biz.c24.io.spring.integration.selector.AbstractXPathMessageSelector.java Source code

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Here is the source code for biz.c24.io.spring.integration.selector.AbstractXPathMessageSelector.java

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/*
 * Copyright 2011 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
 *
 *         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 biz.c24.io.spring.integration.selector;

import org.springframework.messaging.Message;
import org.springframework.messaging.MessagingException;
import org.springframework.integration.core.MessageSelector;
import org.springframework.util.Assert;
import org.springframework.xml.xpath.XPathException;

import biz.c24.io.api.data.ComplexDataObject;
import biz.c24.io.api.data.IOXPath;
import biz.c24.io.api.data.IOXPathException;
import biz.c24.io.api.data.IOXPathFactory;
import biz.c24.io.api.data.XPathStatement;

/**
 * @author askogman
 * 
 */
public abstract class AbstractXPathMessageSelector implements MessageSelector {

    XPathStatement statement;

    public AbstractXPathMessageSelector(String statement) {
        Assert.notNull(statement, "The XPath statement must not be null.");

        this.statement = new XPathStatement(statement);
    }

    public AbstractXPathMessageSelector(XPathStatement statement) {
        Assert.notNull(statement, "The XPath statement must not be null.");

        this.statement = statement;
    }

    protected IOXPath createXPath() throws IOXPathException {
        return IOXPathFactory.getInstance(statement);
    }

    final public boolean accept(Message<?> message) {
        Object payload = message.getPayload();

        ComplexDataObject cdo;
        try {
            cdo = (ComplexDataObject) payload;
        } catch (ClassCastException e) {
            throw new MessagingException("Cannot evaluate payload of type [" + payload.getClass().getName()
                    + "]. Only ComplexDataObject is supported.", e);
        }

        try {
            return doAcceptPayload(cdo);
        } catch (IOXPathException e) {
            throw new XPathException("Exception thrown trying to evaluate [" + statement + "]", e);
        }
    }

    abstract protected boolean doAcceptPayload(ComplexDataObject payload) throws IOXPathException;

}