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// ***************************************************************************************************************************
// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file *
// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file *
// * to you 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. *
// ***************************************************************************************************************************
package org.apache.juneau.uon;
import java.io.*;
import org.apache.juneau.*;
import org.apache.juneau.internal.*;
import org.apache.juneau.serializer.*;
/**
* Specialized writer for serializing UON-encoded text.
*
*
Notes:
*
*
This class is not intended for external use.
*
*/
public final class UonWriter extends SerializerWriter {
private final UonSerializerSession session;
private final boolean encodeChars, plainTextParams;
// Characters that do not need to be URL-encoded in strings.
private static final AsciiSet unencodedChars = new AsciiSet("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789;/?:@-_.!*'$(),~=");
// Characters that do not need to be URL-encoded in attribute names.
// Identical to unencodedChars, but excludes '='.
private static final AsciiSet unencodedCharsAttrName = new AsciiSet("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789;/?:@-_.!*'$(),~");
// Characters that need to be preceded with an escape character.
private static final AsciiSet escapedChars = new AsciiSet("~'");
private static final AsciiSet noChars = new AsciiSet("");
private static char[] hexArray = "0123456789ABCDEF".toCharArray();
/**
* Constructor.
*
* @param session The session that created this writer.
* @param out The writer being wrapped.
* @param useWhitespace If true, tabs will be used in output.
* @param maxIndent The maximum indentation level.
* @param encodeChars If true, special characters should be encoded.
* @param trimStrings If true, strings should be trimmed before they're serialized.
* @param plainTextParams If true, don't use UON notation for values.
* @param uriResolver The URI resolver for resolving URIs to absolute or root-relative form.
*/
protected UonWriter(UonSerializerSession session, Writer out, boolean useWhitespace, int maxIndent,
boolean encodeChars, boolean trimStrings, boolean plainTextParams, UriResolver uriResolver) {
super(out, useWhitespace, maxIndent, trimStrings, '\'', uriResolver);
this.session = session;
this.encodeChars = encodeChars;
this.plainTextParams = plainTextParams;
}
/**
* Serializes the specified simple object as a UON string value.
*
* @param o The object being serialized.
* @param isTopAttrName If this is a top-level attribute name we're serializing.
* @return This object (for method chaining).
* @throws IOException Should never happen.
*/
public final UonWriter appendObject(Object o, boolean isTopAttrName) throws IOException {
if (o instanceof Boolean)
return appendBoolean(o);
if (o instanceof Number)
return appendNumber(o);
if (o == null)
return append("null");
String s = session.toString(o);
boolean needsQuotes = (! plainTextParams) && UonUtils.needsQuotes(s);
AsciiSet unenc = (isTopAttrName ? unencodedCharsAttrName : unencodedChars);
AsciiSet esc = plainTextParams ? noChars : escapedChars;
if (needsQuotes)
append('\'');
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (esc.contains(c))
append('~');
if ((!encodeChars) || unenc.contains(c))
append(c);
else {
if (c == ' ')
append('+');
else {
int p = s.codePointAt(i);
if (p < 0x0080)
appendHex(p);
else if (p < 0x0800) {
int p1=p>>>6;
appendHex(p1+192).appendHex((p&63)+128);
} else if (p < 0x10000) {
int p1=p>>>6, p2=p1>>>6;
appendHex(p2+224).appendHex((p1&63)+128).appendHex((p&63)+128);
} else {
i++; // Two-byte codepoint...skip past surrogate pair lower byte.
int p1=p>>>6, p2=p1>>>6, p3=p2>>>6;
appendHex(p3+240).appendHex((p2&63)+128).appendHex((p1&63)+128).appendHex((p&63)+128);
}
}
}
}
if (needsQuotes)
append('\'');
return this;
}
/**
* Appends a boolean value to the output.
*
* @param o The boolean value to append to the output.
* @return This object (for method chaining).
* @throws IOException
*/
protected UonWriter appendBoolean(Object o) throws IOException {
append(o.toString());
return this;
}
/**
* Appends a numeric value to the output.
*
* @param o The numeric value to append to the output.
* @return This object (for method chaining).
* @throws IOException
*/
protected UonWriter appendNumber(Object o) throws IOException {
append(o.toString());
return this;
}
/**
* Prints out a two-byte %xx sequence for the given byte value.
*/
private UonWriter appendHex(int b) throws IOException {
if (b > 255)
throw new IOException("Invalid value passed to appendHex. Must be in the range 0-255. Value=" + b);
append('%').append(hexArray[b>>>4]).append(hexArray[b&0x0F]);
return this;
}
/**
* Appends a URI to the output.
*
* @param uri The URI to append to the output.
* @return This object (for method chaining).
* @throws IOException
*/
@Override
public SerializerWriter appendUri(Object uri) throws IOException {
return appendObject(uriResolver.resolve(uri), false);
}
//--------------------------------------------------------------------------------
// Overridden methods
//--------------------------------------------------------------------------------
@Override /* SerializerWriter */
public UonWriter cr(int depth) throws IOException {
super.cr(depth);
return this;
}
@Override /* SerializerWriter */
public UonWriter cre(int depth) throws IOException {
super.cre(depth);
return this;
}
@Override /* SerializerWriter */
public UonWriter appendln(int indent, String text) throws IOException {
super.appendln(indent, text);
return this;
}
@Override /* SerializerWriter */
public UonWriter appendln(String text) throws IOException {
super.appendln(text);
return this;
}
@Override /* SerializerWriter */
public UonWriter append(int indent, String text) throws IOException {
super.append(indent, text);
return this;
}
@Override /* SerializerWriter */
public UonWriter append(int indent, char c) throws IOException {
super.append(indent, c);
return this;
}
@Override /* SerializerWriter */
public UonWriter q() throws IOException {
super.q();
return this;
}
@Override /* SerializerWriter */
public UonWriter i(int indent) throws IOException {
super.i(indent);
return this;
}
@Override /* SerializerWriter */
public UonWriter nl(int indent) throws IOException {
super.nl(indent);
return this;
}
@Override /* SerializerWriter */
public UonWriter append(Object text) throws IOException {
super.append(text);
return this;
}
@Override /* SerializerWriter */
public UonWriter append(String text) throws IOException {
super.append(text);
return this;
}
@Override /* SerializerWriter */
public UonWriter appendIf(boolean b, String text) throws IOException {
super.appendIf(b, text);
return this;
}
@Override /* SerializerWriter */
public UonWriter appendIf(boolean b, char c) throws IOException {
super.appendIf(b, c);
return this;
}
@Override /* SerializerWriter */
public UonWriter append(char c) throws IOException {
super.append(c);
return this;
}
}
