/**
 *  Copyright 2012-2017 Gunnar Morling (http://www.gunnarmorling.de/)
 *  and/or other contributors as indicated by the @authors tag. See the
 *  copyright.txt file in the distribution for a full listing of all
 *  contributors.
 *
 *  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.mapstruct.ap.internal.model.assignment;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.mapstruct.ap.internal.model.common.Type;

/**
 * This wrapper handles the situation were an assignment must be done via a target getter method because there
 * is no setter available.
 *
 * The wrapper checks if there is an collection or map initialized on the target bean (not null). If so it uses the
 * addAll (for collections) or putAll (for maps). The collection / map is cleared in case of a pre-existing target
 * {@link org.mapstruct.MappingTarget }before adding the source entries. The goal is that the same collection / map
 * is used as target.
 *
 * Nothing can be added if the getter on the target returns null.
 *
 * @author Sjaak Derksen
 */
public class GetterWrapperForCollectionsAndMaps extends WrapperForCollectionsAndMaps {

    /**
     * @param decoratedAssignment source RHS
     * @param thrownTypesToExclude set of types to exclude from re-throwing
     * @param targetType the target type
     * @param fieldAssignment true when this the assignment is to a field rather than via accessors
     */
    public GetterWrapperForCollectionsAndMaps(Assignment decoratedAssignment,
                                              List<Type> thrownTypesToExclude,
                                              Type targetType,
                                              boolean fieldAssignment) {

        super(
            decoratedAssignment,
            thrownTypesToExclude,
            targetType,
            fieldAssignment
        );
    }

    @Override
    public Set<Type> getImportTypes() {
        Set<Type> imported = new HashSet<Type>( super.getImportTypes() );
        if ( getSourcePresenceCheckerReference() == null ) {
            imported.addAll( getNullCheckLocalVarType().getImportTypes() );
        }
        return imported;
    }
}