com.phloc.commons.combine.CombinatorStringIgnoreNull Maven / Gradle / Ivy
/**
* Copyright (C) 2006-2015 phloc systems
* http://www.phloc.com
* office[at]phloc[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 com.phloc.commons.combine;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import com.phloc.commons.string.ToStringGenerator;
/**
* A simple combinator that concatenates 2 strings by ignoring null
* values.
*
* @author Philip Helger
*/
@Immutable
public final class CombinatorStringIgnoreNull implements ICombinator
{
private static final CombinatorStringIgnoreNull s_aInstance = new CombinatorStringIgnoreNull ();
private CombinatorStringIgnoreNull ()
{}
@Nullable
public String combine (@Nullable final String sFirst, @Nullable final String sSecond)
{
if (sFirst == null)
return sSecond;
if (sSecond == null)
return sFirst;
return sFirst + sSecond;
}
@Override
public String toString ()
{
return new ToStringGenerator (this).toString ();
}
@Nonnull
public static CombinatorStringIgnoreNull getInstance ()
{
return s_aInstance;
}
}