/*
* Copyright 2000-2014 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.execution.console;
import com.intellij.ide.ui.UISettings;
import com.intellij.openapi.util.SimpleModificationTracker;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.LinkedList;
import java.util.List;
/**
* @author Gregory.Shrago
*/
class ConsoleHistoryModel extends SimpleModificationTracker {
/** @noinspection FieldCanBeLocal*/
private final Object myLock;
private final LinkedList<String> myEntries;
private int myIndex;
ConsoleHistoryModel(@Nullable ConsoleHistoryModel masterModel) {
myEntries = masterModel == null ? new LinkedList<>() : masterModel.myEntries;
myLock = masterModel == null ? this : masterModel.myLock; // hard ref to master model
resetIndex();
}
ConsoleHistoryModel copy() {
return new ConsoleHistoryModel(this);
}
public void resetEntries(@NotNull List<String> entries) {
synchronized (myLock) {
myEntries.clear();
myEntries.addAll(entries.subList(0, Math.min(entries.size(), getMaxHistorySize())));
incModificationCount();
}
}
public void addToHistory(@Nullable String statement) {
if (StringUtil.isEmptyOrSpaces(statement)) return;
synchronized (myLock) {
int maxHistorySize = getMaxHistorySize();
myEntries.remove(statement);
int size = myEntries.size();
if (size >= maxHistorySize && size > 0) {
myEntries.removeFirst();
}
myEntries.addLast(statement);
incModificationCount();
}
}
@Override
public void incModificationCount() {
resetIndex();
super.incModificationCount();
}
protected void resetIndex() {
synchronized (myLock) {
myIndex = myEntries.size();
}
}
public int getMaxHistorySize() {
return UISettings.getInstance().CONSOLE_COMMAND_HISTORY_LIMIT;
}
public void removeFromHistory(String statement) {
synchronized (myLock) {
myEntries.remove(statement);
incModificationCount();
}
}
public List<String> getEntries() {
synchronized (myLock) {
return ContainerUtil.newArrayList(myEntries);
}
}
public boolean isEmpty() {
synchronized (myLock) {
return myEntries.isEmpty();
}
}
public int getHistorySize() {
synchronized (myLock) {
return myEntries.size();
}
}
@Nullable
public String getHistoryNext() {
synchronized (myLock) {
if (myIndex >= 0) --myIndex;
return getCurrentEntry();
}
}
@Nullable
public String getHistoryPrev() {
synchronized (myLock) {
if (myIndex <= myEntries.size() - 1) ++myIndex;
return getCurrentEntry();
}
}
public boolean hasHistory(final boolean next) {
synchronized (myLock) {
return next ? myIndex > 0 : myIndex < myEntries.size() - 1;
}
}
String getCurrentEntry() {
synchronized (myLock) {
return myIndex >= 0 && myIndex < myEntries.size() ? myEntries.get(myIndex) : null;
}
}
int getCurrentIndex() {
synchronized (myLock) {
return myIndex;
}
}
}