n");
			sb.append("selname").append(id).append("[").append(i).append("]=\"").append("select").append(
				id).append(
				i).append(
				"\";\n");
			sb.append("func").append(id).append(i).append("=new Function();\n");
			sb.append("if(select").append(id).append(i).append(".onchange) {\n");
			sb.append("func").append(id).append(i).append("=select").append(id).append(i).append(
				".onchange;\n}\n");

			sb.append("function refill").append(id).append(i).append("() {\n");
			sb.append("select").append(id).append("=").append(cmbnames[i]).append(";\n");
			sb.append("\nrefill").append(id).append("(").append(i).append(", ").append("select").append(
				id).append(
				".selectedIndex); ");
			sb.append(cmbonchange[i]!=null?cmbonchange[i]:"");				
			sb.append("\nfunc").append(id).append(i).append("();\n");
			sb.append("}\n");

			sb.append("select");
			sb.append(id);
			sb.append(i);
			sb.append(".onchange=refill");
			sb.append(id);
			sb.append(i);
			sb.append(";\n");

			sb.append("selvalue");
			sb.append(id);
			sb.append("[");
			sb.append(i);
			sb.append("]=\"");
			sb.append(cmbvalues[i]);
			sb.append("\";\n");
		}

		return sb.toString();
	}

	private String generateTree(TreeItem ddl) {
		StringBuffer sb = new StringBuffer("");
		sb.append("\nvar ddl");
		sb.append(id);
		sb.append("=new TreeItem(\"ROOT\", \"ROOT\");\n");

		//Recorre el arbol de 韙ems para generar el c骴igo.
		generate(sb, ddl, "ddl" + id);

		return sb.toString();
	}

	private void generate(StringBuffer sb, TreeItem ddl, String parent) {
		Iterator it = ddl.rel.iterator();
		int i = 0;
		while (it.hasNext()) {
			TreeItem ddlaux = (TreeItem) it.next();
			String newParent = parent + "_" + i;
			sb.append(newParent);
			sb.append("=");
			sb.append(parent);
			sb.append(".add(\"");
			//MM: Reemplazo ' por " para evitar errores de JScript.
			sb.append(ddlaux.getDescrip().replace('"', '\''));
			sb.append("\", \"");
			sb.append(ddlaux.getId());
			sb.append("\");\n");
			i++;
			generate(sb, ddlaux, newParent);
		}
	}

	private String generateRefillFunction() {
		StringBuffer sb = new StringBuffer("");
		sb.append("function refill");
		sb.append(id);
		sb.append("(sel, index) { selCount=selname");
		sb.append(id);
		sb.append(".length;\n");
		sb.append("if(sel==-1) selCount-- ;\n");
		sb.append("for(selidx=sel;selidx<selCount;selidx++) {\n");
		sb.append("level=selidx+1;select=eval(selname");
		sb.append(id);
		sb.append("[level]);\nif(select) {\n");
		sb.append("saux=\"ddl");
		sb.append(id);
		sb.append("\";\n");
		sb.append("for(i=0;i<level;i++) { saux=saux + \".rel\"; if(i<level) { saux=saux + \"[\" + selname");
		sb.append(id);
		sb.append("[i] + \".selectedIndex]\";} else {saux=saux + \"[index]\";}}\n");
		sb.append("aux=eval(saux);	for (m=select.options.length-1;m>=0;m--) {select.options[m]=null;}\n");
		sb.append(
			"indice=0;\nfor (i=0;i<aux.rel.length;i++){	select.options[i]=new Option(aux.rel[i].descrip, aux.rel[i].id);\nif(selvalue");
		sb.append(id);
		sb.append("[level] == aux.rel[i].id) indice=i;\n} select.options[indice].selected=true;} }}\n");

		return sb.toString();
	}

	public String generateObjects() {
		StringBuffer sb = new StringBuffer("");
		//verifica si en el request ya no apareci