org.hibernate.eclipse.hqleditor.CompletionHelper.java Source code

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Here is the source code for org.hibernate.eclipse.hqleditor.CompletionHelper.java

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.hibernate.eclipse.hqleditor;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;

import org.eclipse.jdt.core.CompletionContext;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.eval.IEvaluationContext;
import org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal;
import org.eclipse.jdt.internal.ui.text.java.JavaCompletionProposal;
import org.eclipse.jdt.internal.ui.text.java.LazyJavaCompletionProposal;
import org.eclipse.jdt.ui.text.java.CompletionProposalComparator;
import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.hibernate.eclipse.console.HibernateConsoleMessages;
import org.hibernate.eclipse.console.HibernateConsolePlugin;
import org.hibernate.eclipse.hqleditor.HibernateResultCollector.Settings;

public class CompletionHelper {

    static public ICompletionProposal[] completeOnJavaTypes(IJavaProject javaProject, Settings settings,
            String packageName, String start, int offset) {

        if (javaProject != null) {
            IEvaluationContext context = javaProject.newEvaluationContext();
            if (packageName != null) {
                context.setPackageName(packageName);
            }

            HibernateResultCollector rc = new HibernateResultCollector(javaProject);
            rc.acceptContext(new CompletionContext());
            //rc.reset(offset, javaProject, null);
            rc.setAccepts(settings);
            try {
                // cannot send in my own document as it won't compile as
                // java - so we just send in
                // the smallest snippet possible
                context.codeComplete(start, start.length(), rc);
            } catch (JavaModelException jme) {
                HibernateConsolePlugin.getDefault().logErrorMessage(
                        HibernateConsoleMessages.CompletionHelper_could_not_complete_java_types, jme);
            }
            IJavaCompletionProposal[] results = rc.getJavaCompletionProposals();
            transpose(start, offset, results);
            return results;
        }
        return new ICompletionProposal[0];
    }

    static public void transpose(String start, int offset, IJavaCompletionProposal[] results) {
        // As all completions have made with the assumption on a empty
        // (or almost empty) string
        // we move the replacementoffset on every proposol to fit nicely
        // into our non-java code
        for (int i = 0; i < results.length; i++) {
            if (results[i] instanceof AbstractJavaCompletionProposal) {
                AbstractJavaCompletionProposal proposal = (AbstractJavaCompletionProposal) results[i]; // TODO: eclipse bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=84998
                transpose(offset, proposal);
            } else {
                HibernateConsolePlugin.getDefault()
                        .log(HibernateConsoleMessages.CompletionHelper_error_unknown_completion_proposal_class);
            }
        }
        Arrays.sort(results, new CompletionProposalComparator());
    }

    private static void transpose(int offset, AbstractJavaCompletionProposal proposal) {
        int wanted = proposal.getReplacementOffset() + (offset /*- start.length()*/);
        if (wanted == proposal.getReplacementOffset()) {
            //System.out.println("NO TRANSPOSE!");
        }
        if (wanted < 0) {
            wanted = 0;
        }
        proposal.setReplacementOffset(wanted);
    }
}