NestedFormFieldValueProcessor.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.kie.workbench.common.forms.dynamic.backend.server.context.generation.dynamic.impl.fieldProcessors;

import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConstructorUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.kie.workbench.common.forms.dynamic.service.context.generation.dynamic.BackendFormRenderingContext;
import org.kie.workbench.common.forms.dynamic.service.context.generation.dynamic.FieldValueProcessor;
import org.kie.workbench.common.forms.dynamic.service.context.generation.dynamic.FormValuesProcessor;
import org.kie.workbench.common.forms.dynamic.service.shared.impl.MapModelRenderingContext;
import org.kie.workbench.common.forms.model.FieldDefinition;
import org.kie.workbench.common.forms.model.FormDefinition;
import org.slf4j.Logger;

public abstract class NestedFormFieldValueProcessor<F extends FieldDefinition, RAW_VALUE, FLAT_VALUE> implements FieldValueProcessor<F, RAW_VALUE, FLAT_VALUE> {

    protected FormValuesProcessor processor;

    public abstract Logger getLogger();

    public void init(FormValuesProcessor processor) {
        this.processor = processor;
    }

    protected void prepareNestedRawValues(final Map<String, Object> valuesMap,
                                          final FormDefinition nestedForm,
                                          final Object value) {
        nestedForm.getFields().forEach(field -> {
            if (!valuesMap.containsKey(field.getBinding())) {
                valuesMap.put(field.getBinding(),
                              readValue(field.getBinding(),
                                        value));
            }
        });
    }

    protected Object writeObjectValues(Object originalValue,
                                       Map<String, Object> formValues,
                                       FieldDefinition field,
                                       BackendFormRenderingContext context) {
        if (originalValue != null && originalValue.getClass().getName().equals(field.getStandaloneClassName())) {
            writeValues(formValues,
                        originalValue);
        } else {
            Class clazz = null;
            try {
                clazz = context.getClassLoader().loadClass(field.getStandaloneClassName());
            } catch (ClassNotFoundException e) {
                // Maybe the nested class it is not on the classLoader context... let's try on the app classloader
                try {
                    clazz = Class.forName(field.getStandaloneClassName());
                } catch (ClassNotFoundException e1) {
                    getLogger().warn("Unable to find class '{}' on classLoader for field '{}'",
                                     field.getStandaloneClassName(),
                                     field.getBinding());
                }
            }
            if (clazz != null) {
                originalValue = writeValues(formValues,
                                            clazz);
            }
        }
        return originalValue;
    }

    protected Object writeValues(Map<String, Object> values,
                                 Class clazz) {
        try {
            Object value = ConstructorUtils.invokeConstructor(clazz,
                                                              null);
            writeValues(values,
                        value);
            return value;
        } catch (Exception e) {
            getLogger().warn("Unable to create instance for class {}: ",
                             clazz.getName());
        }
        return null;
    }

    protected void writeValues(Map<String, Object> values,
                               Object model) {
        if (model == null) {
            return;
        }
        values.forEach((property, value) -> {
            try {
                if (property.equals(MapModelRenderingContext.FORM_ENGINE_OBJECT_IDX) || property.equals(
                        MapModelRenderingContext.FORM_ENGINE_EDITED_OBJECT)) {
                    return;
                }
                if (PropertyUtils.getPropertyDescriptor(model,
                                                        property) != null) {
                    BeanUtils.setProperty(model,
                                          property,
                                          value);
                }
            } catch (Exception e) {
                getLogger().warn("Error modifying object '{}': cannot set value '{}' to property '{}'",
                                 model,
                                 value,
                                 property);
                getLogger().warn("Caused by:",
                                 e);
            }
        });
    }

    protected Object readValue(String property,
                               Object model) {
        try {
            if (PropertyUtils.getPropertyDescriptor(model,
                                                    property) != null) {
                return PropertyUtils.getProperty(model,
                                                 property);
            }
        } catch (Exception e) {
            getLogger().warn("Error getting property '{}' from object '{}'",
                             property,
                             model);
            getLogger().warn("Caused by:",
                             e);
        }
        return null;
    }
}