/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.server.types.common.funcs;
import com.foundationdb.server.error.InvalidParameterValueException;
import com.foundationdb.server.types.LazyList;
import com.foundationdb.server.types.TCustomOverloadResult;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TOverloadResult;
import com.foundationdb.server.types.TPreptimeContext;
import com.foundationdb.server.types.TPreptimeValue;
import com.foundationdb.server.types.TScalar;
import com.foundationdb.server.types.common.types.StringAttribute;
import com.foundationdb.server.types.common.types.StringFactory;
import com.foundationdb.server.types.common.types.TBinary;
import com.foundationdb.server.types.common.types.TString;
import com.foundationdb.server.types.texpressions.TInputSetBuilder;
import com.foundationdb.server.types.texpressions.TScalarBase;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
import com.foundationdb.util.Strings;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.List;
public class Base64
{
private Base64() {
}
public static final TScalar[] create(final TString varchar, final TBinary varbinary) {
TScalar binary_to_base64 = new TScalarBase()
{
@Override
public String displayName() {
return "TO_BASE64";
}
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.covers(varbinary, 0);
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.custom(new TCustomOverloadResult() {
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context) {
TInstance inputType = inputs.get(0).type();
int binaryLength = inputType.attribute(TBinary.Attrs.LENGTH);
int base64Length = (binaryLength * 4 + 2) / 3; // round up for ='s
return varchar.instance(base64Length, inputType.nullability());
}
});
}
@Override
protected void doEvaluate(TExecutionContext context,
LazyList<? extends ValueSource> inputs,
ValueTarget output) {
byte[] binary = inputs.get(0).getBytes();
output.putString(Strings.toBase64(binary), null);
}
};
TScalar string_to_base64 = new TScalarBase()
{
@Override
public String displayName() {
return "TO_BASE64";
}
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.covers(varchar, 0);
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.custom(new TCustomOverloadResult() {
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context) {
TInstance inputType = inputs.get(0).type();
int stringLength = inputType.attribute(StringAttribute.MAX_LENGTH);
int encodedLength = (int)Math.ceil(stringLength * Charset.forName(StringFactory.Charset.of(inputType.attribute(StringAttribute.CHARSET))).newEncoder().maxBytesPerChar());
int base64Length = (encodedLength * 4 + 2) / 3; // round up for ='s
return varchar.instance(base64Length, inputType.nullability());
}
});
}
@Override
protected void doEvaluate(TExecutionContext context,
LazyList<? extends ValueSource> inputs,
ValueTarget output) {
String charset = StringFactory.Charset.of(context.inputTypeAt(0).attribute(StringAttribute.CHARSET));
String string = inputs.get(0).getString();
try {
byte[] binary = string.getBytes(charset);
output.putString(Strings.toBase64(binary), null);
}
catch (UnsupportedEncodingException ex)
{
context.warnClient(new InvalidParameterValueException("Unknown CHARSET: " + charset));
output.putNull();
}
}
};
TScalar from_base64 = new TScalarBase()
{
@Override
public String displayName() {
return "FROM_BASE64";
}
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.covers(varchar, 0);
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.custom(new TCustomOverloadResult() {
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context) {
TInstance inputType = inputs.get(0).type();
int stringLength = inputType.attribute(StringAttribute.MAX_LENGTH);
int binaryLength = stringLength / 4 * 3;
return varbinary.instance(binaryLength, inputType.nullability());
}
});
}
@Override
protected void doEvaluate(TExecutionContext context,
LazyList<? extends ValueSource> inputs,
ValueTarget output) {
String base64 = inputs.get(0).getString();
output.putBytes(Strings.fromBase64(base64));
}
};
return new TScalar[] { binary_to_base64, string_to_base64, from_base64 };
}
}