Copyright (c) 2000, 2012 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
/*******************************************************************************
 * Copyright (c) 2000, 2012 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.IResourceRuleFactory;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.core.runtime.jobs.MultiRule;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaModelStatus;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.core.JavaModelManager.PerProjectInfo;

This operation sets an IJavaProject's classpath.
See Also:
IJavaProject/**
 * This operation sets an <code>IJavaProject</code>'s classpath.
 *
 * @see IJavaProject
 */
public class SetClasspathOperation extends ChangeClasspathOperation {

	IClasspathEntry[] newRawClasspath;
	IClasspathEntry[] referencedEntries;
	IPath newOutputLocation;
	JavaProject project;

	public SetClasspathOperation(
		JavaProject project,
		IClasspathEntry[] newRawClasspath,
		IPath newOutputLocation,
		boolean canChangeResource) {

		this(project, newRawClasspath, null, newOutputLocation, canChangeResource);
	}
	
	
When executed, this operation sets the raw classpath and output location of the given project.
/**
	 * When executed, this operation sets the raw classpath and output location of the given project.
	 */
	public SetClasspathOperation(
		JavaProject project,
		IClasspathEntry[] newRawClasspath,
		IClasspathEntry[] referencedEntries,
		IPath newOutputLocation,
		boolean canChangeResource) {

		super(new IJavaElement[] { project }, canChangeResource);
		this.project = project;
		this.newRawClasspath = newRawClasspath;
		this.referencedEntries = referencedEntries;
		this.newOutputLocation = newOutputLocation;
	}

	
Sets the classpath of the pre-specified project.
/**
	 * Sets the classpath of the pre-specified project.
	 */
	@Override
	protected void executeOperation() throws JavaModelException {
		checkCanceled();
		try {
			// set raw classpath and null out resolved info
			PerProjectInfo perProjectInfo = this.project.getPerProjectInfo();
			ClasspathChange classpathChange = perProjectInfo.setRawClasspath(this.newRawClasspath, this.referencedEntries, this.newOutputLocation, JavaModelStatus.VERIFIED_OK/*format is ok*/);

			// if needed, generate delta, update project ref, create markers, ...
			classpathChanged(classpathChange, true/*refresh if external linked folder already exists*/);

			// write .classpath file
			if (this.canChangeResources && perProjectInfo.writeAndCacheClasspath(this.project, this.newRawClasspath, this.newOutputLocation))
				setAttribute(HAS_MODIFIED_RESOURCE_ATTR, TRUE);
		} finally {
			done();
		}
	}
	
	@Override
	protected ISchedulingRule getSchedulingRule() {
		if (this.canChangeResources) {
			IResourceRuleFactory ruleFactory = ResourcesPlugin.getWorkspace().getRuleFactory();
			return new MultiRule(new ISchedulingRule[] {
				// use project modification rule as this is needed to create the .classpath file if it doesn't exist yet, or to update project references
				ruleFactory.modifyRule(this.project.getProject()),
				
				// and external project modification rule in case the external folders are modified
				ruleFactory.modifyRule(JavaModelManager.getExternalManager().getExternalFoldersProject())
			});
		}
		return super.getSchedulingRule();
	}

	@Override
	public String toString(){
		StringBuffer buffer = new StringBuffer(20);
		buffer.append("SetClasspathOperation\n"); //$NON-NLS-1$
		buffer.append(" - classpath : "); //$NON-NLS-1$
		buffer.append("{"); //$NON-NLS-1$
		for (int i = 0; i < this.newRawClasspath.length; i++) {
			if (i > 0) buffer.append(","); //$NON-NLS-1$
			IClasspathEntry element = this.newRawClasspath[i];
			buffer.append(" ").append(element.toString()); //$NON-NLS-1$
		}
		buffer.append("\n - output location : ");  //$NON-NLS-1$
		buffer.append(this.newOutputLocation.toString());
		return buffer.toString();
	}

	@Override
	public IJavaModelStatus verify() {
		IJavaModelStatus status = super.verify();
		if (!status.isOK())
			return status;
		this.project.flushClasspathProblemMarkers(false, false, true);
		return ClasspathEntry.validateClasspath(this.project, this.newRawClasspath, this.newOutputLocation);
	}

}