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package org.eclipse.jst.jsp.ui.internal.contentassist;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jdt.core.CompletionProposal;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.Signature;
import org.eclipse.jdt.ui.text.java.CompletionProposalCollector;
import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.jst.jsp.core.internal.java.JSP2ServletNameUtil;
import org.eclipse.jst.jsp.core.internal.java.JSPTranslation;
import org.eclipse.swt.graphics.Image;
/**
* Passed into ICodeComplete#codeComplete(int offset, CompletionRequestor requestor).
* Adapts IJavaCompletionProposals to JSPCompletion proposals.
* This includes:
* - translating offsets
* - "fixing" up display strings
* - filtering some unwanted proposals
*
* @since 1.0
*/
public class JSPProposalCollector extends CompletionProposalCollector {
private String fJspName;
private String fMangledName;
private JSPTranslation fTranslation;
public JSPProposalCollector(ICompilationUnit cu, JSPTranslation translation) {
super(cu);
if(cu != null) {
// set some names for fixing up mangled name in proposals
// set mangled (servlet) name
String cuName = cu.getPath().lastSegment();
setMangledName(cuName.substring(0, cuName.lastIndexOf('.')));
// set name of jsp file
String unmangled = JSP2ServletNameUtil.unmangle(cuName);
setJspName(unmangled.substring(unmangled.lastIndexOf('/') + 1));
}
if(translation == null)
throw new IllegalArgumentException("JSPTranslation cannot be null"); //$NON-NLS-1$
fTranslation = translation;
}
/**
* Ensures that we only return JSPCompletionProposals.
* @return an array of JSPCompletionProposals
*/
public JSPCompletionProposal[] getJSPCompletionProposals() {
List results = new ArrayList();
IJavaCompletionProposal[] javaProposals = getJavaCompletionProposals();
// need to filter out non JSPCompletionProposals
// because their offsets haven't been translated
for (int i = 0; i < javaProposals.length; i++) {
if(javaProposals[i] instanceof JSPCompletionProposal)
results.add(javaProposals[i]);
}
return (JSPCompletionProposal[])results.toArray(new JSPCompletionProposal[results.size()]);
}
/**
* Overridden to:
* - translate Java -> JSP offsets
* - fix cursor-position-after
* - fix mangled servlet name in display string
* - remove unwanted proposals (servlet constructor)
*/
protected IJavaCompletionProposal createJavaCompletionProposal(CompletionProposal proposal) {
JSPCompletionProposal jspProposal = null;
// from proposal
String completion = String.valueOf(proposal.getCompletion());
String mangledName = getMangledName();
// ignore constructor proposals
// (they will include mangled servlet name)
if(mangledName != null && completion.indexOf(mangledName) == -1) {
// java offset
int offset = proposal.getReplaceStart();
// replacement length
int length = proposal.getReplaceEnd() - offset;
// translate offset from Java > JSP
offset = fTranslation.getJspOffset(offset);
// cursor position after must be calculated
int positionAfter = calculatePositionAfter(proposal, completion, offset);
// from java proposal
IJavaCompletionProposal javaProposal = super.createJavaCompletionProposal(proposal);
Image image = javaProposal.getImage();
String displayString = javaProposal.getDisplayString();
displayString = fixupDisplayString(displayString);
IContextInformation contextInformation = javaProposal.getContextInformation();
String additionalInfo = javaProposal.getAdditionalProposalInfo();
int relevance = javaProposal.getRelevance();
boolean updateLengthOnValidate = true;
jspProposal = new JSPCompletionProposal(completion, offset, length, positionAfter, image, displayString, contextInformation, additionalInfo, relevance, updateLengthOnValidate);
}
return jspProposal;
}
/**
* Cacluates the where the cursor should be after applying this proposal.
* eg. method(|) if the method proposal chosen had params.
*
* @param proposal
* @param completion
* @param currentCursorOffset
* @return
*/
private int calculatePositionAfter(CompletionProposal proposal, String completion, int currentCursorOffset) {
// calculate cursor position after
int positionAfter = completion.length();
int kind = proposal.getKind();
// may need better logic here...
// put cursor inside parenthesis if there's params
// only checking for any kind of declaration
if(kind == CompletionProposal.ANONYMOUS_CLASS_DECLARATION || kind == CompletionProposal.METHOD_DECLARATION || kind == CompletionProposal.POTENTIAL_METHOD_DECLARATION || kind == CompletionProposal.METHOD_REF) {
String[] params = Signature.getParameterTypes(String.valueOf(proposal.getSignature()));
if(completion.length() > 0 && params.length > 0)
positionAfter--;
}
return positionAfter;
}
/**
* Replaces mangled (servlet) name with jsp file name.
*
* @param displayString
* @return
*/
private String fixupDisplayString(String displayString) {
StringBuffer fixedName = new StringBuffer(displayString);
String mangledName = getMangledName();
if(mangledName != null) {
int index = displayString.indexOf(mangledName);
if(index != -1) {
fixedName = new StringBuffer();
fixedName.append(displayString.substring(0, index));
fixedName.append(getJspName());
fixedName.append(displayString.substring(index + mangledName.length()));
}
}
return fixedName.toString();
}
private String getMangledName() {
return fMangledName;
}
private void setMangledName(String mangledName) {
fMangledName = mangledName;
}
private String getJspName() {
return fJspName;
}
private void setJspName(String jspName) {
fJspName = jspName;
}
static char[] getTypeTriggers() {
return TYPE_TRIGGERS;
}
}
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