org.picocontainer.web.remoting.RubyWriter Maven / Gradle / Ivy
package org.picocontainer.web.remoting;
import java.io.Writer;
import java.util.Collection;
import java.util.Map;
import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.core.util.FastStack;
import com.thoughtworks.xstream.core.util.Primitives;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.ExtendedHierarchicalStreamWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
public class RubyWriter implements ExtendedHierarchicalStreamWriter {
public static final int DROP_ROOT_MODE = 1;
public static final int STRICT_MODE = 2;
private final QuickWriter writer;
private final FastStack elementStack = new FastStack(16);
private final char[] lineIndenter;
private int depth;
private boolean readyForNewLine;
private boolean tagIsEmpty;
private final String newLine;
private int mode;
public RubyWriter(Writer out) {
this.writer = new QuickWriter(out);
this.newLine = "\n";
this.lineIndenter = new char[]{' ', ' '};
mode = DROP_ROOT_MODE;
}
public void startNode(String name) {
startNode(name, null);
}
@SuppressWarnings("unchecked")
public void startNode(String name, Class clazz) {
Node currNode = (Node) elementStack.peek();
if (currNode == null
&& ((mode & DROP_ROOT_MODE) == 0 || (depth > 0 && !isCollection(clazz)))) {
writer.write("{");
}
if (currNode != null && currNode.fieldAlready) {
writer.write(",");
readyForNewLine = true;
}
tagIsEmpty = false;
finishTag();
if (currNode == null
|| currNode.clazz == null
|| (currNode.clazz != null && !currNode.isCollection)) {
if (currNode != null && !currNode.fieldAlready) {
writer.write("{");
readyForNewLine = true;
finishTag();
}
if ((mode & DROP_ROOT_MODE) == 0 || depth > 0) {
writer.write(":");
writer.write(name);
writer.write(" => ");
}
}
if (isCollection(clazz)) {
writer.write("[");
readyForNewLine = true;
}
if (currNode != null) {
currNode.fieldAlready = true;
}
elementStack.push(new Node(name, clazz));
depth++;
tagIsEmpty = true;
}
public class Node {
public final String name;
public final Class clazz;
public boolean fieldAlready;
public boolean isCollection;
public Node(String name, Class clazz) {
this.name = name;
this.clazz = clazz;
isCollection = isCollection(clazz);
}
}
public void setValue(String text) {
Node currNode = (Node) elementStack.peek();
if (currNode != null && currNode.fieldAlready) {
startNode("$", String.class);
tagIsEmpty = false;
writeText(text, String.class);
endNode();
} else {
if ((mode & (DROP_ROOT_MODE | STRICT_MODE)) == (DROP_ROOT_MODE | STRICT_MODE)
&& depth == 1) {
throw new ConversionException("Single value cannot be JSON/Ruby?? root element");
}
readyForNewLine = false;
tagIsEmpty = false;
finishTag();
writeText(writer, text);
}
}
public void addAttribute(String key, String value) {
Node currNode = (Node) elementStack.peek();
if (currNode == null || !currNode.isCollection) {
startNode('@' + key, String.class);
tagIsEmpty = false;
writeText(value, String.class);
endNode();
}
}
protected void writeAttributeValue(QuickWriter writer, String text) {
writeText(text, null);
}
protected void writeText(QuickWriter writer, String text) {
Node foo = (Node) elementStack.peek();
writeText(text, foo.clazz);
}
private void writeText(String text, Class clazz) {
if (needsQuotes(clazz)) {
writer.write("\"");
}
if ((clazz == Character.class || clazz == Character.TYPE) && "".equals(text)) {
text = "\0";
}
int length = text.length();
for (int i = 0; i < length; i++) {
char c = text.charAt(i);
switch (c) {
case '"':
this.writer.write("\\\"");
break;
case '\\':
this.writer.write("\\\\");
break;
default:
if (c > 0x1f) {
this.writer.write(c);
} else {
this.writer.write("\\u");
String hex = "000" + Integer.toHexString(c);
this.writer.write(hex.substring(hex.length() - 4));
}
}
}
if (needsQuotes(clazz)) {
writer.write("\"");
}
}
private boolean isCollection(Class clazz) {
return clazz != null
&& (Collection.class.isAssignableFrom(clazz)
|| clazz.isArray()
|| Map.class.isAssignableFrom(clazz) || Map.Entry.class.isAssignableFrom(clazz));
}
private boolean needsQuotes(Class clazz) {
clazz = clazz != null && clazz.isPrimitive() ? clazz : Primitives.unbox(clazz);
return clazz == null || clazz == Character.TYPE;
}
public void endNode() {
depth--;
Node node = (Node) elementStack.pop();
if (node.clazz != null && node.isCollection) {
if (node.fieldAlready) {
readyForNewLine = true;
}
finishTag();
writer.write("]");
} else if (tagIsEmpty) {
readyForNewLine = false;
writer.write("{}");
finishTag();
} else {
finishTag();
if (node.fieldAlready) {
writer.write("}");
}
}
readyForNewLine = true;
if (depth == 0 && ((mode & DROP_ROOT_MODE) == 0 || (depth > 0 && !node.isCollection))) {
writer.write("}");
writer.flush();
}
}
private void finishTag() {
if (readyForNewLine) {
endOfLine();
}
readyForNewLine = false;
tagIsEmpty = false;
}
protected void endOfLine() {
writer.write(newLine);
for (int i = 0; i < depth; i++) {
writer.write(lineIndenter);
}
}
public void flush() {
writer.flush();
}
public void close() {
writer.close();
}
public HierarchicalStreamWriter underlyingWriter() {
return this;
}
}