ClasspathMacro.java

/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * 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:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.ext.java.client.command.valueproviders;

import com.google.common.base.Optional;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import org.eclipse.che.api.promises.client.Function;
import org.eclipse.che.api.promises.client.FunctionException;
import org.eclipse.che.api.promises.client.Promise;
import org.eclipse.che.api.promises.client.PromiseProvider;
import org.eclipse.che.ide.api.app.AppContext;
import org.eclipse.che.ide.api.macro.Macro;
import org.eclipse.che.ide.api.resources.Project;
import org.eclipse.che.ide.api.resources.Resource;
import org.eclipse.che.ide.ext.java.client.JavaLocalizationConstant;
import org.eclipse.che.ide.ext.java.client.command.ClasspathContainer;
import org.eclipse.che.ide.ext.java.client.project.classpath.ClasspathResolver;
import org.eclipse.che.ide.ext.java.client.util.JavaUtil;
import org.eclipse.che.ide.ext.java.shared.dto.classpath.ClasspathEntryDto;

import java.util.List;
import java.util.Set;

import static org.eclipse.che.ide.ext.java.client.command.ClasspathContainer.JRE_CONTAINER;
import static org.eclipse.che.ide.ext.java.shared.ClasspathEntryKind.LIBRARY;

/**
 * Provides project's classpath.
 *
 * @author Valeriy Svydenko
 */
@Singleton
public class ClasspathMacro implements Macro {

    private static final String KEY = "${project.java.classpath}";

    private final ClasspathContainer classpathContainer;
    private final ClasspathResolver  classpathResolver;
    private final AppContext         appContext;
    private final PromiseProvider    promises;
    private final JavaLocalizationConstant localizationConstants;

    @Inject
    public ClasspathMacro(ClasspathContainer classpathContainer,
                          ClasspathResolver classpathResolver,
                          AppContext appContext,
                          PromiseProvider promises,
                          JavaLocalizationConstant localizationConstants) {
        this.classpathContainer = classpathContainer;
        this.classpathResolver = classpathResolver;
        this.appContext = appContext;
        this.promises = promises;
        this.localizationConstants = localizationConstants;
    }

    @Override
    public String getName() {
        return KEY;
    }

    @Override
    public String getDescription() {
        return localizationConstants.macroProjectJavaClasspathDescription();
    }

    @Override
    public Promise<String> expand() {

        final Resource[] resources = appContext.getResources();

        if (resources == null || resources.length != 1) {
            return promises.resolve("");
        }

        final Resource resource = resources[0];
        final Optional<Project> project = resource.getRelatedProject();

        if (!JavaUtil.isJavaProject(project.get())) {
            return promises.resolve("");
        }

        final String projectPath = project.get().getLocation().toString();

        return classpathContainer.getClasspathEntries(projectPath).then(new Function<List<ClasspathEntryDto>, String>() {
            @Override
            public String apply(List<ClasspathEntryDto> arg) throws FunctionException {
                classpathResolver.resolveClasspathEntries(arg);
                Set<String> libs = classpathResolver.getLibs();
                StringBuilder classpath = new StringBuilder();
                for (String lib : libs) {
                    classpath.append(lib).append(':');
                }

                for (ClasspathEntryDto container : classpathResolver.getContainers()) {
                    if (!JRE_CONTAINER.equals(container.getPath())) {
                        addLibsFromContainer(container, classpath);
                    }
                }

                if (classpath.toString().isEmpty()) {
                    classpath.append(appContext.getProjectsRoot().toString()).append(projectPath).append(':');
                }

                return classpath.toString();
            }
        });
    }

    private void addLibsFromContainer(ClasspathEntryDto container, StringBuilder classpath) {
        for (ClasspathEntryDto entry : container.getExpandedEntries()) {
            if (LIBRARY == entry.getEntryKind()) {
                classpath.append(entry.getPath()).append(':');
            }
        }
    }

}