Examples of org.apache.commons.collections.ArrayStack

org.apache.commons.collections.ArrayStack
An implementation of the {@link java.util.Stack} API that is based on anArrayList instead of a Vector, so it is not synchronized to protect against multi-threaded access. The implementation is therefore operates faster in environments where you do not need to worry about multiple thread contention. @author Craig R. McClanahan @version $Revision: 1.3 $ $Date: 2001/05/04 16:33:18 $ @see java.util.Stack

     *
     * @since 1.6
     */
    public Object pop(String stackName) {
        Object result = null;
        ArrayStack namedStack = (ArrayStack) stacksByName.get(stackName);
        if (namedStack == null) {
            if (log.isDebugEnabled()) {
                log.debug("Stack '" + stackName + "' is empty");
            }
            throw new EmptyStackException();
            
        } else {
        
            result = namedStack.pop();
        }
        return result;
    }

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     *
     * @since 1.6
     */
    public Object peek(String stackName, int n) {
        Object result = null;
        ArrayStack namedStack = (ArrayStack) stacksByName.get(stackName);
        if (namedStack == null ) {
            if (log.isDebugEnabled()) {
                log.debug("Stack '" + stackName + "' is empty");
            }        
            throw new EmptyStackException();
        
        } else {
        
            result = namedStack.peek(n);
        }
        return result;
    }

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     *
     * @since 1.6
     */
    public boolean isEmpty(String stackName) {
        boolean result = true;
        ArrayStack namedStack = (ArrayStack) stacksByName.get(stackName);
        if (namedStack != null ) {
            result = namedStack.isEmpty();
        }
        return result;
    }

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        if (attributeName == null && !fromStack) {
            // We must wait to set the parameter until end
            // so that we can make sure that the right set of parameters
            // is at the top of the stack
            if (bodyTextStack == null) {
                bodyTextStack = new ArrayStack();
            }
            bodyTextStack.push(bodyText.trim());
        }


    }

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    public void begin(String namespace, String name, Attributes attributes) throws Exception {
        
        if (ignoreCreateExceptions) {
        
            if (exceptionIgnoredStack == null) {
                exceptionIgnoredStack = new ArrayStack();
            }
            
            try {
                Object instance = getFactory(attributes).createObject(attributes);

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    boolean inElement = false;
    boolean prologWritten = false;
    
    public XmlWriter(final Writer writer) {
        this.writer = writer;
        this.elementNames = new ArrayStack();
    }

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     * go dynamically as the document is parsed.
     *
     * @param prefix Prefix to look up
     */
    public String findNamespaceURI(String prefix) {
        ArrayStack stack = (ArrayStack) namespaces.get(prefix);
        if (stack == null) {
            return (null);
        }
        try {
            return ((String) stack.peek());
        }
        catch (EmptyStackException e) {
            return (null);
        }
    }

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     * @exception SAXException if a parsing error is to be reported
     */
    public void startPrefixMapping(String prefix, String namespaceURI)
        throws SAXException {
        // Register this prefix mapping
        ArrayStack stack = (ArrayStack) namespaces.get(prefix);
        if (stack == null) {
            stack = new ArrayStack();
            namespaces.put(prefix, stack);
        }
        stack.push(namespaceURI);


        if ( elementNamespaces == null ) {
            elementNamespaces = new HashMap();
        }
        elementNamespaces.put(prefix, namespaceURI);

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     *
     * @exception SAXException if a parsing error is to be reported
     */
    public void endPrefixMapping(String prefix) throws SAXException {
        // Deregister this prefix mapping
        ArrayStack stack = (ArrayStack) namespaces.get(prefix);
        if (stack == null) {
            return;
        }
        try {
            stack.pop();
            if (stack.empty()) {
                namespaces.remove(prefix);
            }
        }
        catch (EmptyStackException e) {
            throw createSAXException("endPrefixMapping popped too many times");

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    protected Buffer decorateBuffer(Buffer buffer, Predicate predicate) {
        return PredicatedBuffer.decorate(buffer, predicate);
    }
    
    public Collection makeCollection() {
        return decorateBuffer(new ArrayStack(), truePredicate);
    }

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