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GroovyPageOutputStack.java
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/
GroovyPageOutputStack.java
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package org.codehaus.groovy.grails.web.pages;
import java.io.Writer;
import java.util.Stack;
import org.apache.commons.io.output.NullWriter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes;
import org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest;
import org.codehaus.groovy.grails.web.util.GrailsPrintWriter;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
public final class GroovyPageOutputStack {
public static final Log log = LogFactory.getLog(GroovyPageOutputStack.class);
private static final String ATTRIBUTE_NAME_OUTPUT_STACK="org.codehaus.groovy.grails.GSP_OUTPUT_STACK";
public static GroovyPageOutputStack currentStack() {
return currentStack(true);
}
public static GroovyPageOutputStack currentStack(RequestAttributes request) {
return currentStack(request, true);
}
public static GroovyPageOutputStack currentStack(boolean allowCreate) {
return currentStack(allowCreate, null, allowCreate, false);
}
public static GroovyPageOutputStack currentStack(RequestAttributes request,boolean allowCreate) {
return currentStack(request, allowCreate, null, allowCreate, false);
}
public static GroovyPageOutputStack currentStack(boolean allowCreate, Writer topWriter, boolean autoSync, boolean pushTop) {
RequestAttributes request = RequestContextHolder.currentRequestAttributes();
return currentStack(request, allowCreate, topWriter, autoSync, pushTop);
}
public static GroovyPageOutputStack currentStack(RequestAttributes request, boolean allowCreate, Writer topWriter, boolean autoSync, boolean pushTop) {
GroovyPageOutputStack outputStack = (GroovyPageOutputStack) request.getAttribute(
ATTRIBUTE_NAME_OUTPUT_STACK, RequestAttributes.SCOPE_REQUEST);
if (outputStack != null) {
if (pushTop && topWriter != null) {
outputStack.push(topWriter);
}
return outputStack;
}
if (allowCreate) {
if (topWriter == null) {
if (request instanceof GrailsWebRequest) {
topWriter = defaultRequest((GrailsWebRequest) request);
}
}
return createNew(topWriter, autoSync);
}
return null;
}
private static GrailsWebRequest getGrailsWebRequest() {
Object requestAttributes=RequestContextHolder.currentRequestAttributes();
if (requestAttributes instanceof GrailsWebRequest) {
return (GrailsWebRequest)requestAttributes;
}
return null;
}
private static Writer defaultRequest() {
GrailsWebRequest webRequest=getGrailsWebRequest();
return defaultRequest(webRequest);
}
private static Writer defaultRequest(GrailsWebRequest webRequest) {
if (webRequest != null) {
return webRequest.getOut();
}
return null;
}
public static final GroovyPageOutputStack createNew(Writer topWriter) {
return createNew(topWriter, false);
}
private static final GroovyPageOutputStack createNew(Writer topWriter, boolean autoSync) {
GroovyPageOutputStack instance = new GroovyPageOutputStack(topWriter, autoSync);
RequestAttributes requestAttributes = RequestContextHolder.currentRequestAttributes();
requestAttributes.setAttribute(
ATTRIBUTE_NAME_OUTPUT_STACK, instance, RequestAttributes.SCOPE_REQUEST);
requestAttributes.setAttribute(GrailsApplicationAttributes.OUT, topWriter, RequestAttributes.SCOPE_REQUEST);
return instance;
}
public static final void removeCurrentInstance() {
RequestContextHolder.currentRequestAttributes().removeAttribute(
ATTRIBUTE_NAME_OUTPUT_STACK, RequestAttributes.SCOPE_REQUEST);
}
public static final Writer currentWriter() {
GroovyPageOutputStack outputStack=currentStack(false);
if (outputStack != null) {
return outputStack.getProxyWriter();
}
return defaultRequest();
}
private Stack<WriterPair> stack = new Stack<WriterPair>();
private GroovyPageProxyWriter proxyWriter;
private boolean autoSync;
private class WriterPair {
Writer originalTarget;
Writer unwrappedTarget;
WriterPair(Writer originalTarget, Writer unwrappedTarget) {
this.originalTarget = originalTarget;
this.unwrappedTarget = unwrappedTarget;
}
}
private class GroovyPageProxyWriter extends GrailsPrintWriter {
public GroovyPageProxyWriter() {
super(new NullWriter());
}
public void setOut(Writer newOut) {
out = newOut;
}
@SuppressWarnings("unused")
public GroovyPageOutputStack getOutputStack() {
return GroovyPageOutputStack.this;
}
}
private GroovyPageOutputStack(Writer topWriter, boolean autoSync) {
proxyWriter = new GroovyPageProxyWriter();
this.autoSync = autoSync;
push(topWriter);
if (!autoSync) {
applyWriterThreadLocals(proxyWriter);
}
}
private Writer unwrapTargetWriter(Writer targetWriter) {
if (targetWriter instanceof GrailsPrintWriter) {
GrailsPrintWriter gpw=((GrailsPrintWriter)targetWriter);
if (gpw.isAllowUnwrappingOut()) {
return ((GrailsPrintWriter)targetWriter).getOut();
}
}
return targetWriter;
}
public void push(final Writer newWriter) {
push(newWriter, false);
}
public void push(final Writer newWriter, final boolean checkExisting) {
if (newWriter == proxyWriter && stack.size() > 0) {
stack.push(stack.peek());
return;
}
if (checkExisting) {
for (WriterPair item : stack) {
if (item.originalTarget == newWriter) {
log.warn("Pushed a writer to stack a second time. Writer type " +
newWriter.getClass().getName(), new Exception());
}
}
}
Writer unwrappedWriter = unwrapTargetWriter(newWriter);
if (unwrappedWriter == proxyWriter && stack.size() > 0) {
stack.push(stack.peek());
return;
}
stack.push(new WriterPair(newWriter, unwrappedWriter));
proxyWriter.setOut(newWriter);
if (autoSync) {
applyWriterThreadLocals(newWriter);
}
}
public void pop() {
pop(autoSync);
}
public void pop(boolean forceSync) {
stack.pop();
if (stack.size() > 0) {
WriterPair pair = stack.peek();
proxyWriter.setOut(pair.unwrappedTarget);
if (forceSync) {
applyWriterThreadLocals(pair.originalTarget);
}
}
}
public GroovyPageProxyWriter getProxyWriter() {
return proxyWriter;
}
public Writer getCurrentOriginalWriter() {
return stack.peek().originalTarget;
}
public void restoreThreadLocalsToOriginals() {
Writer originalTopWriter = stack.firstElement().originalTarget;
applyWriterThreadLocals(originalTopWriter);
}
private void applyWriterThreadLocals(Writer writer) {
GrailsWebRequest webRequest = getGrailsWebRequest();
if (webRequest != null) {
webRequest.setOut(writer);
}
}
}