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ArangoDB Java Driver
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/*
 * DISCLAIMER
 *
 * Copyright 2016 ArangoDB GmbH, Cologne, Germany
 *
 * 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.
 *
 * Copyright holder is ArangoDB GmbH, Cologne, Germany
 */

package com.arangodb.internal;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import com.arangodb.ArangoDBException;
import com.arangodb.entity.DocumentField;
import com.arangodb.entity.DocumentField.Type;

/**
 * @author Mark - mark at arangodb.com
 *
 */
public class DocumentCache {

	private final Map, Map> cache;

	public DocumentCache() {
		super();
		cache = new HashMap, Map>();
	}

	public void setValues(final Object doc, final Map values) throws ArangoDBException {
		try {
			final Map fields = getFields(doc.getClass());
			for (final Entry value : values.entrySet()) {
				final Field field = fields.get(value.getKey());
				if (field != null) {
					field.set(doc, value.getValue());
				}
			}
		} catch (final IllegalArgumentException e) {
			throw new ArangoDBException(e);
		} catch (final IllegalAccessException e) {
			throw new ArangoDBException(e);
		}
	}

	private Map getFields(final Class clazz) {
		Map fields = new HashMap();
		if (!isTypeRestricted(clazz)) {
			fields = cache.get(clazz);
			if (fields == null) {
				fields = createFields(clazz);
				cache.put(clazz, fields);
			}
		}
		return fields;
	}

	private boolean isTypeRestricted(final Class type) {
		return Map.class.isAssignableFrom(type) || Collection.class.isAssignableFrom(type);
	}

	private Map createFields(final Class clazz) {
		final Map fields = new HashMap();
		Class tmp = clazz;
		final Collection values = new ArrayList(
				Arrays.asList(DocumentField.Type.values()));
		while (tmp != null && tmp != Object.class && values.size() > 0) {
			final Field[] declaredFields = tmp.getDeclaredFields();
			for (int i = 0; i < declaredFields.length && values.size() > 0; i++) {
				findAnnotation(values, fields, declaredFields[i]);
			}
			tmp = tmp.getSuperclass();
		}
		return fields;
	}

	private void findAnnotation(
		final Collection values,
		final Map fields,
		final Field field) {
		final DocumentField annotation = field.getAnnotation(DocumentField.class);
		if (annotation != null && !field.isSynthetic() && !Modifier.isStatic(field.getModifiers())
				&& String.class.isAssignableFrom(field.getType())) {
			final Type value = annotation.value();
			if (values.contains(value)) {
				field.setAccessible(true);
				fields.put(value, field);
				values.remove(value);
			}
		}
	}
}