org.eclipse.mylyn.internal.java.ui.AbstractJavaContextComputationStrategy.java Source code

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Here is the source code for org.eclipse.mylyn.internal.java.ui.AbstractJavaContextComputationStrategy.java

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/*******************************************************************************
 * Copyright (c) 2011 Tasktop Technologies.
 * 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:
 *     Tasktop Technologies - initial API and implementation
 *******************************************************************************/
package org.eclipse.mylyn.internal.java.ui;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.search.IJavaSearchConstants;
import org.eclipse.jdt.core.search.SearchEngine;
import org.eclipse.jdt.core.search.TypeNameMatch;
import org.eclipse.jdt.core.search.TypeNameMatchRequestor;
import org.eclipse.mylyn.context.core.ContextComputationStrategy;

/**
 * An abstract strategy that can find Java types in the workspace based on their fully qualified name.
 * 
 * @author David Green
 */
public abstract class AbstractJavaContextComputationStrategy extends ContextComputationStrategy {

    protected IType findTypeInWorkspace(String typeName) throws CoreException {
        int dot = typeName.lastIndexOf('.');
        char[][] qualifications;
        String simpleName;
        if (dot != -1) {
            qualifications = new char[][] { typeName.substring(0, dot).toCharArray() };
            simpleName = typeName.substring(dot + 1);
        } else {
            qualifications = null;
            simpleName = typeName;
        }
        char[][] typeNames = new char[][] { simpleName.toCharArray() };

        class ResultException extends RuntimeException {
            private static final long serialVersionUID = 1L;

            private final IType fType;

            public ResultException(IType type) {
                fType = type;
            }
        }
        TypeNameMatchRequestor requestor = new TypeNameMatchRequestor() {
            @Override
            public void acceptTypeNameMatch(TypeNameMatch match) {
                throw new ResultException(match.getType());
            }
        };
        try {
            new SearchEngine().searchAllTypeNames(qualifications, typeNames, SearchEngine.createWorkspaceScope(),
                    requestor, IJavaSearchConstants.WAIT_UNTIL_READY_TO_SEARCH, null);
        } catch (ResultException e) {
            return e.fType;
        }
        return null;
    }
}