AddConstructorParamQuickFixProposal.java

/*******************************************************************************
 *  Copyright (c) 2012 VMware, Inc.
 *  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:
 *      VMware, Inc. - initial API and implementation
 *******************************************************************************/
package org.springframework.ide.eclipse.quickfix.proposals;

import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.dom.ClassInstanceCreation;
import org.eclipse.jdt.core.dom.IMethodBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.internal.ui.JavaPluginImages;
import org.eclipse.jface.text.IDocument;
import org.eclipse.swt.graphics.Image;
import org.springframework.ide.eclipse.quickfix.QuickfixUtils;
import org.springsource.ide.eclipse.commons.core.StatusHandler;


/**
 * Quick fix proposal for adding parameters to a constructor
 * @author Terry Denney
 * @author Leo Dos Santos
 * @author Christian Dupuis
 * @since 2.0
 */
public class AddConstructorParamQuickFixProposal extends BeanAttributeQuickFixProposal {

	private final int numAdditionalParams;

	private final IMethod constructor;

	private final String label;

	private final IJavaProject javaProject;

	public AddConstructorParamQuickFixProposal(int offset, int length, boolean missingEndQuote,
			int numAdditionalParams, IMethod constructor, String label, IJavaProject javaProject) {
		super(offset, length, missingEndQuote);
		this.numAdditionalParams = numAdditionalParams;
		this.constructor = constructor;
		this.label = label;
		this.javaProject = javaProject;
	}

	@Override
	public void applyQuickFix(IDocument document) {
		try {
			int numParams = constructor.getNumberOfParameters();
			Object[] changeDesc = QuickfixReflectionUtils.createChangeDescriptionArray(numParams + numAdditionalParams);

			ITypeBinding objectBinding = QuickfixUtils.getTargetTypeBinding(javaProject, javaProject
					.findType("java.lang.Object"));
			for (int i = numParams; i < numParams + numAdditionalParams; i++) {
				changeDesc[i] = QuickfixReflectionUtils.createInsertDescription(objectBinding, "obj" + (i + 1));
			}

			ICompilationUnit targetCU = constructor.getCompilationUnit();

			String[] paramTypes = new String[numParams];
			for (int i = 0; i < numParams; i++) {
				paramTypes[i] = "Object";
			}

			IMethodBinding methodBinding = QuickfixUtils.getMethodBinding(javaProject, constructor);
			if (methodBinding != null) {
				ClassInstanceCreation invocationNode = QuickfixUtils.getMockConstructorInvocation(constructor
						.getDeclaringType().getFullyQualifiedName(), paramTypes);
				Object proposal = QuickfixReflectionUtils.createChangeMethodSignatureProposal(label, targetCU,
						invocationNode, methodBinding, changeDesc, 5, getImage());
				QuickfixReflectionUtils.applyProposal(proposal, document);
			}
		}
		catch (JavaModelException e) {
			StatusHandler.log(e.getStatus());
		}
	}

	public String getDisplayString() {
		String additionalParams = "";
		for (int i = 0; i < numAdditionalParams; i++) {
			if (i > 0) {
				additionalParams += ", ";
			}
			additionalParams += "'Object'";
		}
		return label + ": Add parameter " + additionalParams;
	}

	public Image getImage() {
		return JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_ADD);
	}

}