Case Study: adding data and statistics

[ifi-stolz-refaktor.git] / case-study / jdt-after / ui / org / eclipse / jdt / internal / ui / text / java / FillArgumentNamesCompletionProposalCollector.java

diff --git a/case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/text/java/FillArgumentNamesCompletionProposalCollector.java b/case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/text/java/FillArgumentNamesCompletionProposalCollector.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
+ * 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:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.ui.text.java;
+
+import org.eclipse.jface.preference.IPreferenceStore;
+
+import org.eclipse.jdt.core.CompletionProposal;
+import org.eclipse.jdt.core.ICompilationUnit;
+import org.eclipse.jdt.core.IJavaProject;
+import org.eclipse.jdt.core.JavaCore;
+import org.eclipse.jdt.core.Signature;
+
+import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
+
+import org.eclipse.jdt.ui.PreferenceConstants;
+import org.eclipse.jdt.ui.text.java.CompletionProposalCollector;
+import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;
+import org.eclipse.jdt.ui.text.java.JavaContentAssistInvocationContext;
+
+import org.eclipse.jdt.internal.ui.JavaPlugin;
+
+/**
+ * Completion proposal collector which creates proposals with
+ * filled in argument names.
+ * <p>
+ * This collector is used when
+ * {@link PreferenceConstants#CODEASSIST_FILL_ARGUMENT_NAMES} is enabled.
+ * <p/>
+ */
+public final class FillArgumentNamesCompletionProposalCollector extends CompletionProposalCollector {
+
+       private final boolean fIsGuessArguments;
+
+       public FillArgumentNamesCompletionProposalCollector(JavaContentAssistInvocationContext context) {
+               super(context.getCompilationUnit(), true);
+               setInvocationContext(context);
+               IPreferenceStore preferenceStore= JavaPlugin.getDefault().getPreferenceStore();
+               fIsGuessArguments= preferenceStore.getBoolean(PreferenceConstants.CODEASSIST_GUESS_METHOD_ARGUMENTS);
+               if (preferenceStore.getBoolean(PreferenceConstants.CODEASSIST_FILL_ARGUMENT_NAMES)) {
+                       setRequireExtendedContext(true);
+               }
+       }
+
+       /*
+        * @see org.eclipse.jdt.internal.ui.text.java.ResultCollector#createJavaCompletionProposal(org.eclipse.jdt.core.CompletionProposal)
+        */
+       @Override
+       protected IJavaCompletionProposal createJavaCompletionProposal(CompletionProposal proposal) {
+               switch (proposal.getKind()) {
+                       case CompletionProposal.METHOD_REF:
+                       case CompletionProposal.CONSTRUCTOR_INVOCATION:
+                       case CompletionProposal.METHOD_REF_WITH_CASTED_RECEIVER:
+                               return createMethodReferenceProposal(proposal);
+                       case CompletionProposal.TYPE_REF:
+                               return createTypeProposal(proposal);
+                       default:
+                               return super.createJavaCompletionProposal(proposal);
+               }
+       }
+
+       private IJavaCompletionProposal createMethodReferenceProposal(CompletionProposal methodProposal) {
+               String completion= String.valueOf(methodProposal.getCompletion());
+               // super class' behavior if this is not a normal completion or has no
+               // parameters
+               if ((completion.length() == 0) || ((completion.length() == 1) && completion.charAt(0) == ')') || Signature.getParameterCount(methodProposal.getSignature()) == 0 || getContext().isInJavadoc())
+                       return super.createJavaCompletionProposal(methodProposal);
+
+               LazyJavaCompletionProposal proposal= null;
+               proposal= ParameterGuessingProposal.createProposal(methodProposal, getInvocationContext(), fIsGuessArguments);
+               if (proposal == null) {
+                       proposal= new FilledArgumentNamesMethodProposal(methodProposal, getInvocationContext());
+               }
+               return proposal;
+       }
+
+       /*
+        * @see org.eclipse.jdt.internal.ui.text.java.ResultCollector#createTypeCompletion(org.eclipse.jdt.core.CompletionProposal)
+        */
+       IJavaCompletionProposal createTypeProposal(CompletionProposal typeProposal) {
+               final ICompilationUnit cu= getCompilationUnit();
+               if (cu == null || getContext() != null && getContext().isInJavadoc())
+                       return super.createJavaCompletionProposal(typeProposal);
+
+               IJavaProject project= cu.getJavaProject();
+               if (!shouldProposeGenerics(project))
+                       return super.createJavaCompletionProposal(typeProposal);
+
+               char[] completion= typeProposal.getCompletion();
+               // don't add parameters for import-completions nor for proposals with an empty completion (e.g. inside the type argument list)
+               if (completion.length > 0 && (completion[completion.length - 1] == ';' || completion[completion.length - 1] == '.'))
+                       return super.createJavaCompletionProposal(typeProposal);
+
+               LazyJavaCompletionProposal newProposal= new LazyGenericTypeProposal(typeProposal, getInvocationContext());
+               return newProposal;
+       }
+
+       /**
+        * Returns <code>true</code> if generic proposals should be allowed,
+        * <code>false</code> if not. Note that even though code (in a library)
+        * may be referenced that uses generics, it is still possible that the
+        * current source does not allow generics.
+        *
+        * @param project the Java project
+        * @return <code>true</code> if the generic proposals should be allowed,
+        *         <code>false</code> if not
+        */
+       private final boolean shouldProposeGenerics(IJavaProject project) {
+               String sourceVersion;
+               if (project != null)
+                       sourceVersion= project.getOption(JavaCore.COMPILER_SOURCE, true);
+               else
+                       sourceVersion= JavaCore.getOption(JavaCore.COMPILER_SOURCE);
+
+               return JavaModelUtil.is50OrHigher(sourceVersion);
+       }
+}