com.zaradai.bloodstone.model.digester.DigesterBloodstoneLoader.java Source code

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Here is the source code for com.zaradai.bloodstone.model.digester.DigesterBloodstoneLoader.java

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/**
 * Copyright 2014 Zaradai
 *
 * 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 com.zaradai.bloodstone.model.digester;

import com.google.inject.Inject;
import com.zaradai.bloodstone.model.BloodstoneLoader;
import com.zaradai.bloodstone.model.ModelException;
import com.zaradai.bloodstone.model.generated.Bloodstone;
import com.zaradai.bloodstone.model.validation.ConfigValidator;
import org.apache.commons.digester3.Digester;
import org.apache.commons.digester3.binder.DigesterLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.SAXException;

import java.io.IOException;
import java.io.InputStream;

public class DigesterBloodstoneLoader implements BloodstoneLoader {
    private static final Logger LOGGER = LoggerFactory.getLogger(DigesterBloodstoneLoader.class);

    private final ConfigValidator validator;

    @Inject
    DigesterBloodstoneLoader(ConfigValidator validator) {
        this.validator = validator;
    }

    @Override
    public Bloodstone load(String sourceUri) throws ModelException {
        Bloodstone res;
        InputStream inputStream = getStream(sourceUri);
        Digester digester = getDigester();

        try {
            res = digester.parse(inputStream);
        } catch (SAXException e) {
            throw new ModelException("Unable to load config file", e);
        } catch (IOException e) {
            throw new ModelException("Unable to parse config file", e);
        }
        // do validation if provided
        if (validator != null) {
            validator.validate(res);
        } else {
            LOGGER.info("Configuration not validated");
        }

        return res;
    }

    protected Digester getDigester() {
        DigesterLoader loader = DigesterLoader.newLoader(new BloodstoneModule());

        return loader.newDigester();
    }

    protected InputStream getStream(String sourceUri) {
        return DigesterBloodstoneLoader.class.getClassLoader().getResourceAsStream(sourceUri);
    }
}