package cambridge.behaviors;
import cambridge.BehaviorInstantiationException;
import cambridge.BehaviorProvider;
import cambridge.ExpressionEvaluationException;
import cambridge.ExpressionParsingException;
import cambridge.Expressions;
import cambridge.LoopingTagBehavior;
import cambridge.TemplateEvaluationException;
import cambridge.model.Attribute;
import cambridge.model.AttributeKey;
import cambridge.model.DynamicAttribute;
import cambridge.model.Expression;
import cambridge.model.TagNode;
import cambridge.runtime.Iter;
import java.io.IOException;
import java.io.Writer;
import java.util.Map;
/**
* User: erdinc
* Date: Nov 1, 2009
* Time: 2:36:22 PM
*/
public class WhileBehavior extends LoopingTagBehavior {
private final Expression expression;
public WhileBehavior(Expression expression, int line, int col) {
super(line, col);
this.expression = expression;
}
@Override
public void doExecute(Map<String, Object> bindings, TagNode tag, Writer out) throws TemplateEvaluationException, IOException {
try {
Iter iter = new Iter();
while (expression.asBoolean(bindings)) {
bindings.put(Expressions.ITER_OBJECT, iter);
tag.execute(bindings, out);
iter.next();
}
} catch (ExpressionEvaluationException e) {
throw new TemplateEvaluationException(e, "Could not execute the expression: " +
e.getMessage() + ", on line: " + tag.getBeginLine() + ", column: " +
tag.getBeginColumn(), tag.getBeginLine(), tag.getBeginColumn(), tag.getTagName());
}
}
public static BehaviorProvider<WhileBehavior> getProvider() {
return new BehaviorProvider<WhileBehavior>() {
public WhileBehavior get(DynamicAttribute keyAttribute, Map<AttributeKey, Attribute> attributes, int line, int col) throws ExpressionParsingException, BehaviorInstantiationException {
return new WhileBehavior(keyAttribute.getExpression(), line, col);
}
};
}
}