/**
* Copyright (C) 2015 Valkyrie RCP
*
* 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.valkyriercp.rules.closure.support;
import org.valkyriercp.rules.closure.Closure;
import org.valkyriercp.rules.constraint.Constraint;
/**
* Only execute the specified closure if a provided constraint is also true.
*
* @author Keith Donald
*/
public class IfBlock extends Block {
private static final long serialVersionUID = 1L;
/**
* Block of code to execute if object passes test.
*/
private Closure closure;
/**
* Constraint to test against.
*/
private Constraint constraint;
/**
* Constructor.
*
* @param constraint Constraint to test against.
* @param closure closure to be executed if object passes the test.
*/
public IfBlock(Constraint constraint, Closure closure) {
this.constraint = constraint;
this.closure = closure;
}
/**
* Only invoke the wrapped closure against the provided argument if the
* constraint permits, else take no action.
*/
protected void handle(Object argument) {
if (constraint.test(argument)) {
closure.call(argument);
}
}
}