org.dom4j.io.ElementStack Maven / Gradle / Ivy
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/*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*
* This software is open source.
* See the bottom of this file for the licence.
*/
package org.dom4j.io;
import org.dom4j.Element;
import org.dom4j.ElementHandler;
import org.dom4j.ElementPath;
/**
*
* ElementStack is used internally inside the {@link
* SAXContentHandler} to maintain a stack of {@link Element}instances. It opens
* an integration possibility allowing derivations to prune the tree when a node
* is complete.
*
*
* @author James Strachan
* @version $Revision: 1.14 $
*/
class ElementStack implements ElementPath {
/** stack of Element objects */
protected Element[] stack;
/** index of the item at the top of the stack or -1 if the stack is empty */
protected int lastElementIndex = -1;
private DispatchHandler handler = null;
public ElementStack() {
this(50);
}
public ElementStack(int defaultCapacity) {
stack = new Element[defaultCapacity];
}
public void setDispatchHandler(DispatchHandler dispatchHandler) {
this.handler = dispatchHandler;
}
public DispatchHandler getDispatchHandler() {
return this.handler;
}
/**
* Peeks at the top element on the stack without changing the contents of
* the stack.
*/
public void clear() {
lastElementIndex = -1;
}
/**
* Peeks at the top element on the stack without changing the contents of
* the stack.
*
* @return the current element on the stack
*/
public Element peekElement() {
if (lastElementIndex < 0) {
return null;
}
return stack[lastElementIndex];
}
/**
* Pops the element off the stack
*
* @return the element that has just been popped off the stack
*/
public Element popElement() {
if (lastElementIndex < 0) {
return null;
}
return stack[lastElementIndex--];
}
/**
* Pushes a new element onto the stack
*
* @param element
* DOCUMENT ME!
*/
public void pushElement(Element element) {
int length = stack.length;
if (++lastElementIndex >= length) {
reallocate(length * 2);
}
stack[lastElementIndex] = element;
}
/**
* Reallocates the stack to the given size
*
* @param size
* DOCUMENT ME!
*/
protected void reallocate(int size) {
Element[] oldStack = stack;
stack = new Element[size];
System.arraycopy(oldStack, 0, stack, 0, oldStack.length);
}
// The ElementPath Interface
//
public int size() {
return lastElementIndex + 1;
}
public Element getElement(int depth) {
Element element;
try {
element = (Element) stack[depth];
} catch (ArrayIndexOutOfBoundsException e) {
element = null;
}
return element;
}
public String getPath() {
if (handler == null) {
setDispatchHandler(new DispatchHandler());
}
return handler.getPath();
}
public Element getCurrent() {
return peekElement();
}
public void addHandler(String path, ElementHandler elementHandler) {
this.handler.addHandler(getHandlerPath(path), elementHandler);
}
public void removeHandler(String path) {
this.handler.removeHandler(getHandlerPath(path));
}
/**
* DOCUMENT ME!
*
* @param path
* DOCUMENT ME!
*
* @return true when an ElementHandler is registered for the
* specified path.
*/
public boolean containsHandler(String path) {
return this.handler.containsHandler(path);
}
private String getHandlerPath(String path) {
String handlerPath;
if (this.handler == null) {
setDispatchHandler(new DispatchHandler());
}
if (path.startsWith("/")) {
handlerPath = path;
} else if (getPath().equals("/")) {
handlerPath = getPath() + path;
} else {
handlerPath = getPath() + "/" + path;
}
return handlerPath;
}
}
/*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and
* notices. Redistributions must also contain a copy of this document.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name "DOM4J" must not be used to endorse or promote products derived
* from this Software without prior written permission of MetaStuff, Ltd. For
* written permission, please contact [email protected].
*
* 4. Products derived from this Software may not be called "DOM4J" nor may
* "DOM4J" appear in their names without prior written permission of MetaStuff,
* Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
*
* 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
*
* THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*/