| // Copyright (C) 2010 The Android Open Source Project |
| // |
| // 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 com.google.gerrit.server.query; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| |
| public abstract class RewritePredicate<T> extends Predicate<T> { |
| private boolean init; |
| private String name = getClass().getSimpleName(); |
| private List<Predicate<T>> children = Collections.emptyList(); |
| |
| protected void init(String name, Predicate<T>... args) { |
| this.init = true; |
| this.name = name; |
| this.children = Arrays.asList(args); |
| } |
| |
| @Override |
| public Predicate<T> copy(Collection<? extends Predicate<T>> children) { |
| return this; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean equals(Object other) { |
| if (other instanceof RewritePredicate) { |
| RewritePredicate<T> that = (RewritePredicate<T>) other; |
| if (this.init && that.init) { |
| return this.getClass() == that.getClass() |
| && this.name.equals(that.name) |
| && this.children.equals(that.children); |
| } |
| } |
| return this == other; |
| } |
| |
| @Override |
| public int hashCode() { |
| int h = getClass().hashCode(); |
| if (!children.isEmpty()) { |
| h *= 31; |
| h += children.get(0).hashCode(); |
| } |
| return h; |
| } |
| |
| @Override |
| public final String toString() { |
| final StringBuilder r = new StringBuilder(); |
| r.append(name); |
| if (!children.isEmpty()) { |
| r.append("("); |
| for (int i = 0; i < children.size(); i++) { |
| if (i != 0) { |
| r.append(" "); |
| } |
| r.append(children.get(i)); |
| } |
| r.append(")"); |
| } |
| return r.toString(); |
| } |
| } |