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Groovy example source code file (SpreadMap.java)
The Groovy SpreadMap.java source code/* * Copyright 2003-2011 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 groovy.lang; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Iterator; import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation; /** * Represents a spreadable map which extends java.util.HashMap. * * @author Pilho Kim */ public class SpreadMap extends HashMap { private Map mapData; private int hashCode; public SpreadMap(Object[] values) { mapData = new HashMap(values.length / 2); int i = 0; while (i < values.length) { mapData.put(values[i++], values[i++]); } } public SpreadMap(Map map) { this.mapData = map; } /** * @since 1.8.0 * @param list the list to make spreadable */ public SpreadMap(List list) { this(list.toArray()); } public Object get(Object obj) { return mapData.get(obj); } public Object put(Object key, Object value) { throw new RuntimeException("SpreadMap: " + this + " is an immutable map, and so (" + key + ": " + value + ") cannot be added."); } public Object remove(Object key) { throw new RuntimeException("SpreadMap: " + this + " is an immutable map, and so the key (" + key + ") cannot be deleted."); } public void putAll(Map t) { throw new RuntimeException("SpreadMap: " + this + " is an immutable map, and so the map (" + t + ") cannot be put in this spreadMap."); } public int size() { return mapData.keySet().size(); } public boolean equals(Object that) { if (that instanceof SpreadMap) { return equals((SpreadMap) that); } return false; } public boolean equals(SpreadMap that) { if (that == null) return false; if (size() == that.size()) { Iterator iter = mapData.keySet().iterator(); for (; iter.hasNext(); ) { Object key = iter.next(); if (! DefaultTypeTransformation.compareEqual(get(key), that.get(key)) ) { return false; } } return true; } return false; } public int hashCode() { if (hashCode == 0) { Iterator iter = mapData.keySet().iterator(); for (; iter.hasNext(); ) { Object key = iter.next(); int hash = (key != null) ? key.hashCode() : 0xbabe; hashCode ^= hash; } } return hashCode; } /** * @return the string expression of <code>this */ public String toString() { if (mapData.isEmpty()) { return "*:[:]"; } StringBuffer buff = new StringBuffer("*:["); Iterator iter = mapData.keySet().iterator(); for (; iter.hasNext(); ) { Object key = iter.next(); buff.append(key + ":" + mapData.get(key)); if (iter.hasNext()) buff.append(", "); } buff.append("]"); return buff.toString(); } } Other Groovy examples (source code examples)Here is a short list of links related to this Groovy SpreadMap.java source code file: |
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