/**
* 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.mcompat.mfuncs;
import com.foundationdb.server.error.InvalidParameterValueException;
import com.foundationdb.server.types.LazyList;
import com.foundationdb.server.types.TExecutionContext;
import com.foundationdb.server.types.TScalar;
import com.foundationdb.server.types.TOverloadResult;
import com.foundationdb.server.types.common.types.StringAttribute;
import com.foundationdb.server.types.mcompat.mtypes.MNumeric;
import com.foundationdb.server.types.mcompat.mtypes.MString;
import com.foundationdb.server.types.common.types.StringFactory;
import com.foundationdb.server.types.value.ValueSource;
import com.foundationdb.server.types.value.ValueTarget;
import com.foundationdb.server.types.texpressions.TInputSetBuilder;
import com.foundationdb.server.types.texpressions.TScalarBase;
import com.google.common.collect.ObjectArrays;
import java.io.UnsupportedEncodingException;
/**
*
* Implement the length (char_length and octet_length)
*/
public abstract class MLength extends TScalarBase
{
public static final TScalar CHAR_LENGTH = new MLength("CHAR_LENGTH")
{
@Override
protected void doEvaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output)
{
String str = inputs.get(0).getString();
output.putInt32(str.codePointCount(0, str.length()));
}
@Override
public String[] registeredNames() {
return new String[] { "char_length", "charLength" };
}
};
public static final TScalar OCTET_LENGTH = new MBinaryLength("OCTET_LENGTH", 1, "getOctetLength");
public static final TScalar BIT_LENGTH = new MBinaryLength("BIT_LENGTH", 8);
private static class MBinaryLength extends MLength
{
private final int multiplier;
private final String[] aliases;
private MBinaryLength(String name, int multiplier, String... aliases) {
super(name);
this.multiplier = multiplier;
this.aliases = ObjectArrays.concat(aliases, name);
}
@Override
protected void doEvaluate(TExecutionContext context, LazyList<? extends ValueSource> inputs, ValueTarget output)
{
int charsetId = context.inputTypeAt(0).attribute(StringAttribute.CHARSET);
String charset = (StringFactory.Charset.values())[charsetId].name();
try
{
int length = (inputs.get(0).getString()).getBytes(charset).length;
length *= multiplier;
output.putInt32(length);
}
catch (UnsupportedEncodingException ex) // impossible to happen
{
context.warnClient(new InvalidParameterValueException("Unknown CHARSET: " + charset));
output.putNull();
}
}
@Override
public String[] registeredNames() {
return aliases;
}
}
private final String name;
private MLength (String name)
{
this.name = name;
}
@Override
protected void buildInputSets(TInputSetBuilder builder)
{
builder.covers(MString.VARCHAR, 0);
}
@Override
public String displayName()
{
return name;
}
@Override
public TOverloadResult resultType()
{
return TOverloadResult.fixed(MNumeric.INT, 10);
}
}