groovy.lang.Tuple Maven / Gradle / Ivy
/*
* 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 groovy.lang;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
import java.util.AbstractList;
import java.util.List;
/**
* Represents a list of Objects.
*
* @author James Strachan
*/
public class Tuple extends AbstractList {
private final Object[] contents;
private int hashCode;
public Tuple(Object[] contents) {
if (contents == null) throw new NullPointerException();
this.contents = contents;
}
public Object get(int index) {
return contents[index];
}
public int size() {
return contents.length;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || !(o instanceof Tuple)) return false;
Tuple that = (Tuple) o;
if (size() != that.size()) return false;
for (int i = 0; i < contents.length; i++) {
if (!DefaultTypeTransformation.compareEqual(contents[i], that.contents[i])) {
return false;
}
}
return true;
}
@Override
public int hashCode() {
if (hashCode == 0) {
for (int i = 0; i < contents.length; i++ ) {
Object value = contents[i];
int hash = (value != null) ? value.hashCode() : 0xbabe;
hashCode ^= hash;
}
if (hashCode == 0) {
hashCode = 0xbabe;
}
}
return hashCode;
}
@Override
public List subList(int fromIndex, int toIndex) {
int size = toIndex - fromIndex;
Object[] newContent = new Object[size];
System.arraycopy(contents, fromIndex, newContent, 0, size);
return new Tuple(newContent);
}
}