org.apache.camel.support.SupplierRegistry Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.camel.support;

import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import java.util.function.Supplier;

import org.apache.camel.NoSuchBeanException;

/**
 * Used for storing beans that are supplied via a {@link Supplier}.
 * 
 * Camel will cache the result from the supplier from first lookup (singleton scope). If you do not need cached then use
 * {@link #bindAsPrototype(String, Class, Supplier)} instead.
 *
 * To bind a bean as a supplier, then use the {@link org.apache.camel.spi.Registry#bind(String, Class, Supplier)}
 * method.
 */
public class SupplierRegistry extends SimpleRegistry {

    @Override
    public  T lookupByNameAndType(String name, Class type) {
        Map, Object> map = this.get(name);
        if (map == null) {
            return null;
        }

        Object answer = map.get(type);
        if (answer instanceof Supplier supplier) {
            // okay then eval the supplier to get the actual value
            answer = supplier.get();
        }
        if (answer == null) {
            // no direct type match then check if assignable
            for (Map.Entry, Object> entry : map.entrySet()) {
                if (type.isAssignableFrom(entry.getKey())) {
                    Object value = entry.getValue();
                    if (value instanceof Supplier supplier) {
                        // okay then eval the supplier to get the actual value
                        value = supplier.get();
                    }
                    answer = value;
                    break;
                }
            }
        }
        if (answer == null) {
            // okay fallback to check all entries that are unassigned type (java.lang.Object)
            for (Map.Entry, Object> entry : map.entrySet()) {
                if (Object.class == entry.getKey()) {
                    Object value = entry.getValue();
                    if (value instanceof Supplier supplier) {
                        // okay then eval the supplier to get the actual value
                        value = supplier.get();
                    }
                    if (type.isInstance(value)) {
                        answer = value;
                        break;
                    }
                }
            }
        }
        if (answer == null) {
            return null;
        }
        try {
            answer = unwrap(answer);
            return type.cast(answer);
        } catch (Exception e) {
            String msg = "Found bean: " + name + " in SupplierRegistry: " + this
                         + " of type: " + answer.getClass().getName() + " expected type was: " + type;
            throw new NoSuchBeanException(name, msg, e);
        }
    }

    @Override
    public  Set findByType(Class type) {
        Set result = new LinkedHashSet<>();
        for (Map.Entry, Object>> entry : entrySet()) {
            for (Map.Entry, Object> subEntry : entry.getValue().entrySet()) {
                if (type.isAssignableFrom(subEntry.getKey())) {
                    Object value = subEntry.getValue();
                    if (value instanceof Supplier supplier) {
                        // okay then eval the supplier to get the actual value
                        value = supplier.get();
                    }
                    result.add(type.cast(value));
                }
            }
        }
        return result;
    }

    @Override
    public  Map findByTypeWithName(Class type) {
        Map result = new LinkedHashMap<>();
        for (Map.Entry, Object>> entry : entrySet()) {
            for (Map.Entry, Object> subEntry : entry.getValue().entrySet()) {
                if (type.isAssignableFrom(subEntry.getKey())) {
                    Object value = subEntry.getValue();
                    if (value instanceof Supplier supplier) {
                        // okay then eval the supplier to get the actual value
                        value = supplier.get();
                    }
                    result.put(entry.getKey(), type.cast(value));
                }
            }
        }
        return result;
    }

    @Override
    public void bind(String id, Class type, Supplier