org.atmosphere.gwt.server.impl.IFrameResponseWriter Maven / Gradle / Ivy
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
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package org.atmosphere.gwt.server.impl;
import com.google.gwt.rpc.server.ClientOracle;
import com.google.gwt.user.server.rpc.SerializationPolicy;
import java.io.IOException;
import java.io.Serializable;
import java.util.List;
/**
*
* @author p.havelaar
*/
public class IFrameResponseWriter extends ManagedStreamResponseWriter {
public IFrameResponseWriter(GwtAtmosphereResourceImpl resource, SerializationPolicy serializationPolicy, ClientOracle clientOracle) {
super(resource, serializationPolicy, clientOracle);
}
// IE requires padding to start processing the page.
private static final int PADDING_REQUIRED = 256;
private static final String HEAD = "";
private static final String PADDING_STRING;
static {
// the required padding minus the length of the heading
int capacity = PADDING_REQUIRED - HEAD.length() - MID.length() - TAIL.length();
char[] padding = new char[capacity];
for (int i = 0; i < capacity; i++) {
padding[i] = ' ';
}
PADDING_STRING = new String(padding);
}
@Override
public void initiate() throws IOException {
getResponse().setContentType("text/html");
String origin = getRequest().getHeader("Origin");
if (origin != null) {
if (logger.isDebugEnabled()) {
logger.debug("Origin: " + origin);
}
getResponse().setHeader("Access-Control-Allow-Origin", origin);
}
super.initiate();
writer.append(HEAD);
String domain = getRequest().getParameter("d");
if (domain != null) {
writer.append("document.domain='");
writer.append(domain);
writer.append("';");
}
writer.append(MID);
writer.append(Integer.toString(resource.getHeartBeatInterval()));
writer.append(',').append(String.valueOf(connectionID));
writer.append(TAIL);
}
@Override
protected int getPaddingRequired() {
return PADDING_REQUIRED;
}
@Override
protected CharSequence getPadding(int padding) {
if (padding > PADDING_STRING.length()) {
StringBuilder result = new StringBuilder(padding);
for (int i = 0; i < padding; i++) {
result.append(' ');
}
return result;
}
else {
return PADDING_STRING.substring(0, padding);
}
}
@Override
protected void doSendError(int statusCode, String message) throws IOException {
getResponse().setContentType("text/html");
writer.append("");
}
@Override
protected void doWrite(List messages) throws IOException {
writer.append("");
}
@Override
protected void doHeartbeat() throws IOException {
writer.append("");
}
@Override
protected void doTerminate() throws IOException {
writer.append("");
}
@Override
protected void doRefresh() throws IOException {
writer.append("");
}
@Override
protected boolean isOverRefreshLength(int written) {
if (length != null) {
return written > length;
}
else {
return written > 4 * 1024 * 1024;
}
}
private static CharSequence escapeString(CharSequence string) {
int length = (string != null) ? string.length() : 0;
int i = 0;
loop: while (i < length) {
char ch = string.charAt(i);
switch (ch) {
case '\'':
case '\\':
case '/':
case '\b':
case '\f':
case '\n':
case '\r':
break loop;
}
i++;
}
if (i == length)
return string;
StringBuilder str = new StringBuilder(string.length() * 2);
str.append(string, 0, i);
while (i < length) {
char ch = string.charAt(i);
switch (ch) {
case '\'':
str.append("\\\'");
break;
case '\\':
str.append("\\\\");
break;
case '/':
str.append("\\/");
break;
case '\b':
str.append("\\b");
break;
case '\f':
str.append("\\f");
break;
case '\n':
str.append("\\n");
break;
case '\r':
str.append("\\r");
break;
case '\t':
str.append("\\t");
break;
default:
str.append(ch);
}
i++;
}
return str;
}
private static CharSequence escapeObject(CharSequence string) {
int length = (string != null) ? string.length() : 0;
int i = 0;
loop: while (i < length) {
char ch = string.charAt(i);
switch (ch) {
case '\'':
case '\\':
case '/':
break loop;
}
i++;
}
if (i == length)
return string;
StringBuilder str = new StringBuilder(string.length() * 2);
str.append(string, 0, i);
while (i < length) {
char ch = string.charAt(i);
switch (ch) {
case '\'':
str.append("\\\'");
break;
case '\\':
str.append("\\\\");
break;
case '/':
str.append("\\/");
break;
default:
str.append(ch);
}
i++;
}
return str;
}
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