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/*
* $Id$
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 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 end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``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 THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, 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.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.render.rtf;
import java.util.Stack;
import org.apache.fop.render.rtf.rtflib.rtfdoc.IRtfOptions;
import org.apache.fop.render.rtf.rtflib.rtfdoc.RtfContainer;
/** A BuilderContext holds context information when building an RTF document
*
* @author Bertrand Delacretaz <bdelacretaz@codeconsult.ch>
* @author putzi
* @author Peter Herweg <pherweg@web.de>
*
* This class was originally developed by Bertrand Delacretaz bdelacretaz@codeconsult.ch
* for the JFOR project and is now integrated into FOP.
*/
class BuilderContext {
/** stack of RtfContainers */
private final Stack m_containers = new Stack();
/** stack of TableContexts */
private final Stack m_tableContexts = new Stack();
/** stack of IBuilders */
private final Stack m_builders = new Stack();
/** Rtf options */
IRtfOptions m_options;
BuilderContext(IRtfOptions rtfOptions) {
m_options = rtfOptions;
}
/** find first object of given class from top of stack s
* @return null if not found
*/
private Object getObjectFromStack(Stack s, Class desiredClass) {
Object result = null;
final Stack copy = (Stack)s.clone();
while (!copy.isEmpty()) {
final Object o = copy.pop();
if (desiredClass.isAssignableFrom(o.getClass())) {
result = o;
break;
}
}
return result;
}
/* find the "nearest" IBuilder of given class /
Object getBuilder(Class builderClass,boolean required)
throws Exception
{
final IBuilder result = (IBuilder)getObjectFromStack(m_builders,builderClass);
if(result == null && required) {
throw new Exception(
"IBuilder of class '" + builderClass.getName() + "' not found on builders stack"
);
}
return result;
}*/
/** find the "nearest" container that implements the given interface on our stack
* @param required if true, ConverterException is thrown if no container found
* @param forWhichBuilder used in error message if container not found
*/
RtfContainer getContainer(Class containerClass, boolean required,
Object /*IBuilder*/ forWhichBuilder) throws Exception {
// TODO what to do if the desired container is not at the top of the stack?
// close top-of-stack container?
final RtfContainer result = (RtfContainer)getObjectFromStack(m_containers,
containerClass);
if (result == null && required) {
throw new Exception(
"No RtfContainer of class '" + containerClass.getName()
+ "' available for '" + forWhichBuilder.getClass().getName() + "' builder"
);
}
return result;
}
/** push an RtfContainer on our stack */
void pushContainer(RtfContainer c) {
m_containers.push(c);
}
/**
* In some cases an RtfContainer must be replaced by another one on the
* stack. This happens when handling nested fo:blocks for example: after
* handling a nested block the enclosing block must switch to a new
* paragraph container to handle what follows the nested block.
* TODO: what happens to elements that are "more on top" than oldC on the
* stack? shouldn't they be closed or something?
*/
void replaceContainer(RtfContainer oldC, RtfContainer newC)
throws Exception {
// treating the Stack as a Vector allows such manipulations (yes, I hear you screaming ;-)
final int index = m_containers.indexOf(oldC);
if (index < 0) {
throw new Exception("container to replace not found:" + oldC);
}
m_containers.setElementAt(newC, index);
}
/** pop the topmost RtfContainer from our stack */
void popContainer() {
m_containers.pop();
}
/* push an IBuilder to our stack /
void pushBuilder(IBuilder b)
{
m_builders.push(b);
}*/
/** pop the topmost IBuilder from our stack and return previous builder on stack
* @return null if builders stack is empty
IBuilder popBuilderAndGetPreviousOne()
{
IBuilder result = null;
m_builders.pop();
if(!m_builders.isEmpty()) {
result = (IBuilder)m_builders.peek();
}
return result;
}
*/
/** return the current TableContext */
TableContext getTableContext() {
return (TableContext)m_tableContexts.peek();
}
/** push a TableContext to our stack */
void pushTableContext(TableContext tc) {
m_tableContexts.push(tc);
}
/** pop a TableContext from our stack */
void popTableContext() {
m_tableContexts.pop();
}
}
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