| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * 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.intellij.util.io; |
| |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| /** |
| * @author max |
| */ |
| public class StringRef { |
| public static final StringRef[] EMPTY_ARRAY = new StringRef[0]; |
| |
| private int id; |
| private String name; |
| private final AbstractStringEnumerator store; |
| |
| private StringRef(@NotNull String name) { |
| this.name = name; |
| id = -1; |
| store = null; |
| } |
| |
| private StringRef(final int id, @NotNull AbstractStringEnumerator store) { |
| this.id = id; |
| this.store = store; |
| name = null; |
| } |
| |
| public String getString() { |
| String name = this.name; |
| if (name == null) { |
| try { |
| this.name = name = store.valueOf(id); |
| } |
| catch (IOException e) { |
| store.markCorrupted(); |
| throw new RuntimeException(e); |
| } |
| } |
| return name; |
| } |
| |
| public void writeTo(@NotNull DataOutput out, @NotNull AbstractStringEnumerator store) throws IOException { |
| int nameId = getId(store); |
| out.writeByte(nameId & 0xFF); |
| DataInputOutputUtil.writeINT(out, nameId >> 8); |
| } |
| |
| public int getId(@NotNull AbstractStringEnumerator store) { |
| if (id == -1) { |
| try { |
| id = store.enumerate(name); |
| } |
| catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| return id; |
| } |
| |
| public String toString() { |
| return getString(); |
| } |
| |
| public int length() { |
| return getString().length(); |
| } |
| |
| public int hashCode() { |
| return toString().hashCode(); |
| } |
| |
| public boolean equals(final Object that) { |
| return that == this || that instanceof StringRef && toString().equals(that.toString()); |
| } |
| |
| public static String toString(@Nullable StringRef ref) { |
| return ref != null ? ref.getString() : null; |
| } |
| |
| public static StringRef fromString(@Nullable String source) { |
| return source == null ? null : new StringRef(source); |
| } |
| |
| @NotNull |
| public static StringRef fromNullableString(@Nullable String source) { |
| return new StringRef(source == null ? "" : source); |
| } |
| |
| public static StringRef fromStream(@NotNull DataInput in, @NotNull AbstractStringEnumerator store) throws IOException { |
| final int nameId = DataInputOutputUtil.readINT(in); |
| |
| return nameId != 0 ? new StringRef(nameId, store) : null; |
| } |
| |
| @NotNull |
| public static StringRef[] createArray(int count) { |
| return count == 0 ? EMPTY_ARRAY : new StringRef[count]; |
| } |
| } |