/
LiteralToObject.java
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/
LiteralToObject.java
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/*
* Copyright 2016 Christoph Böhme
*
* 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.ObjectReceiver;
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.DefaultStreamPipe;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Emits the values of literals matching {@literal #setPattern(String)}
* as objects.
* <p>
* The matcher does only match the literal name and does not
* take the enclosing entities into account.
*
* @author Christoph Böhme
*
*/
@Description("Emits literal values as objects.")
@In(StreamReceiver.class)
@Out(String.class)
@FluxCommand("literal-to-object")
public final class LiteralToObject extends DefaultStreamPipe<ObjectReceiver<String>> {
/**
* Default value for {@link #setPattern(String)}.
*/
public static final java.lang.String DEFAULT_PATTERN = ".*";
private Matcher matcher = Pattern.compile(DEFAULT_PATTERN).matcher("");
/**
* Creates an instance of {@link LiteralToObject}.
*/
public LiteralToObject() {
}
/**
* Sets the pattern against which literal names are matched. Only the
* values of matching literals are converted into objects.
* <p>
* The parameter can be changed at any time during processing. It becomes
* effective with the next literal being processed.
* <p>
* The default pattern matches all literal names including empty ones.
*
* @param pattern a Java regular expression
*/
public void setPattern(final String pattern) {
this.matcher = Pattern.compile(pattern).matcher("");
}
/**
* Gets the pattern against which literal names are matched.
*
* @return the pattern
*/
public String getPattern() {
return matcher.pattern().pattern();
}
@Override
public void literal(final String name, final String value) {
assert !isClosed();
matcher.reset(name);
if (matcher.matches()) {
getReceiver().process(value);
}
}
}