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/*******************************************************************************
* Copyright (c) 2000, 2008 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.jface.text.templates;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.TextUtilities;
/**
* A TemplateVariable represents a set of positions into a
* TemplateBuffer with identical content each. TemplateVariableResolvers
* can be used to resolve a template variable to a symbol available from the
* TemplateContext. A resolved variable may have one or more possible
* {@link #getValues() values} which may be presented to the user as choices. If there is no user
* interaction the {@link #getDefaultValue() default value} is chosen as textual representation of
* the variable.
*
* Clients may instantiate and extend this class.
*
*
* @see TemplateVariableResolver
* @see TemplateBuffer
* @since 3.0
*/
public class TemplateVariable {
/** The type name of the variable */
private final TemplateVariableType fType;
/** The name of the variable. */
private final String fName;
/** The initial length in the template pattern. */
private final int fInitialLength;
/** The offsets of the variable. */
private int[] fOffsets;
/** Flag indicating if the variable has been resolved unambiguously. */
private boolean fIsUnambiguous;
/** Flag indicating if the variable has been resolved by a resolver. */
private boolean fIsResolved;
/**
* The proposal strings available for this variable. The first string is
* the default value.
*/
private String[] fValues;
/**
* Creates a template variable. The type is used as the name of the
* variable.
*
* @param type the type of the variable
* @param defaultValue the default value of the variable
* @param offsets the array of offsets of the variable
*/
public TemplateVariable(String type, String defaultValue, int[] offsets) {
this(type, new String[] { defaultValue }, offsets);
}
/**
* Creates a template variable.
*
* @param type the type of the variable
* @param name the name of the variable
* @param defaultValue the default value of the variable
* @param offsets the array of offsets of the variable
*/
public TemplateVariable(String type, String name, String defaultValue, int[] offsets) {
this(type, name, new String[] { defaultValue }, offsets);
}
/**
* Creates a template variable.
*
* @param type the type of the variable
* @param name the name of the variable
* @param defaultValue the default value of the variable
* @param offsets the array of offsets of the variable
* @since 3.3
*/
public TemplateVariable(TemplateVariableType type, String name, String defaultValue, int[] offsets) {
this(type, name, new String[] { defaultValue }, offsets);
}
/**
* Creates a template variable with multiple possible values. The type is
* used as the name of the template.
*
* @param type the type of the template variable
* @param values the values available at this variable, non-empty
* @param offsets the array of offsets of the variable
*/
public TemplateVariable(String type, String[] values, int[] offsets) {
this(type, type, values, offsets);
}
/**
* Creates a template variable with multiple possible values.
*
* @param type the type of the variable
* @param name the name of the variable
* @param values the values available at this variable, non-empty
* @param offsets the array of offsets of the variable
*/
public TemplateVariable(String type, String name, String[] values, int[] offsets) {
this(new TemplateVariableType(type), name, values, offsets);
}
/**
* Creates a template variable with multiple possible values.
*
* @param type the type of the variable
* @param name the name of the variable
* @param values the values available at this variable, non-empty
* @param offsets the array of offsets of the variable
* @since 3.3
*/
TemplateVariable(TemplateVariableType type, String name, String[] values, int[] offsets) {
Assert.isNotNull(type);
Assert.isNotNull(name);
fType= type;
fName= name;
setValues(values);
setOffsets(offsets);
setUnambiguous(false);
setResolved(false);
fInitialLength= values[0].length();
}
/**
* Returns the type name of the variable.
*
* @return the type name of the variable
*/
public String getType() {
return fType.getName();
}
/**
* Returns the type of the variable.
*
* @return the type of the variable
* @since 3.3
*/
public TemplateVariableType getVariableType() {
return fType;
}
/**
* Returns the name of the variable.
*
* @return the name of the variable
*/
public String getName() {
return fName;
}
/**
* Returns the default value of the variable. Typically, this is the first of
* the possible values (see {@link #getValues()}.
*
* @return the default value of the variable
*/
public String getDefaultValue() {
return getValues()[0];
}
/**
* Returns the possible values for this variable. The returned array is owned by this variable
* and must not be modified. The array is not empty.
*
* @return the possible values for this variable
*/
public String[] getValues() {
return fValues;
}
/**
* Returns the length of the variable's default value.
*
* @return the length of the variable
*/
public int getLength() {
return getDefaultValue().length();
}
/**
* Returns the initial length of the variable. The initial length is the lenght as it occurred
* in the template pattern and is used when resolving a template to update the pattern with the
* resolved values of the variable.
*
* @return the initial length of the variable
* @since 3.3
*/
final int getInitialLength() {
return fInitialLength;
}
/**
* Sets the offsets of the variable.
*
* @param offsets the new offsets of the variable
*/
public void setOffsets(int[] offsets) {
fOffsets= TextUtilities.copy(offsets);
}
/**
* Returns the offsets of the variable. The returned array is
* owned by this variable and must not be modified.
*
* @return the length of the variable
*/
public int[] getOffsets() {
return fOffsets;
}
/**
* Resolves the variable to a single value. This is a shortcut for
* setValues(new String[] { value }).
*
* @param value the new default value
*/
public final void setValue(String value) {
setValues(new String[] { value });
}
/**
* Resolves the variable to several possible values for this variable, with the first being the
* default value.
*
* @param values a non-empty array of values
*/
public void setValues(String[] values) {
Assert.isTrue(values.length > 0);
fValues= TextUtilities.copy(values);
setResolved(true);
}
/**
* Sets the isUnambiguous flag of the variable.
*
* @param unambiguous the new unambiguous state of the variable
*/
public void setUnambiguous(boolean unambiguous) {
fIsUnambiguous= unambiguous;
if (unambiguous)
setResolved(true);
}
/**
* Returns true if the variable is unambiguously resolved, false otherwise.
*
* @return true if the variable is unambiguously resolved, false otherwise
*/
public boolean isUnambiguous() {
return fIsUnambiguous;
}
/**
* Sets the resolved flag of the variable.
*
* @param resolved the new resolved state
* @since 3.3
*/
public void setResolved(boolean resolved) {
fIsResolved= resolved;
}
/**
* Returns true if the variable has been resolved, false
* otherwise.
*
* @return true if the variable has been resolved, false otherwise
* @since 3.3
*/
public boolean isResolved() {
return fIsResolved;
}
}