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DoubleValueTag.javaAPI DocExample3398Thu Jun 28 16:14:16 BST 2001com.ora.jsp.tags.sql.value

DoubleValueTag

public class DoubleValueTag extends ValueTag
This class is a custom action intended to be used in the body of a sqlQuery or an sqlUpdate action element. It adds the specified value to its parent's value list.
author
Hans Bergsten, Gefion software
version
1.0.1

Fields Summary
private double
value
Constructors Summary
Methods Summary
public intdoEndTag()
Gets the value, specified by the value attribute, the stringValue attribute, the param attribute, or the name and property attributes, and adds it to the parent's value list. If the value is a String and a pattern attribute is specified, the String is converted into the appropriate type before being added to the parent's value list.

        if (stringValue != null) {
            value = toDouble(stringValue, pattern);
        }
        else if (param != null) {
            String paramValue = getParameter(param);
            value = toDouble(paramValue, pattern);
        }
        else if (name != null) {
            value = getDouble(name, property, pattern);
        }
        ValueTagParent parent = 
            (ValueTagParent) findAncestorWithClass(this, ValueTagParent.class);
        if (parent == null) {
            throw new JspException("The sqlDoubleValue action is not " +
                "enclosed by a supported action type");
        }
        parent.addValue(new DoubleValue(value));
        return EVAL_PAGE;
private doublegetDouble(java.lang.String beanName, java.lang.String propertyName, java.lang.String pattern)

        double doubleValue;
        Object bean = getBean(beanName);
        Method readMethod = getPropertyReadMethod(bean, propertyName);
        Class returnType = readMethod.getReturnType();
        Object value = getValue(bean, readMethod, propertyName);
        
        if (Double.TYPE.isAssignableFrom(returnType)) {
            doubleValue = ((Double) value).doubleValue();
        }
        else if (String.class.isAssignableFrom(returnType)) {
            doubleValue = toDouble((String) value, pattern);
        }
        else {
            throw new JspException("Read method for the " + propertyName +
                " property in the bean named " + beanName + " is not of type " +
                " String or double");
        }
        return doubleValue;
public voidsetValue(double value)
Sets the value property.

        this.value = value;
private doubletoDouble(java.lang.String stringValue, java.lang.String pattern)

        double doubleValue;
        try {
            Number number = StringFormat.toNumber(stringValue, pattern);
            doubleValue = number.doubleValue();
        }
        catch (ParseException e) {
            throw new JspException(stringValue + " can not be converted to " +
                " a double using pattern: " + pattern + ". Message: " +
                e.getMessage());
        }
        return doubleValue;