Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT License. See License.txt in the project root for license information.
/** * Copyright (c) Microsoft Corporation. All rights reserved. * Licensed under the MIT License. See License.txt in the project root for * license information. */
package com.microsoft.azure.management.resources.fluentcore.arm; import java.util.ArrayList; import java.util.Collection; import java.util.HashSet; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap;
Base implementation for expandable, single string enums.
Type parameters:
  • <T> – a specific expandable enum type
/** * Base implementation for expandable, single string enums. * @param <T> a specific expandable enum type */
public abstract class ExpandableStringEnum<T extends ExpandableStringEnum<T>> { private static ConcurrentMap<String, ? extends ExpandableStringEnum<?>> valuesByName = null; private String name; private Class<T> clazz; private static String uniqueKey(Class<?> clazz, String name) { if (clazz != null) { return (clazz.getName() + "#" + name).toLowerCase(); } else { throw new IllegalArgumentException(); } } @SuppressWarnings("unchecked") protected T withNameValue(String name, T value, Class<T> clazz) { if (valuesByName == null) { valuesByName = new ConcurrentHashMap<String, T>(); } this.name = name; this.clazz = clazz; ((ConcurrentMap<String, T>) valuesByName).put(uniqueKey(clazz, name), value); return (T) this; } @SuppressWarnings("unchecked") protected static <T extends ExpandableStringEnum<T>> T fromString(String name, Class<T> clazz) { if (name == null) { return null; } else if (valuesByName != null) { T value = (T) valuesByName.get(uniqueKey(clazz, name)); if (value != null) { return value; } } try { T value = clazz.newInstance(); return value.withNameValue(name, value, clazz); } catch (InstantiationException e) { return null; } catch (IllegalAccessException e) { return null; } } @SuppressWarnings("unchecked") protected static <T extends ExpandableStringEnum<T>> Collection<T> values(Class<T> clazz) { // Make a copy of all values Collection<? extends ExpandableStringEnum<?>> values = new ArrayList<>(valuesByName.values()); Collection<T> list = new HashSet<T>(); for (ExpandableStringEnum<?> value : values) { if (value.getClass().isAssignableFrom(clazz)) { list.add((T) value); } } return list; } @Override public String toString() { return this.name; } @Override public int hashCode() { return uniqueKey(this.clazz, this.name).hashCode(); } @SuppressWarnings("unchecked") @Override public boolean equals(Object obj) { if (obj == null) { return false; } else if (!clazz.isAssignableFrom(obj.getClass())) { return false; } else if (obj == this) { return true; } else if (this.name == null) { return ((ExpandableStringEnum<T>) obj).name == null; } else { return this.name.equals(((ExpandableStringEnum<T>) obj).name); } } }