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/*******************************************************************************
* Copyright (c) 2005, 2017 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Amir Kouchekinia - Bug 200762
* Lars Vogel - Bug 525783
*******************************************************************************/
package org.eclipse.jface.fieldassist;
import java.util.ArrayList;
/**
* SimpleContentProposalProvider is a class designed to map a static list of
* Strings to content proposals.
*
* @see IContentProposalProvider
* @since 3.2
*/
public class SimpleContentProposalProvider implements IContentProposalProvider {
/*
* The proposals provided.
*/
private String[] proposals;
/*
* The proposals mapped to IContentProposal. Cached for speed in the case
* where filtering is not used.
*/
private IContentProposal[] contentProposals;
/*
* Boolean that tracks whether filtering is used.
*/
private boolean filterProposals = false;
/**
* Construct a SimpleContentProposalProvider whose content proposals are always
* the specified array of Objects.
*
* @param proposals
* the Strings to be returned whenever proposals are requested.
*/
public SimpleContentProposalProvider(String... proposals) {
super();
this.proposals = proposals;
}
/**
* Return an array of Objects representing the valid content proposals for a
* field.
*
* @param contents
* the current contents of the field (only consulted if filtering
* is set to true)
* @param position
* the current cursor position within the field (ignored)
* @return the array of Objects that represent valid proposals for the field
* given its current content.
*/
@Override
public IContentProposal[] getProposals(String contents, int position) {
if (filterProposals) {
ArrayList list = new ArrayList<>();
for (String proposal : proposals) {
if (proposal.length() >= contents.length()
&& proposal.substring(0, contents.length())
.equalsIgnoreCase(contents)) {
list.add(new ContentProposal(proposal));
}
}
return list.toArray(new IContentProposal[list
.size()]);
}
if (contentProposals == null) {
contentProposals = new IContentProposal[proposals.length];
for (int i = 0; i < proposals.length; i++) {
contentProposals[i] = new ContentProposal(proposals[i]);
}
}
return contentProposals;
}
/**
* Set the Strings to be used as content proposals.
*
* @param items
* the Strings to be used as proposals.
*/
public void setProposals(String... items) {
this.proposals = items;
contentProposals = null;
}
/**
* Set the boolean that controls whether proposals are filtered according to
* the current field content.
*
* @param filterProposals
* true if the proposals should be filtered to
* show only those that match the current contents of the field,
* and false if the proposals should remain the
* same, ignoring the field content.
* @since 3.3
*/
public void setFiltering(boolean filterProposals) {
this.filterProposals = filterProposals;
// Clear any cached proposals.
contentProposals = null;
}
}