org.springframework.integration.selector.PayloadTypeSelector.java Source code

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Here is the source code for org.springframework.integration.selector.PayloadTypeSelector.java

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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.integration.selector;

import java.util.ArrayList;
import java.util.List;

import org.springframework.integration.core.MessageSelector;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;

/**
 * A {@link MessageSelector} implementation that checks the type of the
 * {@link Message} payload. The payload type must be assignable to at least one
 * of the selector's accepted types.
 *
 * @author Mark Fisher
 */
public class PayloadTypeSelector implements MessageSelector {

    private final List<Class<?>> acceptedTypes = new ArrayList<Class<?>>();

    /**
     * Create a selector for the provided types. At least one is required.
     *
     * @param types The types.
     */
    public PayloadTypeSelector(Class<?>... types) {
        Assert.notEmpty(types, "at least one type is required");
        for (Class<?> type : types) {
            this.acceptedTypes.add(type);
        }
    }

    @Override
    public boolean accept(Message<?> message) {
        Assert.notNull(message, "'message' must not be null");
        Object payload = message.getPayload();
        Assert.notNull(payload, "'payload' must not be null");
        for (Class<?> type : this.acceptedTypes) {
            if (type.isAssignableFrom(payload.getClass())) {
                return true;
            }
        }
        return false;
    }

}