package org.codehaus.jackson.node;
import java.io.IOException;
import org.codehaus.jackson.*;
import org.codehaus.jackson.map.SerializerProvider;
import org.codehaus.jackson.io.NumberInput;
import org.codehaus.jackson.util.ByteArrayBuilder;
import org.codehaus.jackson.util.CharTypes;
/**
* Value node that contains a text value.
*/
public final class TextNode
extends ValueNode
{
final static int INT_SPACE = ' ';
final static TextNode EMPTY_STRING_NODE = new TextNode("");
final String _value;
public TextNode(String v) { _value = v; }
/**
* Factory method that should be used to construct instances.
* For some common cases, can reuse canonical instances: currently
* this is the case for empty Strings, in future possible for
* others as well. If null is passed, will return null.
*
* @return Resulting {@link TextNode} object, if <b>v</b>
* is NOT null; null if it is.
*/
public static TextNode valueOf(String v)
{
if (v == null) {
return null;
}
if (v.length() == 0) {
return EMPTY_STRING_NODE;
}
return new TextNode(v);
}
@Override public JsonToken asToken() { return JsonToken.VALUE_STRING; }
/**
* Yes indeed it is textual
*/
@Override
public boolean isTextual() { return true; }
@Override
public String getTextValue() {
return _value;
}
/**
* Method for accessing textual contents assuming they were
* base64 encoded; if so, they are decoded and resulting binary
* data is returned.
*/
public byte[] getBinaryValue(Base64Variant b64variant)
throws IOException
{
ByteArrayBuilder builder = new ByteArrayBuilder(100);
final String str = _value;
int ptr = 0;
int len = str.length();
main_loop:
while (ptr < len) {
// first, we'll skip preceding white space, if any
char ch;
do {
ch = str.charAt(ptr++);
if (ptr >= len) {
break main_loop;
}
} while (ch <= INT_SPACE);
int bits = b64variant.decodeBase64Char(ch);
if (bits < 0) {
_reportInvalidBase64(b64variant, ch, 0);
}
int decodedData = bits;
// then second base64 char; can't get padding yet, nor ws
if (ptr >= len) {
_reportBase64EOF();
}
ch = str.charAt(ptr++);
bits = b64variant.decodeBase64Char(ch);
if (bits < 0) {
_reportInvalidBase64(b64variant, ch, 1);
}
decodedData = (decodedData << 6) | bits;
// third base64 char; can be padding, but not ws
if (ptr >= len) {
// but as per [JACKSON-631] can be end-of-input, iff not using padding
if (!b64variant.usesPadding()) {
// Got 12 bits, only need 8, need to shift
decodedData >>= 4;
builder.append(decodedData);
break;
}
_reportBase64EOF();
}
ch = str.charAt(ptr++);
bits = b64variant.decodeBase64Char(ch);
// First branch: can get padding (-> 1 byte)
if (bits < 0) {
if (bits != Base64Variant.BASE64_VALUE_PADDING) {
_reportInvalidBase64(b64variant, ch, 2);
}
// Ok, must get padding
if (ptr >= len) {
_reportBase64EOF();
}
ch = str.charAt(ptr++);
if (!b64variant.usesPaddingChar(ch)) {
_reportInvalidBase64(b64variant, ch, 3, "expected padding character '"+b64variant.getPaddingChar()+"'");
}
// Got 12 bits, only need 8, need to shift
decodedData >>= 4;
builder.append(decodedData);
continue;
}
// Nope, 2 or 3 bytes
decodedData = (decodedData << 6) | bits;
// fourth and last base64 char; can be padding, but not ws
if (ptr >= len) {
// but as per [JACKSON-631] can be end-of-input, iff not using padding
if (!b64variant.usesPadding()) {
decodedData >>= 2;
builder.appendTwoBytes(decodedData);
break;
}
_reportBase64EOF();
}
ch = str.charAt(ptr++);
bits = b64variant.decodeBase64Char(ch);
if (bits < 0) {
if (bits != Base64Variant.BASE64_VALUE_PADDING) {
_reportInvalidBase64(b64variant, ch, 3);
}
decodedData >>= 2;
builder.appendTwoBytes(decodedData);
} else {
// otherwise, our triple is now complete
decodedData = (decodedData << 6) | bits;
builder.appendThreeBytes(decodedData);
}
}
return builder.toByteArray();
}
@Override
public byte[] getBinaryValue() throws IOException
{
return getBinaryValue(Base64Variants.getDefaultVariant());
}
/*
/**********************************************************
/* General type coercions
/**********************************************************
*/
@Override
public String asText() {
return _value;
}
// note: neither fast nor elegant, but these work for now:
@Override
public boolean asBoolean(boolean defaultValue) {
if (_value != null) {
if ("true".equals(_value.trim())) {
return true;
}
}
return defaultValue;
}
@Override
public int asInt(int defaultValue) {
return NumberInput.parseAsInt(_value, defaultValue);
}
@Override
public long asLong(long defaultValue) {
return NumberInput.parseAsLong(_value, defaultValue);
}
@Override
public double asDouble(double defaultValue) {
return NumberInput.parseAsDouble(_value, defaultValue);
}
/*
/**********************************************************
/* Serialization
/**********************************************************
*/
@Override
public final void serialize(JsonGenerator jg, SerializerProvider provider)
throws IOException, JsonProcessingException
{
if (_value == null) {
jg.writeNull();
} else {
jg.writeString(_value);
}
}
/*
/**********************************************************
/* Overridden standard methods
/**********************************************************
*/
@Override
public boolean equals(Object o)
{
if (o == this) return true;
if (o == null) return false;
if (o.getClass() != getClass()) { // final class, can do this
return false;
}
return ((TextNode) o)._value.equals(_value);
}
@Override
public int hashCode() { return _value.hashCode(); }
/**
* Different from other values, Strings need quoting
*/
@Override
public String toString()
{
int len = _value.length();
len = len + 2 + (len >> 4);
StringBuilder sb = new StringBuilder(len);
appendQuoted(sb, _value);
return sb.toString();
}
protected static void appendQuoted(StringBuilder sb, String content)
{
sb.append('"');
CharTypes.appendQuoted(sb, content);
sb.append('"');
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
protected void _reportInvalidBase64(Base64Variant b64variant, char ch, int bindex)
throws JsonParseException
{
_reportInvalidBase64(b64variant, ch, bindex, null);
}
/**
* @param bindex Relative index within base64 character unit; between 0
* and 3 (as unit has exactly 4 characters)
*/
protected void _reportInvalidBase64(Base64Variant b64variant, char ch, int bindex, String msg)
throws JsonParseException
{
String base;
if (ch <= INT_SPACE) {
base = "Illegal white space character (code 0x"+Integer.toHexString(ch)+") as character #"+(bindex+1)+" of 4-char base64 unit: can only used between units";
} else if (b64variant.usesPaddingChar(ch)) {
base = "Unexpected padding character ('"+b64variant.getPaddingChar()+"') as character #"+(bindex+1)+" of 4-char base64 unit: padding only legal as 3rd or 4th character";
} else if (!Character.isDefined(ch) || Character.isISOControl(ch)) {
// Not sure if we can really get here... ? (most illegal xml chars are caught at lower level)
base = "Illegal character (code 0x"+Integer.toHexString(ch)+") in base64 content";
} else {
base = "Illegal character '"+ch+"' (code 0x"+Integer.toHexString(ch)+") in base64 content";
}
if (msg != null) {
base = base + ": " + msg;
}
throw new JsonParseException(base, JsonLocation.NA);
}
protected void _reportBase64EOF()
throws JsonParseException
{
throw new JsonParseException("Unexpected end-of-String when base64 content", JsonLocation.NA);
}
}