org.eclipse.virgo.ide.pde.core/src/org/eclipse/virgo/ide/pde/core/internal/Nature.java

/*********************************************************************
 * Copyright (c) 2015 GianMaria Romanato
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
**********************************************************************/

package org.eclipse.virgo.ide.pde.core.internal;

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;

/**
 * A marker nature that is used to contribute a custom build command, see {@link Builder}
 *
 *
 */
public class Nature implements IProjectNature {

    private IProject project;

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.core.resources.IProjectNature#configure()
     */
    public void configure() throws CoreException {
        IProjectDescription desc = this.project.getDescription();
        ICommand[] commands = desc.getBuildSpec();

        for (ICommand command : commands) {
            if (command.getBuilderName().equals(Constants.BUILDER_ID)) {
                return;
            }
        }

        ICommand[] newCommands = new ICommand[commands.length + 1];
        System.arraycopy(commands, 0, newCommands, 0, commands.length);
        ICommand command = desc.newCommand();
        command.setBuilderName(Constants.BUILDER_ID);
        newCommands[newCommands.length - 1] = command;
        desc.setBuildSpec(newCommands);
        this.project.setDescription(desc, null);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.core.resources.IProjectNature#deconfigure()
     */
    public void deconfigure() throws CoreException {
        IProjectDescription description = getProject().getDescription();
        ICommand[] commands = description.getBuildSpec();
        for (int i = 0; i < commands.length; ++i) {
            if (commands[i].getBuilderName().equals(Constants.BUILDER_ID)) {
                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;
            }
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.core.resources.IProjectNature#getProject()
     */
    public IProject getProject() {
        return this.project;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.core.resources.IProjectNature#setProject(org.eclipse.core.resources.IProject)
     */
    public void setProject(IProject project) {
        this.project = project;
    }

}