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commons-lang-2.6.jar - Apache Commons Lang
commons-lang-2.6.jar is the JAR file for Apache Commons Lang 2.6, which provides a host of helper utilities for the java.lang API.
JAR File Size and Download Location:
File name: commons-lang-2.6.jar File size: 284220 bytes Date modified: 01/13/2011 Download: Apache Commons Lang Website
✍: FYIcenter
⏎ org/apache/commons/lang/enums/ValuedEnum.java
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.commons.lang.enums; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.Iterator; import java.util.List; import org.apache.commons.lang.ClassUtils; /** * <p>Abstract superclass for type-safe enums with integer values suitable * for use in <code>switch</code> statements.</p> * * <p><em>NOTE:</em>Due to the way in which Java ClassLoaders work, comparing * <code>Enum</code> objects should always be done using the equals() method, * not <code>==</code>. The equals() method will try <code>==</code> first so * in most cases the effect is the same.</p> * * <p>To use this class, it must be subclassed. For example:</p> * * <pre> * public final class JavaVersionEnum extends ValuedEnum { * //standard enums for version of JVM * public static final int JAVA1_0_VALUE = 100; * public static final int JAVA1_1_VALUE = 110; * public static final int JAVA1_2_VALUE = 120; * public static final int JAVA1_3_VALUE = 130; * public static final JavaVersionEnum JAVA1_0 = new JavaVersionEnum( "Java 1.0", JAVA1_0_VALUE ); * public static final JavaVersionEnum JAVA1_1 = new JavaVersionEnum( "Java 1.1", JAVA1_1_VALUE ); * public static final JavaVersionEnum JAVA1_2 = new JavaVersionEnum( "Java 1.2", JAVA1_2_VALUE ); * public static final JavaVersionEnum JAVA1_3 = new JavaVersionEnum( "Java 1.3", JAVA1_3_VALUE ); * * private JavaVersionEnum(String name, int value) { * super( name, value ); * } * * public static JavaVersionEnum getEnum(String javaVersion) { * return (JavaVersionEnum) getEnum(JavaVersionEnum.class, javaVersion); * } * * public static JavaVersionEnum getEnum(int javaVersion) { * return (JavaVersionEnum) getEnum(JavaVersionEnum.class, javaVersion); * } * * public static Map getEnumMap() { * return getEnumMap(JavaVersionEnum.class); * } * * public static List getEnumList() { * return getEnumList(JavaVersionEnum.class); * } * * public static Iterator iterator() { * return iterator(JavaVersionEnum.class); * } * } * </pre> * * <p><em>NOTE:</em>These are declared <code>final</code>, so compilers may * inline the code. Ensure you recompile everything when using final. </p> * * <p>The above class could then be used as follows:</p> * * <pre> * public void doSomething(JavaVersionEnum ver) { * switch (ver.getValue()) { * case JAVA1_0_VALUE: * // ... * break; * case JAVA1_1_VALUE: * // ... * break; * //... * } * } * </pre> * * <p>As shown, each enum has a name and a value. These can be accessed using * <code>getName</code> and <code>getValue</code>.</p> * * <p><em>NOTE:</em> Because the switch is ultimately sitting on top of an * int, the example above is not type-safe. That is, there is nothing that * checks that JAVA1_0_VALUE is a legal constant for JavaVersionEnum. </p> * * <p>The <code>getEnum</code> and <code>iterator</code> methods are recommended. * Unfortunately, Java restrictions require these to be coded as shown in each subclass. * An alternative choice is to use the {@link EnumUtils} class.</p> * * @author Apache Avalon project * @author Apache Software Foundation * @since 2.1 (class existed in enum package from v1.0) * @version $Id: ValuedEnum.java 905636 2010-02-02 14:03:32Z niallp $ */ public abstract class ValuedEnum extends Enum { /** * Required for serialization support. * * @see java.io.Serializable */ private static final long serialVersionUID = -7129650521543789085L; /** * The value contained in enum. */ private final int iValue; /** * Constructor for enum item. * * @param name the name of enum item * @param value the value of enum item */ protected ValuedEnum(String name, int value) { super(name); iValue = value; } /** * <p>Gets an <code>Enum</code> object by class and value.</p> * * <p>This method loops through the list of <code>Enum</code>, * thus if there are many <code>Enum</code>s this will be * slow.</p> * * @param enumClass the class of the <code>Enum</code> to get * @param value the value of the <code>Enum</code> to get * @return the enum object, or null if the enum does not exist * @throws IllegalArgumentException if the enum class is <code>null</code> */ protected static Enum getEnum(Class enumClass, int value) { if (enumClass == null) { throw new IllegalArgumentException("The Enum Class must not be null"); } List list = Enum.getEnumList(enumClass); for (Iterator it = list.iterator(); it.hasNext();) { ValuedEnum enumeration = (ValuedEnum) it.next(); if (enumeration.getValue() == value) { return enumeration; } } return null; } /** * <p>Get value of enum item.</p> * * @return the enum item's value. */ public final int getValue() { return iValue; } /** * <p>Tests for order.</p> * * <p>The default ordering is numeric by value, but this * can be overridden by subclasses.</p> * * <p>NOTE: From v2.2 the enums must be of the same type. * If the parameter is in a different class loader than this instance, * reflection is used to compare the values.</p> * * @see java.lang.Comparable#compareTo(Object) * @param other the other object to compare to * @return -ve if this is less than the other object, +ve if greater than, * <code>0</code> of equal * @throws ClassCastException if other is not an <code>Enum</code> * @throws NullPointerException if other is <code>null</code> */ public int compareTo(Object other) { if (other == this) { return 0; } if (other.getClass() != this.getClass()) { if (other.getClass().getName().equals(this.getClass().getName())) { return iValue - getValueInOtherClassLoader(other); } throw new ClassCastException( "Different enum class '" + ClassUtils.getShortClassName(other.getClass()) + "'"); } return iValue - ((ValuedEnum) other).iValue; } /** * <p>Use reflection to return an objects value.</p> * * @param other the object to determine the value for * @return the value */ private int getValueInOtherClassLoader(Object other) { try { Method mth = other.getClass().getMethod("getValue", null); Integer value = (Integer) mth.invoke(other, null); return value.intValue(); } catch (NoSuchMethodException e) { // ignore - should never happen } catch (IllegalAccessException e) { // ignore - should never happen } catch (InvocationTargetException e) { // ignore - should never happen } throw new IllegalStateException("This should not happen"); } /** * <p>Human readable description of this <code>Enum</code> item.</p> * * @return String in the form <code>type[name=value]</code>, for example: * <code>JavaVersion[Java 1.0=100]</code>. Note that the package name is * stripped from the type name. */ public String toString() { if (iToString == null) { String shortName = ClassUtils.getShortClassName(getEnumClass()); iToString = shortName + "[" + getName() + "=" + getValue() + "]"; } return iToString; } }
⏎ org/apache/commons/lang/enums/ValuedEnum.java
⇒ commons-lang-1.0.1.jar - Apache Commons Lang
⇐ What Is commons-lang3-3.1.jar
2009-12-24, 80066👍, 0💬
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