Examples with IteratorAdapter org.apache.struts.util.IteratorAdapter used on opensource projects

Example 1 with IteratorAdapter

use of org.apache.struts.util.IteratorAdapter in project sonarqube by SonarSource.

the class OptionsTag method getIterator.

/**
     * Return an iterator for the option labels or values, based on our
     * configured properties.
     *
     * @param name     Name of the bean attribute (if any)
     * @param property Name of the bean property (if any)
     * @throws JspException if an error occurs
     */
protected Iterator getIterator(String name, String property) throws JspException {
    // Identify the bean containing our collection
    String beanName = name;
    if (beanName == null) {
        beanName = Constants.BEAN_KEY;
    }
    Object bean = TagUtils.getInstance().lookup(pageContext, beanName, null);
    if (bean == null) {
        throw new JspException(messages.getMessage("getter.bean", beanName));
    }
    // Identify the collection itself
    Object collection = bean;
    if (property != null) {
        try {
            collection = PropertyUtils.getProperty(bean, property);
            if (collection == null) {
                throw new JspException(messages.getMessage("getter.property", property));
            }
        } catch (IllegalAccessException e) {
            throw new JspException(messages.getMessage("getter.access", property, name));
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            throw new JspException(messages.getMessage("getter.result", property, t.toString()));
        } catch (NoSuchMethodException e) {
            throw new JspException(messages.getMessage("getter.method", property, name));
        }
    }
    // Construct and return an appropriate iterator
    if (collection.getClass().isArray()) {
        collection = Arrays.asList((Object[]) collection);
    }
    if (collection instanceof Collection) {
        return (((Collection) collection).iterator());
    } else if (collection instanceof Iterator) {
        return ((Iterator) collection);
    } else if (collection instanceof Map) {
        return (((Map) collection).entrySet().iterator());
    } else if (collection instanceof Enumeration) {
        return new IteratorAdapter((Enumeration) collection);
    } else {
        throw new JspException(messages.getMessage("optionsTag.iterator", collection.toString()));
    }
}

Example 2 with IteratorAdapter

use of org.apache.struts.util.IteratorAdapter in project sonarqube by SonarSource.

the class IterateTag method doStartTag.

// --------------------------------------------------------- Public Methods
/**
     * Construct an iterator for the specified collection, and begin looping
     * through the body once per element.
     *
     * @throws JspException if a JSP exception has occurred
     */
public int doStartTag() throws JspException {
    // Acquire the collection we are going to iterate over
    Object collection = this.collection;
    if (collection == null) {
        collection = TagUtils.getInstance().lookup(pageContext, name, property, scope);
    }
    if (collection == null) {
        JspException e = new JspException(messages.getMessage("iterate.collection"));
        TagUtils.getInstance().saveException(pageContext, e);
        throw e;
    }
    // Construct an iterator for this collection
    if (collection.getClass().isArray()) {
        try {
            // If we're lucky, it is an array of objects
            // that we can iterate over with no copying
            iterator = Arrays.asList((Object[]) collection).iterator();
        } catch (ClassCastException e) {
            // Rats -- it is an array of primitives
            int length = Array.getLength(collection);
            ArrayList c = new ArrayList(length);
            for (int i = 0; i < length; i++) {
                c.add(Array.get(collection, i));
            }
            iterator = c.iterator();
        }
    } else if (collection instanceof Collection) {
        iterator = ((Collection) collection).iterator();
    } else if (collection instanceof Iterator) {
        iterator = (Iterator) collection;
    } else if (collection instanceof Map) {
        iterator = ((Map) collection).entrySet().iterator();
    } else if (collection instanceof Enumeration) {
        iterator = new IteratorAdapter((Enumeration) collection);
    } else {
        JspException e = new JspException(messages.getMessage("iterate.iterator"));
        TagUtils.getInstance().saveException(pageContext, e);
        throw e;
    }
    // Calculate the starting offset
    if (offset == null) {
        offsetValue = 0;
    } else {
        try {
            offsetValue = Integer.parseInt(offset);
        } catch (NumberFormatException e) {
            Integer offsetObject = (Integer) TagUtils.getInstance().lookup(pageContext, offset, null);
            if (offsetObject == null) {
                offsetValue = 0;
            } else {
                offsetValue = offsetObject.intValue();
            }
        }
    }
    if (offsetValue < 0) {
        offsetValue = 0;
    }
    // Calculate the rendering length
    if (length == null) {
        lengthValue = 0;
    } else {
        try {
            lengthValue = Integer.parseInt(length);
        } catch (NumberFormatException e) {
            Integer lengthObject = (Integer) TagUtils.getInstance().lookup(pageContext, length, null);
            if (lengthObject == null) {
                lengthValue = 0;
            } else {
                lengthValue = lengthObject.intValue();
            }
        }
    }
    if (lengthValue < 0) {
        lengthValue = 0;
    }
    lengthCount = 0;
    // Skip the leading elements up to the starting offset
    for (int i = 0; i < offsetValue; i++) {
        if (iterator.hasNext()) {
            iterator.next();
        }
    }
    // Store the first value and evaluate, or skip the body if none
    if (iterator.hasNext()) {
        Object element = iterator.next();
        if (element == null) {
            pageContext.removeAttribute(id);
        } else {
            pageContext.setAttribute(id, element);
        }
        lengthCount++;
        started = true;
        if (indexId != null) {
            pageContext.setAttribute(indexId, new Integer(getIndex()));
        }
        return (EVAL_BODY_TAG);
    } else {
        return (SKIP_BODY);
    }
}