/**
* 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.types.LazyList;
import com.foundationdb.server.types.TClass;
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.TBinary;
import com.foundationdb.server.types.texpressions.TInputSetBuilder;
import com.foundationdb.server.types.texpressions.TScalarBase;
import com.foundationdb.server.types.common.types.TString;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
import com.foundationdb.util.Strings;
import com.google.common.primitives.Ints;
import java.nio.charset.Charset;
import java.util.List;
public class Hex
{
private Hex() {
}
private static final String HEX_NAME = "HEX";
private static Charset getCharset(TInstance type) {
return Charset.forName(StringAttribute.charsetName(type));
}
public static final TScalar[] create(final TString stringType, final TClass longType, final TBinary binaryType) {
TScalar hex_string = new TScalarBase()
{
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.covers(stringType, 0);
}
@Override
protected void doEvaluate(TExecutionContext context,
LazyList<? extends ValueSource> inputs,
ValueTarget output) {
Charset charset = getCharset(context.inputTypeAt(0));
String s = inputs.get(0).getString();
byte[] bytes = s.getBytes(charset);
output.putString(Strings.hex(bytes), null);
}
@Override
public String displayName() {
return HEX_NAME;
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.custom(new TCustomOverloadResult() {
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context) {
TInstance type = inputs.get(0).type();
int maxLen = type.attribute(StringAttribute.MAX_LENGTH);
Charset charset = getCharset(type);
long maxBytes = (long)Math.ceil(maxLen * charset.newEncoder().maxBytesPerChar());
long maxHexLength = maxBytes * 2;
return stringType.instance(Ints.saturatedCast(maxHexLength), anyContaminatingNulls(inputs));
}
});
}
};
TScalar hex_bigint = new TScalarBase()
{
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.covers(longType, 0);
}
@Override
protected void doEvaluate(TExecutionContext context,
LazyList<? extends ValueSource> inputs,
ValueTarget output) {
long value = inputs.get(0).getInt64();
output.putString(Long.toHexString(value).toUpperCase(), null);
}
@Override
public String displayName() {
return HEX_NAME;
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.custom(new TCustomOverloadResult() {
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context) {
// 16 = BIGINT size * 2
return stringType.instance(16, anyContaminatingNulls(inputs));
}
});
}
};
TScalar hex_binary = new TScalarBase()
{
@Override
protected void buildInputSets(TInputSetBuilder builder) {
builder.covers(binaryType, 0);
}
@Override
protected void doEvaluate(TExecutionContext context,
LazyList<? extends ValueSource> inputs,
ValueTarget output) {
byte[] bytes = inputs.get(0).getBytes();
output.putString(Strings.hex(bytes), null);
}
@Override
public String displayName() {
return HEX_NAME;
}
@Override
public TOverloadResult resultType() {
return TOverloadResult.custom(new TCustomOverloadResult() {
@Override
public TInstance resultInstance(List<TPreptimeValue> inputs, TPreptimeContext context) {
int length = inputs.get(0).type().attribute(TBinary.Attrs.LENGTH);
return stringType.instance(Ints.saturatedCast(length * 2), anyContaminatingNulls(inputs));
}
});
}
};
return new TScalar[] { hex_string, hex_bigint, hex_binary };
}
}