com.netflix.astyanax.util.StringUtils.java Source code

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Here is the source code for com.netflix.astyanax.util.StringUtils.java

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/*******************************************************************************
 * Copyright 2011 Netflix
 * 
 * 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.netflix.astyanax.util;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Collections2;

public class StringUtils {
    /**
     * Convert a string from "_" delimited to lower camel case
     * 
     * @param s
     * @return
     */
    public static String toCamelCase(String s) {
        String[] parts = s.split("_");
        StringBuilder sb = new StringBuilder();
        for (String part : parts) {
            if (sb.length() == 0)
                sb.append(part.toLowerCase());
            else
                sb.append(toProperCase(part));
        }
        return sb.toString();
    }

    public static String toProperCase(String s) {
        return s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase();
    }

    public static <T> String joinClassAttributeValues(final T object, String name, Class<T> clazz) {
        Field[] fields = clazz.getDeclaredFields();

        StringBuilder sb = new StringBuilder();
        sb.append(name).append("[");
        sb.append(org.apache.commons.lang.StringUtils.join(Collections2.transform(
                // Filter any field that does not start with lower case
                // (we expect constants to start with upper case)
                Collections2.filter(Arrays.asList(fields), new Predicate<Field>() {
                    @Override
                    public boolean apply(Field field) {
                        if ((field.getModifiers() & Modifier.STATIC) == Modifier.STATIC)
                            return false;
                        return Character.isLowerCase(field.getName().charAt(0));
                    }
                }),
                // Convert field to "name=value". value=*** on error
                new Function<Field, String>() {
                    @Override
                    public String apply(Field field) {
                        Object value;
                        try {
                            value = field.get(object);
                        } catch (Exception e) {
                            value = "***";
                        }
                        return field.getName() + "=" + value;
                    }
                }), ","));
        sb.append("]");

        return sb.toString();
    }

    public static <T> String joinClassGettersValues(final T object, String name, Class<T> clazz) {
        Method[] methods = clazz.getDeclaredMethods();

        StringBuilder sb = new StringBuilder();
        sb.append(name).append("[");
        sb.append(org.apache.commons.lang.StringUtils.join(Collections2.transform(
                // Filter any field that does not start with lower case
                // (we expect constants to start with upper case)
                Collections2.filter(Arrays.asList(methods), new Predicate<Method>() {
                    @Override
                    public boolean apply(Method method) {
                        if ((method.getModifiers() & Modifier.STATIC) == Modifier.STATIC)
                            return false;
                        return org.apache.commons.lang.StringUtils.startsWith(method.getName(), "get");
                    }
                }),
                // Convert field to "name=value". value=*** on error
                new Function<Method, String>() {
                    @Override
                    public String apply(Method method) {
                        Object value;
                        try {
                            value = method.invoke(object);
                        } catch (Exception e) {
                            value = "***";
                        }
                        return org.apache.commons.lang.StringUtils.uncapitalize(
                                org.apache.commons.lang.StringUtils.substring(method.getName(), 3)) + "=" + value;
                    }
                }), ","));
        sb.append("]");

        return sb.toString();
    }
}