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/*
 * Copyright 2017-2018 Michael Hoffer . All rights reserved.
 * Copyright 2017-2018 Goethe Center for Scientific Computing, University Frankfurt. All rights reserved.
 *
 * 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.
 *
 * If you use this software for scientific research then please cite the following publication(s):
 *
 * M. Hoffer, C. Poliwoda, & G. Wittum. (2013). Visual reflection library:
 * a framework for declarative GUI programming on the Java platform.
 * Computing and Visualization in Science, 2013, 16(4),
 * 181–192. http://doi.org/10.1007/s00791-014-0230-y
 */
package eu.mihosoft.vmf.vmftext.grammar;

import eu.mihosoft.vcollections.VList;
import eu.mihosoft.vcollections.VListChange;
import eu.mihosoft.vmf.runtime.core.DelegatedBehavior;
import vjavax.observer.collection.CollectionChangeEvent;
import vjavax.observer.collection.CollectionChangeListener;

import java.util.ArrayList;
import java.util.Objects;

public class CheckRulesDelegate implements DelegatedBehavior {
    GrammarModel caller;

    @Override
    public void setCaller(GrammarModel caller) {
        this.caller = caller;
    }

    public void onGrammarModelInstantiated() {
        caller.getRuleClasses().addChangeListener(new CollectionChangeListener, VListChange>() {
            @Override
            public void onChange(CollectionChangeEvent, VListChange> evt) {

                // remove duplicate properties
                for(RuleClass p1 : evt.added().elements()) {
                    for(RuleClass p2 : new ArrayList<>(evt.source())) {
                        if(p1!=p2 && Objects.equals(p1.getName(),p2.getName())) {
                            evt.source().remove(p1);
                            System.err.println("ERROR: duplicate rule classes '"+p1.getName()+"'!");
                        }
                    }
                }
            }
        });
    }

}