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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
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 containers = new Stack();
/** stack of TableContexts */
private final Stack tableContexts = new Stack();
/** stack of IBuilders */
private final Stack builders = new Stack();
/** Rtf options */
private IRtfOptions options;
BuilderContext(IRtfOptions rtfOptions) {
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(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(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) {
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 = containers.indexOf(oldC);
if (index < 0) {
throw new Exception("container to replace not found:" + oldC);
}
containers.setElementAt(newC, index);
}
/** pop the topmost RtfContainer from our stack */
void popContainer() {
containers.pop();
}
/* push an IBuilder to our stack /
void pushBuilder(IBuilder b)
{
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;
builders.pop();
if(!builders.isEmpty()) {
result = (IBuilder)builders.peek();
}
return result;
}
*/
/** return the current TableContext */
TableContext getTableContext() {
return (TableContext)tableContexts.peek();
}
/** push a TableContext to our stack */
void pushTableContext(TableContext tc) {
tableContexts.push(tc);
}
/** pop a TableContext from our stack */
void popTableContext() {
tableContexts.pop();
}
}
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