001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.isis.core.progmodel.facets.properties.autocomplete;
021
022import java.lang.reflect.Method;
023import java.util.Collections;
024import java.util.List;
025
026import org.apache.isis.core.commons.lang.ObjectExtensions;
027import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
028import org.apache.isis.core.metamodel.adapter.mgr.AdapterManager;
029import org.apache.isis.core.metamodel.adapter.util.AdapterInvokeUtils;
030import org.apache.isis.core.metamodel.facetapi.FacetHolder;
031import org.apache.isis.core.metamodel.facets.ImperativeFacet;
032import org.apache.isis.core.metamodel.facets.ImperativeFacet.Intent;
033import org.apache.isis.core.metamodel.spec.ObjectSpecification;
034import org.apache.isis.core.metamodel.spec.SpecificationLoader;
035import org.apache.isis.core.progmodel.facets.CollectionUtils;
036import org.apache.isis.core.progmodel.facets.param.autocomplete.MinLengthUtil;
037
038public class PropertyAutoCompleteFacetViaMethod extends PropertyAutoCompleteFacetAbstract implements ImperativeFacet {
039
040    private final Method method;
041    private final Class<?> choicesClass;
042    private final int minLength;
043
044    private final AdapterManager adapterManager;
045    private SpecificationLoader specificationLookup;
046
047    public PropertyAutoCompleteFacetViaMethod(final Method method, final Class<?> choicesClass, final FacetHolder holder, final SpecificationLoader specificationLookup, final AdapterManager adapterManager) {
048        super(holder);
049        this.method = method;
050        this.choicesClass = choicesClass;
051        this.specificationLookup = specificationLookup;
052        this.adapterManager = adapterManager;
053        this.minLength = MinLengthUtil.determineMinLength(method);
054    }
055
056    /**
057     * Returns a singleton list of the {@link Method} provided in the
058     * constructor.
059     */
060    @Override
061    public List<Method> getMethods() {
062        return Collections.singletonList(method);
063    }
064
065    @Override
066    public Intent getIntent(final Method method) {
067        return Intent.CHOICES_OR_AUTOCOMPLETE;
068    }
069
070    @Override
071    public int getMinLength() {
072        return minLength;
073    }
074
075    @Override
076    public boolean impliesResolve() {
077        return true;
078    }
079
080    @Override
081    public boolean impliesObjectChanged() {
082        return false;
083    }
084
085    @Override
086    public Object[] autoComplete(ObjectAdapter owningAdapter, String searchArg) {
087        final Object options = AdapterInvokeUtils.invoke(method, owningAdapter, searchArg);
088        if (options == null) {
089            return null;
090        }
091        if (options.getClass().isArray()) {
092            return ObjectExtensions.asArray(options);
093        }
094        final ObjectSpecification specification = specificationLookup.loadSpecification(choicesClass);
095        return CollectionUtils.getCollectionAsObjectArray(options, specification, getAdapterManager());
096    }
097
098    @Override
099    protected String toStringValues() {
100        return "method=" + method + ",class=" + choicesClass;
101    }
102
103    // ////////////////////////////////////////////
104    // Dependencies
105    // ////////////////////////////////////////////
106
107    protected AdapterManager getAdapterManager() {
108        return adapterManager;
109    }
110
111
112}