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/*******************************************************************************
* Copyright (c) 2000, 2013 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.debug.internal.core;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILogicalStructureType;
import org.eclipse.debug.core.model.ILogicalStructureTypeDelegate;
import org.eclipse.debug.core.model.ILogicalStructureTypeDelegate2;
import org.eclipse.debug.core.model.IValue;
import com.ibm.icu.text.MessageFormat;
/**
* Proxy to a logical structure type extension.
*
* @see IConfigurationElementConstants
*/
public class LogicalStructureType implements ILogicalStructureType {
private IConfigurationElement fConfigurationElement;
private ILogicalStructureTypeDelegate fDelegate;
private String fModelId;
// whether the 'description' attribute has been verified to exist: it is only
// required when the delegate does *not* implement ILogicalStructureTypeDelegate2.
private boolean fVerifiedDescription = false;
/**
* Constructs a new logical structure type, and verifies required attributes.
*
* @param element configuration element
* @exception CoreException if required attributes are missing
*/
public LogicalStructureType(IConfigurationElement element) throws CoreException {
fConfigurationElement = element;
verifyAttributes();
}
/**
* Verifies required attributes.
*
* @exception CoreException if required attributes are missing
*/
private void verifyAttributes() throws CoreException {
verifyAttributeExists(IConfigurationElementConstants.ID);
verifyAttributeExists(IConfigurationElementConstants.CLASS);
fModelId = fConfigurationElement.getAttribute(IConfigurationElementConstants.MODEL_IDENTIFIER);
if (fModelId == null) {
missingAttribute(IConfigurationElementConstants.MODEL_IDENTIFIER);
}
}
/**
* Verifies the given attribute exists
* @param name the name to verify
*
* @exception CoreException if attribute does not exist
*/
private void verifyAttributeExists(String name) throws CoreException {
if (fConfigurationElement.getAttribute(name) == null) {
missingAttribute(name);
}
}
/**
* Throws a new <code>CoreException</code> about the specified attribute being missing
* @param attrName the name of the missing attribute
* @throws CoreException if a problem is encountered
*/
private void missingAttribute(String attrName) throws CoreException {
throw new CoreException(new Status(IStatus.ERROR, DebugPlugin.getUniqueIdentifier(), DebugPlugin.ERROR, MessageFormat.format(DebugCoreMessages.LogicalStructureType_1, new Object[] { attrName }), null));
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.core.ILogicalStructureType#getDescription()
*/
@Override
public String getDescription() {
return fConfigurationElement.getAttribute(IConfigurationElementConstants.DESCRIPTION);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.core.ILogicalStructureType#getId()
*/
@Override
public String getId() {
return fConfigurationElement.getAttribute(IConfigurationElementConstants.ID);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.core.ILogicalStructureType#getLogicalStructure(org.eclipse.debug.core.model.IValue)
*/
@Override
public IValue getLogicalStructure(IValue value) throws CoreException {
return getDelegate().getLogicalStructure(value);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.core.ILogicalStructureType#providesLogicalStructure(org.eclipse.debug.core.model.IValue)
*/
@Override
public boolean providesLogicalStructure(IValue value) {
if (value.getModelIdentifier().equals(fModelId)) {
return getDelegate().providesLogicalStructure(value);
}
return false;
}
/**
* Returns the <code>ILogicalStructuresTypeDelegate</code> delegate
* @return the delegate
*/
protected ILogicalStructureTypeDelegate getDelegate() {
if (fDelegate == null) {
try {
fDelegate = (ILogicalStructureTypeDelegate) fConfigurationElement.createExecutableExtension(IConfigurationElementConstants.CLASS);
} catch (CoreException e) {
DebugPlugin.log(e);
}
}
return fDelegate;
}
/* (non-Javadoc)
* @see org.eclipse.debug.core.model.ILogicalStructureTypeDelegate2#getDescription(org.eclipse.debug.core.model.IValue)
*/
@Override
public String getDescription(IValue value) {
ILogicalStructureTypeDelegate delegate = getDelegate();
if (delegate instanceof ILogicalStructureTypeDelegate2) {
ILogicalStructureTypeDelegate2 d2 = (ILogicalStructureTypeDelegate2) delegate;
return d2.getDescription(value);
}
if (!fVerifiedDescription) {
fVerifiedDescription = true;
try {
verifyAttributeExists(IConfigurationElementConstants.DESCRIPTION);
} catch (CoreException e) {
DebugPlugin.log(e);
}
}
String description = getDescription();
if (description == null) {
return DebugCoreMessages.LogicalStructureType_0;
}
return description;
}
}
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