io.wcm.devops.conga.generator.util.AbstractConfigurableObjectTreeProcessor.java Source code

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Here is the source code for io.wcm.devops.conga.generator.util.AbstractConfigurableObjectTreeProcessor.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2015 wcm.io
 * %%
 * 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.
 * #L%
 */
package io.wcm.devops.conga.generator.util;

import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.lang3.StringUtils;

import io.wcm.devops.conga.model.shared.Configurable;

/**
 * Iterates over all {@link Configurable} items in the object tree.
 * @param <T> Payload for processor
 */
abstract class AbstractConfigurableObjectTreeProcessor<T> {

    /**
     * Iterator over object tree an visit all {@link Configurable} instances. Payload
     * can be inherited from down the hierarchy levels.
     * @param object Root object of object tree
     */
    protected void process(Object object, ConfigurableProcessor<T> processor, T parentPayload) {
        if (object instanceof Map) {
            for (Object child : ((Map) object).values()) {
                process(child, processor, parentPayload);
            }
            return;
        }
        if (object instanceof List) {
            for (Object child : (List) object) {
                process(child, processor, parentPayload);
            }
            return;
        }
        T payload;
        if (object instanceof Configurable) {
            Configurable configurable = (Configurable) object;
            payload = processor.process(configurable, parentPayload);
        } else {
            payload = parentPayload;
        }
        resolveNestedObjects(object, processor, payload);
    }

    private void resolveNestedObjects(Object object, ConfigurableProcessor<T> processor, T parentPayload) {
        if (object == null || object.getClass().isEnum()) {
            return;
        }
        try {
            Map<String, String> description = BeanUtils.describe(object);
            for (String propertyName : description.keySet()) {
                Object propertyValue = PropertyUtils.getProperty(object, propertyName);
                if (!StringUtils.equals(propertyName, "class")) {
                    process(propertyValue, processor, parentPayload);
                }
            }
        } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException ex) {
            throw new RuntimeException("Unable to get bean properties from '" + object.getClass().getName() + "'.",
                    ex);
        }
    }

}