net.anwiba.commons.lang.visitor.ClosurVisitor Maven / Gradle / Ivy
/*
* #%L
* anwiba commons core
* %%
* Copyright (C) 2007 - 2016 Andreas Bartels
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 2.1 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
package net.anwiba.commons.lang.visitor;
import java.util.HashMap;
import java.util.Map;
import net.anwiba.commons.lang.functional.IClosure;
public class ClosurVisitor implements IVisitor> {
private final Map> closure = new HashMap<>();
private IClosure defaultClosure = null;
public ClosurVisitor() {
}
@Override
public ClosurVisitor ifCase(final IClosure function, @SuppressWarnings("unchecked") final K... keys) {
for (final K key : keys) {
this.closure.put(key, function);
}
return this;
};
@Override
public ClosurVisitor defaultCase(final IClosure function) {
this.defaultClosure = function;
return this;
};
public O accept(final K key) throws E {
if (this.closure.containsKey(key)) {
return this.closure.get(key).execute();
}
return this.defaultClosure == null ? null : this.defaultClosure.execute();
}
}
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