com.cloudera.nav.sdk.client.writer.registry.MPropertyEntry.java Source code

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Here is the source code for com.cloudera.nav.sdk.client.writer.registry.MPropertyEntry.java

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/*
 * Copyright (c) 2015 Cloudera, Inc.
 *
 * 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.cloudera.nav.sdk.client.writer.registry;

import com.cloudera.nav.sdk.model.annotations.MProperty;
import com.google.common.base.Throwables;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.lang.StringUtils;

/**
 * Registry entry for a particular instance of the @MProperty annotation
 */
public class MPropertyEntry {

    private final String attribute;
    private final Field field;
    private final Method getter;
    private final MProperty ann;

    public MPropertyEntry(Field field, Method getter) {
        ann = field.getAnnotation(MProperty.class);
        String attr = ann.attribute();
        this.attribute = StringUtils.isEmpty(attr) ? field.getName() : attr;
        this.field = field;
        this.getter = getter;
    }

    /**
     * @return Name of the metadata field
     */
    public String getAttribute() {
        return attribute;
    }

    /**
     * @return the Field that is associated with the @MProperty annotation
     */
    public Field getField() {
        return field;
    }

    /**
     * @return Getter method that takes no parameters and return the value
     */
    public Method getReadMethod() {
        return getter;
    }

    /**
     * @return the @MProperty annotation associated with this field
     */
    public MProperty getAnnotation() {
        return ann;
    }

    /**
     * Get the attribute field value
     *
     * @param mClassObj
     * @return
     */
    public Object getValue(Object mClassObj) {
        try {
            return getter.invoke(mClassObj);
        } catch (IllegalAccessException e) {
            throw Throwables.propagate(e);
        } catch (InvocationTargetException e) {
            throw Throwables.propagate(e);
        }
    }

    /**
     * @return whether this is a required property
     */
    public boolean required() {
        return ann.required();
    }
}