Examples of org.eclipse.jdt.core.eval.IEvaluationContext

org.eclipse.jdt.core.eval.IEvaluationContext
An evaluation context supports evaluating code snippets.
A code snippet is pretty much any valid piece of Java code that could be pasted into the body of a method and compiled. However, there are two areas where the rules are slightly more liberal.
First, a code snippet can return heterogeneous types. Inside the same code snippet an int could be returned on one line, and a String on the next, etc. For example, the following would be considered a valid code snippet:
```
  char c = '3'; switch (c) { case '1': return 1; case '2': return '2'; case '3': return "3"; default: return null; }  
```
Second, if the last statement is only an expression, the return keyword is implied. For example, the following returns false:
```
  int i = 1; i == 2  
```
Global variables are an additional feature of evaluation contexts. Within an evaluation context, global variables maintain their value across evaluations. These variables are particularly useful for storing the result of an evaluation for use in subsequent evaluations.

The evaluation context remembers the name of the package in which code snippets are run. The user can set this to any package, thereby gaining access to types that are normally only visible within that package.

Finally, the evaluation context remembers a list of import declarations. The user can import any packages and types so that the code snippets may refer to types by their shorter simple names.

Example of use:
```
  IJavaProject project = getJavaProject(); IEvaluationContext context = project.newEvaluationContext(); String codeSnippet = "int i= 0; i++"; ICodeSnippetRequestor requestor = ...; context.evaluateCodeSnippet(codeSnippet, requestor, progressMonitor);  
```
IJavaProject.newEvaluationContext can be used to obtain an instance.
@see IJavaProject#newEvaluationContext() @noimplement This interface is not intended to be implemented by clients.

                }
            }
        };
        collector.acceptContext( new CompletionContext() );
        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            evalContext.codeComplete( classNameStart,
                                      classNameStart.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

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        CompletionProposalCollector collector = new CompletionProposalCollector( javaProject );
        collector.acceptContext( new CompletionContext() );


        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            List imports = getImports();
            if ( imports != null && imports.size() > 0 ) {
                evalContext.setImports( (String[]) imports.toArray( new String[imports.size()] ) );
            }
            StringBuffer javaTextWithParams = new StringBuffer();
            Iterator iterator = params.entrySet().iterator();
            while ( iterator.hasNext() ) {
                Map.Entry entry = (Map.Entry) iterator.next();
                // this does not seem to work, so adding variables manually
                // evalContext.newVariable((String) entry.getValue(), (String) entry.getKey(), null);
                javaTextWithParams.append( entry.getValue() + " " + entry.getKey() + ";\n" );
            }
            if (useDrools) {
                javaTextWithParams.append( "org.drools.spi.KnowledgeHelper drools;" );
                javaTextWithParams.append( "org.kie.runtime.rule.RuleContext kcontext;" );
            }
            if (useContext) {
                javaTextWithParams.append( "org.drools.spi.ProcessContext context;" );
                javaTextWithParams.append( "org.drools.runtime.process.ProcessContext kcontext;" );
            }
            javaTextWithParams.append( javaText );
            String jtext = javaTextWithParams.toString();
            String fixedText = new KnowledgeHelperFixer().fix( jtext );


            evalContext.codeComplete( fixedText,
                                      fixedText.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

View Full Code Here

                }
            }
        };
        collector.acceptContext( new CompletionContext() );
        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            evalContext.codeComplete( classNameStart,
                                      classNameStart.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

View Full Code Here


        CompletionProposalCollector collector = new CompletionProposalCollector( javaProject );
        collector.acceptContext( new CompletionContext() );


        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            List<String> imports = getImports();
            if ( imports != null && imports.size() > 0 ) {
                evalContext.setImports(imports.toArray(new String[imports.size()]));
            }
            StringBuffer javaTextWithParams = new StringBuffer();
            for (Entry<String, String> entry : params.entrySet()) {
                // this does not seem to work, so adding variables manually
                // evalContext.newVariable((String) entry.getValue(), (String) entry.getKey(), null);
                javaTextWithParams.append( entry.getValue() + " " + entry.getKey() + ";\n" );
            }
            if (useDrools) {
                javaTextWithParams.append( "org.kie.api.runtime.rule.RuleContext kcontext;" );
            }
            if (useContext) {
                javaTextWithParams.append( "org.kie.api.runtime.process.ProcessContext kcontext;" );
            }
            javaTextWithParams.append( javaText );
            String jtext = javaTextWithParams.toString();
            String fixedText = KnowledgeHelperFixer.fix(jtext);


            evalContext.codeComplete( fixedText,
                                      fixedText.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

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      throws JavaModelException {
    ITextSelection selection = (ITextSelection) getSelectionProvider()
        .getSelection();
    int start = selection.getOffset();
    String snippet = getSourceViewer().getDocument().get();
    IEvaluationContext e = getEvaluationContext();
    if (e != null) {
      e.codeComplete(snippet, start, fCollector);
      
      
    }
    
  }

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                }
            }
        };
        collector.acceptContext( new CompletionContext() );
        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            evalContext.codeComplete( classNameStart,
                                      classNameStart.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

View Full Code Here


        CompletionProposalCollector collector = new CompletionProposalCollector( javaProject );
        collector.acceptContext( new CompletionContext() );


        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            List imports = getImports();
            if ( imports != null && imports.size() > 0 ) {
                evalContext.setImports( (String[]) imports.toArray( new String[imports.size()] ) );
            }
            StringBuffer javaTextWithParams = new StringBuffer();
            Iterator iterator = params.entrySet().iterator();
            while ( iterator.hasNext() ) {
                Map.Entry entry = (Map.Entry) iterator.next();
                // this does not seem to work, so adding variables manually
                // evalContext.newVariable((String) entry.getValue(), (String) entry.getKey(), null);
                javaTextWithParams.append( entry.getValue() + " " + entry.getKey() + ";\n" );
            }
            if (useDrools) {
                javaTextWithParams.append( "org.drools.spi.KnowledgeHelper drools;" );
                javaTextWithParams.append( "org.drools.runtime.rule.RuleContext kcontext;" );
            }
            if (useContext) {
                javaTextWithParams.append( "org.drools.spi.ProcessContext context;" );
                javaTextWithParams.append( "org.drools.runtime.process.ProcessContext kcontext;" );
            }
            javaTextWithParams.append( javaText );
            String jtext = javaTextWithParams.toString();
            String fixedText = new KnowledgeHelperFixer().fix( jtext );


            evalContext.codeComplete( fixedText,
                                      fixedText.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

View Full Code Here

                }
            }
        };
        collector.acceptContext( new CompletionContext() );
        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            evalContext.codeComplete( classNameStart,
                                      classNameStart.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

View Full Code Here


        CompletionProposalCollector collector = new CompletionProposalCollector( javaProject );
        collector.acceptContext( new CompletionContext() );


        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            List imports = getImports();
            if ( imports != null && imports.size() > 0 ) {
                evalContext.setImports( (String[]) imports.toArray( new String[imports.size()] ) );
            }
            StringBuffer javaTextWithParams = new StringBuffer();
            Iterator iterator = params.entrySet().iterator();
            while ( iterator.hasNext() ) {
                Map.Entry entry = (Map.Entry) iterator.next();
                // this does not seem to work, so adding variables manually
                // evalContext.newVariable((String) entry.getValue(), (String) entry.getKey(), null);
                javaTextWithParams.append( entry.getValue() + " " + entry.getKey() + ";\n" );
            }
            if (useDrools) {
                javaTextWithParams.append( "org.kie.api.runtime.rule.RuleContext kcontext;" );
            }
            if (useContext) {
                javaTextWithParams.append( "org.kie.api.runtime.process.ProcessContext kcontext;" );
            }
            javaTextWithParams.append( javaText );
            String jtext = javaTextWithParams.toString();
            String fixedText = new KnowledgeHelperFixer().fix( jtext );


            evalContext.codeComplete( fixedText,
                                      fixedText.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

View Full Code Here

                }
            }
        };
        collector.acceptContext( new CompletionContext() );
        try {
            IEvaluationContext evalContext = javaProject.newEvaluationContext();
            evalContext.codeComplete( classNameStart,
                                      classNameStart.length(),
                                      collector );
            IJavaCompletionProposal[] proposals = collector.getJavaCompletionProposals();
            for ( int i = 0; i < proposals.length; i++ ) {
                if ( proposals[i] instanceof AbstractJavaCompletionProposal ) {

View Full Code Here

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