org.jetbrains.plugins.groovy.actions.generate.missing.GroovyGenerateMethodMissingHandler.java Source code

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Here is the source code for org.jetbrains.plugins.groovy.actions.generate.missing.GroovyGenerateMethodMissingHandler.java

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/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jetbrains.plugins.groovy.actions.generate.missing;

import com.intellij.codeInsight.generation.ClassMember;
import com.intellij.codeInsight.generation.GenerateMembersHandlerBase;
import com.intellij.codeInsight.generation.GenerationInfo;
import com.intellij.ide.fileTemplates.FileTemplate;
import com.intellij.ide.fileTemplates.FileTemplateManager;
import com.intellij.ide.fileTemplates.JavaTemplateUtil;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.DialogWrapper;
import com.intellij.openapi.ui.Messages;
import com.intellij.openapi.util.Computable;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.CommonClassNames;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.PsiParameter;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.actions.generate.GroovyCodeInsightBundle;
import org.jetbrains.plugins.groovy.actions.generate.GroovyGenerationInfo;
import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElementFactory;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.members.GrMethod;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Properties;

/**
 * @author Max Medvedev
 */
public class GroovyGenerateMethodMissingHandler extends GenerateMembersHandlerBase {
    private static final Logger LOG = Logger.getInstance(GroovyGenerateMethodMissingHandler.class);

    public GroovyGenerateMethodMissingHandler() {
        super("");
    }

    @Override
    protected ClassMember[] getAllOriginalMembers(PsiClass aClass) {
        return ClassMember.EMPTY_ARRAY;
    }

    @NotNull
    @Override
    protected List<? extends GenerationInfo> generateMemberPrototypes(PsiClass aClass, ClassMember[] members)
            throws IncorrectOperationException {

        final String templName = JavaTemplateUtil.TEMPLATE_FROM_USAGE_METHOD_BODY;
        final FileTemplate template = FileTemplateManager.getInstance().getCodeTemplate(templName);

        final GrMethod method = genMethod(aClass, template);
        return method != null ? Collections.singletonList(new GroovyGenerationInfo<GrMethod>(method, true))
                : Collections.<GenerationInfo>emptyList();
    }

    @Nullable
    private static GrMethod genMethod(PsiClass aClass, FileTemplate template) {
        Properties properties = FileTemplateManager.getInstance().getDefaultProperties(aClass.getProject());
        properties.setProperty(FileTemplate.ATTRIBUTE_RETURN_TYPE, "java.lang.Object");
        properties.setProperty(FileTemplate.ATTRIBUTE_DEFAULT_RETURN_VALUE, "null");
        properties.setProperty(FileTemplate.ATTRIBUTE_CALL_SUPER, "");
        properties.setProperty(FileTemplate.ATTRIBUTE_CLASS_NAME, aClass.getQualifiedName());
        properties.setProperty(FileTemplate.ATTRIBUTE_SIMPLE_CLASS_NAME, aClass.getName());
        properties.setProperty(FileTemplate.ATTRIBUTE_METHOD_NAME, "methodMissing");

        String bodyText;
        try {
            bodyText = StringUtil.replace(template.getText(properties), ";", "");
        } catch (IOException e) {
            return null;
        }
        return GroovyPsiElementFactory.getInstance(aClass.getProject())
                .createMethodFromText("def methodMissing(String name, def args) {\n" + bodyText + "\n}");
    }

    @Override
    protected GenerationInfo[] generateMemberPrototypes(PsiClass aClass, ClassMember originalMember)
            throws IncorrectOperationException {
        return GenerationInfo.EMPTY_ARRAY;
    }

    @Override
    public boolean startInWriteAction() {
        return true;
    }

    @Nullable
    @Override
    protected ClassMember[] chooseOriginalMembers(PsiClass aClass, Project project) {
        final PsiMethod[] missings = aClass.findMethodsByName("methodMissing", true);

        PsiMethod method = null;

        for (PsiMethod missing : missings) {
            final PsiParameter[] parameters = missing.getParameterList().getParameters();
            if (parameters.length == 2) {
                if (isNameParam(parameters[0])) {
                    method = missing;
                }
            }
        }
        if (method != null) {
            String text = GroovyCodeInsightBundle.message("generate.method.missing.already.defined.warning");

            if (Messages.showYesNoDialog(project, text,
                    GroovyCodeInsightBundle.message("generate.method.missing.already.defined.title"),
                    Messages.getQuestionIcon()) == DialogWrapper.OK_EXIT_CODE) {
                final PsiMethod finalMethod = method;
                if (!ApplicationManager.getApplication().runWriteAction(new Computable<Boolean>() {
                    public Boolean compute() {
                        try {
                            finalMethod.delete();
                            return Boolean.TRUE;
                        } catch (IncorrectOperationException e) {
                            LOG.error(e);
                            return Boolean.FALSE;
                        }
                    }
                }).booleanValue()) {
                    return null;
                }
            } else {
                return null;
            }
        }

        return new ClassMember[1];
    }

    private static boolean isNameParam(PsiParameter parameter) {
        return parameter.getType().equalsToText(CommonClassNames.JAVA_LANG_STRING)
                || parameter.getType().equalsToText(CommonClassNames.JAVA_LANG_OBJECT);
    }

    @Nullable
    @Override
    protected ClassMember[] chooseMembers(ClassMember[] members, boolean allowEmptySelection,
            boolean copyJavadocCheckbox, Project project, @Nullable Editor editor) {
        return ClassMember.EMPTY_ARRAY;
    }
}