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package com.sun.faces.facelets.tag.jstl.core;
import com.sun.faces.facelets.tag.TagHandlerImpl;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.*;
import java.io.IOException;
import java.util.Iterator;
/**
* Simplified implementation of c:set
*
* @author Jacob Hookom
* @version $Id$
*/
public class SetHandler extends TagHandlerImpl {
private final TagAttribute var;
private final TagAttribute value;
private final TagAttribute target;
private final TagAttribute property;
private final TagAttribute scope;
public SetHandler(TagConfig config) {
super(config);
this.value = this.getAttribute("value");
this.var = this.getAttribute("var");
this.target = this.getAttribute("target");
this.property = this.getAttribute("property");
this.scope = this.getAttribute("scope");
}
@Override
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException {
StringBuilder bodyValue = new StringBuilder();
Iterator iter = TagHandlerImpl.findNextByType(this.nextHandler,
TextHandler.class);
while (iter.hasNext()) {
TextHandler text = (TextHandler) iter.next();
bodyValue.append(text.getText(ctx));
}
// true if either a value in body or value attr
boolean valSet = bodyValue.length() > 0 || (value != null && value.getValue().length() >0);
// Apply precedence algorithm for attributes. The JstlCoreTLV doesn't
// seem to enforce much in the way of this, so I edburns needs to check
// with an authority on the matter, probabyl Kin-Man Chung
ValueExpression veObj;
ValueExpression lhs;
String expr;
if (this.value != null) {
veObj = this.value.getValueExpression(ctx, Object.class);
} else {
veObj = ctx.getExpressionFactory().createValueExpression(
ctx.getFacesContext().getELContext(),bodyValue.toString(),Object.class);
}
// Otherwise, if var is set, ignore the other attributes
if (this.var != null) {
String scopeStr, varStr = this.var.getValue(ctx);
// If scope is set, check for validity
if (null != this.scope) {
if (0 == this.scope.getValue().length()) {
throw new TagException(tag, "zero length scope attribute set");
}
if (this.scope.isLiteral()) {
scopeStr = this.scope.getValue();
} else {
scopeStr = this.scope.getValue(ctx);
}
if (scopeStr.equals("page")) {
throw new TagException(tag, "page scope does not exist in JSF, consider using view scope instead.");
}
if (scopeStr.equals("request") || scopeStr.equals("session") ||
scopeStr.equals("application") || scopeStr.equals("view")) {
scopeStr = scopeStr + "Scope";
}
// otherwise, assume it's a valid scope. With custom scopes,
// it may be.
// Conjure up an expression
expr = "#{" + scopeStr +"." + varStr + "}";
lhs = ctx.getExpressionFactory().
createValueExpression(ctx, expr, Object.class);
lhs.setValue(ctx, veObj.getValue(ctx));
}
else {
ctx.getVariableMapper().setVariable(varStr, veObj);
}
} else {
// Otherwise, target, property and value must be set
if ((null == this.target || null == this.target.getValue() ||
this.target.getValue().length() <= 0) ||
(null == this.property || null == this.property.getValue() ||
this.property.getValue().length() <= 0) || !valSet) {
throw new TagException(tag, "when using this tag either one of var and value, or (target, property, value) must be set.");
}
// Ensure that target is an expression
if (this.target.isLiteral()) {
throw new TagException(tag, "value of target attribute must be an expression");
}
// Get the value of property
String propertyStr = null;
if (this.property.isLiteral()) {
propertyStr = this.property.getValue();
} else {
propertyStr = this.property.getValue(ctx);
}
ValueExpression targetVe = this.target.getValueExpression(ctx, Object.class);
Object targetValue = targetVe.getValue(ctx);
ctx.getFacesContext().getELContext().getELResolver().setValue(ctx,
targetValue, propertyStr, veObj.getValue(ctx));
}
}
// Swallow children - if they're text, we've already handled them.
protected void applyNextHandler(FaceletContext ctx, UIComponent c) {
}
}