/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* All rights reserved.
*
* 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.alibaba.citrus.util;
import java.io.Serializable;
/**
* 基本常量。
*
* @author Michael Zhou
*/
public final class BasicConstant {
// =============================================================
// 数组常量
// =============================================================
// primitive arrays
/** 空的<code>byte</code>数组。 */
public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
public static final Byte[] EMPTY_BYTE_OBJECT_ARRAY = new Byte[0];
/** 空的<code>short</code>数组。 */
public static final short[] EMPTY_SHORT_ARRAY = new short[0];
public static final Short[] EMPTY_SHORT_OBJECT_ARRAY = new Short[0];
/** 空的<code>int</code>数组。 */
public static final int[] EMPTY_INT_ARRAY = new int[0];
public static final Integer[] EMPTY_INTEGER_OBJECT_ARRAY = new Integer[0];
/** 空的<code>long</code>数组。 */
public static final long[] EMPTY_LONG_ARRAY = new long[0];
public static final Long[] EMPTY_LONG_OBJECT_ARRAY = new Long[0];
/** 空的<code>float</code>数组。 */
public static final float[] EMPTY_FLOAT_ARRAY = new float[0];
public static final Float[] EMPTY_FLOAT_OBJECT_ARRAY = new Float[0];
/** 空的<code>double</code>数组。 */
public static final double[] EMPTY_DOUBLE_ARRAY = new double[0];
public static final Double[] EMPTY_DOUBLE_OBJECT_ARRAY = new Double[0];
/** 空的<code>char</code>数组。 */
public static final char[] EMPTY_CHAR_ARRAY = new char[0];
public static final Character[] EMPTY_CHARACTER_OBJECT_ARRAY = new Character[0];
/** 空的<code>boolean</code>数组。 */
public static final boolean[] EMPTY_BOOLEAN_ARRAY = new boolean[0];
public static final Boolean[] EMPTY_BOOLEAN_OBJECT_ARRAY = new Boolean[0];
// object arrays
/** 空的<code>Object</code>数组。 */
public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
/** 空的<code>Class</code>数组。 */
public static final Class<?>[] EMPTY_CLASS_ARRAY = new Class[0];
/** 空的<code>String</code>数组。 */
public static final String[] EMPTY_STRING_ARRAY = new String[0];
// =============================================================
// 对象常量
// =============================================================
// 0-valued primitive wrappers
public static final Byte BYTE_ZERO = new Byte((byte) 0);
public static final Short SHORT_ZERO = new Short((short) 0);
public static final Integer INT_ZERO = new Integer(0);
public static final Long LONG_ZERO = new Long(0L);
public static final Float FLOAT_ZERO = new Float(0);
public static final Double DOUBLE_ZERO = new Double(0);
public static final Character CHAR_NULL = new Character('\0');
public static final Boolean BOOL_FALSE = Boolean.FALSE;
/** 代表null值的占位对象。 */
public static final Object NULL_PLACEHOLDER = new NullPlaceholder();
private final static class NullPlaceholder implements Serializable {
private static final long serialVersionUID = 7092611880189329093L;
@Override
public String toString() {
return "null";
}
private Object readResolve() {
return NULL_PLACEHOLDER;
}
}
/** 空字符串。 */
public static final String EMPTY_STRING = "";
}