org.eclipse.jdt.internal.core.JavaNature Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2000, 2024 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.core;
import org.eclipse.core.resources.ICommand;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IProjectNature;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.JavaCore;
/** Implements nature of {@link JavaCore#NATURE_ID} **/
public class JavaNature implements IProjectNature {
/** initialized by {@link IProjectNature#setProject(IProject)} */
private IProject project;
@Override
public IProject getProject() {
return this.project;
}
@Override
public void setProject(IProject project) {
this.project = project;
}
/**
* Configure the project with Java nature.
*/
@Override
public void configure() throws CoreException {
// register Java builder
addToBuildSpec(JavaCore.BUILDER_ID);
}
/**
* /** Removes the Java nature from the project.
*/
@Override
public void deconfigure() throws CoreException {
// deregister Java builder
removeFromBuildSpec(JavaCore.BUILDER_ID);
}
/**
* Adds a builder to the build spec for the given project.
*/
protected void addToBuildSpec(String builderID) throws CoreException {
IProjectDescription description = this.project.getDescription();
int javaCommandIndex = getJavaCommandIndex(description.getBuildSpec());
if (javaCommandIndex == -1) {
// Add a Java command to the build spec
ICommand command = description.newCommand();
command.setBuilderName(builderID);
setJavaCommand(description, command);
}
}
/**
* Find the specific Java command amongst the given build spec and return its index or -1 if not found.
*/
private int getJavaCommandIndex(ICommand[] buildSpec) {
for (int i = 0; i < buildSpec.length; ++i) {
if (buildSpec[i].getBuilderName().equals(JavaCore.BUILDER_ID)) {
return i;
}
}
return -1;
}
/**
* Update the Java command in the build spec (replace existing one if present, add one first if none).
*/
private void setJavaCommand(IProjectDescription description, ICommand newCommand) throws CoreException {
ICommand[] oldBuildSpec = description.getBuildSpec();
int oldJavaCommandIndex = getJavaCommandIndex(oldBuildSpec);
ICommand[] newCommands;
if (oldJavaCommandIndex == -1) {
// Add a Java build spec before other builders (1FWJK7I)
newCommands = new ICommand[oldBuildSpec.length + 1];
System.arraycopy(oldBuildSpec, 0, newCommands, 1, oldBuildSpec.length);
newCommands[0] = newCommand;
} else {
oldBuildSpec[oldJavaCommandIndex] = newCommand;
newCommands = oldBuildSpec;
}
// Commit the spec change into the project
description.setBuildSpec(newCommands);
this.project.setDescription(description, null);
}
/**
* Removes the given builder from the build spec for the given project.
*/
protected void removeFromBuildSpec(String builderID) throws CoreException {
IProjectDescription description = this.project.getDescription();
ICommand[] commands = description.getBuildSpec();
for (int i = 0; i < commands.length; ++i) {
if (commands[i].getBuilderName().equals(builderID)) {
ICommand[] newCommands = new ICommand[commands.length - 1];
System.arraycopy(commands, 0, newCommands, 0, i);
System.arraycopy(commands, i + 1, newCommands, i, commands.length - i - 1);
description.setBuildSpec(newCommands);
this.project.setDescription(description, null);
return;
}
}
}
}