/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.core;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaElementDelta;
import org.eclipse.jdt.core.IJavaModelStatus;
import org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.JavaConventions;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.core.util.Messages;
import org.eclipse.jdt.internal.core.util.Util;
/**
* <p>This operation creates a compilation unit (CU).
* If the CU doesn't exist yet, a new compilation unit will be created with the content provided.
* Otherwise the operation will override the contents of an existing CU with the new content.
*
* <p>Note: It is possible to create a CU automatically when creating a
* class or interface. Thus, the preferred method of creating a CU is
* to perform a create type operation rather than
* first creating a CU and secondly creating a type inside the CU.
*
* <p>Required Attributes:<ul>
* <li>The package fragment in which to create the compilation unit.
* <li>The name of the compilation unit.
* Do not include the <code>".java"</code> suffix (ex. <code>"Object"</code> -
* the <code>".java"</code> will be added for the name of the compilation unit.)
* <li>
* </ul>
*/
public class CreateCompilationUnitOperation extends JavaModelOperation {
/**
* The name of the compilation unit being created.
*/
protected String name;
/**
* The source code to use when creating the element.
*/
protected String source= null;
/**
* When executed, this operation will create a compilation unit with the given name.
* The name should have the ".java" suffix.
*/
public CreateCompilationUnitOperation(IPackageFragment parentElement, String name, String source, boolean force) {
super(null, new IJavaElement[] {parentElement}, force);
this.name = name;
this.source = source;
}
/**
* Creates a compilation unit.
*
* @exception JavaModelException if unable to create the compilation unit.
*/
protected void executeOperation() throws JavaModelException {
try {
beginTask(Messages.operation_createUnitProgress, 2);
JavaElementDelta delta = newJavaElementDelta();
ICompilationUnit unit = getCompilationUnit();
IPackageFragment pkg = (IPackageFragment) getParentElement();
IContainer folder = (IContainer) pkg.getResource();
worked(1);
IFile compilationUnitFile = folder.getFile(new Path(this.name));
if (compilationUnitFile.exists()) {
// update the contents of the existing unit if fForce is true
if (this.force) {
IBuffer buffer = unit.getBuffer();
if (buffer == null) return;
buffer.setContents(this.source);
unit.save(new NullProgressMonitor(), false);
this.resultElements = new IJavaElement[] {unit};
if (!Util.isExcluded(unit)
&& unit.getParent().exists()) {
for (int i = 0; i < this.resultElements.length; i++) {
delta.changed(this.resultElements[i], IJavaElementDelta.F_CONTENT);
}
addDelta(delta);
}
} else {
throw new JavaModelException(new JavaModelStatus(
IJavaModelStatusConstants.NAME_COLLISION,
Messages.bind(Messages.status_nameCollision, compilationUnitFile.getFullPath().toString())));
}
} else {
try {
String encoding = null;
try {
encoding = folder.getDefaultCharset(); // get folder encoding as file is not accessible
}
catch (CoreException ce) {
// use no encoding
}
InputStream stream = new ByteArrayInputStream(encoding == null ? this.source.getBytes() : this.source.getBytes(encoding));
createFile(folder, unit.getElementName(), stream, this.force);
this.resultElements = new IJavaElement[] {unit};
if (!Util.isExcluded(unit)
&& unit.getParent().exists()) {
for (int i = 0; i < this.resultElements.length; i++) {
delta.added(this.resultElements[i]);
}
addDelta(delta);
}
} catch (IOException e) {
throw new JavaModelException(e, IJavaModelStatusConstants.IO_EXCEPTION);
}
}
worked(1);
} finally {
done();
}
}
/**
* @see CreateElementInCUOperation#getCompilationUnit()
*/
protected ICompilationUnit getCompilationUnit() {
return ((IPackageFragment)getParentElement()).getCompilationUnit(this.name);
}
protected ISchedulingRule getSchedulingRule() {
IResource resource = getCompilationUnit().getResource();
IWorkspace workspace = resource.getWorkspace();
if (resource.exists()) {
return workspace.getRuleFactory().modifyRule(resource);
} else {
return workspace.getRuleFactory().createRule(resource);
}
}
/**
* Possible failures: <ul>
* <li>NO_ELEMENTS_TO_PROCESS - the package fragment supplied to the operation is
* <code>null</code>.
* <li>INVALID_NAME - the compilation unit name provided to the operation
* is <code>null</code> or has an invalid syntax
* <li>INVALID_CONTENTS - the source specified for the compiliation unit is null
* </ul>
*/
public IJavaModelStatus verify() {
if (getParentElement() == null) {
return new JavaModelStatus(IJavaModelStatusConstants.NO_ELEMENTS_TO_PROCESS);
}
IJavaProject project = getParentElement().getJavaProject();
if (JavaConventions.validateCompilationUnitName(this.name, project.getOption(JavaCore.COMPILER_SOURCE, true), project.getOption(JavaCore.COMPILER_COMPLIANCE, true)).getSeverity() == IStatus.ERROR) {
return new JavaModelStatus(IJavaModelStatusConstants.INVALID_NAME, this.name);
}
if (this.source == null) {
return new JavaModelStatus(IJavaModelStatusConstants.INVALID_CONTENTS);
}
return JavaModelStatus.VERIFIED_OK;
}
}