/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, 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 acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* 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 VISIGOTH SOFTWARE SOCIETY 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.ext.jsp;
import java.beans.IntrospectionException;
import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.util.Map;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTag;
import javax.servlet.jsp.tagext.IterationTag;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TryCatchFinally;
import freemarker.log.Logger;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateTransformModel;
import freemarker.template.TransformControl;
/**
* @version $Id: TagTransformModel.java,v 1.17.2.2 2006/07/08 14:45:34 ddekany Exp $
* @author Attila Szegedi
*/
class TagTransformModel extends JspTagModelBase implements TemplateTransformModel
{
private static final Logger logger = Logger.getLogger("freemarker.servlet");
private final boolean isBodyTag;
private final boolean isIterationTag;
private final boolean isTryCatchFinally;
public TagTransformModel(Class tagClass) throws IntrospectionException {
super(tagClass);
isIterationTag = IterationTag.class.isAssignableFrom(tagClass);
isBodyTag = isIterationTag && BodyTag.class.isAssignableFrom(tagClass);
isTryCatchFinally = TryCatchFinally.class.isAssignableFrom(tagClass);
}
public Writer getWriter(Writer out, Map args) throws TemplateModelException
{
try {
Tag tag = (Tag)getTagInstance();
FreeMarkerPageContext pageContext = PageContextFactory.getCurrentPageContext();
Tag parentTag = (Tag)pageContext.peekTopTag(Tag.class);
tag.setParent(parentTag);
tag.setPageContext(pageContext);
setupTag(tag, args, pageContext.getObjectWrapper());
// If the parent of this writer is not a JspWriter itself, use
// a little Writer-to-JspWriter adapter...
boolean usesAdapter;
if(out instanceof JspWriter) {
// This is just a sanity check. If it were JDK 1.4-only,
// we'd use an assert.
if(out != pageContext.getOut()) {
throw new TemplateModelException(
"out != pageContext.getOut(). Out is " +
out + " pageContext.getOut() is " +
pageContext.getOut());
}
usesAdapter = false;
}
else {
out = new JspWriterAdapter(out);
pageContext.pushWriter((JspWriter)out);
usesAdapter = true;
}
JspWriter w = new TagWriter(out, tag, pageContext, usesAdapter);
pageContext.pushTopTag(tag);
pageContext.pushWriter(w);
return w;
}
catch(TemplateModelException e) {
throw e;
}
catch(RuntimeException e) {
throw e;
}
catch(Exception e) {
throw new TemplateModelException(e);
}
}
/**
* An implementation of BodyContent that buffers it's input to a char[].
*/
static class BodyContentImpl extends BodyContent {
private CharArrayWriter buf;
BodyContentImpl(JspWriter out, boolean buffer) {
super(out);
if (buffer) initBuffer();
}
void initBuffer() {
buf = new CharArrayWriter();
}
public void flush() throws IOException {
if(buf == null) {
getEnclosingWriter().flush();
}
}
public void clear() throws IOException {
if(buf != null) {
buf = new CharArrayWriter();
}
else {
throw new IOException("Can't clear");
}
}
public void clearBuffer() throws IOException {
if(buf != null) {
buf = new CharArrayWriter();
}
else {
throw new IOException("Can't clear");
}
}
public int getRemaining() {
return Integer.MAX_VALUE;
}
public void newLine() throws IOException {
write(JspWriterAdapter.NEWLINE);
}
public void close() throws IOException {
}
public void print(boolean arg0) throws IOException {
write(arg0 ? Boolean.TRUE.toString() : Boolean.FALSE.toString());
}
public void print(char arg0) throws IOException
{
write(arg0);
}
public void print(char[] arg0) throws IOException
{
write(arg0);
}
public void print(double arg0) throws IOException
{
write(Double.toString(arg0));
}
public void print(float arg0) throws IOException
{
write(Float.toString(arg0));
}
public void print(int arg0) throws IOException
{
write(Integer.toString(arg0));
}
public void print(long arg0) throws IOException
{
write(Long.toString(arg0));
}
public void print(Object arg0) throws IOException
{
write(arg0 == null ? "null" : arg0.toString());
}
public void print(String arg0) throws IOException
{
write(arg0);
}
public void println() throws IOException
{
newLine();
}
public void println(boolean arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(char arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(char[] arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(double arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(float arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(int arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(long arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(Object arg0) throws IOException
{
print(arg0);
newLine();
}
public void println(String arg0) throws IOException
{
print(arg0);
newLine();
}
public void write(int c) throws IOException
{
if(buf != null) {
buf.write(c);
}
else {
getEnclosingWriter().write(c);
}
}
public void write(char[] cbuf, int off, int len) throws IOException
{
if(buf != null) {
buf.write(cbuf, off, len);
}
else {
getEnclosingWriter().write(cbuf, off, len);
}
}
public String getString() {
return buf.toString();
}
public Reader getReader() {
return new CharArrayReader(buf.toCharArray());
}
public void writeOut(Writer out) throws IOException {
buf.writeTo(out);
}
}
class TagWriter extends BodyContentImpl implements TransformControl
{
private final Tag tag;
private final FreeMarkerPageContext pageContext;
private boolean needPop = true;
private final boolean needDoublePop;
TagWriter(Writer out, Tag tag, FreeMarkerPageContext pageContext, boolean needDoublePop)
{
super((JspWriter)out, false);
this.needDoublePop = needDoublePop;
this.tag = tag;
this.pageContext = pageContext;
}
public String toString() {
return "TagWriter for " + tag.getClass().getName() + " wrapping a " + getEnclosingWriter().toString();
}
Tag getTag()
{
return tag;
}
FreeMarkerPageContext getPageContext()
{
return pageContext;
}
public int onStart()
throws
TemplateModelException
{
try {
int dst = tag.doStartTag();
switch(dst) {
case Tag.SKIP_BODY:
// EVAL_PAGE is illegal actually, but some taglibs out there
// use it, and it seems most JSP compilers allow them to and
// treat it identically to SKIP_BODY, so we're going with
// the flow and we allow it too, altough strictly speaking
// it is in violation of the spec.
case Tag.EVAL_PAGE: {
endEvaluation();
return TransformControl.SKIP_BODY;
}
case BodyTag.EVAL_BODY_BUFFERED: {
if(isBodyTag) {
initBuffer();
BodyTag btag = (BodyTag)tag;
btag.setBodyContent(this);
btag.doInitBody();
}
else {
throw new TemplateModelException("Can't buffer body since " + tag.getClass().getName() + " does not implement BodyTag.");
}
// Intentional fall-through
}
case Tag.EVAL_BODY_INCLUDE: {
return TransformControl.EVALUATE_BODY;
}
default: {
throw new RuntimeException("Illegal return value " + dst + " from " + tag.getClass().getName() + ".doStartTag()");
}
}
}
catch(JspException e) {
throw new TemplateModelException(e.getMessage(), e);
}
}
public int afterBody()
throws
TemplateModelException
{
try {
if(isIterationTag) {
int dab = ((IterationTag)tag).doAfterBody();
switch(dab) {
case Tag.SKIP_BODY: {
endEvaluation();
return END_EVALUATION;
}
case IterationTag.EVAL_BODY_AGAIN: {
return REPEAT_EVALUATION;
}
default: {
throw new TemplateModelException("Unexpected return value " + dab + "from " + tag.getClass().getName() + ".doAfterBody()");
}
}
}
endEvaluation();
return END_EVALUATION;
}
catch(JspException e) {
throw new TemplateModelException(e);
}
}
private void endEvaluation() throws JspException {
if(needPop) {
pageContext.popWriter();
needPop = false;
}
if(tag.doEndTag() == Tag.SKIP_PAGE) {
logger.warn("Tag.SKIP_PAGE was ignored from a " + tag.getClass().getName() + " tag.");
}
}
public void onError(Throwable t) throws Throwable {
if(isTryCatchFinally) {
((TryCatchFinally)tag).doCatch(t);
}
else {
throw t;
}
}
public void close() {
if(needPop) {
pageContext.popWriter();
}
pageContext.popTopTag();
try {
if(isTryCatchFinally) {
((TryCatchFinally)tag).doFinally();
}
// No pooling yet
tag.release();
}
finally {
if(needDoublePop) {
pageContext.popWriter();
}
}
}
}
}
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