/
NullFilter.java
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/
NullFilter.java
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/*
* Copyright 2016 hbz
*
* 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 org.metafacture.mangling;
import org.metafacture.framework.FluxCommand;
import org.metafacture.framework.StreamReceiver;
import org.metafacture.framework.annotations.Description;
import org.metafacture.framework.annotations.In;
import org.metafacture.framework.annotations.Out;
import org.metafacture.framework.helpers.ForwardingStreamPipe;
/**
* Replaces null values with replacement string, or, if replacement
* string is null (default), discards null values entirely.
*
* @author Jens Wille
*
*/
@Description("Discards or replaces null values")
@In(StreamReceiver.class)
@Out(StreamReceiver.class)
@FluxCommand("filter-null-values")
public final class NullFilter extends ForwardingStreamPipe {
private String replacement;
/**
* Creates an instance of {@link NullFilter}.
*/
public NullFilter() {
}
/**
* Sets the replacement.
*
* @param replacement the replacement
*/
public void setReplacement(final String replacement) {
this.replacement = replacement;
}
/**
* Gets the replacement or null.
*
* @return the replacement or null
*/
public String getReplacement() {
return replacement;
}
@Override
public void literal(final String name, final String value) {
if (value != null) {
getReceiver().literal(name, value);
}
else if (replacement != null) {
getReceiver().literal(name, replacement);
}
}
}