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Spring Framework example source code file (SimpleAliasRegistry.java)
The Spring Framework SimpleAliasRegistry.java source code/* * Copyright 2002-2008 the original author or authors. * * 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 org.springframework.core; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import org.springframework.util.Assert; import org.springframework.util.StringUtils; import org.springframework.util.StringValueResolver; /** * Simple implementation of the {@link AliasRegistry} interface. * Serves as base class for * {@link org.springframework.beans.factory.support.BeanDefinitionRegistry} * implementations. * * @author Juergen Hoeller * @since 2.5.2 */ public class SimpleAliasRegistry implements AliasRegistry { /** Map from alias to canonical name */ private final Map aliasMap = CollectionFactory.createConcurrentMapIfPossible(16); public void registerAlias(String name, String alias) { Assert.hasText(name, "'name' must not be empty"); Assert.hasText(alias, "'alias' must not be empty"); if (alias.equals(name)) { this.aliasMap.remove(alias); } else { if (!allowAliasOverriding()) { String registeredName = (String) this.aliasMap.get(alias); if (registeredName != null && !registeredName.equals(name)) { throw new IllegalStateException("Cannot register alias '" + alias + "' for name '" + name + "': It is already registered for name '" + registeredName + "'."); } } this.aliasMap.put(alias, name); } } /** * Return whether alias overriding is allowed. * Default is <code>true. */ protected boolean allowAliasOverriding() { return true; } public void removeAlias(String alias) { String name = (String) this.aliasMap.remove(alias); if (name == null) { throw new IllegalStateException("No alias '" + alias + "' registered"); } } public boolean isAlias(String name) { return this.aliasMap.containsKey(name); } public String[] getAliases(String name) { List aliases = new ArrayList(); synchronized (this.aliasMap) { for (Iterator it = this.aliasMap.entrySet().iterator(); it.hasNext();) { Map.Entry entry = (Map.Entry) it.next(); String registeredName = (String) entry.getValue(); if (registeredName.equals(name)) { aliases.add(entry.getKey()); } } } return StringUtils.toStringArray(aliases); } /** * Resolve all alias target names and aliases registered in this * factory, applying the given StringValueResolver to them. * <p>The value resolver may for example resolve placeholders * in target bean names and even in alias names. * @param valueResolver the StringValueResolver to apply */ public void resolveAliases(StringValueResolver valueResolver) { Assert.notNull(valueResolver, "StringValueResolver must not be null"); synchronized (this.aliasMap) { Map aliasCopy = new HashMap(this.aliasMap); for (Iterator it = aliasCopy.keySet().iterator(); it.hasNext();) { String alias = (String) it.next(); String registeredName = (String) aliasCopy.get(alias); String resolvedAlias = valueResolver.resolveStringValue(alias); String resolvedName = valueResolver.resolveStringValue(registeredName); if (!resolvedAlias.equals(alias)) { String existingName = (String) this.aliasMap.get(resolvedAlias); if (existingName != null && !existingName.equals(resolvedName)) { throw new IllegalStateException("Cannot register resolved alias '" + resolvedAlias + "' (original: '" + alias + "') for name '" + resolvedName + "': It is already registered for name '" + registeredName + "'."); } this.aliasMap.put(resolvedAlias, resolvedName); this.aliasMap.remove(alias); } else if (!registeredName.equals(resolvedName)) { this.aliasMap.put(alias, resolvedName); } } } } /** * Determine the raw name, resolving aliases to canonical names. * @param name the user-specified name * @return the transformed name */ public String canonicalName(String name) { String canonicalName = name; // Handle aliasing. String resolvedName = null; do { resolvedName = (String) this.aliasMap.get(canonicalName); if (resolvedName != null) { canonicalName = resolvedName; } } while (resolvedName != null); return canonicalName; } } Other Spring Framework examples (source code examples)Here is a short list of links related to this Spring Framework SimpleAliasRegistry.java source code file: |
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