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A Java implementation of the Amazon Ion data notation.
/*
* Copyright 2015-2016 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://aws.amazon.com/apache2.0/
*
* 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.impl.bin;
import static java.util.Collections.unmodifiableList;
import static software.amazon.ion.IonType.LIST;
import static software.amazon.ion.IonType.STRUCT;
import static software.amazon.ion.SystemSymbols.IMPORTS_SID;
import static software.amazon.ion.SystemSymbols.ION_1_0_MAX_ID;
import static software.amazon.ion.SystemSymbols.ION_1_0_SID;
import static software.amazon.ion.SystemSymbols.ION_SYMBOL_TABLE_SID;
import static software.amazon.ion.SystemSymbols.MAX_ID_SID;
import static software.amazon.ion.SystemSymbols.NAME_SID;
import static software.amazon.ion.SystemSymbols.SYMBOLS_SID;
import static software.amazon.ion.SystemSymbols.VERSION_SID;
import static software.amazon.ion.impl.bin.Symbols.symbol;
import static software.amazon.ion.impl.bin.Symbols.systemSymbol;
import static software.amazon.ion.impl.bin.Symbols.systemSymbolTable;
import static software.amazon.ion.impl.bin.Symbols.systemSymbols;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import software.amazon.ion.IonCatalog;
import software.amazon.ion.IonException;
import software.amazon.ion.IonType;
import software.amazon.ion.SymbolTable;
import software.amazon.ion.SymbolToken;
import software.amazon.ion.Timestamp;
import software.amazon.ion.impl.PrivateUtils;
import software.amazon.ion.impl.bin.IonRawBinaryWriter.StreamCloseMode;
import software.amazon.ion.impl.bin.IonRawBinaryWriter.StreamFlushMode;
/** Wraps {@link IonRawBinaryWriter} with symbol table management. */
/*package*/ final class IonManagedBinaryWriter extends AbstractIonWriter
{
private interface SymbolResolver
{
/** Resolves a {@link SymbolToken} or returns null if the mapping does not exist. */
SymbolToken get(String text);
}
private interface SymbolResolverBuilder
{
/**
* Adds the given table's mappings to the resolver to be constructed.
*
* @param startSid The starting local ID.
* @return the next available ID.
*/
int addSymbolTable(SymbolTable table, int startSid);
/** Constructs the resolver from the symbols tables added prior to this call. */
SymbolResolver build();
}
private static final class ImportTablePosition
{
public final SymbolTable table;
public final int startId;
public ImportTablePosition(final SymbolTable table, final int startId)
{
this.table = table;
this.startId = startId;
}
}
/** Determines how imported symbols are resolved (including system symbols). */
/*package*/ enum ImportedSymbolResolverMode
{
/** Symbols are copied into a flat map, this is useful if the context can be reused across builders. */
FLAT
{
@Override
/*package*/ SymbolResolverBuilder createBuilder()
{
final Map symbols = new HashMap();
// add in system tokens
for (final SymbolToken token : systemSymbols())
{
symbols.put(token.getText(), token);
}
return new SymbolResolverBuilder()
{
public int addSymbolTable(final SymbolTable table, final int startSid)
{
int maxSid = startSid;
final Iterator iter = table.iterateDeclaredSymbolNames();
while (iter.hasNext())
{
final String text = iter.next();
if (text != null && !symbols.containsKey(text))
{
symbols.put(text, symbol(text, maxSid));
}
maxSid++;
}
return maxSid;
}
public SymbolResolver build()
{
return new SymbolResolver()
{
public SymbolToken get(final String text)
{
return symbols.get(text);
}
};
}
};
}
},
/** Delegates to a set of symbol tables for symbol resolution, this is useful if the context is thrown away frequently. */
DELEGATE
{
@Override
/*package*/ SymbolResolverBuilder createBuilder()
{
final List imports = new ArrayList();
imports.add(new ImportTablePosition(systemSymbolTable(), 1));
return new SymbolResolverBuilder()
{
public int addSymbolTable(final SymbolTable table, final int startId)
{
imports.add(new ImportTablePosition(table, startId));
return startId + table.getMaxId();
}
public SymbolResolver build()
{
return new SymbolResolver()
{
public SymbolToken get(final String text)
{
for (final ImportTablePosition tableImport : imports)
{
final SymbolToken token = tableImport.table.find(text);
if (token != null)
{
return symbol(text, token.getSid() + tableImport.startId - 1);
}
}
return null;
}
};
}
};
}
};
/*package*/ abstract SymbolResolverBuilder createBuilder();
}
/**
* Provides the import context for the writer.
* This class is immutable and shareable across instances.
*/
/*package*/ static final class ImportedSymbolContext
{
public final List parents;
public final SymbolResolver importedSymbols;
public final int localSidStart;
/*package*/ ImportedSymbolContext(final ImportedSymbolResolverMode mode, final List imports)
{
final List mutableParents = new ArrayList(imports.size());
final SymbolResolverBuilder builder = mode.createBuilder();
// add in imports
int maxSid = ION_1_0_MAX_ID + 1;
for (final SymbolTable st : imports)
{
if (!st.isSharedTable())
{
throw new IonException("Imported symbol table is not shared: " + st);
}
if (st.isSystemTable())
{
// ignore
continue;
}
mutableParents.add(st);
maxSid = builder.addSymbolTable(st, maxSid);
}
this.parents = unmodifiableList(mutableParents);
this.importedSymbols = builder.build();
this.localSidStart = maxSid;
}
}
/*package*/ static final ImportedSymbolContext ONLY_SYSTEM_IMPORTS =
new ImportedSymbolContext(ImportedSymbolResolverMode.FLAT, Collections.emptyList());
private enum SymbolState {
SYSTEM_SYMBOLS
{
@Override
public void closeTable(final IonRawBinaryWriter writer) throws IOException
{
// never generated a table, so emit the IVM
writer.writeIonVersionMarker();
}
},
LOCAL_SYMBOLS_WITH_IMPORTS_ONLY
{
@Override
public void closeTable(final IonRawBinaryWriter writer) throws IOException
{
// never wrote any locals so we only have to pop out one level
writer.stepOut();
}
},
LOCAL_SYMBOLS
{
@Override
public void closeTable(final IonRawBinaryWriter writer) throws IOException {
// close out locals
writer.stepOut();
// close out the local symtab struct
writer.stepOut();
}
},
LOCAL_SYMBOLS_FLUSHED
{
@Override
public void closeTable(final IonRawBinaryWriter writer) throws IOException {
// we already emitted local symbols -- there is nothing to close
}
};
public abstract void closeTable(IonRawBinaryWriter writer) throws IOException;
}
private static class ImportDescriptor
{
public String name;
public int version;
public int maxId;
public ImportDescriptor()
{
reset();
}
public void reset()
{
name = null;
version = -1;
maxId = -1;
}
public boolean isDefined()
{
return name != null && version >= 1;
}
public boolean isUndefined()
{
return name == null && version == -1 && maxId == -1;
}
public boolean isMalformed()
{
return !isDefined() && !isUndefined();
}
@Override
public String toString()
{
return "{name: \"" + name + "\", version: " + version + ", max_id: " + maxId + "}";
}
}
private enum UserState
{
/** no-op for all the interceptors. */
NORMAL
{
@Override
public void beforeStepIn(final IonManagedBinaryWriter self, final IonType type)
{
if (self.user.hasTopLevelSymbolTableAnnotation() && type == STRUCT)
{
self.userState = LOCALS_AT_TOP;
// record where the user symbol table is written
// we're going to clear this out later
self.userSymbolTablePosition = self.user.position();
}
}
@Override
public void afterStepOut(final IonManagedBinaryWriter self) {}
@Override
public void writeInt(IonManagedBinaryWriter self, BigInteger value) {}
},
LOCALS_AT_TOP
{
@Override
public void beforeStepIn(final IonManagedBinaryWriter self, final IonType type)
{
if (self.user.getDepth() == 1)
{
switch (self.user.getFieldId())
{
case IMPORTS_SID:
if (type != LIST)
{
throw new IllegalArgumentException(
"Cannot step into Local Symbol Table 'symbols' field as non-list: " + type);
}
self.userState = LOCALS_AT_IMPORTS;
break;
case SYMBOLS_SID:
if (type != LIST)
{
throw new IllegalArgumentException(
"Cannot step into Local Symbol Table 'symbols' field as non-list: " + type);
}
self.userState = LOCALS_AT_SYMBOLS;
break;
}
}
}
@Override
public void afterStepOut(final IonManagedBinaryWriter self) throws IOException
{
if (self.user.getDepth() == 0)
{
// TODO deal with the fact that any open content in the user provided local symbol table is lost...
// the requirements here are not clear through the API contract, we push through
// the logical symbol table content but basically erase open content and erroneous data
// (e.g. integer in the symbol list or some non-struct in the import list)
// at this point we have to ditch the user provided symbol table and open our own
// since we don't know what's coming after (i.e. new local symbols)
self.user.truncate(self.userSymbolTablePosition);
// flush out the pre-existing symbol and user content before the user provided symbol table
self.finish();
// replace the symbol table context with the user provided one
// TODO determine if the resolver mode should be configurable for this use case
self.imports = new ImportedSymbolContext(ImportedSymbolResolverMode.DELEGATE, self.userImports);
// explicitly start the local symbol table with no version marker
// in case we need the previous symbols
self.startLocalSymbolTableIfNeeded(/*writeIVM*/ false);
// let's go intern all of the local symbols that were provided
// note that this may erase out redundant locals
for (final String text : self.userSymbols)
{
// go and intern all of the locals now that we have context built
self.intern(text);
}
// clear transient work state
self.userSymbolTablePosition = 0L;
self.userCurrentImport.reset();
self.userImports.clear();
self.userSymbols.clear();
self.userState = NORMAL;
}
}
},
LOCALS_AT_IMPORTS
{
@Override
public void beforeStepIn(final IonManagedBinaryWriter self, final IonType type)
{
if (type != STRUCT)
{
throw new IllegalArgumentException(
"Cannot step into non-struct in Local Symbol Table import list: " + type);
}
}
@Override
public void afterStepOut(final IonManagedBinaryWriter self)
{
switch (self.user.getDepth())
{
// finishing up a import struct
case 2:
final ImportDescriptor desc = self.userCurrentImport;
if (desc.isMalformed())
{
throw new IllegalArgumentException("Invalid import: " + desc);
}
if (desc.isDefined())
{
SymbolTable symbols =
self.catalog.getTable(desc.name, desc.version);
if (symbols == null)
{
if (desc.maxId == -1)
{
throw new IllegalArgumentException(
"Import is not in catalog and no max ID provided: " + desc);
}
// TODO determine what the correct behavior here is...
// we don't know what the imports are in the context given
// this is somewhat problematic, but let's put in a substitute
// in case this is intentional
symbols = Symbols.unknownSharedSymbolTable(desc.name, desc.version, desc.maxId);
}
final boolean hasDeclaredMaxId = desc.maxId != -1;
final boolean declaredMaxIdMatches = desc.maxId == symbols.getMaxId();
final boolean declaredVersionMatches = desc.version == symbols.getVersion();
if (hasDeclaredMaxId && (!declaredMaxIdMatches || !declaredVersionMatches))
{
// the max ID doesn't match, so we need a substitute
symbols = PrivateUtils.newSubstituteSymtab(symbols, desc.version, desc.maxId);
}
self.userImports.add(symbols);
}
break;
// done with the import list
case 1:
self.userState = LOCALS_AT_TOP;
break;
}
}
@Override
public void writeString(final IonManagedBinaryWriter self, final String value)
{
if (self.user.getDepth() == 3 && self.user.getFieldId() == NAME_SID)
{
if (value == null)
{
throw new NullPointerException("Cannot have null import name");
}
self.userCurrentImport.name = value;
}
}
@Override
public void writeInt(final IonManagedBinaryWriter self, final long value)
{
if (self.user.getDepth() == 3)
{
if (value > Integer.MAX_VALUE || value < 1)
{
throw new IllegalArgumentException("Invalid integer value in import: " + value);
}
switch (self.user.getFieldId())
{
case VERSION_SID:
self.userCurrentImport.version = (int) value;
break;
case MAX_ID_SID:
self.userCurrentImport.maxId = (int) value;
break;
}
}
}
},
// TODO deal with the case that nonsense is written into the list
LOCALS_AT_SYMBOLS
{
@Override
public void beforeStepIn(final IonManagedBinaryWriter self, final IonType type) {}
@Override
public void afterStepOut(final IonManagedBinaryWriter self) {
if (self.user.getDepth() == 1)
{
self.userState = LOCALS_AT_TOP;
}
}
@Override
public void writeString(final IonManagedBinaryWriter self, String value)
{
if (self.user.getDepth() == 2)
{
self.userSymbols.add(value);
}
}
};
public abstract void beforeStepIn(final IonManagedBinaryWriter self, final IonType type) throws IOException;
public abstract void afterStepOut(final IonManagedBinaryWriter self) throws IOException;
public void writeString(final IonManagedBinaryWriter self, final String value) throws IOException {}
public void writeInt(final IonManagedBinaryWriter self, final long value) throws IOException {}
public void writeInt(IonManagedBinaryWriter self, BigInteger value) throws IOException
{
// this will truncate if too big--but we don't care for interception
writeInt(self, value.longValue());
}
}
private static final SymbolTable[] EMPTY_SYMBOL_TABLE_ARRAY = new SymbolTable[0];
/** View over the internal local symbol table state as a symbol table. */
private class LocalSymbolTableView extends AbstractSymbolTable
{
public LocalSymbolTableView()
{
super(null, 0);
}
public Iterator iterateDeclaredSymbolNames()
{
return locals.keySet().iterator();
}
public int getMaxId()
{
return getImportedMaxId() + locals.size();
}
public SymbolTable[] getImportedTables()
{
return imports.parents.toArray(EMPTY_SYMBOL_TABLE_ARRAY);
}
public int getImportedMaxId()
{
return imports.localSidStart - 1;
}
public boolean isSystemTable() { return false; }
public boolean isSubstitute() { return false; }
public boolean isSharedTable() { return false; }
public boolean isLocalTable() { return true; }
public boolean isReadOnly() { return localsLocked; }
public SymbolTable getSystemSymbolTable()
{
return systemSymbolTable();
}
public SymbolToken intern(final String text)
{
SymbolToken token = find(text);
if (token == null)
{
if (localsLocked)
{
throw new IonException("Cannot intern into locked (read-only) local symbol table");
}
token = IonManagedBinaryWriter.this.intern(text);
}
return token;
}
public String findKnownSymbol(final int id)
{
for (final SymbolTable table : imports.parents)
{
final String text = table.findKnownSymbol(id);
if (text != null)
{
return text;
}
}
// TODO decide if it is worth making this better than O(N)
// requires more state tracking (but for what use case?)
for (final SymbolToken token : locals.values())
{
if (token.getSid() == id)
{
return token.getText();
}
}
return null;
}
public SymbolToken find(final String text)
{
final SymbolToken token = imports.importedSymbols.get(text);
if (token != null)
{
return token;
}
return locals.get(text);
}
@Override
public void makeReadOnly()
{
localsLocked = true;
}
}
private final IonCatalog catalog;
private final ImportedSymbolContext bootstrapImports;
private ImportedSymbolContext imports;
private final Map locals;
private boolean localsLocked;
private SymbolTable localSymbolTableView;
private final IonRawBinaryWriter symbols;
private final IonRawBinaryWriter user;
private UserState userState;
private SymbolState symbolState;
// local symbol table management for when user writes a local symbol table through us
private long userSymbolTablePosition;
private final List userImports;
private final List userSymbols;
private final ImportDescriptor userCurrentImport;
private boolean forceSystemOutput;
private boolean closed;
/*package*/ IonManagedBinaryWriter(final PrivateIonManagedBinaryWriterBuilder builder,
final OutputStream out)
throws IOException
{
super(builder.optimization);
this.symbols = new IonRawBinaryWriter(
builder.provider,
builder.symbolsBlockSize,
out,
WriteValueOptimization.NONE, // optimization is not relevant for the nested raw writer
StreamCloseMode.NO_CLOSE,
StreamFlushMode.NO_FLUSH,
builder.preallocationMode,
builder.isFloatBinary32Enabled
);
this.user = new IonRawBinaryWriter(
builder.provider,
builder.userBlockSize,
out,
WriteValueOptimization.NONE, // optimization is not relevant for the nested raw writer
StreamCloseMode.CLOSE,
StreamFlushMode.FLUSH,
builder.preallocationMode,
builder.isFloatBinary32Enabled
);
this.catalog = builder.catalog;
this.bootstrapImports = builder.imports;
this.locals = new LinkedHashMap();
this.localsLocked = false;
this.localSymbolTableView = new LocalSymbolTableView();
this.symbolState = SymbolState.SYSTEM_SYMBOLS;
this.forceSystemOutput = false;
this.closed = false;
this.userState = UserState.NORMAL;
this.userSymbolTablePosition = 0L;
this.userImports = new ArrayList();
this.userSymbols = new ArrayList();
this.userCurrentImport = new ImportDescriptor();
// TODO decide if initial LST should survive finish() and seed the next LST
final SymbolTable lst = builder.initialSymbolTable;
if (lst != null)
{
// build import context from seeded LST
final List lstImportList = Arrays.asList(lst.getImportedTables());
// TODO determine if the resolver mode should be configurable for this use case
final ImportedSymbolContext lstImports = new ImportedSymbolContext(ImportedSymbolResolverMode.DELEGATE, lstImportList);
this.imports = lstImports;
// intern all of the local symbols provided from LST
final Iterator symbolIter = lst.iterateDeclaredSymbolNames();
while (symbolIter.hasNext())
{
final String text = symbolIter.next();
intern(text);
}
// TODO determine if we really need to force emitting LST if there are no imports/locals
startLocalSymbolTableIfNeeded(/*writeIVM*/ true);
}
else
{
this.imports = builder.imports;
}
}
// Compatibility with Implementation Writer Interface
public IonCatalog getCatalog()
{
return catalog;
}
public boolean isFieldNameSet()
{
return user.isFieldNameSet();
}
public void writeIonVersionMarker() throws IOException
{
// this has to force a reset of symbol table context
finish();
}
public int getDepth()
{
return user.getDepth();
}
// Symbol Table Management
private void startLocalSymbolTableIfNeeded(final boolean writeIVM) throws IOException
{
if (symbolState == SymbolState.SYSTEM_SYMBOLS)
{
if (writeIVM)
{
symbols.writeIonVersionMarker();
}
symbols.addTypeAnnotationSymbol(systemSymbol(ION_SYMBOL_TABLE_SID));
symbols.stepIn(STRUCT);
{
if (imports.parents.size() > 0)
{
symbols.setFieldNameSymbol(systemSymbol(IMPORTS_SID));
symbols.stepIn(LIST);
for (final SymbolTable st : imports.parents)
{
symbols.stepIn(STRUCT);
{
symbols.setFieldNameSymbol(systemSymbol(NAME_SID));
symbols.writeString(st.getName());
symbols.setFieldNameSymbol(systemSymbol(VERSION_SID));
symbols.writeInt(st.getVersion());
symbols.setFieldNameSymbol(systemSymbol(MAX_ID_SID));
symbols.writeInt(st.getMaxId());
}
symbols.stepOut();
}
symbols.stepOut();
}
}
// XXX no step out
symbolState = SymbolState.LOCAL_SYMBOLS_WITH_IMPORTS_ONLY;
}
}
private void startLocalSymbolTableSymbolListIfNeeded() throws IOException
{
if (symbolState == SymbolState.LOCAL_SYMBOLS_WITH_IMPORTS_ONLY)
{
symbols.setFieldNameSymbol(systemSymbol(SYMBOLS_SID));
symbols.stepIn(LIST);
// XXX no step out
symbolState = SymbolState.LOCAL_SYMBOLS;
}
}
private SymbolToken intern(final String text)
{
if (text == null)
{
return null;
}
try
{
SymbolToken token = imports.importedSymbols.get(text);
if (token != null)
{
if (token.getSid() > ION_1_0_MAX_ID)
{
// using a symbol from an import triggers emitting locals
startLocalSymbolTableIfNeeded(/*writeIVM*/ true);
}
return token;
}
// try the locals
token = locals.get(text);
if (token == null)
{
if (localsLocked)
{
throw new IonException("Local symbol table was locked (made read-only)");
}
// if we got here, this is a new symbol and we better start up the locals
startLocalSymbolTableIfNeeded(/*writeIVM*/ true);
startLocalSymbolTableSymbolListIfNeeded();
token = symbol(text, imports.localSidStart + locals.size());
locals.put(text, token);
symbols.writeString(text);
}
return token;
}
catch (final IOException e)
{
throw new IonException("Error synthesizing symbols", e);
}
}
private SymbolToken intern(final SymbolToken token)
{
if (token == null)
{
return null;
}
final String text = token.getText();
if (text != null)
{
// string content always makes us intern
return intern(text);
}
// no text, we just return what we got
return token;
}
public SymbolTable getSymbolTable()
{
if (symbolState == SymbolState.SYSTEM_SYMBOLS && imports.parents.isEmpty())
{
return Symbols.systemSymbolTable();
}
// TODO this returns a symbol table view that gets truncated across reset boundaries (e.g. IVM/LST definitions)
// we need to figure out, what the actual API contract is, because this *probably* violates the expectation of the caller.
return localSymbolTableView;
}
// Current Value Meta
public void setFieldName(final String name)
{
if (!isInStruct())
{
throw new IllegalStateException("IonWriter.setFieldName() must be called before writing a value into a struct.");
}
if (name == null)
{
throw new NullPointerException("Null field name is not allowed.");
}
final SymbolToken token = intern(name);
user.setFieldNameSymbol(token);
}
public void setFieldNameSymbol(SymbolToken token)
{
token = intern(token);
user.setFieldNameSymbol(token);
}
public void setTypeAnnotations(final String... annotations)
{
if (annotations == null)
{
user.setTypeAnnotationSymbols((SymbolToken[]) null);
}
else
{
final SymbolToken[] tokens = new SymbolToken[annotations.length];
for (int i = 0; i < tokens.length; i++)
{
tokens[i] = intern(annotations[i]);
}
user.setTypeAnnotationSymbols(tokens);
}
}
public void setTypeAnnotationSymbols(final SymbolToken... annotations)
{
if (annotations == null)
{
user.setTypeAnnotationSymbols((SymbolToken[]) null);
}
else
{
for (int i = 0; i < annotations.length; i++)
{
annotations[i] = intern(annotations[i]);
}
user.setTypeAnnotationSymbols(annotations);
}
}
public void addTypeAnnotation(final String annotation)
{
final SymbolToken token = intern(annotation);
user.addTypeAnnotationSymbol(token);
}
// Container Manipulation
public void stepIn(final IonType containerType) throws IOException
{
userState.beforeStepIn(this, containerType);
user.stepIn(containerType);
}
public void stepOut() throws IOException
{
user.stepOut();
userState.afterStepOut(this);
}
public boolean isInStruct()
{
return user.isInStruct();
}
// Write Value Methods
public void writeNull() throws IOException
{
user.writeNull();
}
public void writeNull(final IonType type) throws IOException
{
user.writeNull(type);
}
public void writeBool(final boolean value) throws IOException
{
user.writeBool(value);
}
public void writeInt(long value) throws IOException
{
userState.writeInt(this, value);
user.writeInt(value);
}
public void writeInt(final BigInteger value) throws IOException
{
userState.writeInt(this, value);
user.writeInt(value);
}
public void writeFloat(final double value) throws IOException
{
user.writeFloat(value);
}
public void writeDecimal(final BigDecimal value) throws IOException
{
user.writeDecimal(value);
}
public void writeTimestamp(final Timestamp value) throws IOException
{
user.writeTimestamp(value);
}
public void writeSymbol(String content) throws IOException
{
final SymbolToken token = intern(content);
writeSymbolToken(token);
}
public void writeSymbolToken(SymbolToken token) throws IOException
{
token = intern(token);
if (token != null && token.getSid() == ION_1_0_SID && user.getDepth() == 0 && !user.hasAnnotations())
{
if (user.hasWrittenValuesSinceFinished())
{
// this explicitly translates SID 2 to an IVM and flushes out local symbol state
finish();
}
else
{
// TODO determine if redundant IVM writes need to actually be surfaced
// we need to signal that we need to write out the IVM even if nothing else is written
forceSystemOutput = true;
}
return;
}
user.writeSymbolToken(token);
}
public void writeString(final String value) throws IOException
{
userState.writeString(this, value);
user.writeString(value);
}
public void writeClob(byte[] data) throws IOException
{
user.writeClob(data);
}
public void writeClob(final byte[] data, final int offset, final int length) throws IOException
{
user.writeClob(data, offset, length);
}
public void writeBlob(byte[] data) throws IOException
{
user.writeBlob(data);
}
public void writeBlob(final byte[] data, final int offset, final int length) throws IOException
{
user.writeBlob(data, offset, length);
}
public void writeBytes(byte[] data, int off, int len) throws IOException
{
// this is a raw transfer--we basically have to dump the symbol table since we don't have much context
startLocalSymbolTableIfNeeded(/*writeIVM*/ true);
user.writeBytes(data, off, len);
}
// Stream Terminators
public void flush() throws IOException
{
if (getDepth() == 0 && localsLocked)
{
unsafeFlush();
}
}
private void unsafeFlush() throws IOException
{
if (user.hasWrittenValuesSinceFinished() || forceSystemOutput)
{
// this implies that we have a local symbol table of some sort and the user locked it
symbolState.closeTable(symbols);
}
// make sure that until the local symbol state changes we no-op the table closing routine
symbolState = SymbolState.LOCAL_SYMBOLS_FLUSHED;
forceSystemOutput = false;
// push the data out
symbols.finish();
user.finish();
}
public void finish() throws IOException
{
if (getDepth() != 0)
{
throw new IllegalStateException("IonWriter.finish() can only be called at top-level.");
}
unsafeFlush();
// Reset local symbols
// TODO be more configurable with respect to local symbol table caching
locals.clear();
localsLocked = false;
symbolState = SymbolState.SYSTEM_SYMBOLS;
imports = bootstrapImports;
}
public void close() throws IOException
{
if (closed)
{
return;
}
closed = true;
try
{
finish();
}
catch (IllegalStateException e)
{
// callers do not expect this...
}
finally
{
try
{
symbols.close();
}
finally
{
user.close();
}
}
}
}