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/*
* 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.vcs.log.data;
import com.intellij.vcs.log.graph.PrintElement;
import com.intellij.vcs.log.graph.RowInfo;
import com.intellij.vcs.log.graph.VisibleGraph;
import com.intellij.vcs.log.graph.actions.ActionController;
import com.intellij.vcs.log.graph.actions.GraphAnswer;
import com.intellij.vcs.log.graph.actions.GraphMouseAction;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.awt.*;
import java.util.Collection;
import java.util.Collections;
class EmptyVisibleGraph implements VisibleGraph<Integer> {
private static final VisibleGraph<Integer> INSTANCE = new EmptyVisibleGraph();
@NotNull
public static VisibleGraph<Integer> getInstance() {
return INSTANCE;
}
@Override
public int getVisibleCommitCount() {
return 0;
}
@NotNull
@Override
public RowInfo<Integer> getRowInfo(int visibleRow) {
return EmptyRowInfo.INSTANCE;
}
@Override
public int getVisibleRowIndex(@NotNull Integer integer) {
return -1;
}
@NotNull
@Override
public ActionController<Integer> getActionController() {
return DumbActionController.INSTANCE;
}
private static class DumbActionController implements ActionController<Integer> {
private static ActionController<Integer> INSTANCE = new DumbActionController();
@NotNull
@Override
public GraphAnswer<Integer> performMouseAction(@NotNull GraphMouseAction graphMouseAction) {
return EmptyGraphAnswer.INSTANCE;
}
@Override
public boolean areLongEdgesHidden() {
return false;
}
@Override
public void setLongEdgesHidden(boolean longEdgesHidden) {
}
@Override
public void setLinearBranchesExpansion(boolean collapse) {
}
private static class EmptyGraphAnswer implements GraphAnswer<Integer> {
private static EmptyGraphAnswer INSTANCE = new EmptyGraphAnswer();
@Nullable
@Override
public Cursor getCursorToSet() {
return null;
}
@Nullable
@Override
public Integer getCommitToJump() {
return null;
}
}
}
private static class EmptyRowInfo implements RowInfo<Integer> {
private static final RowInfo<Integer> INSTANCE = new EmptyRowInfo();
@NotNull
@Override
public Integer getCommit() {
return 0;
}
@NotNull
@Override
public Integer getOneOfHeads() {
return 0;
}
@NotNull
@Override
public Collection<PrintElement> getPrintElements() {
return Collections.emptyList();
}
}
}
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