org.eclipse.virgo.ide.bundlor.jdt.core/src/org/eclipse/virgo/ide/bundlor/jdt/core/AstTypeArtifactAnalyser.java

/*******************************************************************************
 * Copyright (c) 2009, 2012 SpringSource, a divison of 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:
 *     SpringSource, a division of VMware, Inc. - initial API and implementation
 *******************************************************************************/

package org.eclipse.virgo.ide.bundlor.jdt.core;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTParser;
import org.eclipse.virgo.bundlor.support.ArtifactAnalyzer;
import org.eclipse.virgo.bundlor.support.partialmanifest.PartialManifest;

/**
 * {@link ArtefactAnalyser} that is delegates to JDT AST scanning
 * </p>
 * <strong>Concurrent Semantics</strong><br />
 * Not threadsafe.
 *
 * @author Christian Dupuis
 */
public class AstTypeArtifactAnalyser implements ArtifactAnalyzer {

    private static final String JAVA_EXT = ".java"; //$NON-NLS-1$

    private final IJavaProject javaProject;

    public AstTypeArtifactAnalyser(IJavaProject javaProject) {
        this.javaProject = javaProject;
    }

    /**
     * {@inheritDoc}
     */
    public void analyse(InputStream is, String name, PartialManifest model) throws Exception {
        ASTParser parser = ASTParser.newParser(AST.JLS3);
        parser.setProject(this.javaProject);
        parser.setSource(convertStreamToString(is).toCharArray());
        parser.setUnitName(name);
        parser.setResolveBindings(true);
        parser.setBindingsRecovery(true);
        parser.setStatementsRecovery(true);
        ASTNode node = parser.createAST(new NullProgressMonitor());
        node.accept(new ArtifactAnalyserTypeVisitor(model));
    }

    /**
     * {@inheritDoc}
     */
    public boolean canAnalyse(String name) {
        // For now only accept source files
        // TODO does it work with .class files as well?
        return name.endsWith(JAVA_EXT);
    }

    /**
     * Converts an {@link InputStream} into a {@link String} instance.
     */
    public String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line).append("\n");
            }
        } catch (IOException e) {
        } finally {
            try {
                is.close();
            } catch (IOException e) {
            }
        }

        return sb.toString();
    }

}