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/*******************************************************************************
* Copyright (c) 2009, 2017 Cloudsmith Inc. 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:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.metadata.expression;
import java.util.*;
import org.eclipse.equinox.p2.metadata.Version;
import org.eclipse.equinox.p2.metadata.VersionRange;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
import org.eclipse.equinox.p2.metadata.expression.SimplePattern;
import org.osgi.framework.Filter;
/**
* An expression that represents a constant value.
*/
public final class Literal extends Expression {
public static final Literal FALSE_CONSTANT = new Literal(Boolean.FALSE);
public static final Literal NULL_CONSTANT = new Literal(null);
public static final Literal TRUE_CONSTANT = new Literal(Boolean.TRUE);
public static Literal create(Object value) {
if (value == null)
return NULL_CONSTANT;
if (value == Boolean.TRUE)
return TRUE_CONSTANT;
if (value == Boolean.FALSE)
return FALSE_CONSTANT;
return new Literal(value);
}
public final Object value;
private Literal(Object value) {
this.value = value;
}
@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public int compareTo(Expression e) {
int cmp = super.compareTo(e);
if (cmp != 0)
return cmp;
Object eValue = ((Literal) e).value;
if (value == null)
return eValue == null ? 0 : -1;
if (eValue == null)
return 1;
if (eValue.getClass() == value.getClass())
return ((Comparable) value).compareTo(eValue);
return eValue.getClass().getName().compareTo(value.getClass().getName());
}
@Override
public boolean equals(Object o) {
if (super.equals(o)) {
Literal bo = (Literal) o;
return value == null ? bo.value == null : value.equals(bo.value);
}
return false;
}
@Override
public Object evaluate(IEvaluationContext context) {
return value;
}
@Override
public int getExpressionType() {
return TYPE_LITERAL;
}
@Override
public String getOperator() {
return "<literal>"; //$NON-NLS-1$
}
@Override
public int getPriority() {
return PRIORITY_LITERAL;
}
@Override
public int hashCode() {
return 31 + value.hashCode();
}
@Override
public void toLDAPString(StringBuffer buf) {
if (!(value instanceof Filter))
throw new UnsupportedOperationException();
buf.append(value.toString());
}
@Override
public void toString(StringBuffer bld, Variable rootVariable) {
appendValue(bld, value);
}
private static void appendValue(StringBuffer bld, Object value) {
if (value == null)
bld.append("null"); //$NON-NLS-1$
else if (value == Boolean.TRUE)
bld.append("true"); //$NON-NLS-1$
else if (value == Boolean.FALSE)
bld.append("false"); //$NON-NLS-1$
else if (value instanceof String)
appendQuotedString(bld, (String) value);
else if (value instanceof Number)
bld.append(value.toString());
else if (value instanceof SimplePattern) {
appendEscaped(bld, '/', value.toString());
} else if (value instanceof Version) {
bld.append("version("); //$NON-NLS-1$
appendQuotedString(bld, value.toString());
bld.append(')');
} else if (value instanceof VersionRange) {
bld.append("range("); //$NON-NLS-1$
appendQuotedString(bld, value.toString());
bld.append(')');
} else if (value instanceof Class<?>) {
bld.append("class("); //$NON-NLS-1$
appendQuotedString(bld, value.toString());
bld.append(')');
} else if (value instanceof Filter) {
bld.append("filter("); //$NON-NLS-1$
appendQuotedString(bld, value.toString());
bld.append(')');
} else if (value instanceof Set<?>) {
bld.append("set("); //$NON-NLS-1$
appendLiteralCollection(bld, (Collection<?>) value);
bld.append(')');
} else if (value instanceof Collection<?>)
appendLiteralCollection(bld, (Collection<?>) value);
else
bld.append(value);
}
private static void appendLiteralCollection(StringBuffer bld, Collection<?> collection) {
bld.append('[');
Iterator<?> iter = collection.iterator();
if (iter.hasNext()) {
appendValue(bld, iter.next());
while (iter.hasNext()) {
bld.append(',');
appendValue(bld, iter.next());
}
}
bld.append(']');
}
private static void appendQuotedString(StringBuffer bld, String str) {
if (str.indexOf('\'') < 0) {
bld.append('\'');
bld.append(str);
bld.append('\'');
} else
appendEscaped(bld, '"', str);
}
private static void appendEscaped(StringBuffer bld, char delimiter, String str) {
bld.append(delimiter);
int top = str.length();
for (int idx = 0; idx < top; ++idx) {
char c = str.charAt(idx);
if (c == delimiter || c == '\\')
bld.append('\\');
bld.append(c);
}
bld.append(delimiter);
}
}
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