com.ibm.cloud.objectstorage.thirdparty.ion.util.Printer Maven / Gradle / Ivy
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/*
* Copyright 2007-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* or in the "license" file accompanying this file. This file 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 software.amazon.ion.util;
import static software.amazon.ion.SystemSymbols.IMPORTS;
import static software.amazon.ion.SystemSymbols.ION_1_0_SID;
import static software.amazon.ion.SystemSymbols.ION_SYMBOL_TABLE;
import static software.amazon.ion.SystemSymbols.SYMBOLS;
import software.amazon.ion.Decimal;
import software.amazon.ion.IonBlob;
import software.amazon.ion.IonBool;
import software.amazon.ion.IonClob;
import software.amazon.ion.IonDatagram;
import software.amazon.ion.IonDecimal;
import software.amazon.ion.IonFloat;
import software.amazon.ion.IonInt;
import software.amazon.ion.IonList;
import software.amazon.ion.IonNull;
import software.amazon.ion.IonReader;
import software.amazon.ion.IonSequence;
import software.amazon.ion.IonSexp;
import software.amazon.ion.IonString;
import software.amazon.ion.IonStruct;
import software.amazon.ion.IonSymbol;
import software.amazon.ion.IonTimestamp;
import software.amazon.ion.IonType;
import software.amazon.ion.IonValue;
import software.amazon.ion.IonWriter;
import software.amazon.ion.SymbolTable;
import software.amazon.ion.SymbolToken;
import software.amazon.ion.Timestamp;
import software.amazon.ion.impl._Private_IonSymbol;
import software.amazon.ion.impl._Private_IonSystem;
import software.amazon.ion.impl._Private_IonTextWriterBuilder;
import software.amazon.ion.impl._Private_IonValue;
import software.amazon.ion.impl._Private_IonValue.SymbolTableProvider;
import software.amazon.ion.system.IonTextWriterBuilder;
import software.amazon.ion.system.IonTextWriterBuilder.LstMinimizing;
import software.amazon.ion.system.IonWriterBuilder.IvmMinimizing;
import software.amazon.ion.util.IonTextUtils.SymbolVariant;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.Iterator;
/**
* Renders {@link IonValue}s to text.
*
* By default, output is in a compact format with minimal whitespace.
* For example:
*
* annot::{f1:["hello","goodbye"],'another field':long::0}
*
* The format can be tuned through various properties on the Printer instance,
* as well as through the {@link Printer.Options} structure.
*
* Instances of this class are safe for use by multiple threads.
*
* While printers are inexpensive to create, their configuration facilities
* make them useful as shared resources. Changes to configuration settings
* (e.g., {@link #setJsonMode()}) do not affect concurrently-running
* calls to {@link #print}.
*
* @see IonWriter
* @see IonTextWriterBuilder
*/
public class Printer
{
public class Options
implements Cloneable
{
public boolean blobAsString;
public boolean clobAsString;
public boolean datagramAsList;
public boolean decimalAsFloat;
public boolean sexpAsList;
public boolean skipAnnotations;
public boolean skipSystemValues;
public boolean simplifySystemValues;
public boolean stringAsJson;
public boolean symbolAsString;
public boolean timestampAsString;
public boolean timestampAsMillis;
public boolean untypedNulls;
@Override
public Options clone()
{
try
{
return (Options) super.clone();
}
catch (CloneNotSupportedException e)
{
throw new InternalError();
}
}
}
protected Options myOptions = new Options();
public Printer()
{
myOptions = new Options();
}
public Printer(Options options)
{
myOptions = options.clone();
}
//=========================================================================
// Options
/* Potential printing options:
*
* - Render all times with a specific offset (what about unknowns?)
* - Render all times with long offset (no Z)
* - control over decimal-point placement in float and decimal.
* (render 12.00 or 1200d-2)
*/
/**
* Indicates whether this printer skips (i.e., doesn't print)
* system IDs and local symbol tables.
* By default, this property is false.
*/
public synchronized boolean getSkipSystemValues()
{
return myOptions.skipSystemValues;
}
/**
* Sets whether this printer skips (i.e., doesn't print)
* system IDs and local symbol tables.
* By default, this property is false.
*/
public synchronized void setSkipSystemValues(boolean skip)
{
myOptions.skipSystemValues = skip;
}
/**
* Indicates whether this printer skips (i.e., doesn't print)
* annotations.
* By default, this property is false.
*/
public synchronized boolean getSkipAnnotations()
{
return myOptions.skipAnnotations;
}
/**
* Sets whether this printer skips (i.e., doesn't print)
* annotations.
* By default, this property is false.
*/
public synchronized void setSkipAnnotations(boolean skip)
{
myOptions.skipAnnotations = skip;
}
/**
* Indicates whether this printer renders blobs as Base64 strings.
* By default, this is false.
*/
public synchronized boolean getPrintBlobAsString()
{
return myOptions.blobAsString;
}
/**
* Sets whether this printer renders blobs as Base64 strings.
* By default, this is false.
*/
public synchronized void setPrintBlobAsString(boolean blobAsString)
{
myOptions.blobAsString = blobAsString;
}
/**
* Indicates whether this printer renders clobs as ASCII strings.
* By default, this is false.
*/
public synchronized boolean getPrintClobAsString()
{
return myOptions.clobAsString;
}
/**
* Sets whether this printer renders clobs as ASCII strings.
* By default, this is false.
*/
public synchronized void setPrintClobAsString(boolean clobAsString)
{
myOptions.clobAsString = clobAsString;
}
/**
* Indicates whether this printer renders datagrams as lists.
* By default, this property is false.
*/
public synchronized boolean getPrintDatagramAsList()
{
return myOptions.datagramAsList;
}
/**
* Sets whether this printer renders datagrams as lists.
* By default, this property is false.
*/
public synchronized void setPrintDatagramAsList(boolean datagramAsList)
{
myOptions.datagramAsList = datagramAsList;
}
/**
* Indicates whether this printer renders decimals as floats, thus using 'e'
* notation for all real values.
* By default, this is false.
*/
public synchronized boolean getPrintDecimalAsFloat()
{
return myOptions.decimalAsFloat;
}
/**
* Sets whether this printer renders decimals as floats, thus using 'e'
* notation for all real values.
* By default, this is false.
*/
public synchronized void setPrintDecimalAsFloat(boolean decimalAsFloat)
{
myOptions.decimalAsFloat = decimalAsFloat;
}
/**
* Indicates whether this printer renders sexps as lists.
* By default, this is false.
*/
public synchronized boolean getPrintSexpAsList()
{
return myOptions.sexpAsList;
}
/**
* Sets whether this printer renders sexps as lists.
* By default, this is false.
*/
public synchronized void setPrintSexpAsList(boolean sexpAsList)
{
myOptions.sexpAsList = sexpAsList;
}
/**
* Indicates whether this printer renders strings using JSON escapes.
* By default, this is false.
*/
public synchronized boolean getPrintStringAsJson()
{
return myOptions.stringAsJson;
}
/**
* Sets whether this printer renders strings using JSON escapes.
* By default, this is false.
*/
public synchronized void setPrintStringAsJson(boolean stringAsJson)
{
myOptions.stringAsJson = stringAsJson;
}
/**
* Indicates whether this printer renders symbols as strings.
* By default, this is false.
*/
public synchronized boolean getPrintSymbolAsString()
{
return myOptions.symbolAsString;
}
/**
* Sets whether this printer renders symbols as strings.
* By default, this is false.
*/
public synchronized void setPrintSymbolAsString(boolean symbolAsString)
{
myOptions.symbolAsString = symbolAsString;
}
/**
* Indicates whether this printer renders timestamps as millisecond values.
* By default, this is false.
*/
public synchronized boolean getPrintTimestampAsMillis()
{
return myOptions.timestampAsMillis;
}
/**
* Sets whether this printer renders timestamps as millisecond values.
* By default, this is false.
*/
public synchronized void setPrintTimestampAsMillis(boolean timestampAsMillis)
{
myOptions.timestampAsMillis = timestampAsMillis;
}
/**
* Indicates whether this printer renders timestamps as strings.
* By default, this is false.
*/
public synchronized boolean getPrintTimestampAsString()
{
return myOptions.timestampAsString;
}
/**
* Sets whether this printer renders timestamps as strings.
* By default, this is false.
*/
public synchronized void setPrintTimestampAsString(boolean timestampAsString)
{
myOptions.timestampAsString = timestampAsString;
}
/**
* Indicates whether this printer renders all null values as {@code null}
* (i.e., the same as an {@link IonNull}).
* By default, this is false.
*/
public synchronized boolean getPrintUntypedNulls()
{
return myOptions.untypedNulls;
}
/**
* Sets whether this printer renders all null values as {@code null}
* (i.e., the same as an {@link IonNull}).
* By default, this is false.
*/
public synchronized void setPrintUntypedNulls(boolean untypedNulls)
{
myOptions.untypedNulls = untypedNulls;
}
/**
* Configures this printer's options to render legal JSON text.
* The following options are modified so that:
*
* - {@link Options#blobAsString} is {@code true}
* - {@link Options#clobAsString} is {@code true}
* - {@link Options#datagramAsList} is {@code true}
* - {@link Options#decimalAsFloat} is {@code true}
* - {@link Options#sexpAsList} is {@code true}
* - {@link Options#skipAnnotations} is {@code true}
* - {@link Options#skipSystemValues} is {@code true}
* - {@link Options#stringAsJson} is {@code true}
* - {@link Options#symbolAsString} is {@code true}
* - {@link Options#timestampAsString} is {@code false}
* - {@link Options#timestampAsMillis} is {@code true}
* - {@link Options#untypedNulls} is {@code true}
*
* All other options are left as is.
*/
public synchronized void setJsonMode()
{
myOptions.blobAsString = true;
myOptions.clobAsString = true;
myOptions.datagramAsList = true;
myOptions.decimalAsFloat = true;
myOptions.sexpAsList = true;
myOptions.skipAnnotations = true;
myOptions.skipSystemValues = true;
myOptions.stringAsJson = true;
myOptions.symbolAsString = true;
myOptions.timestampAsString = false;
myOptions.timestampAsMillis = true;
myOptions.untypedNulls = true;
}
//=========================================================================
// Print methods
public void print(IonValue value, Appendable out)
throws IOException
{
// Copy the options so visitor won't see changes made while printing.
Options options;
synchronized (this) // So we don't clone in the midst of changes
{
options = myOptions.clone();
}
if (true)
{
_print(value, makeVisitor(options, out));
}
else
{
// Bridge to the configurable text writer. This is here for
// testing purposes. It *almost* works except for printing
// datagram as list.
boolean dg = value instanceof IonDatagram;
_Private_IonTextWriterBuilder o =
_Private_IonTextWriterBuilder.standard();
o.setCharset(IonTextWriterBuilder.ASCII);
if (dg)
{
if (options.skipSystemValues)
{
o.withMinimalSystemData();
}
else if (options.simplifySystemValues) {
o.setIvmMinimizing(IvmMinimizing.DISTANT);
o.setLstMinimizing(LstMinimizing.LOCALS);
}
}
o._blob_as_string = options.blobAsString;
o._clob_as_string = options.clobAsString;
o._decimal_as_float = options.decimalAsFloat;
// TODO datagram as list
o._sexp_as_list = options.sexpAsList;
o._skip_annotations = options.skipAnnotations;
o._string_as_json = options.stringAsJson;
o._symbol_as_string = options.symbolAsString;
o._timestamp_as_millis = options.timestampAsMillis;
o._timestamp_as_string = options.timestampAsString;
o._untyped_nulls = options.untypedNulls;
IonWriter writer = o.build(out);
// TODO doesn't work for datagram since it skips system values
// value.writeTo(writer);
_Private_IonSystem system = (_Private_IonSystem) value.getSystem();
IonReader reader = system.newSystemReader(value);
writer.writeValues(reader);
writer.finish();
}
}
private void _print(IonValue value, PrinterVisitor pv)
throws IOException
{
try
{
if (! (value instanceof IonDatagram))
{
pv.setSymbolTableProvider(new BasicSymbolTableProvider(value.getSymbolTable()));
}
value.accept(pv);
}
catch (IOException e)
{
throw e;
}
catch (RuntimeException e)
{
throw e;
}
catch (Exception e)
{
// Shouldn't happen.
throw new RuntimeException(e);
}
}
/**
* Subclasses can override this if they wish to construct a specialization
* of the {@link PrinterVisitor}.
*
* @param options is a fresh copy of the Printer's options instance,
* not null.
* @param out is not null.
* @return the visitor to invoke for printing.
*/
protected PrinterVisitor makeVisitor(Options options, Appendable out)
{
return new PrinterVisitor(options, out);
}
private static class BasicSymbolTableProvider
implements SymbolTableProvider
{
private final SymbolTable symbolTable;
public BasicSymbolTableProvider(SymbolTable symbolTable)
{
this.symbolTable = symbolTable;
}
public SymbolTable getSymbolTable()
{
return symbolTable;
}
}
//=========================================================================
// Print methods
public static class PrinterVisitor
extends AbstractValueVisitor
{
final protected Options myOptions;
final protected Appendable myOut;
/**
* Should we quote operators at the current level of the hierarchy?
* As we recurse down into containers, this value is pushed on the
* stack by {@link #writeChild(IonValue, boolean)}.
*/
private boolean myQuoteOperators = true;
private SymbolTableProvider mySymbolTableProvider = null;
//---------------------------------------------------------------------
public PrinterVisitor(Options options, Appendable out)
{
myOptions = options;
myOut = out;
}
void setSymbolTableProvider(SymbolTableProvider symbolTableProvider)
{
mySymbolTableProvider = symbolTableProvider;
}
/**
* Recurse down into a container, we push the current value of
* {@link #myQuoteOperators} onto the stack and replace it with
* the given value.
*
* @param value
* @param quoteOperators replaces the current value of
* {@link #myQuoteOperators} during the recursive visitation.
* @throws Exception propagated from visitation of value.
* @throws NullPointerException if value is null.
*/
protected void writeChild(IonValue value, boolean quoteOperators)
throws Exception
{
boolean oldQuoteOperators = myQuoteOperators;
myQuoteOperators = quoteOperators;
value.accept(this);
myQuoteOperators = oldQuoteOperators;
}
public void writeAnnotations(IonValue value) throws IOException
{
if (! myOptions.skipAnnotations)
{
SymbolToken[] anns = ((_Private_IonValue)value).getTypeAnnotationSymbols(mySymbolTableProvider);
if (anns != null)
{
for (SymbolToken ann : anns) {
String text = ann.getText();
if (text == null) {
myOut.append('$');
myOut.append(Integer.toString(ann.getSid()));
}
else {
IonTextUtils.printSymbol(myOut, text);
}
myOut.append("::");
}
}
}
}
public void writeNull(String type) throws IOException
{
if (myOptions.untypedNulls)
{
myOut.append("null");
}
else
{
myOut.append("null.");
myOut.append(type);
}
}
public void writeSequenceContent(IonSequence value,
boolean quoteOperators,
char open,
char separator,
char close)
throws IOException, Exception
{
myOut.append(open);
boolean hitOne = false;
for (IonValue child : value)
{
if (hitOne)
{
myOut.append(separator);
}
hitOne = true;
writeChild(child, quoteOperators);
}
myOut.append(close);
}
public void writeSymbolToken(SymbolToken sym) throws IOException
{
String text = sym.getText();
if (text != null)
{
writeSymbol(text);
}
else
{
int sid = sym.getSid();
if (sid < 0)
{
throw new IllegalArgumentException("Bad SID " + sid);
}
text = "$" + sym.getSid();
if (myOptions.symbolAsString)
{
writeString(text);
}
else
{
myOut.append(text); // SID literal is never quoted
}
}
}
public void writeSymbol(String text) throws IOException
{
if (myOptions.symbolAsString)
{
writeString(text);
}
else
{
SymbolVariant variant = IonTextUtils.symbolVariant(text);
switch (variant)
{
case IDENTIFIER:
myOut.append(text);
break;
case OPERATOR:
if (! myQuoteOperators)
{
myOut.append(text);
break;
}
// else fall through...
case QUOTED:
IonTextUtils.printQuotedSymbol(myOut, text);
break;
}
}
}
/**
* @param text may be null
*/
public void writeString(String text) throws IOException
{
if (myOptions.stringAsJson)
{
IonTextUtils.printJsonString(myOut, text);
}
else
{
IonTextUtils.printString(myOut, text);
}
}
//---------------------------------------------------------------------
// AbstractValueVisitor overrides
@Override
protected void defaultVisit(IonValue value)
{
String message = "cannot print " + value.getClass().getName();
throw new UnsupportedOperationException(message);
}
@Override
public void visit(IonBlob value) throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("blob");
}
else
{
myOut.append(myOptions.blobAsString ? "\"" : "{{");
value.printBase64(myOut);
myOut.append(myOptions.blobAsString ? "\"" : "}}");
}
}
@Override
public void visit(IonBool value)
throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("bool");
}
else
{
myOut.append(value.booleanValue() ? "true" : "false");
}
}
@Override
public void visit(IonClob value) throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("clob");
}
else
{
if (! myOptions.clobAsString)
{
myOut.append("{{");
}
myOut.append('"');
InputStream byteStream = value.newInputStream();
try
{
int c;
// if-statement hoisted above loop for efficiency
if (myOptions.stringAsJson)
{
while ((c = byteStream.read()) != -1)
{
IonTextUtils.printJsonCodePoint(myOut, c);
}
}
else
{
while ((c = byteStream.read()) != -1)
{
IonTextUtils.printStringCodePoint(myOut, c);
}
}
}
finally
{
byteStream.close();
}
myOut.append('"');
if (! myOptions.clobAsString)
{
myOut.append("}}");
}
}
}
@Override
public void visit(IonDatagram value) throws IOException, Exception
{
Iterator i = (myOptions.skipSystemValues
? value.iterator()
: value.systemIterator());
final boolean asList = myOptions.datagramAsList;
if (asList)
{
myOut.append('[');
}
boolean hitOne = false;
// If we're skipping system values at the iterator level,
// we don't need to bother trying to simplify them.
final boolean simplify_system_values =
myOptions.simplifySystemValues && ! myOptions.skipSystemValues;
SymbolTable previous_symbols = null;
while (i.hasNext())
{
IonValue child = i.next();
SymbolTable childSymbolTable = child.getSymbolTable();
mySymbolTableProvider = new BasicSymbolTableProvider(childSymbolTable); //children of datagrams are top-level values
if (simplify_system_values)
{
child = simplify(child, previous_symbols);
previous_symbols = childSymbolTable;
}
if (child != null)
{
if (hitOne)
{
myOut.append(asList ? ',' : ' ');
}
writeChild(child, true);
hitOne = true; // we've only "hit one" if we wrote it
}
}
if (asList)
{
myOut.append(']');
}
}
private final IonValue simplify(IonValue child,
SymbolTable previous_symbols)
{
IonType t = child.getType();
switch (t) {
case STRUCT:
if (child.hasTypeAnnotation(ION_SYMBOL_TABLE)) {
if (symbol_table_struct_has_imports(child))
{
return ((IonStruct)child).cloneAndRemove(SYMBOLS);
}
return null;
}
// fall through to default (print the value)
break;
case SYMBOL:
if (((IonSymbol)child).getSymbolId() == ION_1_0_SID) {
if (previous_symbols != null && previous_symbols.isSystemTable()) {
return null;
}
// fall through to default (print the value)
}
// fall through to default (print the value)
break;
default:
break;
}
return child;
}
static final private boolean symbol_table_struct_has_imports(IonValue child) {
IonStruct struct = (IonStruct)child;
IonValue imports = struct.get(IMPORTS);
if (imports instanceof IonList) {
return ((IonList)imports).size() != 0;
}
return false;
}
@Override
public void visit(IonDecimal value) throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("decimal");
}
else
{
Decimal decimal = value.decimalValue();
BigInteger unscaled = decimal.unscaledValue();
int signum = decimal.signum();
if (signum < 0)
{
myOut.append('-');
unscaled = unscaled.negate();
}
else if (signum == 0 && decimal.isNegativeZero())
{
// for the various forms of negative zero we have to
// write the sign ourselves, since neither BigInteger
// nor BigDecimal recognize negative zero, but Ion does.
myOut.append('-');
}
final String unscaledText = unscaled.toString();
final int significantDigits = unscaledText.length();
final int scale = decimal.scale();
final int exponent = -scale;
if (myOptions.decimalAsFloat)
{
myOut.append(unscaledText);
myOut.append('e');
myOut.append(Integer.toString(exponent));
}
else if (exponent == 0)
{
myOut.append(unscaledText);
myOut.append('.');
}
else if (0 < scale)
{
int wholeDigits;
int remainingScale;
if (significantDigits > scale)
{
wholeDigits = significantDigits - scale;
remainingScale = 0;
}
else
{
wholeDigits = 1;
remainingScale = scale - significantDigits + 1;
}
myOut.append(unscaledText, 0, wholeDigits);
if (wholeDigits < significantDigits)
{
myOut.append('.');
myOut.append(unscaledText, wholeDigits,
significantDigits);
}
if (remainingScale != 0)
{
myOut.append("d-");
myOut.append(Integer.toString(remainingScale));
}
}
else // (exponent > 0)
{
// We cannot move the decimal point to the right, adding
// rightmost zeros, because that would alter the precision.
myOut.append(unscaledText);
myOut.append('d');
myOut.append(Integer.toString(exponent));
}
}
}
@Override
public void visit(IonFloat value) throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("float");
}
else
{
double real = value.doubleValue();
IonTextUtils.printFloat(myOut, real);
}
}
@Override
public void visit(IonInt value) throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("int");
}
else
{
myOut.append(value.bigIntegerValue().toString(10));
}
}
@Override
public void visit(IonList value) throws IOException, Exception
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("list");
}
else
{
writeSequenceContent(value, true, '[', ',', ']');
}
}
@Override
public void visit(IonNull value) throws IOException
{
writeAnnotations(value);
myOut.append("null");
}
@Override
public void visit(IonSexp value) throws IOException, Exception
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("sexp");
}
else if (myOptions.sexpAsList)
{
writeSequenceContent(value, true, '[', ',', ']');
}
else
{
writeSequenceContent(value, false, '(', ' ', ')');
}
}
@Override
public void visit(IonString value) throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("string");
}
else
{
writeString(value.stringValue());
}
}
@Override
public void visit(IonStruct value) throws IOException, Exception
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("struct");
}
else
{
myOut.append('{');
boolean hitOne = false;
for (IonValue child : value)
{
if (hitOne)
{
myOut.append(',');
}
hitOne = true;
SymbolToken sym = ((_Private_IonValue)child).getFieldNameSymbol(mySymbolTableProvider);
writeSymbolToken(sym);
myOut.append(':');
writeChild(child, true);
}
myOut.append('}');
}
}
@Override
public void visit(IonSymbol value) throws IOException
{
writeAnnotations(value);
SymbolToken is = ((_Private_IonSymbol)value).symbolValue(mySymbolTableProvider);
if (is == null)
{
writeNull("symbol");
}
else
{
writeSymbolToken(is);
}
}
@Override
public void visit(IonTimestamp value) throws IOException
{
writeAnnotations(value);
if (value.isNullValue())
{
writeNull("timestamp");
}
else if (myOptions.timestampAsMillis)
{
myOut.append(Long.toString(value.getMillis()));
}
else
{
Timestamp ts = value.timestampValue();
if (myOptions.timestampAsString)
{
myOut.append('"');
ts.print(myOut);
myOut.append('"');
}
else
{
ts.print(myOut);
}
}
}
}
}